diff options
Diffstat (limited to 'vendor/google.golang.org/grpc/balancer.go')
| -rw-r--r-- | vendor/google.golang.org/grpc/balancer.go | 66 |
1 files changed, 37 insertions, 29 deletions
diff --git a/vendor/google.golang.org/grpc/balancer.go b/vendor/google.golang.org/grpc/balancer.go index 9d943fb..ab65049 100644 --- a/vendor/google.golang.org/grpc/balancer.go +++ b/vendor/google.golang.org/grpc/balancer.go @@ -1,33 +1,18 @@ /* * - * Copyright 2016, Google Inc. - * All rights reserved. + * Copyright 2016 gRPC authors. * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions are - * met: + * 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 * - * * Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * * Redistributions in binary form must reproduce the above - * copyright notice, this list of conditions and the following disclaimer - * in the documentation and/or other materials provided with the - * distribution. - * * Neither the name of Google Inc. nor the names of its - * contributors may be used to endorse or promote products derived from - * this software without specific prior written permission. + * http://www.apache.org/licenses/LICENSE-2.0 * - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR - * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT - * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, - * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT - * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, - * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY - * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT - * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE - * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * 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. * */ @@ -35,6 +20,7 @@ package grpc import ( "fmt" + "net" "sync" "golang.org/x/net/context" @@ -60,6 +46,10 @@ type BalancerConfig struct { // use to dial to a remote load balancer server. The Balancer implementations // can ignore this if it does not need to talk to another party securely. DialCreds credentials.TransportCredentials + // Dialer is the custom dialer the Balancer implementation can use to dial + // to a remote load balancer server. The Balancer implementations + // can ignore this if it doesn't need to talk to remote balancer. + Dialer func(context.Context, string) (net.Conn, error) } // BalancerGetOptions configures a Get call. @@ -167,7 +157,7 @@ type roundRobin struct { func (rr *roundRobin) watchAddrUpdates() error { updates, err := rr.w.Next() if err != nil { - grpclog.Printf("grpc: the naming watcher stops working due to %v.\n", err) + grpclog.Warningf("grpc: the naming watcher stops working due to %v.", err) return err } rr.mu.Lock() @@ -183,7 +173,7 @@ func (rr *roundRobin) watchAddrUpdates() error { for _, v := range rr.addrs { if addr == v.addr { exist = true - grpclog.Println("grpc: The name resolver wanted to add an existing address: ", addr) + grpclog.Infoln("grpc: The name resolver wanted to add an existing address: ", addr) break } } @@ -200,7 +190,7 @@ func (rr *roundRobin) watchAddrUpdates() error { } } default: - grpclog.Println("Unknown update.Op ", update.Op) + grpclog.Errorln("Unknown update.Op ", update.Op) } } // Make a copy of rr.addrs and write it onto rr.addrCh so that gRPC internals gets notified. @@ -211,6 +201,10 @@ func (rr *roundRobin) watchAddrUpdates() error { if rr.done { return ErrClientConnClosing } + select { + case <-rr.addrCh: + default: + } rr.addrCh <- open return nil } @@ -233,7 +227,7 @@ func (rr *roundRobin) Start(target string, config BalancerConfig) error { return err } rr.w = w - rr.addrCh = make(chan []Address) + rr.addrCh = make(chan []Address, 1) go func() { for { if err := rr.watchAddrUpdates(); err != nil { @@ -385,6 +379,9 @@ func (rr *roundRobin) Notify() <-chan []Address { func (rr *roundRobin) Close() error { rr.mu.Lock() defer rr.mu.Unlock() + if rr.done { + return errBalancerClosed + } rr.done = true if rr.w != nil { rr.w.Close() @@ -398,3 +395,14 @@ func (rr *roundRobin) Close() error { } return nil } + +// pickFirst is used to test multi-addresses in one addrConn in which all addresses share the same addrConn. +// It is a wrapper around roundRobin balancer. The logic of all methods works fine because balancer.Get() +// returns the only address Up by resetTransport(). +type pickFirst struct { + *roundRobin +} + +func pickFirstBalancerV1(r naming.Resolver) Balancer { + return &pickFirst{&roundRobin{r: r}} +} |