Golang FakeFileSystem.ReadFile方法代碼示例

		err  error
	)

	BeforeEach(func() {
		fs = fakesys.NewFakeFileSystem()
		path = "/agent_state.json"
		s, err = platform.NewBootstrapState(fs, path)
		Expect(err).NotTo(HaveOccurred())
	})

	Describe("SaveState", func() {
		It("saves the state file with the appropriate properties", func() {
			s.Linux = platform.LinuxState{HostsConfigured: true}
			s.SaveState()

			contents, readerr := fs.ReadFile(path)

			Expect(readerr).ToNot(HaveOccurred())
			Expect(string(contents)).To(Equal(`{"Linux":{"hosts_configured":true}}`))
		})

		It("saves the state file with the properties passed in", func() {
			s.Linux = platform.LinuxState{HostsConfigured: true}
			s.SaveState()

			contents, readerr := fs.ReadFile(path)

			Expect(readerr).ToNot(HaveOccurred())
			Expect(string(contents)).To(Equal(`{"Linux":{"hosts_configured":true}}`))
		})

func init() {
	Describe("settingsService", func() {
		var (
			fs                         *fakesys.FakeFileSystem
			fakeDefaultNetworkResolver *fakenet.FakeDefaultNetworkResolver
			fakeSettingsSource         *fakes.FakeSettingsSource
		)

		BeforeEach(func() {
			fs = fakesys.NewFakeFileSystem()
			fakeDefaultNetworkResolver = &fakenet.FakeDefaultNetworkResolver{}
			fakeSettingsSource = &fakes.FakeSettingsSource{}
		})

		buildService := func() (Service, *fakesys.FakeFileSystem) {
			logger := boshlog.NewLogger(boshlog.LevelNone)
			service := NewService(fs, "/setting/path.json", fakeSettingsSource, fakeDefaultNetworkResolver, logger)
			return service, fs
		}

		Describe("LoadSettings", func() {
			var (
				fetchedSettings Settings
				fetcherFuncErr  error
				service         Service
			)

			BeforeEach(func() {
				fetchedSettings = Settings{}
				fetcherFuncErr = nil
			})

			JustBeforeEach(func() {
				fakeSettingsSource.SettingsValue = fetchedSettings
				fakeSettingsSource.SettingsErr = fetcherFuncErr
				service, fs = buildService()
			})

			Context("when settings fetcher succeeds fetching settings", func() {
				BeforeEach(func() {
					fetchedSettings = Settings{AgentID: "some-new-agent-id"}
				})

				Context("when settings contain at most one dynamic network", func() {
					BeforeEach(func() {
						fetchedSettings.Networks = Networks{
							"fake-net-1": Network{Type: NetworkTypeDynamic},
						}
					})

					It("updates the service with settings from the fetcher", func() {
						err := service.LoadSettings()
						Expect(err).NotTo(HaveOccurred())
						Expect(service.GetSettings().AgentID).To(Equal("some-new-agent-id"))
					})

					It("persists settings to the settings file", func() {
						err := service.LoadSettings()
						Expect(err).NotTo(HaveOccurred())

						json, err := json.Marshal(fetchedSettings)
						Expect(err).NotTo(HaveOccurred())

						fileContent, err := fs.ReadFile("/setting/path.json")
						Expect(err).NotTo(HaveOccurred())
						Expect(fileContent).To(Equal(json))
					})

					It("returns any error from writing to the setting file", func() {
						fs.WriteFileError = errors.New("fs-write-file-error")

						err := service.LoadSettings()
						Expect(err).To(HaveOccurred())
						Expect(err.Error()).To(ContainSubstring("fs-write-file-error"))
					})
				})
			})

			Context("when settings fetcher fails fetching settings", func() {
				BeforeEach(func() {
					fetcherFuncErr = errors.New("fake-fetch-error")
				})

				Context("when a settings file exists", func() {
					Context("when settings contain at most one dynamic network", func() {
						BeforeEach(func() {
							fs.WriteFile("/setting/path.json", []byte(`{
								"agent_id":"some-agent-id",
								"networks": {"fake-net-1": {"type": "dynamic"}}
							}`))

							fakeDefaultNetworkResolver.GetDefaultNetworkNetwork = Network{
								IP:      "fake-resolved-ip",
								Netmask: "fake-resolved-netmask",
								Gateway: "fake-resolved-gateway",
							}
						})

						It("returns settings from the settings file with resolved network", func() {
							err := service.LoadSettings()
//.........這裏部分代碼省略.........

