func start(flagSet *flag.FlagSet, path string, controller confab.Controller, agentClient *confab.AgentClient) {
timeout := confab.NewTimeout(time.After(time.Duration(controller.Config.Confab.TimeoutInSeconds) * time.Second))
_, err := os.Stat(controller.Config.Path.ConsulConfigDir)
if err != nil {
printUsageAndExit(fmt.Sprintf("\"consul_config_dir\" %q could not be found",
controller.Config.Path.ConsulConfigDir), flagSet)
}
if len(agentClient.ExpectedMembers) == 0 {
printUsageAndExit("at least one \"expected-member\" must be provided", flagSet)
}
err = controller.WriteServiceDefinitions()
if err != nil {
stderr.Printf("error writing service definitions: %s", err)
os.Exit(1)
}
err = controller.BootAgent(timeout)
if err != nil {
stderr.Printf("error booting consul agent: %s", err)
// DO NOT call StopAgent:
// - the agent may aleady be running
// - the pidfile may contain the PID of another running process
os.Exit(1)
}
if controller.Config.Consul.Agent.Server {
configureServer(controller, agentClient, timeout)
} else {
configureClient(controller)
}
}
func start(flagSet *flag.FlagSet, path string, controller confab.Controller, agentClient *agent.Client) {
timeout := confab.NewTimeout(time.After(time.Duration(controller.Config.Confab.TimeoutInSeconds) * time.Second))
_, err := os.Stat(controller.Config.Path.ConsulConfigDir)
if err != nil {
printUsageAndExit(fmt.Sprintf("\"consul_config_dir\" %q could not be found",
controller.Config.Path.ConsulConfigDir), flagSet)
}
if len(agentClient.ExpectedMembers) == 0 {
printUsageAndExit("at least one \"expected-member\" must be provided", flagSet)
}
err = controller.WriteConsulConfig()
if err != nil {
stderr.Printf("error writing consul config file: %s", err)
os.Exit(1)
}
err = controller.WriteServiceDefinitions()
if err != nil {
stderr.Printf("error writing service definitions: %s", err)
os.Exit(1)
}
err = controller.BootAgent(timeout)
if err != nil {
stderr.Printf("error booting consul agent: %s", err)
exit(controller, 1)
}
if controller.Config.Consul.Agent.Mode == "server" {
configureServer(controller, agentClient, timeout)
} else {
configureClient(controller)
}
}
func main() {
flagSet := flag.NewFlagSet("flags", flag.ContinueOnError)
flagSet.BoolVar(&isServer, "server", false, "whether to start the agent in server mode")
flagSet.StringVar(&agentPath, "agent-path", "", "path to the on-filesystem consul `executable`")
flagSet.StringVar(&consulConfigDir, "consul-config-dir", "", "path to consul configuration `directory`")
flagSet.StringVar(&pidFile, "pid-file", "", "path to consul PID `file`")
flagSet.Var(&expectedMembers, "expected-member", "address `list` of the expected members")
flagSet.Var(&encryptionKeys, "encryption-key", "`key` used to encrypt consul traffic")
if len(os.Args) < 2 {
printUsageAndExit("invalid number of arguments", flagSet)
}
command := os.Args[1]
if !validCommand(command) {
printUsageAndExit(fmt.Sprintf("invalid COMMAND %q", command), flagSet)
}
flagSet.Parse(os.Args[2:])
path, err := exec.LookPath(agentPath)
if err != nil {
printUsageAndExit(fmt.Sprintf("\"agent-path\" %q cannot be found", agentPath), flagSet)
}
if len(pidFile) == 0 {
printUsageAndExit("\"pid-file\" cannot be empty", flagSet)
}
if command == "start" {
_, err = os.Stat(consulConfigDir)
if err != nil {
printUsageAndExit(fmt.Sprintf("\"consul-config-dir\" %q could not be found", consulConfigDir), flagSet)
}
if len(expectedMembers) == 0 {
printUsageAndExit("at least one \"expected-member\" must be provided", flagSet)
}
agentRunner := confab.AgentRunner{
Path: path,
PIDFile: pidFile,
ConfigDir: consulConfigDir,
Stdout: os.Stdout,
Stderr: os.Stderr,
}
consulAPIClient, err := api.NewClient(api.DefaultConfig())
if err != nil {
panic(err) // not tested, NewClient never errors
}
agentClient := confab.AgentClient{
ExpectedMembers: expectedMembers,
ConsulAPIAgent: consulAPIClient.Agent(),
ConsulRPCClient: nil,
}
controller := confab.Controller{
AgentRunner: &agentRunner,
AgentClient: &agentClient,
MaxRetries: 10,
SyncRetryDelay: 1 * time.Second,
SyncRetryClock: clock.NewClock(),
EncryptKeys: encryptionKeys,
SSLDisabled: false,
Logger: stdout,
}
err = controller.BootAgent()
if err != nil {
stderr.Printf("error booting consul agent: %s", err)
os.Exit(1)
}
if !isServer {
return
}
rpcClient, err := agent.NewRPCClient("localhost:8400")
if err != nil {
stderr.Printf("error connecting to RPC server: %s", err)
os.Exit(1)
}
agentClient.ConsulRPCClient = &confab.RPCClient{
*rpcClient,
}
err = controller.ConfigureServer()
if err != nil {
stderr.Printf("error connecting to RPC server: %s", err)
os.Exit(1) // not tested; it is challenging with the current fake agent.
