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opentelemetry-go/sdk/trace/provider.go

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// Copyright The OpenTelemetry Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package trace // import "go.opentelemetry.io/otel/sdk/trace"
import (
"context"
"sync"
"sync/atomic"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/trace"
export "go.opentelemetry.io/otel/sdk/export/trace"
"go.opentelemetry.io/otel/sdk/instrumentation"
"go.opentelemetry.io/otel/sdk/resource"
)
const (
defaultTracerName = "go.opentelemetry.io/otel/sdk/tracer"
)
// TODO (MrAlias): unify this API option design:
// https://github.com/open-telemetry/opentelemetry-go/issues/536
// TracerProviderConfig
type TracerProviderConfig struct {
processors []SpanProcessor
config Config
}
type TracerProviderOption func(*TracerProviderConfig)
type TracerProvider struct {
mu sync.Mutex
namedTracer map[instrumentation.Library]*tracer
spanProcessors atomic.Value
config atomic.Value // access atomically
}
var _ trace.TracerProvider = &TracerProvider{}
// NewTracerProvider creates an instance of trace provider. Optional
// parameter configures the provider with common options applicable
// to all tracer instances that will be created by this provider.
func NewTracerProvider(opts ...TracerProviderOption) *TracerProvider {
o := &TracerProviderConfig{}
for _, opt := range opts {
opt(o)
}
tp := &TracerProvider{
namedTracer: make(map[instrumentation.Library]*tracer),
}
tp.config.Store(&Config{
DefaultSampler: ParentBased(AlwaysSample()),
IDGenerator: defaultIDGenerator(),
MaxAttributesPerSpan: DefaultMaxAttributesPerSpan,
MaxEventsPerSpan: DefaultMaxEventsPerSpan,
MaxLinksPerSpan: DefaultMaxLinksPerSpan,
})
for _, sp := range o.processors {
tp.RegisterSpanProcessor(sp)
}
tp.ApplyConfig(o.config)
return tp
}
// Tracer with the given name. If a tracer for the given name does not exist,
// it is created first. If the name is empty, DefaultTracerName is used.
func (p *TracerProvider) Tracer(name string, opts ...trace.TracerOption) trace.Tracer {
c := trace.NewTracerConfig(opts...)
p.mu.Lock()
defer p.mu.Unlock()
if name == "" {
name = defaultTracerName
}
il := instrumentation.Library{
Name: name,
Version: c.InstrumentationVersion,
}
t, ok := p.namedTracer[il]
if !ok {
t = &tracer{
provider: p,
instrumentationLibrary: il,
}
p.namedTracer[il] = t
}
return t
}
// RegisterSpanProcessor adds the given SpanProcessor to the list of SpanProcessors
func (p *TracerProvider) RegisterSpanProcessor(s SpanProcessor) {
p.mu.Lock()
defer p.mu.Unlock()
new := spanProcessorStates{}
if old, ok := p.spanProcessors.Load().(spanProcessorStates); ok {
new = append(new, old...)
}
newSpanSync := &spanProcessorState{
sp: s,
state: &sync.Once{},
}
new = append(new, newSpanSync)
p.spanProcessors.Store(new)
}
// UnregisterSpanProcessor removes the given SpanProcessor from the list of SpanProcessors
func (p *TracerProvider) UnregisterSpanProcessor(s SpanProcessor) {
p.mu.Lock()
defer p.mu.Unlock()
new := spanProcessorStates{}
old, ok := p.spanProcessors.Load().(spanProcessorStates)
if !ok || len(old) == 0 {
return
}
new = append(new, old...)
// stop the span processor if it is started and remove it from the list
var stopOnce *spanProcessorState
var idx int
for i, sps := range new {
if sps.sp == s {
stopOnce = sps
idx = i
}
}
if stopOnce != nil {
stopOnce.state.Do(func() {
if err := s.Shutdown(context.Background()); err != nil {
otel.Handle(err)
}
})
}
if len(new) > 1 {
copy(new[idx:], new[idx+1:])
}
new[len(new)-1] = nil
new = new[:len(new)-1]
p.spanProcessors.Store(new)
}
// ApplyConfig changes the configuration of the provider.
// If a field in the configuration is empty or nil then its original value is preserved.
func (p *TracerProvider) ApplyConfig(cfg Config) {
p.mu.Lock()
defer p.mu.Unlock()
c := *p.config.Load().(*Config)
if cfg.DefaultSampler != nil {
c.DefaultSampler = cfg.DefaultSampler
}
if cfg.IDGenerator != nil {
c.IDGenerator = cfg.IDGenerator
}
if cfg.MaxEventsPerSpan > 0 {
c.MaxEventsPerSpan = cfg.MaxEventsPerSpan
}
if cfg.MaxAttributesPerSpan > 0 {
c.MaxAttributesPerSpan = cfg.MaxAttributesPerSpan
}
if cfg.MaxLinksPerSpan > 0 {
c.MaxLinksPerSpan = cfg.MaxLinksPerSpan
}
c.Resource = cfg.Resource
if c.Resource == nil {
c.Resource = resource.Default()
}
p.config.Store(&c)
}
// Shutdown shuts down the span processors in the order they were registered
func (p *TracerProvider) Shutdown(ctx context.Context) error {
spss, ok := p.spanProcessors.Load().(spanProcessorStates)
if !ok || len(spss) == 0 {
return nil
}
for _, sps := range spss {
sps.state.Do(func() {
if err := sps.sp.Shutdown(ctx); err != nil {
otel.Handle(err)
}
})
}
return nil
}
// WithSyncer registers the exporter with the TracerProvider using a
// SimpleSpanProcessor.
func WithSyncer(e export.SpanExporter) TracerProviderOption {
return WithSpanProcessor(NewSimpleSpanProcessor(e))
}
// WithBatcher registers the exporter with the TracerProvider using a
// BatchSpanProcessor configured with the passed opts.
func WithBatcher(e export.SpanExporter, opts ...BatchSpanProcessorOption) TracerProviderOption {
return WithSpanProcessor(NewBatchSpanProcessor(e, opts...))
}
// WithSpanProcessor registers the SpanProcessor with a TracerProvider.
func WithSpanProcessor(sp SpanProcessor) TracerProviderOption {
return func(opts *TracerProviderConfig) {
opts.processors = append(opts.processors, sp)
}
}
// WithConfig option sets the configuration to provider.
func WithConfig(config Config) TracerProviderOption {
return func(opts *TracerProviderConfig) {
opts.config = config
}
}
// WithResource option attaches a resource to the provider.
// The resource is added to the span when it is started.
func WithResource(r *resource.Resource) TracerProviderOption {
return func(opts *TracerProviderConfig) {
opts.config.Resource = r
}
}
// WithIDGenerator option registers an IDGenerator with the TracerProvider.
func WithIDGenerator(g IDGenerator) TracerProviderOption {
return func(opts *TracerProviderConfig) {
opts.config.IDGenerator = g
}
}