Add tracing to settings service.
This adds tracing to the settings service. It uses the otelchi package and passes the tracing provider to the grpc and http servers.
This commit is contained in:
Daniël Franke
+201
@@ -0,0 +1,201 @@
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+4
@@ -0,0 +1,4 @@
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.PHONY: *
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||||
test:
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||||
go test -v ./...
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+27
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# otelchi
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||||
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[](https://github.com/riandyrn/otelchi/actions/workflows/ci.yaml)
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||||
[](https://goreportcard.com/report/github.com/riandyrn/otelchi)
|
||||
[](https://pkg.go.dev/mod/github.com/riandyrn/otelchi)
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||||
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OpenTelemetry instrumentation for [go-chi/chi](https://github.com/go-chi/chi).
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Essentialy this is adaptation from [otelmux](https://github.com/open-telemetry/opentelemetry-go-contrib/tree/main/instrumentation/github.com/gorilla/mux/otelmux) but instead using `gorilla/mux`, we use `go-chi/chi`.
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Currently it could only instrument traces.
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Contributions are welcomed!
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## Install
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||||
|
||||
```bash
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$ go get github.com/riandyrn/otelchi
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```
|
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|
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## Examples
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||||
|
||||
See [examples](./examples) for details.
|
||||
|
||||
## Why Port This?
|
||||
|
||||
I was planning to make this project as part of Open Telemetry Go instrumentation project. However based on [this comment](https://github.com/open-telemetry/opentelemetry-go-contrib/pull/986#issuecomment-941280855) they no longer accept new instrumentation. This is why I maintain this project here.
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+82
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package otelchi
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import (
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"net/http"
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"github.com/go-chi/chi/v5"
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"go.opentelemetry.io/otel/propagation"
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oteltrace "go.opentelemetry.io/otel/trace"
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)
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// config is used to configure the mux middleware.
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type config struct {
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TracerProvider oteltrace.TracerProvider
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Propagators propagation.TextMapPropagator
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ChiRoutes chi.Routes
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RequestMethodInSpanName bool
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Filter func(r *http.Request) bool
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}
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|
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// Option specifies instrumentation configuration options.
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type Option interface {
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||||
apply(*config)
|
||||
}
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||||
|
||||
type optionFunc func(*config)
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|
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func (o optionFunc) apply(c *config) {
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o(c)
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}
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|
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// WithPropagators specifies propagators to use for extracting
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// information from the HTTP requests. If none are specified, global
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// ones will be used.
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func WithPropagators(propagators propagation.TextMapPropagator) Option {
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return optionFunc(func(cfg *config) {
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cfg.Propagators = propagators
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})
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}
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|
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// WithTracerProvider specifies a tracer provider to use for creating a tracer.
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// If none is specified, the global provider is used.
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func WithTracerProvider(provider oteltrace.TracerProvider) Option {
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return optionFunc(func(cfg *config) {
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cfg.TracerProvider = provider
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})
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}
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|
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// WithChiRoutes specified the routes that being used by application. Its main
|
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// purpose is to provide route pattern as span name during span creation. If this
|
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// option is not set, by default the span will be given name at the end of span
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// execution. For some people, this behavior is not desirable since they want
|
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// to override the span name on underlying handler. By setting this option, it
|
||||
// is possible for them to override the span name.
|
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func WithChiRoutes(routes chi.Routes) Option {
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return optionFunc(func(cfg *config) {
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cfg.ChiRoutes = routes
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})
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}
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|
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// WithRequestMethodInSpanName is used for adding http request method to span name.
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// While this is not necessary for vendors that properly implemented the tracing
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// specs (e.g Jaeger, AWS X-Ray, etc...), but for other vendors such as Elastic
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||||
// and New Relic this might be helpful.
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//
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// See following threads for details:
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//
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// - https://github.com/riandyrn/otelchi/pull/3#issuecomment-1005883910
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// - https://github.com/riandyrn/otelchi/issues/6#issuecomment-1034461912
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func WithRequestMethodInSpanName(isActive bool) Option {
|
||||
return optionFunc(func(cfg *config) {
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cfg.RequestMethodInSpanName = isActive
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})
|
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}
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|
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// WithFilter is used for filtering request that should not be traced.
