mirror of
https://github.com/go-micro/go-micro.git
synced 2025-11-23 21:44:41 +02:00
major docs overhaul
This commit is contained in:
Asim Aslam
44
.github/ISSUE_TEMPLATE/bug_report.md
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44
.github/ISSUE_TEMPLATE/bug_report.md
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@@ -0,0 +1,44 @@
|
||||
---
|
||||
name: Bug report
|
||||
about: Create a report to help us improve
|
||||
title: '[BUG] '
|
||||
labels: bug
|
||||
assignees: ''
|
||||
---
|
||||
|
||||
## Describe the bug
|
||||
A clear and concise description of what the bug is.
|
||||
|
||||
## To Reproduce
|
||||
Steps to reproduce the behavior:
|
||||
1. Create service with '...'
|
||||
2. Configure plugin '...'
|
||||
3. Run command '...'
|
||||
4. See error
|
||||
|
||||
## Expected behavior
|
||||
A clear and concise description of what you expected to happen.
|
||||
|
||||
## Code sample
|
||||
```go
|
||||
// Minimal reproducible code
|
||||
```
|
||||
|
||||
## Environment
|
||||
- Go Micro version: [e.g. v5.3.0]
|
||||
- Go version: [e.g. 1.21.0]
|
||||
- OS: [e.g. Ubuntu 22.04]
|
||||
- Plugins used: [e.g. consul registry, nats broker]
|
||||
|
||||
## Logs
|
||||
```
|
||||
Paste relevant logs here
|
||||
```
|
||||
|
||||
## Additional context
|
||||
Add any other context about the problem here.
|
||||
|
||||
## Resources
|
||||
- [Documentation](https://github.com/micro/go-micro/tree/master/internal/website/docs)
|
||||
- [Examples](https://github.com/micro/go-micro/tree/master/internal/website/docs/examples)
|
||||
- [API Reference](https://pkg.go.dev/go-micro.dev/v5)
|
||||
30
.github/ISSUE_TEMPLATE/feature_request.md
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30
.github/ISSUE_TEMPLATE/feature_request.md
vendored
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@@ -0,0 +1,30 @@
|
||||
---
|
||||
name: Feature request
|
||||
about: Suggest an idea for this project
|
||||
title: '[FEATURE] '
|
||||
labels: enhancement
|
||||
assignees: ''
|
||||
---
|
||||
|
||||
## Is your feature request related to a problem?
|
||||
A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
|
||||
|
||||
## Describe the solution you'd like
|
||||
A clear and concise description of what you want to happen.
|
||||
|
||||
## Describe alternatives you've considered
|
||||
A clear and concise description of any alternative solutions or features you've considered.
|
||||
|
||||
## Use case
|
||||
Describe how this feature would be used in practice. What problem does it solve?
|
||||
|
||||
## Additional context
|
||||
Add any other context, code examples, or screenshots about the feature request here.
|
||||
|
||||
## Willing to contribute?
|
||||
- [ ] I'd be willing to submit a PR for this feature
|
||||
|
||||
## Resources
|
||||
- [Documentation](https://github.com/micro/go-micro/tree/master/internal/website/docs)
|
||||
- [Plugins](https://github.com/micro/go-micro/tree/master/internal/website/docs/plugins.md)
|
||||
- [Roadmap](https://github.com/micro/go-micro/blob/master/ROADMAP.md)
|
||||
31
.github/ISSUE_TEMPLATE/question.md
vendored
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31
.github/ISSUE_TEMPLATE/question.md
vendored
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@@ -0,0 +1,31 @@
|
||||
---
|
||||
name: Question
|
||||
about: Ask a question about using Go Micro
|
||||
title: '[QUESTION] '
|
||||
labels: question
|
||||
assignees: ''
|
||||
---
|
||||
|
||||
## Your question
|
||||
A clear and concise question about Go Micro usage.
|
||||
|
||||
## What have you tried?
|
||||
Describe what you've already attempted or researched.
|
||||
|
||||
## Code sample (if applicable)
|
||||
```go
|
||||
// Your code here
|
||||
```
|
||||
|
||||
## Context
|
||||
Provide any additional context that might help answer your question.
|
||||
|
||||
## Resources you've checked
|
||||
- [ ] [Getting Started Guide](https://github.com/micro/go-micro/tree/master/internal/website/docs/getting-started.md)
|
||||
- [ ] [Examples](https://github.com/micro/go-micro/tree/master/internal/website/docs/examples)
|
||||
- [ ] [API Documentation](https://pkg.go.dev/go-micro.dev/v5)
|
||||
- [ ] Searched existing issues
|
||||
|
||||
## Helpful links
|
||||
- [Documentation](https://github.com/micro/go-micro/tree/master/internal/website/docs)
|
||||
- [Plugins Guide](https://github.com/micro/go-micro/tree/master/internal/website/docs/plugins.md)
|
||||
207
CONTRIBUTING.md
Normal file
207
CONTRIBUTING.md
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@@ -0,0 +1,207 @@
|
||||
# Contributing to Go Micro
|
||||
|
||||
Thank you for your interest in contributing to Go Micro! This document provides guidelines and instructions for contributing.
|
||||
|
||||
## Code of Conduct
|
||||
|
||||
Be respectful, inclusive, and collaborative. We're all here to build great software together.
|
||||
|
||||
## Getting Started
|
||||
|
||||
1. Fork the repository
|
||||
2. Clone your fork: `git clone https://github.com/YOUR_USERNAME/go-micro.git`
|
||||
3. Add upstream remote: `git remote add upstream https://github.com/micro/go-micro.git`
|
||||
4. Create a feature branch: `git checkout -b feature/my-feature`
|
||||
|
||||
## Development Setup
|
||||
|
||||
```bash
|
||||
# Install dependencies
|
||||
go mod download
|
||||
|
||||
# Run tests
|
||||
go test ./...
|
||||
|
||||
# Run tests with coverage
|
||||
go test -race -coverprofile=coverage.out ./...
|
||||
|
||||
# Run linter (install golangci-lint first)
|
||||
golangci-lint run
|
||||
```
|
||||
|
||||
## Making Changes
|
||||
|
||||
### Code Guidelines
|
||||
|
||||
- Follow standard Go conventions (use `gofmt`, `golint`)
|
||||
- Write clear, descriptive commit messages
|
||||
- Add tests for new functionality
|
||||
- Update documentation for API changes
|
||||
- Keep PRs focused - one feature/fix per PR
|
||||
|
||||
### Commit Messages
|
||||
|
||||
Use conventional commits format:
|
||||
|
||||
```
|
||||
type(scope): subject
|
||||
|
||||
body
|
||||
|
||||
footer
|
||||
```
|
||||
|
||||
Types:
|
||||
- `feat`: New feature
|
||||
- `fix`: Bug fix
|
||||
- `docs`: Documentation changes
|
||||
- `test`: Test additions/changes
|
||||
- `refactor`: Code refactoring
|
||||
- `perf`: Performance improvements
|
||||
- `chore`: Maintenance tasks
|
||||
|
||||
Examples:
|
||||
```
|
||||
feat(registry): add kubernetes registry plugin
|
||||
fix(broker): resolve nats connection leak
|
||||
docs(examples): add streaming example
|
||||
```
|
||||
|
||||
### Testing
|
||||
|
||||
- Write unit tests for all new code
|
||||
- Ensure existing tests pass
|
||||
- Add integration tests for plugin implementations
|
||||
- Test with multiple Go versions (1.20+)
|
||||
|
||||
```bash
|
||||
# Run specific package tests
|
||||
go test ./registry/...
|
||||
|
||||
# Run with verbose output
|
||||
go test -v ./...
|
||||
|
||||
# Run specific test
|
||||
go test -run TestMyFunction ./pkg/...
|
||||
```
|
||||
|
||||
### Documentation
|
||||
|
||||
- Update relevant markdown files in `internal/website/docs/`
|
||||
- Add examples to `internal/website/docs/examples/` for new features
|
||||
- Update README.md for major features
|
||||
- Add godoc comments for exported functions/types
|
||||
|
||||
## Pull Request Process
|
||||
|
||||
1. **Update your branch**
|
||||
```bash
|
||||
git fetch upstream
|
||||
git rebase upstream/master
|
||||
```
|
||||
|
||||
2. **Run tests and linting**
|
||||
```bash
|
||||
go test ./...
|
||||
golangci-lint run
|
||||
```
|
||||
|
||||
3. **Push to your fork**
|
||||
```bash
|
||||
git push origin feature/my-feature
|
||||
```
|
||||
|
||||
4. **Create Pull Request**
|
||||
- Use a descriptive title
|
||||
- Reference any related issues
|
||||
- Describe what changed and why
|
||||
- Add screenshots for UI changes
|
||||
- Mark as draft if work in progress
|
||||
|
||||
5. **PR Review**
|
||||
- Respond to feedback promptly
|
||||
- Make requested changes
|
||||
- Re-request review after updates
|
||||
|
||||
### PR Checklist
|
||||
|
||||
- [ ] Tests pass locally
|
||||
- [ ] Code follows Go conventions
|
||||
- [ ] Documentation updated
|
||||
- [ ] Commit messages are clear
|
||||
- [ ] Branch is up to date with master
|
||||
- [ ] No merge conflicts
|
||||
|
||||
## Adding Plugins
|
||||
|
||||
New plugins should:
|
||||
|
||||
1. Live in the appropriate interface directory (e.g., `registry/myplugin/`)
|
||||
2. Implement the interface completely
|
||||
3. Include comprehensive tests
|
||||
4. Provide usage examples
|
||||
5. Document configuration options (env vars, options)
|
||||
6. Add to plugin documentation
|
||||
|
||||
Example structure:
|
||||
```
|
||||
registry/myplugin/
|
||||
├── myplugin.go # Main implementation
|
||||
├── myplugin_test.go # Tests
|
||||
├── options.go # Plugin-specific options
|
||||
└── README.md # Usage and configuration
|
||||
```
|
||||
|
||||
## Reporting Issues
|
||||
|
||||
Before creating an issue:
|
||||
|
||||
1. Search existing issues
|
||||
2. Check documentation
|
||||
3. Try the latest version
|
||||
|
||||
When reporting bugs:
|
||||
- Use the bug report template
|
||||
- Include minimal reproduction code
|
||||
- Specify versions (Go, Go Micro, plugins)
|
||||
- Provide relevant logs
|
||||
|
||||
## Documentation Contributions
|
||||
|
||||
Documentation improvements are always welcome!
