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206aa3c203
* update vendor directory, add go.opencensus.io * update imports * oops * s/opentracing/opencensus/ & remove prometheus / zipkin stuff & remove old stats * the dep train rides again * fix gin build * deps from last guy * start in on the agent metrics * she builds * remove tags for now, cardinality error is fussing. subscribe instead of register * update to patched version of opencensus to proceed for now TODO switch to a release * meh fix imports * println debug the bad boys * lace it with the tags * update deps again * fix all inconsistent cardinality errors * add our own logger * fix init * fix oom measure * remove bugged removal code * fix s3 measures * fix prom handler nil
110 lines
3.0 KiB
Go
110 lines
3.0 KiB
Go
package zipkin_test
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import (
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"log"
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"net/http"
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"net/http/httptest"
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"os"
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"time"
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"github.com/gorilla/mux"
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zipkin "github.com/openzipkin/zipkin-go"
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zipkinhttp "github.com/openzipkin/zipkin-go/middleware/http"
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logreporter "github.com/openzipkin/zipkin-go/reporter/log"
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)
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func Example() {
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// set up a span reporter
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reporter := logreporter.NewReporter(log.New(os.Stderr, "", log.LstdFlags))
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defer reporter.Close()
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// create our local service endpoint
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endpoint, err := zipkin.NewEndpoint("myService", "localhost:0")
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if err != nil {
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log.Fatalf("unable to create local endpoint: %+v\n", err)
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}
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// initialize our tracer
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tracer, err := zipkin.NewTracer(reporter, zipkin.WithLocalEndpoint(endpoint))
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if err != nil {
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log.Fatalf("unable to create tracer: %+v\n", err)
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}
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// create global zipkin http server middleware
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serverMiddleware := zipkinhttp.NewServerMiddleware(
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tracer, zipkinhttp.TagResponseSize(true),
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)
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// create global zipkin traced http client
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client, err := zipkinhttp.NewClient(tracer, zipkinhttp.ClientTrace(true))
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if err != nil {
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log.Fatalf("unable to create client: %+v\n", err)
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}
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// initialize router
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router := mux.NewRouter()
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// start web service with zipkin http server middleware
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ts := httptest.NewServer(serverMiddleware(router))
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defer ts.Close()
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// set-up handlers
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router.Methods("GET").Path("/some_function").HandlerFunc(someFunc(client, ts.URL))
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router.Methods("POST").Path("/other_function").HandlerFunc(otherFunc(client))
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// initiate a call to some_func
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req, err := http.NewRequest("GET", ts.URL+"/some_function", nil)
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if err != nil {
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log.Fatalf("unable to create http request: %+v\n", err)
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}
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res, err := client.DoWithAppSpan(req, "some_function")
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if err != nil {
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log.Fatalf("unable to do http request: %+v\n", err)
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}
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res.Body.Close()
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// Output:
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}
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func someFunc(client *zipkinhttp.Client, url string) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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log.Printf("some_function called with method: %s\n", r.Method)
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// retrieve span from context (created by server middleware)
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span := zipkin.SpanFromContext(r.Context())
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span.Tag("custom_key", "some value")
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// doing some expensive calculations....
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time.Sleep(25 * time.Millisecond)
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span.Annotate(time.Now(), "expensive_calc_done")
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newRequest, err := http.NewRequest("POST", url+"/other_function", nil)
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if err != nil {
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log.Printf("unable to create client: %+v\n", err)
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http.Error(w, err.Error(), 500)
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return
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}
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ctx := zipkin.NewContext(newRequest.Context(), span)
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newRequest = newRequest.WithContext(ctx)
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res, err := client.DoWithAppSpan(newRequest, "other_function")
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if err != nil {
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log.Printf("call to other_function returned error: %+v\n", err)
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http.Error(w, err.Error(), 500)
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return
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}
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res.Body.Close()
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}
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}
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func otherFunc(client *zipkinhttp.Client) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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log.Printf("other_function called with method: %s\n", r.Method)
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time.Sleep(50 * time.Millisecond)
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}
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}
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