Golang log.Errorf函数代码示例

func (s *Server) serveCharm(w http.ResponseWriter, r *http.Request) {
	if !strings.HasPrefix(r.URL.Path, "/charm/") {
		panic("serveCharm: bad url")
	}
	curl, err := charm.ParseURL("cs:" + r.URL.Path[len("/charm/"):])
	if err != nil {
		w.WriteHeader(http.StatusNotFound)
		return
	}
	info, rc, err := s.store.OpenCharm(curl)
	if err == ErrNotFound {
		w.WriteHeader(http.StatusNotFound)
		return
	}
	if err != nil {
		w.WriteHeader(http.StatusInternalServerError)
		log.Errorf("store: cannot open charm %q: %v", curl, err)
		return
	}
	if statsEnabled(r) {
		go s.store.IncCounter(charmStatsKey(curl, "charm-bundle"))
	}
	defer rc.Close()
	w.Header().Set("Connection", "close") // No keep-alive for now.
	w.Header().Set("Content-Type", "application/octet-stream")
	w.Header().Set("Content-Length", strconv.FormatInt(info.BundleSize(), 10))
	_, err = io.Copy(w, rc)
	if err != nil {
		log.Errorf("store: failed to stream charm %q: %v", curl, err)
	}
}

// finish completes the charm writing process and inserts the final metadata.
// After it completes the charm will be available for consumption.
func (w *charmWriter) finish() error {
	if w.file == nil {
		return nil
	}
	defer w.session.Close()
	id := w.file.Id()
	size := w.file.Size()
	err := w.file.Close()
	if err != nil {
		log.Errorf("store: Failed to close GridFS file: %v", err)
		return err
	}
	charms := w.session.Charms()
	sha256 := hex.EncodeToString(w.sha256.Sum(nil))
	charm := charmDoc{
		w.urls,
		w.revision,
		w.digest,
		sha256,
		size,
		id.(bson.ObjectId),
		w.charm.Meta(),
		w.charm.Config(),
	}
	if err = charms.Insert(&charm); err != nil {
		err = maybeConflict(err)
		log.Errorf("store: Failed to insert new revision of charm %v: %v", w.urls, err)
		return err
	}
	return nil
}

// PublishCharmsDistro publishes all branch tips found in
// the /charms distribution in Launchpad onto store under
// the "cs:" scheme.
// apiBase specifies the Launchpad base API URL, such
// as lpad.Production or lpad.Staging.
// Errors found while processing one or more branches are
// all returned as a PublishBranchErrors value.
func PublishCharmsDistro(store *Store, apiBase lpad.APIBase) error {
	oauth := &lpad.OAuth{Anonymous: true, Consumer: "juju"}
	root, err := lpad.Login(apiBase, oauth)
	if err != nil {
		return err
	}
	distro, err := root.Distro("charms")
	if err != nil {
		return err
	}
	tips, err := distro.BranchTips(time.Time{})
	if err != nil {
		return err
	}

	var errs PublishBranchErrors
	for _, tip := range tips {
		if !strings.HasSuffix(tip.UniqueName, "/trunk") {
			continue
		}
		burl, curl, err := uniqueNameURLs(tip.UniqueName)
		if err != nil {
			errs = append(errs, PublishBranchError{tip.UniqueName, err})
			log.Errorf("%v\n", err)
			continue
		}
		log.Infof("----- %s\n", burl)
		if tip.Revision == "" {
			errs = append(errs, PublishBranchError{burl, fmt.Errorf("branch has no revisions")})
			log.Errorf("branch has no revisions\n")
			continue
		}
		// Charm is published in the personal URL and in any explicitly
		// assigned official series.
		urls := []*charm.URL{curl}
		schema, name := curl.Schema, curl.Name
		for _, series := range tip.OfficialSeries {
			curl = &charm.URL{Schema: schema, Name: name, Series: series, Revision: -1}
			curl.Series = series
			curl.User = ""
			urls = append(urls, curl)
		}