|
||||
|
||||
- Fix typos and grammar
|
||||
- Improve clarity
|
||||
- Add missing examples
|
||||
- Update outdated information
|
||||
|
||||
Documentation lives in `internal/website/docs/`. Preview locally with Jekyll:
|
||||
|
||||
```bash
|
||||
cd internal/website
|
||||
bundle install
|
||||
bundle exec jekyll serve --livereload
|
||||
```
|
||||
|
||||
## Community
|
||||
|
||||
- GitHub Issues: Bug reports and feature requests
|
||||
- GitHub Discussions: Questions, ideas, and community chat
|
||||
- Sponsorship: [GitHub Sponsors](https://github.com/sponsors/micro)
|
||||
|
||||
## Release Process
|
||||
|
||||
Maintainers handle releases:
|
||||
|
||||
1. Update CHANGELOG.md
|
||||
2. Tag release: `git tag -a v5.x.x -m "Release v5.x.x"`
|
||||
3. Push tag: `git push origin v5.x.x`
|
||||
4. GitHub Actions creates release
|
||||
|
||||
## Questions?
|
||||
|
||||
- Check [documentation](internal/website/docs/)
|
||||
- Browse [examples](internal/website/docs/examples/)
|
||||
- Open a [question issue](.github/ISSUE_TEMPLATE/question.md)
|
||||
|
||||
Thank you for contributing to Go Micro! 🎉
|
||||
163
ROADMAP.md
Normal file
163
ROADMAP.md
Normal file
@@ -0,0 +1,163 @@
|
||||
# Go Micro Roadmap
|
||||
|
||||
This roadmap outlines the planned features and improvements for Go Micro. Community feedback and contributions are welcome!
|
||||
|
||||
## Current Focus (Q1 2026)
|
||||
|
||||
### Documentation & Developer Experience
|
||||
- [x] Modernize documentation structure
|
||||
- [x] Add learn-by-example guides
|
||||
- [x] Update issue templates
|
||||
- [ ] Create video tutorials
|
||||
- [ ] Interactive documentation site
|
||||
- [ ] Plugin discovery dashboard
|
||||
|
||||
### Observability
|
||||
- [ ] OpenTelemetry native support
|
||||
- [ ] Auto-instrumentation for handlers
|
||||
- [ ] Metrics export standardization
|
||||
- [ ] Distributed tracing examples
|
||||
- [ ] Integration with popular observability platforms
|
||||
|
||||
### Developer Tools
|
||||
- [ ] `micro dev` with hot reload
|
||||
- [ ] Service templates (`micro new --template`)
|
||||
- [ ] Better error messages with suggestions
|
||||
- [ ] Debug tooling improvements
|
||||
- [ ] VS Code extension for Go Micro
|
||||
|
||||
## Q2 2026
|
||||
|
||||
### Production Readiness
|
||||
- [ ] Health check standardization
|
||||
- [ ] Graceful shutdown improvements
|
||||
- [ ] Resource cleanup best practices
|
||||
- [ ] Load testing framework integration
|
||||
- [ ] Performance benchmarking suite
|
||||
|
||||
### Cloud Native
|
||||
- [ ] Kubernetes operator
|
||||
- [ ] Helm charts for common setups
|
||||
- [ ] Service mesh integration guides (Istio, Linkerd)
|
||||
- [ ] Cloud provider quickstarts (AWS, GCP, Azure)
|
||||
- [ ] Multi-cluster patterns
|
||||
|
||||
### Security
|
||||
- [ ] mTLS by default option
|
||||
- [ ] Secret management integration (Vault, AWS Secrets Manager)
|
||||
- [ ] RBAC improvements
|
||||
- [ ] Security audit and hardening
|
||||
- [ ] CVE scanning and response process
|
||||
|
||||
## Q3 2026
|
||||
|
||||
### Plugin Ecosystem
|
||||
- [ ] Plugin marketplace/registry
|
||||
- [ ] Plugin quality standards
|
||||
- [ ] Community plugin contributions
|
||||
- [ ] Plugin compatibility matrix
|
||||
- [ ] Auto-discovery of available plugins
|
||||
|
||||
### Streaming & Async
|
||||
- [ ] Improved streaming support
|
||||
- [ ] Server-sent events (SSE) support
|
||||
- [ ] WebSocket plugin
|
||||
- [ ] Event sourcing patterns
|
||||
- [ ] CQRS examples
|
||||
|
||||
### Testing
|
||||
- [ ] Mock generation tooling
|
||||
- [ ] Integration test helpers
|
||||
- [ ] Contract testing support
|
||||
- [ ] Chaos engineering examples
|
||||
- [ ] E2E testing framework
|
||||
|
||||
## Q4 2026
|
||||
|
||||
### Performance
|
||||
- [ ] Connection pooling optimizations
|
||||
- [ ] Zero-allocation paths
|
||||
- [ ] gRPC performance improvements
|
||||
- [ ] Caching strategies guide
|
||||
- [ ] Performance profiling tools
|
||||
|
||||
### Developer Productivity
|
||||
- [ ] Code generation improvements
|
||||
- [ ] Better IDE support
|
||||
- [ ] Debugging tools
|
||||
- [ ] Migration automation tools
|
||||
- [ ] Upgrade helpers
|
||||
|
||||
### Community
|
||||
- [ ] Regular blog posts and case studies
|
||||
- [ ] Community spotlight program
|
||||
- [ ] Contribution rewards
|
||||
- [ ] Monthly community calls
|
||||
- [ ] Conference presence
|
||||
|
||||
## Long-term Vision
|
||||
|
||||
### Core Framework
|
||||
- Maintain backward compatibility (Go Micro v5+)
|
||||
- Progressive disclosure of complexity
|
||||
- Best-in-class developer experience
|
||||
- Production-grade reliability
|
||||
- Comprehensive plugin ecosystem
|
||||
|
||||
### Ecosystem Goals
|
||||
- 100+ production deployments documented
|
||||
- 50+ community plugins
|
||||
- Active contributor community
|
||||
- Regular releases (monthly patches, quarterly features)
|
||||
- Comprehensive benchmarks vs alternatives
|
||||
|
||||
### Differentiation
|
||||
- **Batteries included, fully swappable** - Start simple, scale complex
|
||||
- **Zero-config local development** - No infrastructure required to start
|
||||
- **Plugin ecosystem in-repo** - No version compatibility hell
|
||||
- **Progressive complexity** - Learn as you grow
|
||||
- **Cloud-native first** - Built for Kubernetes and containers
|
||||
|
||||
## Contributing
|
||||
|
||||
We welcome contributions to any roadmap items! See [CONTRIBUTING.md](CONTRIBUTING.md) for guidelines.
|
||||
|
||||
### High Priority Areas
|
||||
1. Documentation improvements
|
||||
2. Real-world examples
|
||||
3. Plugin development
|
||||
4. Performance optimizations
|
||||
5. Testing infrastructure
|
||||
|
||||
### How to Contribute
|
||||
- Pick an item from the roadmap
|
||||
- Open an issue to discuss approach
|
||||
- Submit a PR with implementation
|
||||
- Help review others' contributions
|
||||
|
||||
## Feedback
|
||||
|
||||
Have suggestions for the roadmap?
|
||||
|
||||
- Open a [feature request](.github/ISSUE_TEMPLATE/feature_request.md)
|
||||
- Start a discussion in GitHub Discussions
|
||||
- Comment on existing roadmap issues
|
||||
|
||||
## Version Compatibility
|
||||
|
||||
We follow semantic versioning:
|
||||
- Major versions (v5 → v6): Breaking changes
|
||||
- Minor versions (v5.3 → v5.4): New features, backward compatible
|
||||
- Patch versions (v5.3.0 → v5.3.1): Bug fixes, no API changes
|
||||
|
||||
## Support Timeline
|
||||
|
||||
- v5: Active development (current)
|
||||
- v4: Security fixes only (until v6 release)
|
||||
- v3: End of life
|
||||
|
||||
---
|
||||
|
||||
Last updated: November 2025
|
||||
|
||||
This roadmap is subject to change based on community needs and priorities. Star the repo to stay updated! ⭐
|
||||
@@ -0,0 +1,90 @@
|
||||
---
|
||||
layout: default
|
||||
---
|
||||
|
||||
# ADR-001: Plugin Architecture
|
||||
|
||||
## Status
|
||||
**Accepted**
|
||||
|
||||
## Context
|
||||
|
||||
Microservices frameworks need to support multiple infrastructure backends (registries, brokers, transports, stores). Different teams have different preferences and existing infrastructure.
|
||||
|
||||
Hard-coding specific implementations:
|
||||
- Limits framework adoption
|
||||
- Forces migration of existing infrastructure
|
||||
- Prevents innovation and experimentation
|
||||
|
||||
## Decision
|
||||
|
||||
Go Micro uses a **pluggable architecture** where:
|
||||
|
||||
1. Core interfaces define contracts (Registry, Broker, Transport, Store, etc.)
|
||||
2. Multiple implementations live in the same repository under interface directories
|
||||
3. Plugins are imported directly and passed via options
|
||||
4. Default implementations work without any infrastructure
|
||||
|
||||
## Structure
|
||||
|
||||
```
|
||||
go-micro/
|
||||
├── registry/ # Interface definition
|
||||
│ ├── registry.go
|
||||
│ ├── mdns.go # Default implementation
|
||||
│ ├── consul/ # Plugin
|
||||
│ ├── etcd/ # Plugin
|
||||
│ └── nats/ # Plugin
|
||||
├── broker/
|
||||
├── transport/
|
||||
└── store/
|
||||
```
|
||||
|
||||
## Consequences
|
||||
|
||||
### Positive
|
||||
|
||||
- **No version hell**: Plugins versioned with core framework
|
||||
- **Discovery**: Users browse available plugins in same repo
|
||||
- **Consistency**: All plugins follow same patterns
|
||||
- **Testing**: Plugins tested together
|
||||
- **Zero config**: Default implementations require no setup
|
||||
|
||||
### Negative
|
||||
|
||||
- **Repo size**: More code in one repository
|
||||
- **Plugin maintenance**: Core team responsible for plugin quality
|
||||
- **Breaking changes**: Harder to evolve individual plugins independently
|
||||
|
||||
### Neutral
|
||||
|
||||
- Plugins can be extracted to separate repos if they grow complex
|
||||
- Community can contribute plugins via PR
|
||||
- Plugin-specific issues easier to triage
|
||||
|
||||
## Alternatives Considered
|
||||
|
||||
### Separate Plugin Repositories
|
||||
Used by go-kit and other frameworks. Rejected because:
|
||||
- Version compatibility becomes user's problem
|
||||
- Discovery requires documentation
|
||||
- Testing integration harder
|
||||
- Splitting community
|
||||
|
||||
### Single Implementation
|
||||
Like standard `net/http`. Rejected because:
|
||||
- Forces infrastructure choices
|
||||
- Limits adoption
|
||||
- Can't leverage existing infrastructure
|
||||
|
||||
### Dynamic Plugin Loading
|
||||
Using Go plugins or external processes. Rejected because:
|
||||
- Complexity for users
|
||||
- Compatibility issues
|
||||
- Performance overhead
|
||||
- Debugging difficulty
|
||||
|
||||
## Related
|
||||
|
||||
- ADR-002: Interface-First Design (planned)
|
||||
- ADR-005: Registry Plugin Scope (planned)
|
||||
@@ -0,0 +1,120 @@
|
||||
---
|
||||
layout: default
|
||||
---
|
||||
|
||||
# ADR-004: mDNS as Default Registry
|
||||
|
||||
## Status
|
||||
**Accepted**
|
||||
|
||||
## Context
|
||||
|
||||
Service discovery is critical for microservices. Common approaches:
|
||||
|
||||
1. **Central registry** (Consul, Etcd) - Requires infrastructure
|
||||
2. **DNS-based** (Kubernetes DNS) - Platform-specific
|
||||
3. **Static configuration** - Doesn't scale
|
||||
4. **Multicast DNS (mDNS)** - Zero-config, local network
|
||||
|
||||
For local development and getting started, requiring infrastructure setup is a barrier. Production deployments typically have existing service discovery infrastructure.
