mirror of
https://github.com/fnproject/fn.git
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9eaf824398
* add jaeger support, link hot container & req span * adds jaeger support now with FN_JAEGER_URL, there's a simple tutorial in the operating/metrics.md file now and it's pretty easy to get up and running. * links a hot request span to a hot container span. when we change this to sample at a lower ratio we'll need to finagle the hot container span to always sample or something, otherwise we'll hide that info. at least, since we're sampling at 100% for now if this is flipped on, can see freeze/unfreeze etc. if they hit. this is useful for debugging. note that zipkin's exporter does not follow the link at all, hence jaeger... and they're backed by the Cloud Empire now (CNCF) so we'll probably use it anyway. * vendor: add thrift for jaeger
88 lines
1.8 KiB
Go
88 lines
1.8 KiB
Go
// Copyright 2013 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package singleflight
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import (
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"errors"
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"fmt"
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"sync"
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"sync/atomic"
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"testing"
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"time"
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)
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func TestDo(t *testing.T) {
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var g Group
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v, err, _ := g.Do("key", func() (interface{}, error) {
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return "bar", nil
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})
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if got, want := fmt.Sprintf("%v (%T)", v, v), "bar (string)"; got != want {
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t.Errorf("Do = %v; want %v", got, want)
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}
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if err != nil {
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t.Errorf("Do error = %v", err)
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}
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}
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func TestDoErr(t *testing.T) {
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var g Group
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someErr := errors.New("Some error")
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v, err, _ := g.Do("key", func() (interface{}, error) {
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return nil, someErr
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})
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if err != someErr {
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t.Errorf("Do error = %v; want someErr %v", err, someErr)
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}
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if v != nil {
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t.Errorf("unexpected non-nil value %#v", v)
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}
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}
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func TestDoDupSuppress(t *testing.T) {
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var g Group
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var wg1, wg2 sync.WaitGroup
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c := make(chan string, 1)
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var calls int32
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fn := func() (interface{}, error) {
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if atomic.AddInt32(&calls, 1) == 1 {
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// First invocation.
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wg1.Done()
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}
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v := <-c
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c <- v // pump; make available for any future calls
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time.Sleep(10 * time.Millisecond) // let more goroutines enter Do
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return v, nil
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}
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const n = 10
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wg1.Add(1)
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for i := 0; i < n; i++ {
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wg1.Add(1)
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wg2.Add(1)
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go func() {
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defer wg2.Done()
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wg1.Done()
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v, err, _ := g.Do("key", fn)
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if err != nil {
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t.Errorf("Do error: %v", err)
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return
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}
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if s, _ := v.(string); s != "bar" {
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t.Errorf("Do = %T %v; want %q", v, v, "bar")
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}
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}()
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}
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wg1.Wait()
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// At least one goroutine is in fn now and all of them have at
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// least reached the line before the Do.
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c <- "bar"
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wg2.Wait()
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if got := atomic.LoadInt32(&calls); got <= 0 || got >= n {
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t.Errorf("number of calls = %d; want over 0 and less than %d", got, n)
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}
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}
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