Golang state.Open函數代碼示例

// newState returns a new State that uses the given environment.
// The environment must have already been bootstrapped.
func newState(environ environs.Environ, mongoInfo *mongo.MongoInfo) (*state.State, error) {
	config := environ.Config()
	password := config.AdminSecret()
	if password == "" {
		return nil, fmt.Errorf("cannot connect without admin-secret")
	}
	modelTag := names.NewModelTag(config.UUID())

	mongoInfo.Password = password
	opts := mongo.DefaultDialOpts()
	st, err := state.Open(modelTag, mongoInfo, opts, environs.NewStatePolicy())
	if errors.IsUnauthorized(errors.Cause(err)) {
		// We try for a while because we might succeed in
		// connecting to mongo before the state has been
		// initialized and the initial password set.
		for a := redialStrategy.Start(); a.Next(); {
			st, err = state.Open(modelTag, mongoInfo, opts, environs.NewStatePolicy())
			if !errors.IsUnauthorized(errors.Cause(err)) {
				break
			}
		}
		if err != nil {
			return nil, err
		}
	} else if err != nil {
		return nil, err
	}
	if err := updateSecrets(environ, st); err != nil {
		st.Close()
		return nil, fmt.Errorf("unable to push secrets: %v", err)
	}
	return st, nil
}

// NewConn returns a new Conn that uses the
// given environment. The environment must have already
// been bootstrapped.
func NewConn(environ environs.Environ) (*Conn, error) {
	info, _, err := environ.StateInfo()
	if err != nil {
		return nil, err
	}
	password := environ.Config().AdminSecret()
	if password == "" {
		return nil, fmt.Errorf("cannot connect without admin-secret")
	}
	err = environs.CheckEnvironment(environ)
	if err != nil {
		return nil, err
	}

	info.Password = password
	opts := mongo.DefaultDialOpts()
	st, err := state.Open(info, opts, environs.NewStatePolicy())
	if errors.IsUnauthorized(err) {
		logger.Infof("authorization error while connecting to state server; retrying")
		// We can't connect with the administrator password,;
		// perhaps this was the first connection and the
		// password has not been changed yet.
		info.Password = utils.UserPasswordHash(password, utils.CompatSalt)

		// We try for a while because we might succeed in
		// connecting to mongo before the state has been
		// initialized and the initial password set.
		for a := redialStrategy.Start(); a.Next(); {
			st, err = state.Open(info, opts, environs.NewStatePolicy())
			if !errors.IsUnauthorized(err) {
				break
			}
		}
		if err != nil {
			return nil, err
		}
		if err := st.SetAdminMongoPassword(password); err != nil {
			return nil, err
		}
	} else if err != nil {
		return nil, err
	}
	conn := &Conn{
		Environ: environ,
		State:   st,
	}
	if err := conn.updateSecrets(); err != nil {
		conn.Close()
		return nil, fmt.Errorf("unable to push secrets: %v", err)
	}
	return conn, nil
}

func (s *BootstrapSuite) TestInitialPassword(c *gc.C) {
	machineConf, cmd, err := s.initBootstrapCommand(c, nil, "--env-config", s.envcfg, "--instance-id", string(s.instanceId))
	c.Assert(err, gc.IsNil)

	err = cmd.Run(nil)
	c.Assert(err, gc.IsNil)

	// Check that we cannot now connect to the state without a
	// password.
	info := &authentication.MongoInfo{
		Info: mongo.Info{
			Addrs:  []string{gitjujutesting.MgoServer.Addr()},
			CACert: testing.CACert,
		},
	}
	testOpenState(c, info, errors.Unauthorizedf(""))

	// Check we can log in to mongo as admin.
	// TODO(dfc) does passing nil for the admin user name make your skin crawl ? mine too.
	info.Tag, info.Password = nil, testPasswordHash()
	st, err := state.Open(info, mongo.DefaultDialOpts(), environs.NewStatePolicy())
	c.Assert(err, gc.IsNil)
	// Reset password so the tests can continue to use the same server.
	defer st.Close()
	defer st.SetAdminMongoPassword("")

	// Check that the admin user has been given an appropriate
	// password
	u, err := st.User("admin")
	c.Assert(err, gc.IsNil)
	c.Assert(u.PasswordValid(testPassword), gc.Equals, true)

	// Check that the machine configuration has been given a new
	// password and that we can connect to mongo as that machine
	// and that the in-mongo password also verifies correctly.
	machineConf1, err := agent.ReadConfig(agent.ConfigPath(machineConf.DataDir(), names.NewMachineTag("0")))
	c.Assert(err, gc.IsNil)

	stateinfo, ok := machineConf1.MongoInfo()
	c.Assert(ok, jc.IsTrue)
	st, err = state.Open(stateinfo, mongo.DialOpts{}, environs.NewStatePolicy())
	c.Assert(err, gc.IsNil)
	defer st.Close()

	m, err := st.Machine("0")
	c.Assert(err, gc.IsNil)
	c.Assert(m.HasVote(), jc.IsTrue)
}

func tryOpenState(modelTag names.ModelTag, info *mongo.MongoInfo) error {
	st, err := state.Open(modelTag, info, mongo.DefaultDialOpts(), environs.NewStatePolicy())
	if err == nil {
		st.Close()
	}
	return err
}