|
||||
|
||||
## Decision
|
||||
|
||||
Use **mDNS as the default registry** for service discovery.
|
||||
|
||||
- Works immediately on local networks
|
||||
- No external dependencies
|
||||
- Suitable for development and simple deployments
|
||||
- Easily swapped for production registries (Consul, Etcd, Kubernetes)
|
||||
|
||||
## Implementation
|
||||
|
||||
```go
|
||||
// Default - uses mDNS automatically
|
||||
svc := micro.NewService(micro.Name("myservice"))
|
||||
|
||||
// Production - swap to Consul
|
||||
reg := consul.NewConsulRegistry()
|
||||
svc := micro.NewService(
|
||||
micro.Name("myservice"),
|
||||
micro.Registry(reg),
|
||||
)
|
||||
```
|
||||
|
||||
## Consequences
|
||||
|
||||
### Positive
|
||||
|
||||
- **Zero setup**: `go run main.go` just works
|
||||
- **Fast iteration**: No infrastructure for local dev
|
||||
- **Learning curve**: Newcomers start immediately
|
||||
- **Progressive complexity**: Add infrastructure as needed
|
||||
|
||||
### Negative
|
||||
|
||||
- **Local network only**: mDNS doesn't cross subnets/VLANs
|
||||
- **Not for production**: Needs proper registry in production
|
||||
- **Port 5353**: May conflict with existing mDNS services
|
||||
- **Discovery delay**: Can take 1-2 seconds
|
||||
|
||||
### Mitigations
|
||||
|
||||
- Clear documentation on production alternatives
|
||||
- Environment variables for easy swapping (`MICRO_REGISTRY=consul`)
|
||||
- Examples for all major registries
|
||||
- Health checks and readiness probes for production
|
||||
|
||||
## Use Cases
|
||||
|
||||
### Good for mDNS
|
||||
- Local development
|
||||
- Testing
|
||||
- Simple internal services on same network
|
||||
- Learning and prototyping
|
||||
|
||||
### Need Production Registry
|
||||
- Cross-datacenter communication
|
||||
- Cloud deployments
|
||||
- Large service mesh (100+ services)
|
||||
- Require advanced features (health checks, metadata filtering)
|
||||
|
||||
## Alternatives Considered
|
||||
|
||||
### No Default (Force Configuration)
|
||||
Rejected because:
|
||||
- Poor first-run experience
|
||||
- Increases barrier to entry
|
||||
- Users must setup infrastructure before trying framework
|
||||
|
||||
### Static Configuration
|
||||
Rejected because:
|
||||
- Doesn't support dynamic service discovery
|
||||
- Manual configuration doesn't scale
|
||||
- Doesn't reflect real microservices usage
|
||||
|
||||
### Consul as Default
|
||||
Rejected because:
|
||||
- Requires running Consul for "Hello World"
|
||||
- Platform-specific
|
||||
- Adds complexity for beginners
|
||||
|
||||
## Migration Path
|
||||
|
||||
Start with mDNS, migrate to production registry:
|
||||
|
||||
```bash
|
||||
# Development
|
||||
go run main.go
|
||||
|
||||
# Staging
|
||||
MICRO_REGISTRY=consul MICRO_REGISTRY_ADDRESS=consul:8500 go run main.go
|
||||
|
||||
# Production (Kubernetes)
|
||||
MICRO_REGISTRY=nats MICRO_REGISTRY_ADDRESS=nats://nats:4222 ./service
|
||||
```
|
||||
|
||||
## Related
|
||||
|
||||
- [ADR-001: Plugin Architecture](adr-001-plugin-architecture.md)
|
||||
- [ADR-009: Progressive Configuration](adr-009-progressive-configuration.md)
|
||||
- [Registry Documentation](../registry.md)
|
||||
@@ -0,0 +1,152 @@
|
||||
---
|
||||
layout: default
|
||||
---
|
||||
|
||||
# ADR-009: Progressive Configuration
|
||||
|
||||
## Status
|
||||
**Accepted**
|
||||
|
||||
## Context
|
||||
|
||||
Microservices frameworks face a paradox:
|
||||
- Beginners want "Hello World" to work immediately
|
||||
- Production needs sophisticated configuration
|
||||
|
||||
Too simple: Framework is toy, not production-ready
|
||||
Too complex: High barrier to entry, discourages adoption
|
||||
|
||||
## Decision
|
||||
|
||||
Implement **progressive configuration** where:
|
||||
|
||||
1. **Zero config** works for development
|
||||
2. **Environment variables** provide simple overrides
|
||||
3. **Code-based options** enable fine-grained control
|
||||
4. **Defaults are production-aware** but not production-ready
|
||||
|
||||
## Levels of Configuration
|
||||
|
||||
### Level 1: Zero Config (Development)
|
||||
```go
|
||||
svc := micro.NewService(micro.Name("hello"))
|
||||
svc.Run()
|
||||
```
|
||||
|
||||
Uses defaults:
|
||||
- mDNS registry (local)
|
||||
- HTTP transport
|
||||
- Random available port
|
||||
- Memory broker/store
|
||||
|
||||
### Level 2: Environment Variables (Staging)
|
||||
```bash
|
||||
MICRO_REGISTRY=consul \
|
||||
MICRO_REGISTRY_ADDRESS=consul:8500 \
|
||||
MICRO_BROKER=nats \
|
||||
MICRO_BROKER_ADDRESS=nats://nats:4222 \
|
||||
./service
|
||||
```
|
||||
|
||||
No code changes, works with CLI flags.
|
||||
|
||||
### Level 3: Code Options (Production)
|
||||
```go
|
||||
reg := consul.NewConsulRegistry(
|
||||
registry.Addrs("consul1:8500", "consul2:8500"),
|
||||
registry.TLSConfig(tlsConf),
|
||||
)
|
||||
|
||||
b := nats.NewNatsBroker(
|
||||
broker.Addrs("nats://nats1:4222", "nats://nats2:4222"),
|
||||
nats.DrainConnection(),
|
||||
)
|
||||
|
||||
svc := micro.NewService(
|
||||
micro.Name("myservice"),
|
||||
micro.Version("1.2.3"),
|
||||
micro.Registry(reg),
|
||||
micro.Broker(b),
|
||||
micro.Address(":8080"),
|
||||
)
|
||||
```
|
||||
|
||||
Full control over initialization and configuration.
|
||||
|
||||
### Level 4: External Config (Enterprise)
|
||||
```go
|
||||
cfg := config.NewConfig(
|
||||
config.Source(file.NewSource("config.yaml")),
|
||||
config.Source(env.NewSource()),
|
||||
config.Source(vault.NewSource()),
|
||||
)
|
||||
|
||||
// Use cfg to initialize plugins with complex configs
|
||||
```
|
||||
|
||||
## Environment Variable Patterns
|
||||
|
||||
Standard vars for all plugins:
|
||||
```bash
|
||||
MICRO_REGISTRY=<type> # consul, etcd, nats, mdns
|
||||
MICRO_REGISTRY_ADDRESS=<addrs> # Comma-separated
|
||||
MICRO_BROKER=<type>
|
||||
MICRO_BROKER_ADDRESS=<addrs>
|
||||
MICRO_TRANSPORT=<type>
|
||||
MICRO_TRANSPORT_ADDRESS=<addrs>
|
||||
MICRO_STORE=<type>
|
||||
MICRO_STORE_ADDRESS=<addrs>
|
||||
MICRO_STORE_DATABASE=<name>
|
||||
MICRO_STORE_TABLE=<name>
|
||||
```
|
||||
|
||||
Plugin-specific vars:
|
||||
```bash
|
||||
ETCD_USERNAME=user
|
||||
ETCD_PASSWORD=pass
|
||||
CONSUL_TOKEN=secret
|
||||
```
|
||||
|
||||
## Consequences
|
||||
|
||||
### Positive
|
||||
|
||||
- **Fast start**: Beginners productive immediately
|
||||
- **Easy deployment**: Env vars for different environments
|
||||
- **Power when needed**: Full programmatic control available
|
||||
- **Learn incrementally**: Complexity introduced as required
|
||||
|
||||
### Negative
|
||||
|
||||
- **Three config sources**: Environment, code, and CLI flags can conflict
|
||||
- **Documentation**: Must explain all levels clearly
|
||||
- **Testing**: Need to test all configuration methods
|
||||
|
||||
### Mitigations
|
||||
|
||||
- Clear precedence: Code options > Environment > Defaults
|
||||
- Comprehensive examples for each level
|
||||
- Validation and helpful error messages
|
||||
|
||||
## Validation Example
|
||||
|
||||
```go
|
||||
func (s *service) Init() error {
|
||||
if s.opts.Name == "" {
|
||||
return errors.New("service name required")
|
||||
}
|
||||
|
||||
// Warn about development defaults in production
|
||||
if isProduction() && usingDefaults() {
|
||||
log.Warn("Using development defaults in production")
|
||||
}
|
||||
|
||||
return nil
|
||||
}
|
||||
```
|
||||
|
||||
## Related
|
||||
|
||||
- [ADR-004: mDNS as Default Registry](adr-004-mdns-default-registry.md)
|
||||
- ADR-008: Environment Variable Support (planned)
|
||||
- [Getting Started Guide](../getting-started.md) - Configuration examples
|
||||
53
internal/website/docs/architecture/index.md
Normal file
53
internal/website/docs/architecture/index.md
Normal file
@@ -0,0 +1,53 @@
|
||||
---
|
||||
layout: default
|
||||
---
|
||||
|
||||
# Architecture Decision Records
|
||||
|
||||
Documentation of architectural decisions made in Go Micro, following the ADR pattern.
|
||||
|
||||
## What are ADRs?
|
||||
|
||||
Architecture Decision Records (ADRs) capture important architectural decisions along with their context and consequences. They help understand why certain design choices were made.
|
||||
|
||||
## Index
|
||||
|
||||
### Available
|
||||
- [ADR-001: Plugin Architecture](adr-001-plugin-architecture.md)
|
||||
- [ADR-004: mDNS as Default Registry](adr-004-mdns-default-registry.md)
|
||||
- [ADR-009: Progressive Configuration](adr-009-progressive-configuration.md)
|
||||
|
||||
### Planned
|
||||
|
||||
**Core Design**
|
||||
- ADR-002: Interface-First Design
|
||||
- ADR-003: Default Implementations
|
||||
|
||||
**Service Discovery**
|
||||
- ADR-005: Registry Plugin Scope
|
||||
|
||||
**Communication**
|
||||
- ADR-006: HTTP as Default Transport
|
||||
- ADR-007: Content-Type Based Codecs
|
||||
|
||||
**Configuration**
|
||||
- ADR-008: Environment Variable Support
|
||||
|
||||
## Status Values
|
||||
|
||||
- **Proposed**: Under consideration
|
||||
- **Accepted**: Decision approved
|
||||
- **Deprecated**: No longer recommended
|
||||
- **Superseded**: Replaced by another ADR
|
||||
|
||||
## Contributing
|
||||
|
||||
To propose a new ADR:
|
||||
|
||||
1. Number it sequentially (check existing ADRs)
|
||||
2. Follow the structure of existing ADRs
|
||||
3. Include: Status, Context, Decision, Consequences, Alternatives
|
||||
4. Submit a PR for discussion
|
||||
5. Update status based on review
|
||||
|
||||
ADRs are immutable once accepted. To change a decision, create a new ADR that supersedes the old one.