}
}
if command == "stop" {
agentRunner := confab.AgentRunner{
Path: path,
PIDFile: pidFile,
ConfigDir: "",
Stdout: os.Stdout,
Stderr: os.Stderr,
}
consulAPIClient, err := api.NewClient(api.DefaultConfig())
if err != nil {
panic(err) // not tested, NewClient never errors
}
agentClient := confab.AgentClient{
ExpectedMembers: nil,
ConsulAPIAgent: consulAPIClient.Agent(),
ConsulRPCClient: nil,
}
controller := confab.Controller{
AgentRunner: &agentRunner,
AgentClient: &agentClient,
MaxRetries: 10,
SyncRetryDelay: 1 * time.Second,
SyncRetryClock: clock.NewClock(),
EncryptKeys: nil,
SSLDisabled: false,
Logger: stdout,
}
rpcClient, err := agent.NewRPCClient("localhost:8400")
if err != nil {
stderr.Printf("error connecting to RPC server: %s", err)
os.Exit(1)
}
agentClient.ConsulRPCClient = &confab.RPCClient{
*rpcClient,
}
stdout.Printf("MAIN: stopping agent")
err = controller.StopAgent()
if err != nil {
stderr.Printf("error stopping agent: %s", err)
os.Exit(1)
}
stdout.Printf("MAIN: stopped agent")
}
}
logBuffer = &bytes.Buffer{}
controller = confab.Controller{
AgentClient: agentClient,
AgentRunner: agentRunner,
MaxRetries: 10,
SyncRetryDelay: 10 * time.Millisecond,
SyncRetryClock: clock,
EncryptKeys: []string{"key 1", "key 2", "key 3"},
Logger: log.New(logBuffer, "[Test]", 0),
}
})
Describe("BootAgent", func() {
It("launches the consul agent", func() {
Expect(controller.BootAgent()).To(Succeed())
Expect(agentRunner.RunCalls.CallCount).To(Equal(1))
})
It("checks that the agent has joined a cluster", func() {
Expect(controller.BootAgent()).To(Succeed())
Expect(agentClient.VerifyJoinedCalls.CallCount).To(Equal(1))
})
Context("when starting the agent fails", func() {
It("immediately returns an error", func() {
agentRunner.RunCalls.Returns.Errors = []error{errors.New("some error")}
Expect(controller.BootAgent()).To(MatchError("some error"))
Expect(agentRunner.RunCalls.CallCount).To(Equal(1))
Expect(agentClient.VerifyJoinedCalls.CallCount).To(Equal(0))
},
{
Action: "controller.write-service-definitions.write",
},
{
Action: "controller.write-service-definitions.write.failed",
Error: errors.New("write definitions error"),
},
}))
})
})
})
Describe("BootAgent", func() {
It("launches the consul agent and confirms that it joined the cluster", func() {
Expect(controller.BootAgent(confab.NewTimeout(make(chan time.Time)))).To(Succeed())
Expect(agentRunner.RunCalls.CallCount).To(Equal(1))
Expect(agentClient.VerifyJoinedCalls.CallCount).To(Equal(1))
Expect(logger.Messages).To(ContainSequence([]fakes.LoggerMessage{
{
Action: "controller.boot-agent.run",
},
{
Action: "controller.boot-agent.verify-joined",
},
{
Action: "controller.boot-agent.success",
},
}))
})