		err = PublishBazaarBranch(store, urls, burl, tip.Revision)
		if err == ErrRedundantUpdate {
			continue
		}
		if err != nil {
			errs = append(errs, PublishBranchError{burl, err})
			log.Errorf("%v\n", err)
		}
	}
	if errs != nil {
		return errs
	}
	return nil
}

func (p *Provisioner) startMachine(m *state.Machine) error {
	// TODO(dfc) the state.Info passed to environ.StartInstance remains contentious
	// however as the PA only knows one state.Info, and that info is used by MAs and
	// UAs to locate the state for this environment, it is logical to use the same
	// state.Info as the PA.
	stateInfo, apiInfo, err := p.setupAuthentication(m)
	if err != nil {
		return err
	}
	cons, err := m.Constraints()
	if err != nil {
		return err
	}
	// Generate a unique nonce for the new instance.
	uuid, err := utils.NewUUID()
	if err != nil {
		return err
	}
	// Generated nonce has the format: "machine-#:UUID". The first
	// part is a badge, specifying the tag of the machine the provisioner
	// is running on, while the second part is a random UUID.
	nonce := fmt.Sprintf("%s:%s", state.MachineTag(p.machineId), uuid.String())
	inst, err := p.environ.StartInstance(m.Id(), nonce, m.Series(), cons, stateInfo, apiInfo)
	if err != nil {
		// Set the state to error, so the machine will be skipped next
		// time until the error is resolved, but don't return an
		// error; just keep going with the other machines.
		log.Errorf("worker/provisioner: cannot start instance for machine %q: %v", m, err)
		if err1 := m.SetStatus(params.StatusError, err.Error()); err1 != nil {
			// Something is wrong with this machine, better report it back.
			log.Errorf("worker/provisioner: cannot set error status for machine %q: %v", m, err1)
			return err1
		}
		return nil
	}
	if err := m.SetProvisioned(inst.Id(), nonce); err != nil {
		// The machine is started, but we can't record the mapping in
		// state. It'll keep running while we fail out and restart,
		// but will then be detected by findUnknownInstances and
		// killed again.
		//
		// TODO(dimitern) Stop the instance right away here.
		//
		// Multiple instantiations of a given machine (with the same
		// machine ID) cannot coexist, because findUnknownInstances is
		// called before startMachines. However, if the first machine
		// had started to do work before being replaced, we may
		// encounter surprising problems.
		return err
	}
	// populate the local cache
	p.instances[m.Id()] = inst
	p.machines[inst.Id()] = m.Id()
	log.Noticef("worker/provisioner: started machine %s as instance %s", m, inst.Id())
	return nil
}

// tryLock tries locking l.keys, one at a time, and succeeds only if it
// can lock all of them in order. The keys should be pre-sorted so that
// two-way conflicts can't happen. If any of the keys fail to be locked,
// and expiring the old lock doesn't work, tryLock undoes all previous
// locks and aborts with an error.
func (l *UpdateLock) tryLock() error {
	for i, key := range l.keys {
		log.Debugf("store: Trying to lock charm %s for updates...", key)
		doc := bson.D{{"_id", key}, {"time", l.time}}
		err := l.locks.Insert(doc)
		if err == nil {
			log.Debugf("store: Charm %s is now locked for updates.", key)
			continue
		}
		if lerr, ok := err.(*mgo.LastError); ok && lerr.Code == 11000 {
			log.Debugf("store: Charm %s is locked. Trying to expire lock.", key)
			l.tryExpire(key)
			err = l.locks.Insert(doc)
			if err == nil {
				log.Debugf("store: Charm %s is now locked for updates.", key)
				continue
			}
		}
		// Couldn't lock everyone. Undo previous locks.
		for j := i - 1; j >= 0; j-- {
			// Using time below should be unnecessary, but it's an extra check.
			// Can't do anything about errors here. Lock will expire anyway.
			l.locks.Remove(bson.D{{"_id", l.keys[j]}, {"time", l.time}})
		}
		err = maybeConflict(err)
		log.Errorf("store: Can't lock charms %v for updating: %v", l.keys, err)
		return err
	}
	return nil
}

