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client_loadreport.go
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client_loadreport.go
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/*
*
* Copyright 2019 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 client
import (
"context"
"google.golang.org/grpc"
"google.golang.org/grpc/grpclog"
"google.golang.org/grpc/xds/internal/balancer/lrs"
)
// ReportLoad sends the load of the given clusterName from loadStore to the
// given server. If the server is not an empty string, and is different from the
// xds server, a new ClientConn will be created.
//
// The same options used for creating the Client will be used (including
// NodeProto, and dial options if necessary).
//
// It returns a function to cancel the load reporting stream. If server is
// different from xds server, the ClientConn will also be closed.
func (c *Client) ReportLoad(server string, clusterName string, loadStore lrs.Store) func() {
var (
cc *grpc.ClientConn
closeCC bool
)
if server == "" || server == c.opts.Config.BalancerName {
cc = c.cc
} else {
dopts := append([]grpc.DialOption{c.opts.Config.Creds}, c.opts.DialOpts...)
ccNew, err := grpc.Dial(server, dopts...)
if err != nil {
// An error from a non-blocking dial indicates something serious.
grpclog.Infof("xds: failed to dial load report server {%s}: %v", server, err)
return func() {}
}
cc = ccNew
closeCC = true
}
ctx, cancel := context.WithCancel(context.Background())
go loadStore.ReportTo(ctx, c.cc, clusterName, c.opts.Config.NodeProto)
return func() {
cancel()
if closeCC {
cc.Close()
}
}
}