initial add - go fmt on grpc
Change-Id: Ib0afadd2fe5571d1456a091f94f5644458f7d3f4
diff --git a/vendor/google.golang.org/grpc/resolver_conn_wrapper.go b/vendor/google.golang.org/grpc/resolver_conn_wrapper.go
new file mode 100644
index 0000000..6934905
--- /dev/null
+++ b/vendor/google.golang.org/grpc/resolver_conn_wrapper.go
@@ -0,0 +1,168 @@
+/*
+ *
+ * Copyright 2017 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package grpc
+
+import (
+ "fmt"
+ "strings"
+ "sync/atomic"
+
+ "google.golang.org/grpc/grpclog"
+ "google.golang.org/grpc/internal/channelz"
+ "google.golang.org/grpc/resolver"
+)
+
+// ccResolverWrapper is a wrapper on top of cc for resolvers.
+// It implements resolver.ClientConnection interface.
+type ccResolverWrapper struct {
+ cc *ClientConn
+ resolver resolver.Resolver
+ addrCh chan []resolver.Address
+ scCh chan string
+ done uint32 // accessed atomically; set to 1 when closed.
+ curState resolver.State
+}
+
+// split2 returns the values from strings.SplitN(s, sep, 2).
+// If sep is not found, it returns ("", "", false) instead.
+func split2(s, sep string) (string, string, bool) {
+ spl := strings.SplitN(s, sep, 2)
+ if len(spl) < 2 {
+ return "", "", false
+ }
+ return spl[0], spl[1], true
+}
+
+// parseTarget splits target into a struct containing scheme, authority and
+// endpoint.
+//
+// If target is not a valid scheme://authority/endpoint, it returns {Endpoint:
+// target}.
+func parseTarget(target string) (ret resolver.Target) {
+ var ok bool
+ ret.Scheme, ret.Endpoint, ok = split2(target, "://")
+ if !ok {
+ return resolver.Target{Endpoint: target}
+ }
+ ret.Authority, ret.Endpoint, ok = split2(ret.Endpoint, "/")
+ if !ok {
+ return resolver.Target{Endpoint: target}
+ }
+ return ret
+}
+
+// newCCResolverWrapper parses cc.target for scheme and gets the resolver
+// builder for this scheme and builds the resolver. The monitoring goroutine
+// for it is not started yet and can be created by calling start().
+//
+// If withResolverBuilder dial option is set, the specified resolver will be
+// used instead.
+func newCCResolverWrapper(cc *ClientConn) (*ccResolverWrapper, error) {
+ rb := cc.dopts.resolverBuilder
+ if rb == nil {
+ return nil, fmt.Errorf("could not get resolver for scheme: %q", cc.parsedTarget.Scheme)
+ }
+
+ ccr := &ccResolverWrapper{
+ cc: cc,
+ addrCh: make(chan []resolver.Address, 1),
+ scCh: make(chan string, 1),
+ }
+
+ var err error
+ ccr.resolver, err = rb.Build(cc.parsedTarget, ccr, resolver.BuildOption{DisableServiceConfig: cc.dopts.disableServiceConfig})
+ if err != nil {
+ return nil, err
+ }
+ return ccr, nil
+}
+
+func (ccr *ccResolverWrapper) resolveNow(o resolver.ResolveNowOption) {
+ ccr.resolver.ResolveNow(o)
+}
+
+func (ccr *ccResolverWrapper) close() {
+ ccr.resolver.Close()
+ atomic.StoreUint32(&ccr.done, 1)
+}
+
+func (ccr *ccResolverWrapper) isDone() bool {
+ return atomic.LoadUint32(&ccr.done) == 1
+}
+
+func (ccr *ccResolverWrapper) UpdateState(s resolver.State) {
+ if ccr.isDone() {
+ return
+ }
+ grpclog.Infof("ccResolverWrapper: sending update to cc: %v", s)
+ if channelz.IsOn() {
+ ccr.addChannelzTraceEvent(s)
+ }
+ ccr.cc.updateResolverState(s)
+ ccr.curState = s
+}
+
+// NewAddress is called by the resolver implementation to send addresses to gRPC.
+func (ccr *ccResolverWrapper) NewAddress(addrs []resolver.Address) {
+ if ccr.isDone() {
+ return
+ }
+ grpclog.Infof("ccResolverWrapper: sending new addresses to cc: %v", addrs)
+ if channelz.IsOn() {
+ ccr.addChannelzTraceEvent(resolver.State{Addresses: addrs, ServiceConfig: ccr.curState.ServiceConfig})
+ }
+ ccr.curState.Addresses = addrs
+ ccr.cc.updateResolverState(ccr.curState)
+}
+
+// NewServiceConfig is called by the resolver implementation to send service
+// configs to gRPC.
+func (ccr *ccResolverWrapper) NewServiceConfig(sc string) {
+ if ccr.isDone() {
+ return
+ }
+ grpclog.Infof("ccResolverWrapper: got new service config: %v", sc)
+ c, err := parseServiceConfig(sc)
+ if err != nil {
+ return
+ }
+ if channelz.IsOn() {
+ ccr.addChannelzTraceEvent(resolver.State{Addresses: ccr.curState.Addresses, ServiceConfig: c})
+ }
+ ccr.curState.ServiceConfig = c
+ ccr.cc.updateResolverState(ccr.curState)
+}
+
+func (ccr *ccResolverWrapper) addChannelzTraceEvent(s resolver.State) {
+ var updates []string
+ oldSC, oldOK := ccr.curState.ServiceConfig.(*ServiceConfig)
+ newSC, newOK := s.ServiceConfig.(*ServiceConfig)
+ if oldOK != newOK || (oldOK && newOK && oldSC.rawJSONString != newSC.rawJSONString) {
+ updates = append(updates, "service config updated")
+ }
+ if len(ccr.curState.Addresses) > 0 && len(s.Addresses) == 0 {
+ updates = append(updates, "resolver returned an empty address list")
+ } else if len(ccr.curState.Addresses) == 0 && len(s.Addresses) > 0 {
+ updates = append(updates, "resolver returned new addresses")
+ }
+ channelz.AddTraceEvent(ccr.cc.channelzID, &channelz.TraceEventDesc{
+ Desc: fmt.Sprintf("Resolver state updated: %+v (%v)", s, strings.Join(updates, "; ")),
+ Severity: channelz.CtINFO,
+ })
+}