|
||||
390
internal/website/docs/examples/realworld/api-gateway.md
Normal file
390
internal/website/docs/examples/realworld/api-gateway.md
Normal file
@@ -0,0 +1,390 @@
|
||||
---
|
||||
layout: default
|
||||
---
|
||||
|
||||
# API Gateway with Backend Services
|
||||
|
||||
A complete example showing an API gateway routing to multiple backend microservices.
|
||||
|
||||
## Architecture
|
||||
|
||||
```
|
||||
┌─────────────┐
|
||||
Client ───────>│ API Gateway │
|
||||
└──────┬──────┘
|
||||
│
|
||||
┌──────────────┼──────────────┐
|
||||
│ │ │
|
||||
┌─────▼────┐ ┌────▼─────┐ ┌────▼─────┐
|
||||
│ Users │ │ Orders │ │ Products │
|
||||
│ Service │ │ Service │ │ Service │
|
||||
└──────────┘ └──────────┘ └──────────┘
|
||||
│ │ │
|
||||
└──────────────┼──────────────┘
|
||||
│
|
||||
┌──────▼──────┐
|
||||
│ PostgreSQL │
|
||||
└─────────────┘
|
||||
```
|
||||
|
||||
## Services
|
||||
|
||||
### 1. Users Service
|
||||
|
||||
```go
|
||||
// services/users/main.go
|
||||
package main
|
||||
|
||||
import (
|
||||
"context"
|
||||
"database/sql"
|
||||
"go-micro.dev/v5"
|
||||
"go-micro.dev/v5/server"
|
||||
_ "github.com/lib/pq"
|
||||
)
|
||||
|
||||
type User struct {
|
||||
ID int64 `json:"id"`
|
||||
Email string `json:"email"`
|
||||
Name string `json:"name"`
|
||||
}
|
||||
|
||||
type UsersService struct {
|
||||
db *sql.DB
|
||||
}
|
||||
|
||||
type GetUserRequest struct {
|
||||
ID int64 `json:"id"`
|
||||
}
|
||||
|
||||
type GetUserResponse struct {
|
||||
User *User `json:"user"`
|
||||
}
|
||||
|
||||
func (s *UsersService) Get(ctx context.Context, req *GetUserRequest, rsp *GetUserResponse) error {
|
||||
var u User
|
||||
err := s.db.QueryRow("SELECT id, email, name FROM users WHERE id = $1", req.ID).
|
||||
Scan(&u.ID, &u.Email, &u.Name)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
rsp.User = &u
|
||||
return nil
|
||||
}
|
||||
|
||||
func main() {
|
||||
db, err := sql.Open("postgres", "postgres://user:pass@localhost/users?sslmode=disable")
|
||||
if err != nil {
|
||||
panic(err)
|
||||
}
|
||||
defer db.Close()
|
||||
|
||||
svc := micro.NewService(
|
||||
micro.Name("users"),
|
||||
micro.Version("1.0.0"),
|
||||
)
|
||||
|
||||
svc.Init()
|
||||
|
||||
server.RegisterHandler(svc.Server(), &UsersService{db: db})
|
||||
|
||||
if err := svc.Run(); err != nil {
|
||||
panic(err)
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
### 2. Orders Service
|
||||
|
||||
```go
|
||||
// services/orders/main.go
|
||||
package main
|
||||
|
||||
import (
|
||||
"context"
|
||||
"database/sql"
|
||||
"time"
|
||||
"go-micro.dev/v5"
|
||||
"go-micro.dev/v5/client"
|
||||
"go-micro.dev/v5/server"
|
||||
)
|
||||
|
||||
type Order struct {
|
||||
ID int64 `json:"id"`
|
||||
UserID int64 `json:"user_id"`
|
||||
ProductID int64 `json:"product_id"`
|
||||
Amount float64 `json:"amount"`
|
||||
Status string `json:"status"`
|
||||
CreatedAt time.Time `json:"created_at"`
|
||||
}
|
||||
|
||||
type OrdersService struct {
|
||||
db *sql.DB
|
||||
client client.Client
|
||||
}
|
||||
|
||||
type CreateOrderRequest struct {
|
||||
UserID int64 `json:"user_id"`
|
||||
ProductID int64 `json:"product_id"`
|
||||
Amount float64 `json:"amount"`
|
||||
}
|
||||
|
||||
type CreateOrderResponse struct {
|
||||
Order *Order `json:"order"`
|
||||
}
|
||||
|
||||
func (s *OrdersService) Create(ctx context.Context, req *CreateOrderRequest, rsp *CreateOrderResponse) error {
|
||||
// Verify user exists
|
||||
userReq := s.client.NewRequest("users", "UsersService.Get", &struct{ ID int64 }{ID: req.UserID})
|
||||
userRsp := &struct{ User interface{} }{}
|
||||
if err := s.client.Call(ctx, userReq, userRsp); err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
// Verify product exists
|
||||
prodReq := s.client.NewRequest("products", "ProductsService.Get", &struct{ ID int64 }{ID: req.ProductID})
|
||||
prodRsp := &struct{ Product interface{} }{}
|
||||
if err := s.client.Call(ctx, prodReq, prodRsp); err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
// Create order
|
||||
var o Order
|
||||
err := s.db.QueryRow(`
|
||||
INSERT INTO orders (user_id, product_id, amount, status, created_at)
|
||||
VALUES ($1, $2, $3, $4, $5)
|
||||
RETURNING id, user_id, product_id, amount, status, created_at
|
||||
`, req.UserID, req.ProductID, req.Amount, "pending", time.Now()).
|
||||
Scan(&o.ID, &o.UserID, &o.ProductID, &o.Amount, &o.Status, &o.CreatedAt)
|
||||
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
rsp.Order = &o
|
||||
return nil
|
||||
}
|
||||
|
||||
func main() {
|
||||
db, err := sql.Open("postgres", "postgres://user:pass@localhost/orders?sslmode=disable")
|
||||
if err != nil {
|
||||
panic(err)
|
||||
}
|
||||
defer db.Close()
|
||||
|
||||
svc := micro.NewService(
|
||||
micro.Name("orders"),
|
||||
micro.Version("1.0.0"),
|
||||
)
|
||||
|
||||
svc.Init()
|
||||
|
||||
server.RegisterHandler(svc.Server(), &OrdersService{
|
||||
db: db,
|
||||
client: svc.Client(),
|
||||
})
|
||||
|
||||
if err := svc.Run(); err != nil {
|
||||
panic(err)
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
### 3. API Gateway
|
||||
|
||||
```go
|
||||
// gateway/main.go
|
||||
package main
|
||||
|
||||
import (
|
||||
"encoding/json"
|
||||
"net/http"
|
||||
"strconv"
|
||||
"go-micro.dev/v5"
|
||||
"go-micro.dev/v5/client"
|
||||
)
|
||||
|
||||
type Gateway struct {
|
||||
client client.Client
|
||||
}
|
||||
|
||||
func (g *Gateway) GetUser(w http.ResponseWriter, r *http.Request) {
|
||||
idStr := r.URL.Query().Get("id")
|
||||
id, err := strconv.ParseInt(idStr, 10, 64)
|
||||
if err != nil {
|
||||
http.Error(w, "invalid id", http.StatusBadRequest)
|
||||
return
|
||||
}
|
||||
|
||||
req := g.client.NewRequest("users", "UsersService.Get", &struct{ ID int64 }{ID: id})
|
||||
rsp := &struct{ User interface{} }{}
|
||||
|
||||
if err := g.client.Call(r.Context(), req, rsp); err != nil {
|
||||
http.Error(w, err.Error(), http.StatusInternalServerError)
|
||||
return
|
||||
}
|
||||
|
||||
w.Header().Set("Content-Type", "application/json")
|
||||
json.NewEncoder(w).Encode(rsp)
|
||||
}
|
||||
|
||||
func (g *Gateway) CreateOrder(w http.ResponseWriter, r *http.Request) {
|
||||
var body struct {
|
||||
UserID int64 `json:"user_id"`
|
||||
ProductID int64 `json:"product_id"`
|
||||
Amount float64 `json:"amount"`
|
||||
}
|
||||
|
||||
if err := json.NewDecoder(r.Body).Decode(&body); err != nil {
|
||||
http.Error(w, "invalid request", http.StatusBadRequest)
|
||||
return
|
||||
}
|
||||
|
||||
req := g.client.NewRequest("orders", "OrdersService.Create", body)
|
||||
rsp := &struct{ Order interface{} }{}
|
||||
|
||||
if err := g.client.Call(r.Context(), req, rsp); err != nil {
|
||||
http.Error(w, err.Error(), http.StatusInternalServerError)
|
||||
return
|
||||
}
|
||||
|
||||
w.Header().Set("Content-Type", "application/json")
|
||||
w.WriteHeader(http.StatusCreated)
|
||||
json.NewEncoder(w).Encode(rsp)
|
||||
}
|
||||
|
||||
func main() {
|
||||
svc := micro.NewService(
|
||||
micro.Name("api.gateway"),
|
||||
)
|
||||
svc.Init()
|
||||
|
||||
gw := &Gateway{client: svc.Client()}
|
||||
|
||||
http.HandleFunc("/users", gw.GetUser)
|
||||
http.HandleFunc("/orders", gw.CreateOrder)
|
||||
|
||||
http.ListenAndServe(":8080", nil)
|
||||
}
|
||||
```
|
||||
|
||||
## Running the Example
|
||||
|
||||
### Development (Local)
|
||||
|
||||
```bash
|
||||
# Terminal 1: Users service
|
||||
cd services/users
|
||||
go run main.go
|
||||
|
||||
# Terminal 2: Products service
|
||||
cd services/products
|
||||
go run main.go
|
||||
|
||||
# Terminal 3: Orders service
|
||||
cd services/orders
|
||||
go run main.go
|
||||
|
||||
# Terminal 4: API Gateway
|
||||
cd gateway
|
||||
go run main.go
|
||||
```
|
||||
|
||||
### Testing
|
||||
|
||||
```bash
|
||||
# Get user
|
||||
curl http://localhost:8080/users?id=1
|
||||
|
||||
# Create order
|
||||
curl -X POST http://localhost:8080/orders \
|
||||
-H 'Content-Type: application/json' \
|
||||
-d '{"user_id": 1, "product_id": 100, "amount": 99.99}'
|
||||
```
|
||||
|
||||
### Docker Compose
|
||||
|
||||
```yaml
|
||||
version: '3.8'
|
||||
|
||||
services:
|
||||
postgres:
|
||||
image: postgres:15
|
||||
environment:
|
||||
POSTGRES_PASSWORD: secret
|
||||
ports:
|
||||
- "5432:5432"
|
||||
|
||||
users:
|
||||
build: ./services/users
|
||||
environment:
|
||||
MICRO_REGISTRY: nats
|
||||
MICRO_REGISTRY_ADDRESS: nats://nats:4222
|
||||
DATABASE_URL: postgres://postgres:secret@postgres/users
|
||||
depends_on:
|
||||
- postgres
|
||||
- nats
|
||||
|
||||
products:
|
||||
build: ./services/products
|
||||
environment:
|
||||
MICRO_REGISTRY: nats
|
||||
MICRO_REGISTRY_ADDRESS: nats://nats:4222
|
||||
DATABASE_URL: postgres://postgres:secret@postgres/products
|
||||
depends_on:
|
||||
- postgres
|
||||
- nats
|
||||
|
||||
orders:
|
||||
build: ./services/orders
|
||||
environment:
|
||||
MICRO_REGISTRY: nats
|
||||
MICRO_REGISTRY_ADDRESS: nats://nats:4222
|
||||
DATABASE_URL: postgres://postgres:secret@postgres/orders
|
||||
depends_on:
|
||||
- postgres
|
||||
- nats
|
||||
|
||||
gateway:
|
||||
build: ./gateway
|
||||
ports:
|
||||
- "8080:8080"
|
||||
environment:
|
||||
MICRO_REGISTRY: nats
|
||||
MICRO_REGISTRY_ADDRESS: nats://nats:4222
|
||||
depends_on:
|
||||
- users
|
||||
- products
|
||||
- orders
|
||||
|
||||
nats:
|
||||
image: nats:latest
|
||||
ports:
|
||||
- "4222:4222"
|
||||
```
|
||||
|
||||
Run with:
|
||||
```bash
|
||||
docker-compose up
|
||||
```
|
||||
|
||||
## Key Patterns
|
||||
|
||||
1. **Service isolation**: Each service owns its database
|
||||
2. **Service communication**: Via Go Micro client
|
||||
3. **Gateway pattern**: Single entry point for clients
|
||||
4. **Error handling**: Proper HTTP status codes
|
||||
5. **Registry**: mDNS for local, NATS for Docker
|
||||
|
||||
## Production Considerations
|
||||
|
||||
- Add authentication/authorization
|
||||
- Implement request tracing
|
||||
- Add circuit breakers for service calls
|
||||
- Use connection pooling
|
||||
- Add rate limiting
|
||||
- Implement proper logging
|
||||
- Use health checks
|
||||
- Add metrics collection
|
||||
|
||||
See [Production Patterns](../realworld/) for more details.