						Records: [][2]string{
							{"fake-ip0", "fake-name0"},
							{"fake-ip1", "fake-name1"},
						},
					}))
				})

				Context("local DNS state operations", func() {
					Context("when loading succeeds", func() {
						Context("when saving succeeds", func() {
							It("saves the new local DNS state", func() {
								response, err := action.Run("fake-blobstore-id", "fake-fingerprint", 3)
								Expect(err).ToNot(HaveOccurred())
								Expect(response).To(Equal("synced"))

								contents, err := fakeFileSystem.ReadFile(stateFilePath)
								Expect(err).ToNot(HaveOccurred())
								localDNSState := state.LocalDNSState{}
								err = json.Unmarshal(contents, &localDNSState)
								Expect(err).ToNot(HaveOccurred())
								Expect(localDNSState).To(Equal(state.LocalDNSState{Version: 3}))
							})
						})

						Context("when loading fails", func() {
							BeforeEach(func() {
								fakeFileSystem.RegisterReadFileError(stateFilePath, errors.New("fake-read-error"))
							})

							It("returns an error", func() {
								_, err := action.Run("fake-blobstore-id", "fake-fingerprint", 3)

//.........這裏部分代碼省略.........

			Context("when no DNS servers are configured", func() {
				BeforeEach(func() {
					dhcpNetwork.DNS = []string{}
					networks = boshsettings.Networks{
						"first":  dhcpNetwork,
						"second": staticNetwork,
					}
				})

				Context("when could not read link /etc/resolv.conf", func() {
					It("fails reporting error", func() {
						fs.ReadLinkError = errors.New("fake-read-link-error")

						err := netManager.SetupNetworking(networks, nil)
						Expect(err).To(HaveOccurred())
						Expect(err.Error()).To(ContainSubstring("Reading /etc/resolv.conf symlink"))
					})
				})

				Context("when /etc/resolv.conf is no symlink", func() {
					BeforeEach(func() {
						err := fs.Symlink("/etc/resolv.conf", "/etc/resolv.conf")
						Expect(err).ToNot(HaveOccurred())

						err = fs.WriteFileString("/etc/resolv.conf", "fake-content")
						Expect(err).ToNot(HaveOccurred())
					})

					It("copies /etc/resolv.conf to .../resolv.conf.d/base", func() {
						err := netManager.SetupNetworking(networks, nil)
						Expect(err).ToNot(HaveOccurred())

						contents, err := fs.ReadFile("/etc/resolvconf/resolv.conf.d/base")
						Expect(err).ToNot(HaveOccurred())
						Expect(string(contents)).To(Equal("fake-content"))
					})

					Context("when copying fails", func() {
						It("fails reporting the error", func() {
							fs.CopyFileError = errors.New("fake-copy-error")

							err := netManager.SetupNetworking(networks, nil)
							Expect(err).To(HaveOccurred())
							Expect(err.Error()).To(ContainSubstring("Copying /etc/resolv.conf for backwards compat"))
						})
					})
				})
			})

			It("forces /etc/resolv.conf to be a symlink", func() {
				err := netManager.SetupNetworking(networks, nil)
				Expect(err).ToNot(HaveOccurred())
				Expect(fs.ReadLink("/etc/resolv.conf")).To(Equal("/run/resolvconf/resolv.conf"))
			})

			Context("when symlink command fails", func() {
				BeforeEach(func() {
					fs.SymlinkError = errors.New("fake-symlink-error")
				})

