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tracing.go
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tracing.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 tracing provides distributed tracing services to Trickster
package tracing
import (
"net/http"
"github.com/tricksterproxy/trickster/pkg/tracing/options"
"go.opentelemetry.io/otel/codes"
"go.opentelemetry.io/otel/label"
"go.opentelemetry.io/otel/trace"
)
// FlusherFunc defines a function used to Flush a Tracer
type FlusherFunc func()
// Tracer is a Tracer object used by Trickster
type Tracer struct {
trace.Tracer
Name string
Flusher FlusherFunc
Options *options.Options
}
// Tracers is a map of *Tracer objects
type Tracers map[string]*Tracer
// Tags represents a collection of Tags
type Tags map[string]string
// HTTPToCode translates an HTTP status code into a GRPC code
func HTTPToCode(status int) codes.Code {
switch {
case status < http.StatusBadRequest:
return codes.Ok
default:
return codes.Error
}
}
// Merge merges t2, when not nil, into t
func (t Tags) Merge(t2 Tags) {
if t2 == nil {
return
}
for k, v := range t2 {
t[k] = v
}
}
// MergeAttr merges the provided attributes into the Tags map
func (t Tags) MergeAttr(attr []label.KeyValue) {
if len(attr) == 0 {
return
}
for _, v := range attr {
t[string(v.Key)] = v.Value.AsString()
}
}
// ToAttr returns the Tags map as an Attributes List
func (t Tags) ToAttr() []label.KeyValue {
attr := make([]label.KeyValue, len(t))
i := 0
for k, v := range t {
attr[i] = label.String(k, v)
i++
}
return attr
}