LogDog: Add collector service implementation.

server/internal/logdog/config/config_test.go

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package config
+
+import (
+        "testing"
+        "time"
+
+        "github.com/golang/protobuf/proto"
+        "github.com/luci/luci-go/common/clock"
+        "github.com/luci/luci-go/common/clock/testclock"
+        "github.com/luci/luci-go/common/config"
+        "github.com/luci/luci-go/common/config/impl/memory"
+        "github.com/luci/luci-go/common/proto/logdog/svcconfig"
+        "golang.org/x/net/context"
+
+        . "github.com/luci/luci-go/common/testing/assertions"
+        . "github.com/smartystreets/goconvey/convey"
+)
+
+func TestConfig(t *testing.T) {
+        t.Parallel()
+
+        Convey(`Using in-memory configuration manager options`, t, func() {
+                c := context.Background()
+                c, tc := testclock.UseTime(c, testclock.TestTimeLocal)
+
+                // In-memory configuration service.
+                cfg := &svcconfig.Config{
+                        Transport: &svcconfig.Transport{
+                                Type: &svcconfig.Transport_Pubsub{
+                                        Pubsub: &svcconfig.Transport_PubSub{
+                                                Project:      "foo",
+                                                Topic:        "bar",
+                                                Subscription: "baz",
+                                        },
+                                },
+                        },
+                }
+                cset := memory.ConfigSet{
+                        "test-configuration.cfg": proto.MarshalTextString(cfg),
+                }
+                o := Options{
+                        Config: memory.New(map[string]memory.ConfigSet{
+                                "svcconfig/logdog/test": cset,
+                        }),
+                        ConfigSet:  "svcconfig/logdog/test",
+                        ConfigPath: "test-configuration.cfg",
+                }
+
+                Convey(`Will fail to create a Manager if the configuration does not exist.`, func() {
+                        o.ConfigPath = "nonexistent.cfg"
+
+                        _, err := NewManager(c, o)
+                        So(err, ShouldEqual, config.ErrNoConfig)
+                })
+
+                Convey(`Will fail to create a Manager if the configuration is an invalid protobuf.`, func() {
+                        cset[o.ConfigPath] = "not a valid text protobuf"
+
+                        _, err := NewManager(c, o)
+                        So(err, ShouldNotBeNil)
+                })
+
+                Convey(`Can create a Manager.`, func() {
+                        m, err := NewManager(c, o)
+                        So(err, ShouldBeNil)
+                        So(m.Config(), ShouldResembleV, cfg)
+                })
+
+                Convey(`With a kill function installed`, func() {
+                        killedC := make(chan bool, 1)
+                        o.KillCheckInterval = time.Second
+                        o.KillFunc = func() {
+                                killedC <- true
+                        }
+
+                        c, cancelFunc := context.WithCancel(c)
+                        defer cancelFunc()
+
+                        timeAdvanceC := make(chan time.Duration)
+                        tc.SetTimerCallback(func(time.Duration, clock.Timer) {
+                                tc.Add(<-timeAdvanceC)
+                        })
+
+                        m, err := NewManager(c, o)
+                        So(err, ShouldBeNil)
+
+                        Convey(`When the configuration changes`, func() {
+                                cfg.Transport.GetPubsub().Project = "qux"
+                                cset[o.ConfigPath] = proto.MarshalTextString(cfg)
+
+                                Convey(`Will execute the kill function if the configuration changes.`, func() {
+                                        timeAdvanceC <- time.Second
+                                        So(<-killedC, ShouldBeTrue)
+                                        time.Sleep(10)
+                                })
+                        })
+
+                        Convey(`Will do nothing if the configuration doesn't change.`, func() {
+                                // Advancing time twice ensures that the poll loop has processed at
+                                // least one non-changing reload.
+                                timeAdvanceC <- time.Second
+                                timeAdvanceC <- time.Second
+
+                                So(m.Config(), ShouldResembleV, cfg)
+                        })
+                })
+        })
+}