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// This is useful for filtering health check request, etc.
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// A Filter must return true if the request should be traced.
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func WithFilter(filter func(r *http.Request) bool) Option {
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return optionFunc(func(cfg *config) {
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cfg.Filter = filter
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})
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}
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+181
@@ -0,0 +1,181 @@
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package otelchi
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import (
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"net/http"
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"sync"
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||||
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"github.com/felixge/httpsnoop"
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||||
"github.com/go-chi/chi/v5"
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||||
|
||||
"go.opentelemetry.io/otel"
|
||||
"go.opentelemetry.io/otel/propagation"
|
||||
|
||||
otelcontrib "go.opentelemetry.io/contrib"
|
||||
semconv "go.opentelemetry.io/otel/semconv/v1.4.0"
|
||||
oteltrace "go.opentelemetry.io/otel/trace"
|
||||
)
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|
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const (
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||||
tracerName = "github.com/riandyrn/otelchi"
|
||||
)
|
||||
|
||||
// Middleware sets up a handler to start tracing the incoming
|
||||
// requests. The serverName parameter should describe the name of the
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||||
// (virtual) server handling the request.
|
||||
func Middleware(serverName string, opts ...Option) func(next http.Handler) http.Handler {
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cfg := config{}
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||||
for _, opt := range opts {
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||||
opt.apply(&cfg)
|
||||
}
|
||||
if cfg.TracerProvider == nil {
|
||||
cfg.TracerProvider = otel.GetTracerProvider()
|
||||
}
|
||||
tracer := cfg.TracerProvider.Tracer(
|
||||
tracerName,
|
||||
oteltrace.WithInstrumentationVersion(otelcontrib.SemVersion()),
|
||||
)
|
||||
if cfg.Propagators == nil {
|
||||
cfg.Propagators = otel.GetTextMapPropagator()
|
||||
}
|
||||
return func(handler http.Handler) http.Handler {
|
||||
return traceware{
|
||||
serverName: serverName,
|
||||
tracer: tracer,
|
||||
propagators: cfg.Propagators,
|
||||
handler: handler,
|
||||
chiRoutes: cfg.ChiRoutes,
|
||||
reqMethodInSpanName: cfg.RequestMethodInSpanName,
|
||||
filter: cfg.Filter,
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
type traceware struct {
|
||||
serverName string
|
||||
tracer oteltrace.Tracer
|
||||
propagators propagation.TextMapPropagator
|
||||
handler http.Handler
|
||||
chiRoutes chi.Routes
|
||||
reqMethodInSpanName bool
|
||||
filter func(r *http.Request) bool
|
||||
}
|
||||
|
||||
type recordingResponseWriter struct {
|
||||
writer http.ResponseWriter
|
||||
written bool
|
||||
status int
|
||||
}
|
||||
|
||||
var rrwPool = &sync.Pool{
|
||||
New: func() interface{} {
|
||||
return &recordingResponseWriter{}
|
||||
},
|
||||
}
|
||||
|
||||
func getRRW(writer http.ResponseWriter) *recordingResponseWriter {
|
||||
rrw := rrwPool.Get().(*recordingResponseWriter)
|
||||
rrw.written = false
|
||||
rrw.status = 0
|
||||
rrw.writer = httpsnoop.Wrap(writer, httpsnoop.Hooks{
|
||||
Write: func(next httpsnoop.WriteFunc) httpsnoop.WriteFunc {
|
||||
return func(b []byte) (int, error) {
|
||||
if !rrw.written {
|
||||
rrw.written = true
|
||||
rrw.status = http.StatusOK
|
||||
}
|
||||
return next(b)
|
||||
}
|
||||
},
|
||||
WriteHeader: func(next httpsnoop.WriteHeaderFunc) httpsnoop.WriteHeaderFunc {
|
||||
return func(statusCode int) {
|
||||
if !rrw.written {
|
||||
rrw.written = true
|
||||
rrw.status = statusCode
|
||||
}
|
||||
next(statusCode)
|
||||
}
|
||||
},
|
||||
})
|
||||
return rrw
|
||||
}
|
||||
|
||||
func putRRW(rrw *recordingResponseWriter) {
|
||||
rrw.writer = nil
|
||||
rrwPool.Put(rrw)
|
||||
}
|
||||
|
||||
// ServeHTTP implements the http.Handler interface. It does the actual
|
||||
// tracing of the request.
