/
registration.go
102 lines (85 loc) · 2.81 KB
/
registration.go
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/**
* Copyright 2018 Comcast Cable Communications Management, LLC
* 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 registration registers configured tracers for use with handlers
package registration
import (
"errors"
"fmt"
"go.opentelemetry.io/otel/api/trace"
"github.com/Comcast/trickster/internal/config"
"github.com/Comcast/trickster/internal/util/log"
"github.com/Comcast/trickster/internal/util/tracing"
)
// Flushers represents a slice of Flusher functions for the configured Tracers
type Flushers []func()
// RegisterAll registers all Tracers in the provided configuration, and returns
// their Flushers
func RegisterAll(cfg *config.TricksterConfig) (Flushers, error) {
if cfg == nil {
return nil, errors.New("no config provided")
}
if cfg.Origins == nil {
return nil, errors.New("no origins provided")
}
flushers := make(Flushers, 0, len(cfg.Origins))
activeTracers := make(map[string]*config.TracingConfig)
for _, oc := range cfg.Origins {
if oc != nil {
tc := oc.TracingConfig
if tc == nil {
continue
}
if tc.Implementation == "" {
continue
}
if _, ok := tracing.TracerImplementations[tc.Implementation]; !ok {
return nil, fmt.Errorf("invalid tracing implementation [%s] for tracing config [%s]", tc.Implementation, oc.TracingConfigName)
}
if _, ok := activeTracers[oc.TracingConfigName]; !ok {
tracer, flusher, err := Init(tc)
if err != nil {
return nil, err
}
flushers = append(flushers, flusher)
tc.Tracer = tracer
tc.Name = oc.TracingConfigName
activeTracers[oc.TracingConfigName] = tc
}
}
}
return flushers, nil
}
// Init initializes tracing and returns a function to flush the tracer. Flush should be called on server shutdown.
func Init(cfg *config.TracingConfig) (trace.Tracer, func(), error) {
if cfg == nil {
log.Info(
"nil tracing config, using noop tracer", nil,
)
return trace.NoopTracer{}, func() {}, nil
}
log.Debug(
"Trace Init",
log.Pairs{
"Implementation": cfg.Implementation,
"Collector": cfg.CollectorEndpoint,
"Type": tracing.TracerImplementations[cfg.Implementation],
},
)
tracer, flusher, _, err := tracing.SetTracer(
tracing.TracerImplementations[cfg.Implementation],
tracing.TraceExporters[cfg.Exporter],
cfg.CollectorEndpoint,
cfg.SampleRate,
)
return tracer, flusher, err
}