/
provider.go
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/
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 (
"sync"
"sync/atomic"
export "go.opentelemetry.io/otel/sdk/export/trace"
"go.opentelemetry.io/otel/sdk/instrumentation"
"go.opentelemetry.io/otel/sdk/resource"
apitrace "go.opentelemetry.io/otel/api/trace"
)
const (
defaultTracerName = "go.opentelemetry.io/otel/sdk/tracer"
)
// batcher contains export.SpanBatcher and its options.
type batcher struct {
b export.SpanBatcher
opts []BatchSpanProcessorOption
}
// ProviderOptions
type ProviderOptions struct {
syncers []export.SpanSyncer
batchers []batcher
config Config
}
type ProviderOption func(*ProviderOptions)
type Provider struct {
mu sync.Mutex
namedTracer map[instrumentation.Library]*tracer
spanProcessors atomic.Value
config atomic.Value // access atomically
}
var _ apitrace.Provider = &Provider{}
// NewProvider 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 NewProvider(opts ...ProviderOption) (*Provider, error) {
o := &ProviderOptions{}
for _, opt := range opts {
opt(o)
}
tp := &Provider{
namedTracer: make(map[instrumentation.Library]*tracer),
}
tp.config.Store(&Config{
DefaultSampler: ParentSample(AlwaysSample()),
IDGenerator: defIDGenerator(),
MaxAttributesPerSpan: DefaultMaxAttributesPerSpan,
MaxEventsPerSpan: DefaultMaxEventsPerSpan,
MaxLinksPerSpan: DefaultMaxLinksPerSpan,
})
for _, syncer := range o.syncers {
ssp := NewSimpleSpanProcessor(syncer)
tp.RegisterSpanProcessor(ssp)
}
for _, batcher := range o.batchers {
bsp, err := NewBatchSpanProcessor(batcher.b, batcher.opts...)
if err != nil {
return nil, err
}
tp.RegisterSpanProcessor(bsp)
}
tp.ApplyConfig(o.config)
return tp, nil
}
// 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 *Provider) Tracer(name string, opts ...apitrace.TracerOption) apitrace.Tracer {
c := new(apitrace.TracerConfig)
for _, o := range opts {
o(c)
}
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 *Provider) RegisterSpanProcessor(s SpanProcessor) {
p.mu.Lock()
defer p.mu.Unlock()
new := make(spanProcessorMap)
if old, ok := p.spanProcessors.Load().(spanProcessorMap); ok {
for k, v := range old {
new[k] = v
}
}
new[s] = &sync.Once{}
p.spanProcessors.Store(new)
}
// UnregisterSpanProcessor removes the given SpanProcessor from the list of SpanProcessors
func (p *Provider) UnregisterSpanProcessor(s SpanProcessor) {
mu.Lock()
defer mu.Unlock()
new := make(spanProcessorMap)
if old, ok := p.spanProcessors.Load().(spanProcessorMap); ok {
for k, v := range old {
new[k] = v
}
}
if stopOnce, ok := new[s]; ok && stopOnce != nil {
stopOnce.Do(func() {
s.Shutdown()
})
}
delete(new, s)
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 *Provider) 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
}
if cfg.Resource != nil {
c.Resource = cfg.Resource
}
p.config.Store(&c)
}
// WithSyncer options appends the syncer to the existing list of Syncers.
// This option can be used multiple times.
// The Syncers are wrapped into SimpleSpanProcessors and registered
// with the provider.
func WithSyncer(syncer export.SpanSyncer) ProviderOption {
return func(opts *ProviderOptions) {
opts.syncers = append(opts.syncers, syncer)
}
}
// WithBatcher options appends the batcher to the existing list of Batchers.
// This option can be used multiple times.
// The Batchers are wrapped into BatchedSpanProcessors and registered
// with the provider.
func WithBatcher(b export.SpanBatcher, bopts ...BatchSpanProcessorOption) ProviderOption {
return func(opts *ProviderOptions) {
opts.batchers = append(opts.batchers, batcher{b, bopts})
}
}
// WithConfig option sets the configuration to provider.
func WithConfig(config Config) ProviderOption {
return func(opts *ProviderOptions) {
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) ProviderOption {
return func(opts *ProviderOptions) {
opts.config.Resource = r
}
}