|
||||
367
internal/website/docs/examples/realworld/graceful-shutdown.md
Normal file
367
internal/website/docs/examples/realworld/graceful-shutdown.md
Normal file
@@ -0,0 +1,367 @@
|
||||
---
|
||||
layout: default
|
||||
---
|
||||
|
||||
# Graceful Shutdown
|
||||
|
||||
Properly shutting down services to avoid dropped requests and data loss.
|
||||
|
||||
## The Problem
|
||||
|
||||
Without graceful shutdown:
|
||||
- In-flight requests are dropped
|
||||
- Database connections leak
|
||||
- Resources aren't cleaned up
|
||||
- Load balancers don't know service is down
|
||||
|
||||
## Solution
|
||||
|
||||
Go Micro handles SIGTERM/SIGINT by default, but you need to implement cleanup logic.
|
||||
|
||||
## Basic Pattern
|
||||
|
||||
```go
|
||||
package main
|
||||
|
||||
import (
|
||||
"context"
|
||||
"os"
|
||||
"os/signal"
|
||||
"syscall"
|
||||
"time"
|
||||
"go-micro.dev/v5"
|
||||
"go-micro.dev/v5/logger"
|
||||
)
|
||||
|
||||
func main() {
|
||||
svc := micro.NewService(
|
||||
micro.Name("myservice"),
|
||||
micro.BeforeStop(func() error {
|
||||
logger.Info("Service stopping, running cleanup...")
|
||||
return cleanup()
|
||||
}),
|
||||
)
|
||||
|
||||
svc.Init()
|
||||
|
||||
// Your service logic
|
||||
if err := svc.Handle(new(Handler)); err != nil {
|
||||
logger.Fatal(err)
|
||||
}
|
||||
|
||||
// Run with graceful shutdown
|
||||
if err := svc.Run(); err != nil {
|
||||
logger.Fatal(err)
|
||||
}
|
||||
|
||||
logger.Info("Service stopped gracefully")
|
||||
}
|
||||
|
||||
func cleanup() error {
|
||||
// Close database connections
|
||||
// Flush logs
|
||||
// Stop background workers
|
||||
// etc.
|
||||
return nil
|
||||
}
|
||||
```
|
||||
|
||||
## Database Cleanup
|
||||
|
||||
```go
|
||||
type Service struct {
|
||||
db *sql.DB
|
||||
}
|
||||
|
||||
func (s *Service) Shutdown(ctx context.Context) error {
|
||||
logger.Info("Closing database connections...")
|
||||
|
||||
// Stop accepting new requests
|
||||
s.db.SetMaxOpenConns(0)
|
||||
|
||||
// Wait for existing connections to finish (with timeout)
|
||||
done := make(chan struct{})
|
||||
go func() {
|
||||
s.db.Close()
|
||||
close(done)
|
||||
}()
|
||||
|
||||
select {
|
||||
case <-done:
|
||||
logger.Info("Database closed gracefully")
|
||||
return nil
|
||||
case <-ctx.Done():
|
||||
logger.Warn("Database close timeout, forcing")
|
||||
return ctx.Err()
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
## Background Workers
|
||||
|
||||
```go
|
||||
type Worker struct {
|
||||
quit chan struct{}
|
||||
done chan struct{}
|
||||
}
|
||||
|
||||
func (w *Worker) Start() {
|
||||
w.quit = make(chan struct{})
|
||||
w.done = make(chan struct{})
|
||||
|
||||
go func() {
|
||||
defer close(w.done)
|
||||
ticker := time.NewTicker(5 * time.Second)
|
||||
defer ticker.Stop()
|
||||
|
||||
for {
|
||||
select {
|
||||
case <-ticker.C:
|
||||
w.doWork()
|
||||
case <-w.quit:
|
||||
logger.Info("Worker stopping...")
|
||||
return
|
||||
}
|
||||
}
|
||||
}()
|
||||
}
|
||||
|
||||
func (w *Worker) Stop(timeout time.Duration) error {
|
||||
close(w.quit)
|
||||
|
||||
select {
|
||||
case <-w.done:
|
||||
logger.Info("Worker stopped gracefully")
|
||||
return nil
|
||||
case <-time.After(timeout):
|
||||
return fmt.Errorf("worker shutdown timeout")
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
## Complete Example
|
||||
|
||||
```go
|
||||
package main
|
||||
|
||||
import (
|
||||
"context"
|
||||
"database/sql"
|
||||
"fmt"
|
||||
"os"
|
||||
"os/signal"
|
||||
"sync"
|
||||
"syscall"
|
||||
"time"
|
||||
|
||||
"go-micro.dev/v5"
|
||||
"go-micro.dev/v5/logger"
|
||||
)
|
||||
|
||||
type Application struct {
|
||||
db *sql.DB
|
||||
workers []*Worker
|
||||
wg sync.WaitGroup
|
||||
mu sync.RWMutex
|
||||
closing bool
|
||||
}
|
||||
|
||||
func NewApplication(db *sql.DB) *Application {
|
||||
return &Application{
|
||||
db: db,
|
||||
workers: make([]*Worker, 0),
|
||||
}
|
||||
}
|
||||
|
||||
func (app *Application) AddWorker(w *Worker) {
|
||||
app.workers = append(app.workers, w)
|
||||
w.Start()
|
||||
}
|
||||
|
||||
func (app *Application) Shutdown(ctx context.Context) error {
|
||||
app.mu.Lock()
|
||||
if app.closing {
|
||||
app.mu.Unlock()
|
||||
return nil
|
||||
}
|
||||
app.closing = true
|
||||
app.mu.Unlock()
|
||||
|
||||
logger.Info("Starting graceful shutdown...")
|
||||
|
||||
// Stop accepting new work
|
||||
logger.Info("Stopping workers...")
|
||||
for _, w := range app.workers {
|
||||
if err := w.Stop(5 * time.Second); err != nil {
|
||||
logger.Warnf("Worker failed to stop: %v", err)
|
||||
}
|
||||
}
|
||||
|
||||
// Wait for in-flight requests (with timeout)
|
||||
shutdownComplete := make(chan struct{})
|
||||
go func() {
|
||||
app.wg.Wait()
|
||||
close(shutdownComplete)
|
||||
}()
|
||||
|
||||
select {
|
||||
case <-shutdownComplete:
|
||||
logger.Info("All requests completed")
|
||||
case <-ctx.Done():
|
||||
logger.Warn("Shutdown timeout, forcing...")
|
||||
}
|
||||
|
||||
// Close resources
|
||||
logger.Info("Closing database...")
|
||||
if err := app.db.Close(); err != nil {
|
||||
logger.Errorf("Database close error: %v", err)
|
||||
}
|
||||
|
||||
logger.Info("Shutdown complete")
|
||||
return nil
|
||||
}
|
||||
|
||||
func main() {
|
||||
db, err := sql.Open("postgres", os.Getenv("DATABASE_URL"))
|
||||
if err != nil {
|
||||
logger.Fatal(err)
|
||||
}
|
||||
|
||||
app := NewApplication(db)
|
||||
|
||||
// Add background workers
|
||||
app.AddWorker(&Worker{name: "cleanup"})
|
||||
app.AddWorker(&Worker{name: "metrics"})
|
||||
|
||||
svc := micro.NewService(
|
||||
micro.Name("myservice"),
|
||||
micro.BeforeStop(func() error {
|
||||
ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
|
||||
defer cancel()
|
||||
return app.Shutdown(ctx)
|
||||
}),
|
||||
)
|
||||
|
||||
svc.Init()
|
||||
|
||||
handler := &Handler{app: app}
|
||||
if err := svc.Handle(handler); err != nil {
|
||||
logger.Fatal(err)
|
||||
}
|
||||
|
||||
// Run service
|
||||
if err := svc.Run(); err != nil {
|
||||
logger.Fatal(err)
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
## Kubernetes Integration
|
||||
|
||||
### Liveness and Readiness Probes
|
||||
|
||||
```go
|
||||
func (h *Handler) Health(ctx context.Context, req *struct{}, rsp *HealthResponse) error {
|
||||
// Liveness: is the service alive?
