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metrics.go
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metrics.go
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// Copyright 2022 Google 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 codegen
import (
"time"
"github.com/ServiceWeaver/weaver/metrics"
)
// Names of automatically populated metrics.
const (
MethodCountsName = "serviceweaver_method_count"
MethodErrorsName = "serviceweaver_method_error_count"
MethodLatenciesName = "serviceweaver_method_latency_micros"
MethodBytesRequestName = "serviceweaver_method_bytes_request"
MethodBytesReplyName = "serviceweaver_method_bytes_reply"
)
var (
// The following metrics are automatically populated for the user.
methodCounts = metrics.NewCounterMap[MethodLabels](
MethodCountsName,
"Count of Service Weaver component method invocations",
)
methodErrors = metrics.NewCounterMap[MethodLabels](
MethodErrorsName,
"Count of Service Weaver component method invocations that result in an error",
)
methodLatencies = metrics.NewHistogramMap[MethodLabels](
MethodLatenciesName,
"Duration, in microseconds, of Service Weaver component method execution",
metrics.NonNegativeBuckets,
)
methodBytesRequest = metrics.NewHistogramMap[MethodLabels](
MethodBytesRequestName,
"Number of bytes in Service Weaver component method requests",
metrics.NonNegativeBuckets,
)
methodBytesReply = metrics.NewHistogramMap[MethodLabels](
MethodBytesReplyName,
"Number of bytes in Service Weaver component method replies",
metrics.NonNegativeBuckets,
)
)
type MethodLabels struct {
Caller string // full calling component name
Component string // full callee component name
Method string // callee component method's name
Remote bool // Is this a remote call?
}
// MethodMetrics contains metrics for a single Service Weaver component method.
type MethodMetrics struct {
remote bool
count *metrics.Counter // See MethodCounts.
errorCount *metrics.Counter // See MethodErrors.
latency *metrics.Histogram // See MethodLatencies.
bytesRequest *metrics.Histogram // See MethodBytesRequest.
bytesReply *metrics.Histogram // See MethodBytesReply.
}
// MethodMetricsFor returns metrics for the specified method.
func MethodMetricsFor(labels MethodLabels) *MethodMetrics {
return &MethodMetrics{
remote: labels.Remote,
count: methodCounts.Get(labels),
errorCount: methodErrors.Get(labels),
latency: methodLatencies.Get(labels),
bytesRequest: methodBytesRequest.Get(labels),
bytesReply: methodBytesReply.Get(labels),
}
}
// MethodCallHandle holds information needed to finalize metric
// updates for a method call.
type MethodCallHandle struct {
start time.Time
}
// Begin starts metric update recording for a call to method m.
func (m *MethodMetrics) Begin() MethodCallHandle {
return MethodCallHandle{time.Now()}
}
// End ends metric update recording for a call to method m.
func (m *MethodMetrics) End(h MethodCallHandle, failed bool, requestBytes, replyBytes int) {
latency := time.Since(h.start).Microseconds()
m.count.Inc()
if failed {
m.errorCount.Inc()
}
m.latency.Put(float64(latency))
if m.remote {
m.bytesRequest.Put(float64(requestBytes))
m.bytesReply.Put(float64(replyBytes))
}
}