1
0
mirror of https://github.com/go-micro/go-micro.git synced 2024-12-18 08:26:38 +02:00
go-micro/util/wrapper/wrapper.go
2024-06-04 21:40:43 +01:00

174 lines
4.6 KiB
Go

package wrapper
import (
"context"
"strings"
"go-micro.dev/v5/auth"
"go-micro.dev/v5/client"
"go-micro.dev/v5/debug/stats"
"go-micro.dev/v5/debug/trace"
"go-micro.dev/v5/metadata"
"go-micro.dev/v5/server"
"go-micro.dev/v5/transport/headers"
)
type fromServiceWrapper struct {
client.Client
// headers to inject
headers metadata.Metadata
}
func (f *fromServiceWrapper) setHeaders(ctx context.Context) context.Context {
// don't overwrite keys
return metadata.MergeContext(ctx, f.headers, false)
}
func (f *fromServiceWrapper) Call(ctx context.Context, req client.Request, rsp interface{}, opts ...client.CallOption) error {
ctx = f.setHeaders(ctx)
return f.Client.Call(ctx, req, rsp, opts...)
}
func (f *fromServiceWrapper) Stream(ctx context.Context, req client.Request, opts ...client.CallOption) (client.Stream, error) {
ctx = f.setHeaders(ctx)
return f.Client.Stream(ctx, req, opts...)
}
func (f *fromServiceWrapper) Publish(ctx context.Context, p client.Message, opts ...client.PublishOption) error {
ctx = f.setHeaders(ctx)
return f.Client.Publish(ctx, p, opts...)
}
// FromService wraps a client to inject service and auth metadata.
func FromService(name string, c client.Client) client.Client {
return &fromServiceWrapper{
c,
metadata.Metadata{
headers.Prefix + "From-Service": name,
},
}
}
// HandlerStats wraps a server handler to generate request/error stats.
func HandlerStats(stats stats.Stats) server.HandlerWrapper {
// return a handler wrapper
return func(h server.HandlerFunc) server.HandlerFunc {
// return a function that returns a function
return func(ctx context.Context, req server.Request, rsp interface{}) error {
// execute the handler
err := h(ctx, req, rsp)
// record the stats
stats.Record(err)
// return the error
return err
}
}
}
type traceWrapper struct {
client.Client
trace trace.Tracer
name string
}
func (c *traceWrapper) Call(ctx context.Context, req client.Request, rsp interface{}, opts ...client.CallOption) error {
newCtx, s := c.trace.Start(ctx, req.Service()+"."+req.Endpoint())
s.Type = trace.SpanTypeRequestOutbound
err := c.Client.Call(newCtx, req, rsp, opts...)
if err != nil {
s.Metadata["error"] = err.Error()
}
// finish the trace
c.trace.Finish(s)
return err
}
// TraceCall is a call tracing wrapper.
func TraceCall(name string, t trace.Tracer, c client.Client) client.Client {
return &traceWrapper{
name: name,
trace: t,
Client: c,
}
}
// TraceHandler wraps a server handler to perform tracing.
func TraceHandler(t trace.Tracer) server.HandlerWrapper {
// return a handler wrapper
return func(h server.HandlerFunc) server.HandlerFunc {
// return a function that returns a function
return func(ctx context.Context, req server.Request, rsp interface{}) error {
// don't store traces for debug
if strings.HasPrefix(req.Endpoint(), "Debug.") {
return h(ctx, req, rsp)
}
// get the span
newCtx, s := t.Start(ctx, req.Service()+"."+req.Endpoint())
s.Type = trace.SpanTypeRequestInbound
err := h(newCtx, req, rsp)
if err != nil {
s.Metadata["error"] = err.Error()
}
// finish
t.Finish(s)
return err
}
}
}
func AuthCall(a func() auth.Auth, c client.Client) client.Client {
return &authWrapper{Client: c, auth: a}
}
type authWrapper struct {
client.Client
auth func() auth.Auth
}
func (a *authWrapper) Call(ctx context.Context, req client.Request, rsp interface{}, opts ...client.CallOption) error {
// parse the options
var options client.CallOptions
for _, o := range opts {
o(&options)
}
// check to see if the authorization header has already been set.
// We dont't override the header unless the ServiceToken option has
// been specified or the header wasn't provided
if _, ok := metadata.Get(ctx, "Authorization"); ok && !options.ServiceToken {
return a.Client.Call(ctx, req, rsp, opts...)
}
// if auth is nil we won't be able to get an access token, so we execute
// the request without one.
aa := a.auth()
if aa == nil {
return a.Client.Call(ctx, req, rsp, opts...)
}
// set the namespace header if it has not been set (e.g. on a service to service request)
if _, ok := metadata.Get(ctx, headers.Namespace); !ok {
ctx = metadata.Set(ctx, headers.Namespace, aa.Options().Namespace)
}
// check to see if we have a valid access token
aaOpts := aa.Options()
if aaOpts.Token != nil && !aaOpts.Token.Expired() {
ctx = metadata.Set(ctx, "Authorization", auth.BearerScheme+aaOpts.Token.AccessToken)
return a.Client.Call(ctx, req, rsp, opts...)
}
// call without an auth token
return a.Client.Call(ctx, req, rsp, opts...)
}