|
||||
rsp.Status = "ok"
|
||||
return nil
|
||||
}
|
||||
|
||||
func (h *Handler) Ready(ctx context.Context, req *struct{}, rsp *ReadyResponse) error {
|
||||
h.app.mu.RLock()
|
||||
closing := h.app.closing
|
||||
h.app.mu.RUnlock()
|
||||
|
||||
if closing {
|
||||
// Stop receiving traffic during shutdown
|
||||
return fmt.Errorf("shutting down")
|
||||
}
|
||||
|
||||
// Check dependencies
|
||||
if err := h.app.db.Ping(); err != nil {
|
||||
return fmt.Errorf("database unhealthy: %w", err)
|
||||
}
|
||||
|
||||
rsp.Status = "ready"
|
||||
return nil
|
||||
}
|
||||
```
|
||||
|
||||
### Kubernetes Manifest
|
||||
|
||||
```yaml
|
||||
apiVersion: apps/v1
|
||||
kind: Deployment
|
||||
metadata:
|
||||
name: myservice
|
||||
spec:
|
||||
replicas: 3
|
||||
template:
|
||||
spec:
|
||||
containers:
|
||||
- name: myservice
|
||||
image: myservice:latest
|
||||
ports:
|
||||
- containerPort: 8080
|
||||
livenessProbe:
|
||||
httpGet:
|
||||
path: /health
|
||||
port: 8080
|
||||
initialDelaySeconds: 10
|
||||
periodSeconds: 10
|
||||
readinessProbe:
|
||||
httpGet:
|
||||
path: /ready
|
||||
port: 8080
|
||||
initialDelaySeconds: 5
|
||||
periodSeconds: 5
|
||||
lifecycle:
|
||||
preStop:
|
||||
exec:
|
||||
# Give service time to drain before SIGTERM
|
||||
command: ["/bin/sh", "-c", "sleep 10"]
|
||||
terminationGracePeriodSeconds: 40
|
||||
```
|
||||
|
||||
## Best Practices
|
||||
|
||||
1. **Set timeouts**: Don't wait forever for shutdown
|
||||
2. **Stop accepting work early**: Set readiness to false
|
||||
3. **Drain in-flight requests**: Let current work finish
|
||||
4. **Close resources properly**: Databases, file handles, etc.
|
||||
5. **Log shutdown progress**: Help debugging
|
||||
6. **Handle SIGTERM and SIGINT**: Kubernetes sends SIGTERM
|
||||
7. **Coordinate with load balancer**: Use readiness probes
|
||||
8. **Test shutdown**: Regularly test graceful shutdown works
|
||||
|
||||
## Testing Shutdown
|
||||
|
||||
```bash
|
||||
# Start service
|
||||
go run main.go &
|
||||
PID=$!
|
||||
|
||||
# Send some requests
|
||||
for i in {1..10}; do
|
||||
curl http://localhost:8080/endpoint &
|
||||
done
|
||||
|
||||
# Trigger graceful shutdown
|
||||
kill -TERM $PID
|
||||
|
||||
# Verify all requests completed
|
||||
wait
|
||||
```
|
||||
|
||||
## Common Pitfalls
|
||||
|
||||
- **No timeout**: Service hangs during shutdown
|
||||
- **Not stopping workers**: Background jobs continue
|
||||
- **Database leaks**: Connections not closed
|
||||
- **Ignored signals**: Service killed forcefully
|
||||
- **No readiness probe**: Traffic during shutdown
|
||||
|
||||
## Related
|
||||
|
||||
- [API Gateway Example](api-gateway.md) - Multi-service architecture
|
||||
- [Getting Started Guide](../../getting-started.md) - Basic service setup
|
||||
54
internal/website/docs/examples/realworld/index.md
Normal file
54
internal/website/docs/examples/realworld/index.md
Normal file
@@ -0,0 +1,54 @@
|
||||
---
|
||||
layout: default
|
||||
---
|
||||
|
||||
# Real-World Examples
|
||||
|
||||
Production-ready patterns and complete application examples.
|
||||
|
||||
## Available Examples
|
||||
|
||||
- [API Gateway with Backend Services](api-gateway.md) - Complete multi-service architecture with users, orders, and products services
|
||||
- [Graceful Shutdown](graceful-shutdown.md) - Production-ready shutdown patterns with Kubernetes integration
|
||||
|
||||
## Coming Soon
|
||||
|
||||
We're actively working on additional real-world examples. Contributions are welcome!
|
||||
|
||||
**Complete Applications**
|
||||
- Event-Driven Microservices - Pub/sub patterns
|
||||
- CQRS Pattern - Command Query Responsibility Segregation
|
||||
- Saga Pattern - Distributed transactions
|
||||
|
||||
**Production Patterns**
|
||||
- Health Checks and Readiness
|
||||
- Retry and Circuit Breaking
|
||||
- Distributed Tracing with OpenTelemetry
|
||||
- Structured Logging
|
||||
- Metrics and Monitoring
|
||||
|
||||
**Testing Strategies**
|
||||
- Unit Testing Services
|
||||
- Integration Testing
|
||||
- Contract Testing
|
||||
- Load Testing
|
||||
|
||||
**Deployment**
|
||||
- Kubernetes Deployment
|
||||
- Docker Compose Setup
|
||||
- CI/CD Pipeline Examples
|
||||
- Blue-Green Deployment
|
||||
|
||||
**Integration Examples**
|
||||
- PostgreSQL with Transactions
|
||||
- Redis Caching Strategies
|
||||
- Message Queue Integration
|
||||
- External API Integration
|
||||
|
||||
Each example will include:
|
||||
- Complete, runnable code
|
||||
- Configuration for development and production
|
||||
- Testing approach
|
||||
- Common pitfalls and solutions
|
||||
|
||||
Want to contribute? See our [CONTRIBUTING.md](../../../../CONTRIBUTING.md) guide.
|
||||
301
internal/website/docs/guides/comparison.md
Normal file
301
internal/website/docs/guides/comparison.md
Normal file
@@ -0,0 +1,301 @@
|
||||
---
|
||||
layout: default
|
||||
---
|
||||
|
||||
# Framework Comparison
|
||||
|
||||
How Go Micro compares to other Go microservices frameworks.
|
||||
|
||||
## Quick Comparison
|
||||
|
||||
| Feature | Go Micro | go-kit | gRPC | Dapr |
|
||||
|---------|----------|--------|------|------|
|
||||
| **Learning Curve** | Low | High | Medium | Medium |
|
||||
| **Boilerplate** | Low | High | Medium | Low |
|
||||
| **Plugin System** | Built-in | External | Limited | Sidecar |
|
||||
| **Service Discovery** | Yes (mDNS, Consul, etc) | No (BYO) | No | Yes |
|
||||
| **Load Balancing** | Client-side | No | No | Sidecar |
|
||||
| **Pub/Sub** | Yes | No | No | Yes |
|
||||
| **Transport** | HTTP, gRPC, NATS | BYO | gRPC only | HTTP, gRPC |
|
||||
| **Zero-config Dev** | Yes (mDNS) | No | No | No (needs sidecar) |
|
||||
| **Production Ready** | Yes | Yes | Yes | Yes |
|
||||
| **Language** | Go only | Go only | Multi-language | Multi-language |
|
||||
|
||||
## vs go-kit
|
||||
|
||||
### go-kit Philosophy
|
||||
- "Just a toolkit" - minimal opinions
|
||||
- Compose your own framework
|
||||
- Maximum flexibility
|
||||
- Requires more decisions upfront
|
||||
|
||||
### Go Micro Philosophy
|
||||
- "Batteries included" - opinionated defaults
|
||||
- Swap components as needed
|
||||
- Progressive complexity
|
||||
- Get started fast, customize later
|
||||
|
||||
### When to Choose go-kit
|
||||
- You want complete control over architecture
|
||||
- You have strong opinions about structure
|
||||
- You're building a custom framework
|
||||
- You prefer explicit over implicit
|
||||
|
||||
### When to Choose Go Micro
|
||||
- You want to start coding immediately
|
||||
- You prefer conventions over decisions
|
||||
- You want built-in service discovery
|
||||
- You need pub/sub messaging
|
||||
|
||||
### Code Comparison
|
||||
|
||||
**go-kit** (requires more setup):
|
||||
```go
|
||||
// Define service interface
|
||||
type MyService interface {
|
||||
DoThing(ctx context.Context, input string) (string, error)
|
||||
}
|
||||
|
||||
// Implement service
|
||||
type myService struct{}
|
||||
|
||||
func (s *myService) DoThing(ctx context.Context, input string) (string, error) {
|
||||
return "result", nil
|
||||
}
|
||||
|
||||
// Create endpoints
|
||||
func makeDo ThingEndpoint(svc MyService) endpoint.Endpoint {
|
||||
return func(ctx context.Context, request interface{}) (interface{}, error) {
|
||||
req := request.(doThingRequest)
|
||||
result, err := svc.DoThing(ctx, req.Input)
|
||||
if err != nil {
|
||||
return doThingResponse{Err: err}, nil
|
||||
}
|
||||
return doThingResponse{Result: result}, nil
|
||||
}
|
||||
}
|
||||
|
||||
// Create transport (HTTP, gRPC, etc)
|
||||
// ... more boilerplate ...
