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// Copyright 2019 The Go Cloud Development Kit 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
//
// https://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 oc supports OpenCensus tracing and metrics for the Go Cloud Development Kit.
package oc
import (
"fmt"
"go.opencensus.io/plugin/ocgrpc"
"go.opencensus.io/stats"
"go.opencensus.io/stats/view"
"go.opencensus.io/tag"
)
// LatencyMeasure returns the measure for method call latency used
// by Go CDK APIs.
func LatencyMeasure(pkg string) *stats.Float64Measure {
return stats.Float64(
pkg+"/latency",
"Latency of method call",
stats.UnitMilliseconds)
}
// Tag keys used for the standard Go CDK views.
var (
MethodKey = mustKey("gocdk_method")
StatusKey = mustKey("gocdk_status")
ProviderKey = mustKey("gocdk_provider")
)
func mustKey(name string) tag.Key {
k, err := tag.NewKey(name)
if err != nil {
panic(fmt.Sprintf("tag.NewKey(%q): %v", name, err))
}
return k
}
// Views returns the views supported by Go CDK APIs.
func Views(pkg string, latencyMeasure *stats.Float64Measure) []*view.View {
return []*view.View{
{
Name: pkg + "/completed_calls",
Measure: latencyMeasure,
Description: "Count of method calls by provider, method and status.",
TagKeys: []tag.Key{ProviderKey, MethodKey, StatusKey},
Aggregation: view.Count(),
},
{
Name: pkg + "/latency",
Measure: latencyMeasure,
Description: "Distribution of method latency, by provider and method.",
TagKeys: []tag.Key{ProviderKey, MethodKey},
Aggregation: ocgrpc.DefaultMillisecondsDistribution,
},
}
}
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