func (s *Store) ensureIndexes() error {
	session := s.session
	indexes := []struct {
		c *mgo.Collection
		i mgo.Index
	}{{
		session.StatCounters(),
		mgo.Index{Key: []string{"k", "t"}, Unique: true},
	}, {
		session.StatTokens(),
		mgo.Index{Key: []string{"t"}, Unique: true},
	}, {
		session.Charms(),
		mgo.Index{Key: []string{"urls", "revision"}, Unique: true},
	}, {
		session.Events(),
		mgo.Index{Key: []string{"urls", "digest"}},
	}}
	for _, idx := range indexes {
		err := idx.c.EnsureIndex(idx.i)
		if err != nil {
			log.Errorf("store: Error ensuring stat.counters index: %v", err)
			return err
		}
	}
	return nil
}

func (c *closeWorker) Wait() error {
	err := c.worker.Wait()
	if err := c.closer.Close(); err != nil {
		log.Errorf("closeWorker: close error: %v", err)
	}
	return err
}

// newFilter returns a filter that handles state changes pertaining to the
// supplied unit.
func newFilter(st *state.State, unitName string) (*filter, error) {
	f := &filter{
		st:                st,
		outUnitDying:      make(chan struct{}),
		outConfig:         make(chan struct{}),
		outConfigOn:       make(chan struct{}),
		outUpgrade:        make(chan *charm.URL),
		outUpgradeOn:      make(chan *charm.URL),
		outResolved:       make(chan state.ResolvedMode),
		outResolvedOn:     make(chan state.ResolvedMode),
		outRelations:      make(chan []int),
		outRelationsOn:    make(chan []int),
		wantForcedUpgrade: make(chan bool),
		wantResolved:      make(chan struct{}),
		discardConfig:     make(chan struct{}),
		setCharm:          make(chan *charm.URL),
		didSetCharm:       make(chan struct{}),
		clearResolved:     make(chan struct{}),
		didClearResolved:  make(chan struct{}),
	}
	go func() {
		defer f.tomb.Done()
		err := f.loop(unitName)
		log.Errorf("worker/uniter/filter: %v", err)
		f.tomb.Kill(err)
	}()
	return f, nil
}

// CharmInfo retrieves the CharmInfo value for the charm at url.
func (s *Store) CharmInfo(url *charm.URL) (info *CharmInfo, err error) {
	session := s.session.Copy()
	defer session.Close()

	log.Debugf("store: Retrieving charm info for %s", url)
	rev := url.Revision
	url = url.WithRevision(-1)

	charms := session.Charms()
	var cdoc charmDoc
	var qdoc interface{}
	if rev == -1 {
		qdoc = bson.D{{"urls", url}}
	} else {
		qdoc = bson.D{{"urls", url}, {"revision", rev}}
	}
	err = charms.Find(qdoc).Sort("-revision").One(&cdoc)
	if err != nil {
		log.Errorf("store: Failed to find charm %s: %v", url, err)
		return nil, ErrNotFound
	}
	info = &CharmInfo{
		cdoc.Revision,
		cdoc.Digest,
		cdoc.Sha256,
		cdoc.Size,
		cdoc.FileId,
		cdoc.Meta,
		cdoc.Config,
	}
	return info, nil
}

func (srv *Server) run(lis net.Listener) {
	defer srv.tomb.Done()
	defer srv.wg.Wait() // wait for any outstanding requests to complete.
	srv.wg.Add(1)
	go func() {
		<-srv.tomb.Dying()
		lis.Close()
		srv.wg.Done()
	}()
	handler := websocket.Handler(func(conn *websocket.Conn) {
		srv.wg.Add(1)
		defer srv.wg.Done()
		// If we've got to this stage and the tomb is still
		// alive, we know that any tomb.Kill must occur after we
		// have called wg.Add, so we avoid the possibility of a
		// handler goroutine running after Stop has returned.
		if srv.tomb.Err() != tomb.ErrStillAlive {
			return
		}
		if err := srv.serveConn(conn); err != nil {
			log.Errorf("state/api: error serving RPCs: %v", err)
		}
	})
	// The error from http.Serve is not interesting.
	http.Serve(lis, handler)
}

