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wrapper.go
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wrapper.go
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// 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.
//
// Original source: github.com/micro/micro/v3/metrics/wrapper/metrics_wrapper.go
package wrapper
import (
"time"
"context"
"github.com/micro/micro/v3/service/metrics"
"github.com/micro/micro/v3/service/server"
)
// Wrapper provides a HandlerFunc for metrics.Reporter implementations:
type Wrapper struct {
reporter metrics.Reporter
}
// New returns a *Wrapper configured with the given metrics.Reporter:
func New(reporter metrics.Reporter) *Wrapper {
return &Wrapper{
reporter: reporter,
}
}
// HandlerFunc instruments handlers registered to a service:
func (w *Wrapper) HandlerFunc(handlerFunction server.HandlerFunc) server.HandlerFunc {
return func(ctx context.Context, req server.Request, rsp interface{}) error {
// Build some tags to describe the call:
tags := metrics.Tags{
"method": req.Method(),
}
// Start the clock:
callTime := time.Now()
// Run the handlerFunction:
err := handlerFunction(ctx, req, rsp)
// Add a result tag:
if err != nil {
tags["result"] = "failure"
} else {
tags["result"] = "success"
}
// Instrument the result (if the DefaultClient has been configured):
w.reporter.Timing("service.handler", time.Since(callTime), tags)
return err
}
}