				It("fails reporting error", func() {
					err := netManager.SetupNetworking(networks, nil)
					Expect(err).To(HaveOccurred())
					Expect(err.Error()).To(ContainSubstring("Setting up /etc/resolv.conf symlink"))
				})

func describeDummyPlatform() {
	var (
		platform           Platform
		collector          boshstats.Collector
		fs                 *fakesys.FakeFileSystem
		cmdRunner          boshsys.CmdRunner
		dirProvider        boshdirs.Provider
		devicePathResolver boshdpresolv.DevicePathResolver
		logger             boshlog.Logger
	)

	BeforeEach(func() {
		collector = &fakestats.FakeCollector{}
		fs = fakesys.NewFakeFileSystem()
		cmdRunner = fakesys.NewFakeCmdRunner()
		dirProvider = boshdirs.NewProvider("/fake-dir")
		devicePathResolver = fakedpresolv.NewFakeDevicePathResolver()
		logger = boshlog.NewLogger(boshlog.LevelNone)
	})

	JustBeforeEach(func() {
		platform = NewDummyPlatform(
			collector,
			fs,
			cmdRunner,
			dirProvider,
			devicePathResolver,
			logger,
		)
	})

	Describe("GetDefaultNetwork", func() {
		It("returns the contents of dummy-defaults-network-settings.json since that's what the dummy cpi writes", func() {
			settingsFilePath := "/fake-dir/bosh/dummy-default-network-settings.json"
			fs.WriteFileString(settingsFilePath, `{"IP": "1.2.3.4"}`)

			network, err := platform.GetDefaultNetwork()
			Expect(err).NotTo(HaveOccurred())

			Expect(network.IP).To(Equal("1.2.3.4"))
		})
	})

	Describe("GetCertManager", func() {
		It("returns a dummy cert manager", func() {
			certManager := platform.GetCertManager()

			Expect(certManager.UpdateCertificates("")).Should(BeNil())
		})
	})

	Describe("MountPersistentDisk", func() {
		var diskSettings boshsettings.DiskSettings
		var mountsPath, managedSettingsPath, formattedDisksPath string

		BeforeEach(func() {
			diskSettings = boshsettings.DiskSettings{ID: "somediskid"}
			mountsPath = filepath.Join(dirProvider.BoshDir(), "mounts.json")
			managedSettingsPath = filepath.Join(dirProvider.BoshDir(), "managed_disk_settings.json")
			formattedDisksPath = filepath.Join(dirProvider.BoshDir(), "formatted_disks.json")
		})

		It("Mounts a persistent disk", func() {
			mountsContent, _ := fs.ReadFileString(mountsPath)
			Expect(mountsContent).To(Equal(""))

			err := platform.MountPersistentDisk(diskSettings, "/dev/potato")
			Expect(err).NotTo(HaveOccurred())

			mountsContent, _ = fs.ReadFileString(mountsPath)
			Expect(mountsContent).To(Equal(`[{"MountDir":"/dev/potato","DiskCid":"somediskid"}]`))
		})

		It("Updates the managed disk settings", func() {
			lastMountedCid, _ := fs.ReadFileString(managedSettingsPath)
			Expect(lastMountedCid).To(Equal(""))

			err := platform.MountPersistentDisk(diskSettings, "/dev/potato")
			Expect(err).NotTo(HaveOccurred())

			lastMountedCid, _ = fs.ReadFileString(managedSettingsPath)
			Expect(lastMountedCid).To(Equal("somediskid"))
		})

		It("Updates the formatted disks", func() {
			formattedDisks, _ := fs.ReadFileString(formattedDisksPath)
			Expect(formattedDisks).To(Equal(""))

			err := platform.MountPersistentDisk(diskSettings, "/dev/potato")
			Expect(err).NotTo(HaveOccurred())

			formattedDisks, _ = fs.ReadFileString(formattedDisksPath)
			Expect(formattedDisks).To(Equal(`[{"DiskCid":"somediskid"}]`))
		})

