/
instrumenting.go
73 lines (66 loc) · 2.35 KB
/
instrumenting.go
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package kitworker
import (
"encoding/json"
"fmt"
"time"
"github.com/go-kit/kit/endpoint"
"github.com/go-kit/kit/log"
"github.com/go-kit/kit/metrics"
"golang.org/x/net/context"
)
// DefaultMiddlewares provides bare bones for default middlewares with
// requestLatency, requestCount and requestLogging
func DefaultMiddlewares(method string, requestCount metrics.Counter, requestLatency metrics.Histogram, logger log.Logger) endpoint.Middleware {
return endpoint.Chain(
RequestLatencyMiddleware(method, requestLatency),
RequestCountMiddleware(method, requestCount),
RequestLoggingMiddleware(method, logger),
)
}
// RequestCountMiddleware prepares a request counter endpoint.Middleware for
// package wide usage
func RequestCountMiddleware(method string, requestCount metrics.Counter) endpoint.Middleware {
return func(next endpoint.Endpoint) endpoint.Endpoint {
return func(ctx context.Context, request interface{}) (response interface{}, err error) {
defer func() {
requestCount.With("method", method).With("error", fmt.Sprintf("%v", err)).Add(1)
}()
response, err = next(ctx, request)
return
}
}
}
// RequestLatencyMiddleware prepares a request latency calculator
// endpoint.Middleware for package wide usage
func RequestLatencyMiddleware(method string, requestLatency metrics.Histogram) endpoint.Middleware {
return func(next endpoint.Endpoint) endpoint.Endpoint {
return func(ctx context.Context, request interface{}) (response interface{}, err error) {
defer func(begin time.Time) {
requestLatency.With("method", method).With("error", fmt.Sprintf("%v", err)).Observe(float64(time.Since(begin)))
}(time.Now())
response, err = next(ctx, request)
return
}
}
}
// RequestLoggingMiddleware prepares a request logger endpoint.Middleware for
// package wide usage
func RequestLoggingMiddleware(method string, logger log.Logger) endpoint.Middleware {
return func(next endpoint.Endpoint) endpoint.Endpoint {
return func(ctx context.Context, request interface{}) (response interface{}, err error) {
defer func(begin time.Time) {
input, _ := json.Marshal(request)
output, _ := json.Marshal(response)
_ = logger.Log(
"method", method,
"input", string(input),
"output", string(output),
"err", err,
"took", time.Since(begin),
)
}(time.Now())
response, err = next(ctx, request)
return
}
}
}