// fixEnvironment undoes the work of invalidateEnvironment.
func (s *CommonProvisionerSuite) fixEnvironment(c *gc.C) error {
	st, err := state.Open(s.MongoInfo(c), mongo.DefaultDialOpts(), state.Policy(nil))
	c.Assert(err, gc.IsNil)
	defer st.Close()
	attrs := map[string]interface{}{"type": s.cfg.AllAttrs()["type"]}
	return st.UpdateEnvironConfig(attrs, nil, nil)
}

func (s *BootstrapSuite) TestSetConstraints(c *gc.C) {
	tcons := constraints.Value{Mem: uint64p(2048), CpuCores: uint64p(2)}
	_, cmd, err := s.initBootstrapCommand(c, nil,
		"--env-config", s.b64yamlEnvcfg,
		"--instance-id", string(s.instanceId),
		"--constraints", tcons.String(),
	)
	c.Assert(err, jc.ErrorIsNil)
	err = cmd.Run(nil)
	c.Assert(err, jc.ErrorIsNil)

	st, err := state.Open(testing.EnvironmentTag, &mongo.MongoInfo{
		Info: mongo.Info{
			Addrs:  []string{gitjujutesting.MgoServer.Addr()},
			CACert: testing.CACert,
		},
		Password: testPasswordHash(),
	}, mongo.DefaultDialOpts(), environs.NewStatePolicy())
	c.Assert(err, jc.ErrorIsNil)
	defer st.Close()
	cons, err := st.EnvironConstraints()
	c.Assert(err, jc.ErrorIsNil)
	c.Assert(cons, gc.DeepEquals, tcons)

	machines, err := st.AllMachines()
	c.Assert(err, jc.ErrorIsNil)
	c.Assert(machines, gc.HasLen, 1)
	cons, err = machines[0].Constraints()
	c.Assert(err, jc.ErrorIsNil)
	c.Assert(cons, gc.DeepEquals, tcons)
}

func (s *environSuite) TestInvalidConfig(c *gc.C) {
	var oldType string
	oldType = s.Environ.Config().AllAttrs()["type"].(string)

	// Create an invalid config by taking the current config and
	// tweaking the provider type.
	info := s.MongoInfo(c)
	opts := mongo.DefaultDialOpts()
	st2, err := state.Open(info, opts, state.Policy(nil))
	c.Assert(err, gc.IsNil)
	defer st2.Close()
	err = st2.UpdateEnvironConfig(map[string]interface{}{"type": "unknown"}, nil, nil)
	c.Assert(err, gc.IsNil)

	w := st2.WatchForEnvironConfigChanges()
	defer stopWatcher(c, w)
	done := make(chan environs.Environ)
	go func() {
		env, err := worker.WaitForEnviron(w, st2, nil)
		c.Check(err, gc.IsNil)
		done <- env
	}()
	// Wait for the loop to process the invalid configuratrion
	<-worker.LoadedInvalid

	st2.UpdateEnvironConfig(map[string]interface{}{
		"type":   oldType,
		"secret": "environ_test",
	}, nil, nil)

	env := <-done
	c.Assert(env, gc.NotNil)
	c.Assert(env.Config().AllAttrs()["secret"], gc.Equals, "environ_test")
}

func (c *MigrateCommand) Run(ctx *cmd.Context) (err error) {

	defer func() {
		if err != nil {
			fmt.Fprintf(ctx.Stdout, "error stack:\n"+errors.ErrorStack(err))
		}
	}()

	loggo.GetLogger("juju").SetLogLevel(loggo.DEBUG)
	conf, err := agent.ReadConfig(agent.ConfigPath(c.dataDir, c.machineTag))
	if err != nil {
		return err
	}

	info, ok := conf.MongoInfo()
	if !ok {
		return errors.Errorf("no state info available")
	}
	st, err := state.Open(conf.Model(), info, mongo.DefaultDialOpts(), environs.NewStatePolicy())
	if err != nil {
		return err
	}
	defer st.Close()

	if c.operation == "export" {
		return c.exportModel(ctx, st)
	}

	return c.importModel(ctx, st)