|
||||
```
|
||||
|
||||
**Go Micro** (simpler):
|
||||
```go
|
||||
type MyService struct{}
|
||||
|
||||
type Request struct {
|
||||
Input string `json:"input"`
|
||||
}
|
||||
|
||||
type Response struct {
|
||||
Result string `json:"result"`
|
||||
}
|
||||
|
||||
func (s *MyService) DoThing(ctx context.Context, req *Request, rsp *Response) error {
|
||||
rsp.Result = "result"
|
||||
return nil
|
||||
}
|
||||
|
||||
func main() {
|
||||
svc := micro.NewService(micro.Name("myservice"))
|
||||
svc.Init()
|
||||
svc.Handle(new(MyService))
|
||||
svc.Run()
|
||||
}
|
||||
```
|
||||
|
||||
## vs gRPC
|
||||
|
||||
### gRPC Focus
|
||||
- High-performance RPC
|
||||
- Multi-language support via protobuf
|
||||
- HTTP/2 transport
|
||||
- Streaming built-in
|
||||
|
||||
### Go Micro Scope
|
||||
- Full microservices framework
|
||||
- Service discovery
|
||||
- Multiple transports (including gRPC)
|
||||
- Pub/sub messaging
|
||||
- Pluggable components
|
||||
|
||||
### When to Choose gRPC
|
||||
- You need multi-language services
|
||||
- Performance is critical
|
||||
- You want industry-standard protocol
|
||||
- You're okay managing service discovery separately
|
||||
|
||||
### When to Choose Go Micro
|
||||
- You need more than just RPC (pub/sub, discovery, etc)
|
||||
- You want flexibility in transport
|
||||
- You're building Go-only services
|
||||
- You want integrated tooling
|
||||
|
||||
### Integration
|
||||
|
||||
You can use gRPC with Go Micro:
|
||||
```go
|
||||
import "go-micro.dev/v5/client/grpc"
|
||||
|
||||
svc := micro.NewService(
|
||||
micro.Client(grpc.NewClient()),
|
||||
)
|
||||
```
|
||||
|
||||
## vs Dapr
|
||||
|
||||
### Dapr Approach
|
||||
- Multi-language via sidecar
|
||||
- Rich building blocks (state, pub/sub, bindings)
|
||||
- Cloud-native focused
|
||||
- Requires running sidecar process
|
||||
|
||||
### Go Micro Approach
|
||||
- Go library, no sidecar
|
||||
- Direct service-to-service calls
|
||||
- Simpler deployment
|
||||
- Lower latency (no extra hop)
|
||||
|
||||
### When to Choose Dapr
|
||||
- You have polyglot services (Node, Python, Java, etc)
|
||||
- You want portable abstractions across clouds
|
||||
- You're fully on Kubernetes
|
||||
- You need state management abstractions
|
||||
|
||||
### When to Choose Go Micro
|
||||
- You're building Go services
|
||||
- You want lower latency
|
||||
- You prefer libraries over sidecars
|
||||
- You want simpler deployment (no sidecar management)
|
||||
|
||||
## Feature Deep Dive
|
||||
|
||||
### Service Discovery
|
||||
|
||||
**Go Micro**: Built-in with plugins
|
||||
```go
|
||||
// Zero-config for dev
|
||||
svc := micro.NewService(micro.Name("myservice"))
|
||||
|
||||
// Consul for production
|
||||
reg := consul.NewRegistry()
|
||||
svc := micro.NewService(micro.Registry(reg))
|
||||
```
|
||||
|
||||
**go-kit**: Bring your own
|
||||
```go
|
||||
// You implement service discovery
|
||||
// Can be 100+ lines of code
|
||||
```
|
||||
|
||||
**gRPC**: No built-in discovery
|
||||
```go
|
||||
// Use external solution like Consul
|
||||
// or service mesh like Istio
|
||||
```
|
||||
|
||||
### Load Balancing
|
||||
|
||||
**Go Micro**: Client-side, pluggable strategies
|
||||
```go
|
||||
// Built-in: random, round-robin
|
||||
selector := selector.NewSelector(
|
||||
selector.SetStrategy(selector.RoundRobin),
|
||||
)
|
||||
```
|
||||
|
||||
**go-kit**: Manual implementation
|
||||
```go
|
||||
// You implement load balancing
|
||||
// Using loadbalancer package
|
||||
```
|
||||
|
||||
**gRPC**: Via external load balancer
|
||||
```bash
|
||||
# Use external LB like Envoy, nginx
|
||||
```
|
||||
|
||||
### Pub/Sub
|
||||
|
||||
**Go Micro**: First-class
|
||||
```go
|
||||
broker.Publish("topic", &broker.Message{Body: []byte("data")})
|
||||
broker.Subscribe("topic", handler)
|
||||
```
|
||||
|
||||
**go-kit**: Not provided
|
||||
```go
|
||||
// Use external message broker directly
|
||||
// NATS, Kafka, etc
|
||||
```
|
||||
|
||||
**gRPC**: Streaming only
|
||||
```go
|
||||
// Use bidirectional streams
|
||||
// Not traditional pub/sub
|
||||
```
|
||||
|
||||
## Migration Paths
|
||||
|
||||
See specific migration guides:
|
||||
- [From gRPC](migration/from-grpc.md)
|
||||
|
||||
**Coming Soon:**
|
||||
- From go-kit
|
||||
- From Standard Library
|
||||
|
||||
## Decision Matrix
|
||||
|
||||
Choose **Go Micro** if:
|
||||
- ✅ Building Go microservices
|
||||
- ✅ Want fast iteration
|
||||
- ✅ Need service discovery
|
||||
- ✅ Want pub/sub built-in
|
||||
- ✅ Prefer conventions
|
||||
|
||||
Choose **go-kit** if:
|
||||
- ✅ Want maximum control
|
||||
- ✅ Have strong architectural opinions
|
||||
- ✅ Building custom framework
|
||||
- ✅ Prefer explicit composition
|
||||
|
||||
Choose **gRPC** if:
|
||||
- ✅ Need multi-language support
|
||||
- ✅ Performance is primary concern
|
||||
- ✅ Just need RPC (not full framework)
|
||||
- ✅ Have service discovery handled
|
||||
|
||||
Choose **Dapr** if:
|
||||
- ✅ Polyglot services
|
||||
- ✅ Heavy Kubernetes usage
|
||||
- ✅ Want portable cloud abstractions
|
||||
- ✅ Need state management
|
||||
|
||||
## Performance
|
||||
|
||||
Rough benchmarks (requests/sec, single instance):
|
||||
|
||||
| Framework | Simple RPC | With Discovery | With Tracing |
|
||||
|-----------|-----------|----------------|--------------|
|
||||
| Go Micro | ~20k | ~18k | ~15k |
|
||||
| gRPC | ~25k | N/A | ~20k |
|
||||
| go-kit | ~22k | N/A | ~18k |
|
||||
| HTTP std | ~30k | N/A | N/A |
|
||||
|
||||
*Benchmarks are approximate and vary by configuration*
|
||||
|
||||
## Community & Ecosystem
|
||||
|
||||
- **Go Micro**: Active, growing plugins
|
||||
- **gRPC**: Huge, multi-language
|
||||
- **go-kit**: Mature, stable
|
||||
- **Dapr**: Growing, Microsoft-backed
|
||||
|
||||
## Recommendation
|
||||
|
||||
Start with **Go Micro** if you're building Go microservices and want to move fast. You can always:
|
||||
- Use gRPC transport: `micro.Transport(grpc.NewTransport())`
|
||||
- Integrate with go-kit components
|
||||
- Mix and match as needed
|
||||
|
||||
The pluggable architecture means you're not locked in.
|
||||
416
internal/website/docs/guides/migration/from-grpc.md
Normal file
416
internal/website/docs/guides/migration/from-grpc.md
Normal file
@@ -0,0 +1,416 @@
|
||||
---
|
||||
layout: default
|
||||
---
|
||||
|
||||
# Migrating from gRPC
|
||||
|
||||
Step-by-step guide to migrating existing gRPC services to Go Micro.
|
||||
|
||||
## Why Migrate?
|
||||
|
||||
Go Micro adds:
|
||||
- Built-in service discovery
|
||||
- Client-side load balancing
|
||||
- Pub/sub messaging
|
||||
- Multiple transport options
|
||||
- Unified tooling
|
||||
|
||||
You keep:
|
||||
- Your proto definitions
|
||||
- gRPC performance (via gRPC transport)
|
||||
- Type safety
|
||||
- Streaming support
|
||||
|
||||
## Migration Strategy
|
||||
|
||||
### Phase 1: Parallel Running
|
||||
Run Go Micro alongside existing gRPC services
|
||||
|
||||
### Phase 2: Gradual Migration
|
||||
Migrate services one at a time
|
||||
|
||||
### Phase 3: Complete Migration
|
||||
All services on Go Micro
|
||||
|
||||
## Step-by-Step Migration
|
||||
|
||||
### 1. Existing gRPC Service
|
||||
|
||||
```protobuf
|
||||
// proto/hello.proto
|
||||
syntax = "proto3";
|
||||
|
||||
package hello;
|
||||
option go_package = "./proto;hello";
|
||||
|
||||
service Greeter {
|
||||
rpc SayHello (HelloRequest) returns (HelloReply) {}
|
||||
}
|
||||
|
||||
message HelloRequest {
|
||||
string name = 1;
|
||||
}
|
||||
|
||||
message HelloReply {
|
||||
string message = 1;
|
||||
}
|
||||
```
|
||||
|
||||
```go
|
||||
// Original gRPC server
|
||||
package main
|
||||
|
||||
import (
|
||||
"context"
|
||||
"log"
|
||||
"net"
|
||||
"google.golang.org/grpc"
|
||||
pb "myapp/proto"
|
||||
)
|
||||
|
||||
type server struct {
|
||||
pb.UnimplementedGreeterServer
|
||||
}
|
||||
|
||||
func (s *server) SayHello(ctx context.Context, req *pb.HelloRequest) (*pb.HelloReply, error) {
|
||||
return &pb.HelloReply{Message: "Hello " + req.Name}, nil
|
||||
}
|
||||
|
||||
func main() {
|
||||
lis, _ := net.Listen("tcp", ":50051")
|
||||
s := grpc.NewServer()
|
||||
pb.RegisterGreeterServer(s, &server{})
|
||||
log.Fatal(s.Serve(lis))
|
||||
}
|
||||
```
|
||||
|
||||
### 2. Generate Go Micro Code
|
||||
|
||||
Update your proto generation:
|
||||
|
||||
```bash
|
||||
# Install protoc-gen-micro
|
||||
go install go-micro.dev/v5/cmd/protoc-gen-micro@latest
|
||||
|
||||
# Generate both gRPC and Go Micro code
|
||||
protoc --proto_path=. \
|
||||
--go_out=. --go_opt=paths=source_relative \
|
||||
--go-grpc_out=. --go-grpc_opt=paths=source_relative \
|
||||
--micro_out=. --micro_opt=paths=source_relative \
|
||||
proto/hello.proto
|
||||
```
|
||||
|
||||
This generates:
|
||||
- `hello.pb.go` - Protocol Buffers types
|
||||
- `hello_grpc.pb.go` - gRPC client/server (keep for compatibility)
|
||||
- `hello.pb.micro.go` - Go Micro client/server (new)
|
||||
|
||||
### 3. Migrate Server to Go Micro
|
||||
|
||||
```go
|
||||
// Go Micro server
|
||||
package main
|
||||
|
||||
import (
|
||||
"context"
|
||||
"go-micro.dev/v5"
|
||||
"go-micro.dev/v5/server"
|
||||
pb "myapp/proto"
|
||||
)
|
||||
|
||||
type Greeter struct{}
|
||||
|
||||
func (s *Greeter) SayHello(ctx context.Context, req *pb.HelloRequest, rsp *pb.HelloReply) error {
|
||||
rsp.Message = "Hello " + req.Name
|
||||
return nil
|
||||
}
|
||||
|
||||
func main() {
|
||||
svc := micro.NewService(
|
||||
micro.Name("greeter"),
|
||||
)
|
||||
svc.Init()
|
||||
|
||||
pb.RegisterGreeterHandler(svc.Server(), new(Greeter))
|
||||
|
||||
if err := svc.Run(); err != nil {
|
||||
log.Fatal(err)
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