		Context("Device has already been mounted as expected", func() {
			BeforeEach(func() {
				fs.WriteFileString(managedSettingsPath, "somediskid")
				fs.WriteFileString(mountsPath, `[{"MountDir":"/dev/potato","DiskCid":"somediskid"}]`)
			})
//.........這裏部分代碼省略.........

func init() {
	Describe("concreteManagerProvider", func() {
		Describe("NewManager", func() {
			It("returns manager with tasks.json as its tasks path", func() {
				logger := boshlog.NewLogger(boshlog.LevelNone)
				fs := fakesys.NewFakeFileSystem()

				taskInfo := boshtask.Info{
					TaskID:  "fake-task-id",
					Method:  "fake-method",
					Payload: []byte("fake-payload"),
				}

				manager := boshtask.NewManagerProvider().NewManager(logger, fs, "/dir/path")
				err := manager.AddInfo(taskInfo)
				Expect(err).ToNot(HaveOccurred())

				// Check expected file location with another manager
				otherManager := boshtask.NewManager(logger, fs, "/dir/path/tasks.json")

				taskInfos, err := otherManager.GetInfos()
				Expect(err).ToNot(HaveOccurred())
				Expect(taskInfos).To(Equal([]boshtask.Info{taskInfo}))
			})
		})
	})

	Describe("concreteManager", func() {
		var (
			logger  boshlog.Logger
			fs      *fakesys.FakeFileSystem
			manager boshtask.Manager
		)

		BeforeEach(func() {
			logger = boshlog.NewLogger(boshlog.LevelNone)
			fs = fakesys.NewFakeFileSystem()
			manager = boshtask.NewManager(logger, fs, "/dir/path")
		})

		Describe("GetInfos", func() {
			It("can load multiple tasks", func() {
				err := manager.AddInfo(boshtask.Info{
					TaskID:  "fake-task-id-1",
					Method:  "fake-method-1",
					Payload: []byte("fake-payload-1"),
				})
				Expect(err).ToNot(HaveOccurred())

				err = manager.AddInfo(boshtask.Info{
					TaskID:  "fake-task-id-2",
					Method:  "fake-method-2",
					Payload: []byte("fake-payload-2"),
				})
				Expect(err).ToNot(HaveOccurred())

				// Make sure we are not getting cached copy of taskInfos
				reloadedManager := boshtask.NewManager(logger, fs, "/dir/path")

				taskInfos, err := reloadedManager.GetInfos()
				Expect(err).ToNot(HaveOccurred())
				Expect(taskInfos).To(ConsistOf([]boshtask.Info{
					boshtask.Info{
						TaskID:  "fake-task-id-1",
						Method:  "fake-method-1",
						Payload: []byte("fake-payload-1"),
					},
					boshtask.Info{
						TaskID:  "fake-task-id-2",
						Method:  "fake-method-2",
						Payload: []byte("fake-payload-2"),
					},
				}))
			})

			It("succeeds when there is no tasks (file is not present)", func() {
				taskInfos, err := manager.GetInfos()
				Expect(err).ToNot(HaveOccurred())
				Expect(len(taskInfos)).To(Equal(0))
			})

			It("returns an error when failing to load tasks from the file that exists", func() {
				err := manager.AddInfo(boshtask.Info{
					TaskID:  "fake-task-id-2",
					Method:  "fake-method-2",
					Payload: []byte("fake-payload-2"),
				})
				Expect(err).ToNot(HaveOccurred())

				fs.ReadFileError = errors.New("fake-read-error")

				_, err = manager.GetInfos()
				Expect(err).To(HaveOccurred())
				Expect(err.Error()).To(ContainSubstring("fake-read-error"))
			})
		})

		Describe("AddInfo", func() {
			It("can add multiple tasks", func() {
				err := manager.AddInfo(boshtask.Info{
//.........這裏部分代碼省略.........