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117 lines
2.9 KiB
117 lines
2.9 KiB
package metrics
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import (
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"context"
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"strconv"
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"time"
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"github.com/go-kratos/kratos/v2/errors"
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"github.com/go-kratos/kratos/v2/metrics"
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"github.com/go-kratos/kratos/v2/middleware"
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"github.com/go-kratos/kratos/v2/transport/grpc"
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"github.com/go-kratos/kratos/v2/transport/http"
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"github.com/gorilla/mux"
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)
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// Option is metrics option.
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type Option func(*options)
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// WithRequests with requests counter.
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func WithRequests(c metrics.Counter) Option {
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return func(o *options) {
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o.requests = c
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}
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}
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// WithSeconds with seconds histogram.
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func WithSeconds(c metrics.Observer) Option {
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return func(o *options) {
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o.seconds = c
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}
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}
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type options struct {
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// counter: <kind>_<client/server>_requests_code_total{method, path, code}
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requests metrics.Counter
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// histogram: <kind>_<client/server>_requests_seconds_bucket{method, path}
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seconds metrics.Observer
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}
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// Server is middleware server-side metrics.
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func Server(opts ...Option) middleware.Middleware {
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options := options{}
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for _, o := range opts {
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o(&options)
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}
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return func(handler middleware.Handler) middleware.Handler {
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return func(ctx context.Context, req interface{}) (interface{}, error) {
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var (
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method string
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path string
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code uint32
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)
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if info, ok := grpc.FromServerContext(ctx); ok {
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method = "POST"
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path = info.FullMethod
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} else if info, ok := http.FromServerContext(ctx); ok {
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req := info.Request.WithContext(ctx)
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method = req.Method
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if route := mux.CurrentRoute(req); route != nil {
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// /path/123 -> /path/{id}
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path, _ = route.GetPathTemplate()
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} else {
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path = req.RequestURI
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}
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}
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startTime := time.Now()
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reply, err := handler(ctx, req)
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if err != nil {
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code = uint32(errors.Code(err))
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}
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if options.requests != nil {
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options.requests.With(method, path, strconv.Itoa(int(code))).Inc()
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}
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if options.seconds != nil {
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options.seconds.With(method, path).Observe(time.Since(startTime).Seconds())
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}
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return reply, err
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}
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}
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}
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// Client is middleware client-side metrics.
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func Client(opts ...Option) middleware.Middleware {
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options := options{}
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for _, o := range opts {
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o(&options)
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}
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return func(handler middleware.Handler) middleware.Handler {
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return func(ctx context.Context, req interface{}) (interface{}, error) {
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var (
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method string
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path string
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code uint32
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)
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if info, ok := grpc.FromClientContext(ctx); ok {
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method = "POST"
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path = info.FullMethod
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} else if info, ok := http.FromClientContext(ctx); ok {
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method = info.Request.Method
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path = info.Request.RequestURI
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}
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startTime := time.Now()
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reply, err := handler(ctx, req)
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if err != nil {
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code = uint32(errors.Code(err))
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}
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if options.requests != nil {
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options.requests.With(method, path, strconv.Itoa(int(code))).Inc()
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}
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if options.seconds != nil {
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options.seconds.With(method, path).Observe(time.Since(startTime).Seconds())
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}
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return reply, err
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}
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}
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}
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