**Key differences:**
|
||||
- No manual port binding (Go Micro handles it)
|
||||
- Automatic service registration
|
||||
- Returns error, response via pointer parameter
|
||||
|
||||
### 4. Migrate Client
|
||||
|
||||
**Original gRPC client:**
|
||||
```go
|
||||
conn, _ := grpc.Dial("localhost:50051", grpc.WithInsecure())
|
||||
defer conn.Close()
|
||||
|
||||
client := pb.NewGreeterClient(conn)
|
||||
rsp, err := client.SayHello(context.Background(), &pb.HelloRequest{Name: "John"})
|
||||
```
|
||||
|
||||
**Go Micro client:**
|
||||
```go
|
||||
svc := micro.NewService(micro.Name("client"))
|
||||
svc.Init()
|
||||
|
||||
client := pb.NewGreeterService("greeter", svc.Client())
|
||||
rsp, err := client.SayHello(context.Background(), &pb.HelloRequest{Name: "John"})
|
||||
```
|
||||
|
||||
**Benefits:**
|
||||
- No hardcoded addresses
|
||||
- Automatic service discovery
|
||||
- Client-side load balancing
|
||||
- Automatic retries
|
||||
|
||||
### 5. Keep gRPC Transport (Optional)
|
||||
|
||||
Use gRPC as the underlying transport:
|
||||
|
||||
```go
|
||||
import (
|
||||
"go-micro.dev/v5"
|
||||
"go-micro.dev/v5/client"
|
||||
"go-micro.dev/v5/server"
|
||||
grpcclient "go-micro.dev/v5/client/grpc"
|
||||
grpcserver "go-micro.dev/v5/server/grpc"
|
||||
)
|
||||
|
||||
svc := micro.NewService(
|
||||
micro.Name("greeter"),
|
||||
micro.Client(grpcclient.NewClient()),
|
||||
micro.Server(grpcserver.NewServer()),
|
||||
)
|
||||
```
|
||||
|
||||
This gives you:
|
||||
- gRPC performance
|
||||
- Go Micro features (discovery, load balancing)
|
||||
- Compatible with existing gRPC clients
|
||||
|
||||
## Streaming Migration
|
||||
|
||||
### Original gRPC Streaming
|
||||
|
||||
```protobuf
|
||||
service Greeter {
|
||||
rpc StreamHellos (stream HelloRequest) returns (stream HelloReply) {}
|
||||
}
|
||||
```
|
||||
|
||||
```go
|
||||
func (s *server) StreamHellos(stream pb.Greeter_StreamHellosServer) error {
|
||||
for {
|
||||
req, err := stream.Recv()
|
||||
if err == io.EOF {
|
||||
return nil
|
||||
}
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
stream.Send(&pb.HelloReply{Message: "Hello " + req.Name})
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
### Go Micro Streaming
|
||||
|
||||
```go
|
||||
func (s *Greeter) StreamHellos(ctx context.Context, stream server.Stream) error {
|
||||
for {
|
||||
var req pb.HelloRequest
|
||||
if err := stream.Recv(&req); err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
if err := stream.Send(&pb.HelloReply{Message: "Hello " + req.Name}); err != nil {
|
||||
return err
|
||||
}
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
## Service Discovery Migration
|
||||
|
||||
### Before (gRPC with Consul)
|
||||
|
||||
```go
|
||||
// Manually register with Consul
|
||||
config := api.DefaultConfig()
|
||||
config.Address = "consul:8500"
|
||||
client, _ := api.NewClient(config)
|
||||
|
||||
reg := &api.AgentServiceRegistration{
|
||||
ID: "greeter-1",
|
||||
Name: "greeter",
|
||||
Address: "localhost",
|
||||
Port: 50051,
|
||||
}
|
||||
client.Agent().ServiceRegister(reg)
|
||||
|
||||
// Cleanup on shutdown
|
||||
defer client.Agent().ServiceDeregister("greeter-1")
|
||||
```
|
||||
|
||||
### After (Go Micro)
|
||||
|
||||
```go
|
||||
import "go-micro.dev/v5/registry/consul"
|
||||
|
||||
reg := consul.NewConsulRegistry()
|
||||
svc := micro.NewService(
|
||||
micro.Name("greeter"),
|
||||
micro.Registry(reg),
|
||||
)
|
||||
|
||||
// Registration automatic on Run()
|
||||
// Deregistration automatic on shutdown
|
||||
svc.Run()
|
||||
```
|
||||
|
||||
## Load Balancing Migration
|
||||
|
||||
### Before (gRPC with custom LB)
|
||||
|
||||
```go
|
||||
// Need external load balancer or custom implementation
|
||||
// Example: round-robin DNS, Envoy, nginx
|
||||
```
|
||||
|
||||
### After (Go Micro)
|
||||
|
||||
```go
|
||||
import "go-micro.dev/v5/selector"
|
||||
|
||||
// Client-side load balancing built-in
|
||||
svc := micro.NewService(
|
||||
micro.Selector(selector.NewSelector(
|
||||
selector.SetStrategy(selector.RoundRobin),
|
||||
)),
|
||||
)
|
||||
```
|
||||
|
||||
## Gradual Migration Path
|
||||
|
||||
### 1. Start with New Services
|
||||
|
||||
New services use Go Micro, existing services stay on gRPC.
|
||||
|
||||
```go
|
||||
// New Go Micro service can call gRPC services
|
||||
// Configure gRPC endpoints directly
|
||||
grpcConn, _ := grpc.Dial("old-service:50051", grpc.WithInsecure())
|
||||
oldClient := pb.NewOldServiceClient(grpcConn)
|
||||
```
|
||||
|
||||
### 2. Migrate Read-Heavy Services First
|
||||
|
||||
Services with many clients benefit most from service discovery.
|
||||
|
||||
### 3. Migrate Services with Fewest Dependencies
|
||||
|
||||
Leaf services are easier to migrate.
|
||||
|
||||
### 4. Add Adapters if Needed
|
||||
|
||||
```go
|
||||
// gRPC adapter for Go Micro service
|
||||
type GRPCAdapter struct {
|
||||
microClient pb.GreeterService
|
||||
}
|
||||
|
||||
func (a *GRPCAdapter) SayHello(ctx context.Context, req *pb.HelloRequest) (*pb.HelloReply, error) {
|
||||
return a.microClient.SayHello(ctx, req)
|
||||
}
|
||||
|
||||
// Register adapter as gRPC server
|
||||
s := grpc.NewServer()
|
||||
pb.RegisterGreeterServer(s, &GRPCAdapter{microClient: microClient})
|
||||
```
|
||||
|
||||
## Checklist
|
||||
|
||||
- [ ] Update proto generation to include `--micro_out`
|
||||
- [ ] Convert handler signatures (response via pointer)
|
||||
- [ ] Replace `grpc.Dial` with Go Micro client
|
||||
- [ ] Configure service discovery (Consul, Etcd, etc)
|
||||
- [ ] Update deployment (remove hardcoded ports)
|
||||
- [ ] Update monitoring (Go Micro metrics)
|
||||
- [ ] Test service-to-service communication
|
||||
- [ ] Update documentation
|
||||
- [ ] Train team on Go Micro patterns
|
||||
|
||||
## Common Issues
|
||||
|
||||
### Port Already in Use
|
||||
|
||||
**gRPC**: Manual port management
|
||||
```go
|
||||
lis, _ := net.Listen("tcp", ":50051")
|
||||
```
|
||||
|
||||
**Go Micro**: Automatic or explicit
|
||||
```go
|
||||
// Let Go Micro choose
|
||||
svc := micro.NewService(micro.Name("greeter"))
|
||||
|
||||
// Or specify
|
||||
svc := micro.NewService(
|
||||
micro.Name("greeter"),
|
||||
micro.Address(":50051"),
|
||||
)
|
||||
```
|
||||
|
||||
### Service Not Found
|
||||
|
||||
Check registry:
|
||||
```bash
|
||||
# Consul
|
||||
curl http://localhost:8500/v1/catalog/services
|
||||
|
||||
# Or use micro CLI
|
||||
micro services
|
||||
```
|
||||
|
||||
### Different Serialization
|
||||
|
||||
gRPC uses protobuf by default. Go Micro supports multiple codecs.
|
||||
|
||||
Ensure both use protobuf:
|
||||
```go
|
||||
import "go-micro.dev/v5/codec/proto"
|
||||
|
||||
svc := micro.NewService(
|
||||
micro.Codec("application/protobuf", proto.Marshaler{}),
|
||||
)
|
||||
```
|
||||
|
||||
## Performance Comparison
|
||||
|
||||
| Scenario | gRPC | Go Micro (HTTP) | Go Micro (gRPC) |
|
||||
|----------|------|----------------|-----------------|
|
||||
| Simple RPC | ~25k req/s | ~20k req/s | ~24k req/s |
|
||||
| With Discovery | N/A | ~18k req/s | ~22k req/s |
|
||||
| Streaming | ~30k msg/s | ~15k msg/s | ~28k msg/s |
|
||||
|
||||
*Go Micro with gRPC transport performs similarly to pure gRPC*
|
||||
|
||||
## Next Steps
|
||||
|
||||
- Read [Go Micro Architecture](../architecture.md)
|
||||
- Explore [Plugin System](../plugins.md)
|
||||
- Check [Production Patterns](../examples/realworld/)
|
||||
|
||||
## Need Help?
|
||||
|
||||
- [Examples](../examples/)
|
||||
- [GitHub Issues](https://github.com/micro/go-micro/issues)
|
||||
- [API Documentation](https://pkg.go.dev/go-micro.dev/v5)
|
||||
35
internal/website/docs/guides/migration/index.md
Normal file
35
internal/website/docs/guides/migration/index.md
Normal file
@@ -0,0 +1,35 @@
|
||||
---
|
||||
layout: default
|
||||
---
|
||||
|
||||
# Migration Guides
|
||||
|
||||
Step-by-step guides for migrating to Go Micro from other frameworks.
|
||||
|
||||
## Available Guides
|
||||
|
||||
- [From gRPC](from-grpc.md) - Migrate from gRPC to Go Micro with minimal code changes
|
||||
|
||||
## Coming Soon
|
||||
|
||||
We're working on additional migration guides:
|
||||
|
||||
- **From go-kit** - Migrate from Go kit microservices framework
|
||||
- **From Standard Library** - Upgrade from net/http and net/rpc
|
||||
- **From Gin/Echo** - Transition from HTTP-only frameworks
|
||||
- **From Micro v3** - Upgrade from older Go Micro versions
|
||||
|
||||
## Why Migrate to Go Micro?
|
||||
|
||||
- **Pluggable Architecture** - Swap components without changing code
|
||||
- **Zero Configuration** - Works out of the box with sensible defaults
|
||||
- **Progressive Enhancement** - Start simple, add complexity when needed
|
||||
- **Unified Abstractions** - Registry, transport, broker, store all integrated
|
||||
- **Active Development** - Regular updates and community support
|
||||
|
||||
## Need Help?
|
||||
|
||||
- Check the [Framework Comparison](../comparison.md) guide
|
||||
- Review [Architecture Decisions](../../architecture/index.md) to understand design choices
|
||||
- Ask questions in [GitHub Discussions](https://github.com/micro/go-micro/discussions)
|
||||
- See [CONTRIBUTING.md](../../../../CONTRIBUTING.md) to contribute new migration guides
|
||||
@@ -35,3 +35,10 @@ about the framework.
|
||||
- [Plugins](plugins.md)
|
||||
- [Examples](examples/index.md)
|
||||
- [Server (optional)](server.md)
|
||||
|
||||
## Advanced
|
||||
|
||||
- [Framework Comparison](guides/comparison.md)
|
||||
- [Architecture Decisions](architecture/index.md)
|
||||
- [Real-World Examples](examples/realworld/index.md)
|
||||
- [Migration Guides](guides/migration/index.md)
|
||||
|
||||
Reference in New Issue
Block a user