|
||||
func (tw traceware) ServeHTTP(w http.ResponseWriter, r *http.Request) {
|
||||
// skip if filter returns false
|
||||
if tw.filter != nil && !tw.filter(r) {
|
||||
tw.handler.ServeHTTP(w, r)
|
||||
return
|
||||
}
|
||||
|
||||
// extract tracing header using propagator
|
||||
ctx := tw.propagators.Extract(r.Context(), propagation.HeaderCarrier(r.Header))
|
||||
// create span, based on specification, we need to set already known attributes
|
||||
// when creating the span, the only thing missing here is HTTP route pattern since
|
||||
// in go-chi/chi route pattern could only be extracted once the request is executed
|
||||
// check here for details:
|
||||
//
|
||||
// https://github.com/go-chi/chi/issues/150#issuecomment-278850733
|
||||
//
|
||||
// if we have access to chi routes, we could extract the route pattern beforehand.
|
||||
spanName := ""
|
||||
routePattern := ""
|
||||
if tw.chiRoutes != nil {
|
||||
rctx := chi.NewRouteContext()
|
||||
if tw.chiRoutes.Match(rctx, r.Method, r.URL.Path) {
|
||||
routePattern = rctx.RoutePattern()
|
||||
spanName = addPrefixToSpanName(tw.reqMethodInSpanName, r.Method, routePattern)
|
||||
}
|
||||
}
|
||||
|
||||
ctx, span := tw.tracer.Start(
|
||||
ctx, spanName,
|
||||
oteltrace.WithAttributes(semconv.NetAttributesFromHTTPRequest("tcp", r)...),
|
||||
oteltrace.WithAttributes(semconv.EndUserAttributesFromHTTPRequest(r)...),
|
||||
oteltrace.WithAttributes(semconv.HTTPServerAttributesFromHTTPRequest(tw.serverName, routePattern, r)...),
|
||||
oteltrace.WithSpanKind(oteltrace.SpanKindServer),
|
||||
)
|
||||
defer span.End()
|
||||
|
||||
// get recording response writer
|
||||
rrw := getRRW(w)
|
||||
defer putRRW(rrw)
|
||||
|
||||
// execute next http handler
|
||||
r = r.WithContext(ctx)
|
||||
tw.handler.ServeHTTP(rrw.writer, r)
|
||||
|
||||
// set span name & http route attribute if necessary
|
||||
if len(routePattern) == 0 {
|
||||
routePattern = chi.RouteContext(r.Context()).RoutePattern()
|
||||
span.SetAttributes(semconv.HTTPRouteKey.String(routePattern))
|
||||
|
||||
spanName = addPrefixToSpanName(tw.reqMethodInSpanName, r.Method, routePattern)
|
||||
span.SetName(spanName)
|
||||
}
|
||||
|
||||
// set status code attribute
|
||||
span.SetAttributes(semconv.HTTPStatusCodeKey.Int(rrw.status))
|
||||
|
||||
// set span status
|
||||
spanStatus, spanMessage := semconv.SpanStatusFromHTTPStatusCode(rrw.status)
|
||||
span.SetStatus(spanStatus, spanMessage)
|
||||
}
|
||||
|
||||
func addPrefixToSpanName(shouldAdd bool, prefix, spanName string) string {
|
||||
// in chi v5.0.8, the root route will be returned has an empty string
|
||||
// (see github.com/go-chi/chi/v5@v5.0.8/context.go:126)
|
||||
if spanName == "" {
|
||||
spanName = "/"
|
||||
}
|
||||
|
||||
if shouldAdd && len(spanName) > 0 {
|
||||
spanName = prefix + " " + spanName
|
||||
}
|
||||
return spanName
|
||||
}
|
||||
Reference in New Issue
Block a user