mirror of https://github.com/grpc/grpc-go.git
105 lines
3.0 KiB
Go
105 lines
3.0 KiB
Go
/*
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*
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* Copyright 2020 gRPC authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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package xdsclient
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import (
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"fmt"
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"sync/atomic"
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"time"
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"google.golang.org/grpc/internal/grpcsync"
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"google.golang.org/grpc/internal/xds/bootstrap"
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)
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const (
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defaultWatchExpiryTimeout = 15 * time.Second
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defaultIdleAuthorityDeleteTimeout = 5 * time.Minute
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)
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var (
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// The following functions are no-ops in the actual code, but can be
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// overridden in tests to give them visibility into certain events.
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xdsClientImplCreateHook = func(name string) {}
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xdsClientImplCloseHook = func(name string) {}
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)
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func clientRefCountedClose(name string) {
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clientsMu.Lock()
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defer clientsMu.Unlock()
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client, ok := clients[name]
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if !ok {
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logger.Errorf("Attempt to close a non-existent xDS client with name %s", name)
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return
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}
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if client.decrRef() != 0 {
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return
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}
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client.clientImpl.close()
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xdsClientImplCloseHook(name)
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delete(clients, name)
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}
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// newRefCounted creates a new reference counted xDS client implementation for
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// name, if one does not exist already. If an xDS client for the given name
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// exists, it gets a reference to it and returns it.
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func newRefCounted(name string, watchExpiryTimeout, idleAuthorityTimeout time.Duration) (XDSClient, func(), error) {
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clientsMu.Lock()
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defer clientsMu.Unlock()
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if c := clients[name]; c != nil {
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c.incrRef()
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return c, grpcsync.OnceFunc(func() { clientRefCountedClose(name) }), nil
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}
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// Create the new client implementation.
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config, err := bootstrap.GetConfiguration()
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if err != nil {
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return nil, nil, fmt.Errorf("xds: failed to get xDS bootstrap config: %v", err)
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}
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c, err := newClientImpl(config, watchExpiryTimeout, idleAuthorityTimeout)
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if err != nil {
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return nil, nil, err
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}
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c.logger.Infof("Created client with name %q and bootstrap configuration:\n %s", name, config)
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client := &clientRefCounted{clientImpl: c, refCount: 1}
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clients[name] = client
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xdsClientImplCreateHook(name)
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logger.Infof("xDS node ID: %s", config.Node().GetId())
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return client, grpcsync.OnceFunc(func() { clientRefCountedClose(name) }), nil
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}
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// clientRefCounted is ref-counted, and to be shared by the xds resolver and
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// balancer implementations, across multiple ClientConns and Servers.
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type clientRefCounted struct {
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*clientImpl
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refCount int32 // accessed atomically
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}
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func (c *clientRefCounted) incrRef() int32 {
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return atomic.AddInt32(&c.refCount, 1)
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}
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func (c *clientRefCounted) decrRef() int32 {
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return atomic.AddInt32(&c.refCount, -1)
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}
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