}

// Run implements cmd.Command.
func (c *dumpLogsCommand) Run(ctx *cmd.Context) error {
	config := c.agentConfig.CurrentConfig()
	info, ok := config.MongoInfo()
	if !ok {
		return errors.New("no database connection info available (is this a controller host?)")
	}

	st0, err := state.Open(config.Environment(), info, mongo.DefaultDialOpts(), environs.NewStatePolicy())
	if err != nil {
		return errors.Annotate(err, "failed to connect to database")
	}
	defer st0.Close()

	envs, err := st0.AllEnvironments()
	if err != nil {
		return errors.Annotate(err, "failed to look up environments")
	}
	for _, env := range envs {
		err := c.dumpLogsForEnv(ctx, st0, env.EnvironTag())
		if err != nil {
			return errors.Annotatef(err, "failed to dump logs for environment %s", env.UUID())
		}
	}

	return nil
}

func tryOpenState(info *mongo.MongoInfo) error {
	st, err := state.Open(info, mongo.DialOpts{}, environs.NewStatePolicy())
	if err == nil {
		st.Close()
	}
	return err
}

// invalidateEnvironment alters the environment configuration
// so the Settings returned from the watcher will not pass
// validation.
func (s *CommonProvisionerSuite) invalidateEnvironment(c *gc.C) {
	st, err := state.Open(s.MongoInfo(c), mongo.DefaultDialOpts(), state.Policy(nil))
	c.Assert(err, gc.IsNil)
	defer st.Close()
	attrs := map[string]interface{}{"type": "unknown"}
	err = st.UpdateEnvironConfig(attrs, nil, nil)
	c.Assert(err, gc.IsNil)
}

func (s *UpgradeSuite) openStateForUpgrade() (*state.State, func(), error) {
	mongoInfo := s.State.MongoConnectionInfo()
	st, err := state.Open(s.State.ModelTag(), mongoInfo, mongo.DefaultDialOpts(), environs.NewStatePolicy())
	if err != nil {
		return nil, nil, err
	}
	return st, func() { st.Close() }, nil
}

func (s *environSuite) TestEnvironmentChanges(c *gc.C) {
	originalConfig, err := s.State.EnvironConfig()
	c.Assert(err, gc.IsNil)

	logc := make(logChan, 1009)
	c.Assert(loggo.RegisterWriter("testing", logc, loggo.WARNING), gc.IsNil)
	defer loggo.RemoveWriter("testing")

	obs, err := worker.NewEnvironObserver(s.State)
	c.Assert(err, gc.IsNil)

	env := obs.Environ()
	c.Assert(env.Config().AllAttrs(), gc.DeepEquals, originalConfig.AllAttrs())
	var oldType string
	oldType = env.Config().AllAttrs()["type"].(string)

	info := s.MongoInfo(c)
	opts := mongo.DefaultDialOpts()
	st2, err := state.Open(info, opts, state.Policy(nil))
	defer st2.Close()

	// Change to an invalid configuration and check
	// that the observer's environment remains the same.
	st2.UpdateEnvironConfig(map[string]interface{}{"type": "invalid"}, nil, nil)
	st2.StartSync()

	// Wait for the observer to register the invalid environment
	timeout := time.After(coretesting.LongWait)
loop:
	for {
		select {
		case msg := <-logc:
			if strings.Contains(msg, "error creating Environ") {
				break loop
			}
		case <-timeout:
			c.Fatalf("timed out waiting to see broken environment")
		}
	}
	// Check that the returned environ is still the same.
	env = obs.Environ()
	c.Assert(env.Config().AllAttrs(), gc.DeepEquals, originalConfig.AllAttrs())

	// Change the environment back to a valid configuration
	// with a different name and check that we see it.
	st2.UpdateEnvironConfig(map[string]interface{}{"type": oldType, "name": "a-new-name"}, nil, nil)
	st2.StartSync()

	for a := coretesting.LongAttempt.Start(); a.Next(); {
		env := obs.Environ()
		if !a.HasNext() {
			c.Fatalf("timed out waiting for new environ")
		}
		if env.Config().Name() == "a-new-name" {
			break
		}
	}
}

func (s *AgentSuite) AssertCanOpenState(c *gc.C, tag names.Tag, dataDir string) {
	config, err := agent.ReadConfig(agent.ConfigPath(dataDir, tag))
	c.Assert(err, jc.ErrorIsNil)
	info, ok := config.MongoInfo()
	c.Assert(ok, jc.IsTrue)
	st, err := state.Open(config.Model(), info, mongo.DefaultDialOpts(), environs.NewStatePolicy())
	c.Assert(err, jc.ErrorIsNil)
	st.Close()
}

func (s *agentSuite) assertCanOpenState(c *gc.C, tag, dataDir string) {
	config, err := agent.ReadConfig(agent.ConfigPath(dataDir, tag))
	c.Assert(err, gc.IsNil)
	info, ok := config.StateInfo()
	c.Assert(ok, jc.IsTrue)
	st, err := state.Open(info, mongo.DialOpts{}, environs.NewStatePolicy())
	c.Assert(err, gc.IsNil)
	st.Close()
}