micro/tracer/context.go
Vasiliy Tolstov 14c97d59c1 many improvements with options and noop stuff
* add many options helpers
* fix noop client to allow publish messages to topic in broker
* fix noop server to allow registering in registry
* fix noop server to allow subscribe to topic in broker
* fix new service initialization

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>
2020-10-16 09:38:57 +03:00

37 lines
899 B
Go

// Package trace provides an interface for distributed tracing
package tracer
import (
"context"
"github.com/unistack-org/micro/v3/metadata"
)
const (
traceIDKey = "Micro-Trace-Id"
spanIDKey = "Micro-Span-Id"
)
// FromContext returns a span from context
func FromContext(ctx context.Context) (traceID string, parentSpanID string, isFound bool) {
traceID, traceOk := metadata.Get(ctx, traceIDKey)
microID, microOk := metadata.Get(ctx, "Micro-Id")
if !traceOk && !microOk {
isFound = false
return
}
if !traceOk {
traceID = microID
}
parentSpanID, ok := metadata.Get(ctx, spanIDKey)
return traceID, parentSpanID, ok
}
// NewContext saves the trace and span ids in the context
func NewContext(ctx context.Context, traceID, parentSpanID string) context.Context {
return metadata.MergeContext(ctx, map[string]string{
traceIDKey: traceID,
spanIDKey: parentSpanID,
}, true)
}