// Run executes the subcommand that was selected in Init.
func (c *SuperCommand) Run(ctx *Context) error {
	if c.showDescription {
		if c.Purpose != "" {
			fmt.Fprintf(ctx.Stdout, "%s\n", c.Purpose)
		} else {
			fmt.Fprintf(ctx.Stdout, "%s: no description available\n", c.Info().Name)
		}
		return nil
	}
	if c.subcmd == nil {
		panic("Run: missing subcommand; Init failed or not called")
	}
	if c.Log != nil {
		if err := c.Log.Start(ctx); err != nil {
			return err
		}
	}
	err := c.subcmd.Run(ctx)
	if err != nil && err != ErrSilent {
		log.Errorf("command failed: %v", err)
	} else {
		log.Infof("command finished")
	}
	return err
}

// Open connects to the server described by the given
// info, waits for it to be initialized, and returns a new State
// representing the environment connected to.
// It returns unauthorizedError if access is unauthorized.
func Open(info *Info, opts DialOpts) (*State, error) {
	log.Infof("state: opening state; mongo addresses: %q; entity %q", info.Addrs, info.Tag)
	if len(info.Addrs) == 0 {
		return nil, stderrors.New("no mongo addresses")
	}
	if len(info.CACert) == 0 {
		return nil, stderrors.New("missing CA certificate")
	}
	xcert, err := cert.ParseCert(info.CACert)
	if err != nil {
		return nil, fmt.Errorf("cannot parse CA certificate: %v", err)
	}
	pool := x509.NewCertPool()
	pool.AddCert(xcert)
	tlsConfig := &tls.Config{
		RootCAs:    pool,
		ServerName: "anything",
	}
	dial := func(addr net.Addr) (net.Conn, error) {
		c, err := net.Dial("tcp", addr.String())
		if err != nil {
			log.Errorf("state: connection failed, will retry: %v", err)
			return nil, err
		}
		cc := tls.Client(c, tlsConfig)
		if err := cc.Handshake(); err != nil {
			log.Errorf("state: TLS handshake failed: %v", err)
			return nil, err
		}
		return cc, nil
	}
	session, err := mgo.DialWithInfo(&mgo.DialInfo{
		Addrs:   info.Addrs,
		Timeout: opts.Timeout,
		Dial:    dial,
	})
	if err != nil {
		return nil, err
	}
	log.Infof("state: connection established")
	st, err := newState(session, info)
	if err != nil {
		session.Close()
		return nil, err
	}
	return st, nil
}

func (c *Cleaner) Handle() error {
	if err := c.st.Cleanup(); err != nil {
		log.Errorf("worker/cleaner: cannot cleanup state: %v", err)
	}
	// We do not return the err from Cleanup, because we don't want to stop
	// the loop as a failure
	return nil
}

// forgetUnit cleans the unit data after the unit is removed.
func (fw *Firewaller) forgetUnit(unitd *unitData) {
	name := unitd.unit.Name()
	serviced := unitd.serviced
	machined := unitd.machined
	if err := unitd.Stop(); err != nil {
		log.Errorf("worker/firewaller: unit watcher %q returned error when stopping: %v", name, err)
	}
	// Clean up after stopping.
	delete(fw.unitds, name)
	delete(machined.unitds, name)
	delete(serviced.unitds, name)
	if len(serviced.unitds) == 0 {
		// Stop service data after all units are removed.
		if err := serviced.Stop(); err != nil {
			log.Errorf("worker/firewaller: service watcher %q returned error when stopping: %v", serviced.service, err)
		}
		delete(fw.serviceds, serviced.service.Name())
	}
}

// mustLackRevision returns an error if any of the urls has a revision.
func mustLackRevision(context string, urls ...*charm.URL) error {
	for _, url := range urls {
		if url.Revision != -1 {
			err := fmt.Errorf("%s: got charm URL with revision: %s", context, url)
			log.Errorf("store: %v", err)
			return err
		}
	}
	return nil
}