forked from cockroachdb/cockroach
/
rpc_sender.go
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/
rpc_sender.go
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// Copyright 2015 The Cockroach 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.
//
// Author: Peter Mattis (peter@cockroachlabs.com)
package client
import (
"time"
"golang.org/x/net/context"
"google.golang.org/grpc"
"github.com/cockroachdb/cockroach/roachpb"
"github.com/cockroachdb/cockroach/rpc"
)
const healthyTimeout = 2 * time.Second
type sender struct {
conn *grpc.ClientConn
client roachpb.ExternalClient
}
// NewSender returns an implementation of Sender which exposes the Key-Value
// database provided by a Cockroach cluster by connecting via RPC to a
// Cockroach node.
func NewSender(ctx *rpc.Context, target string) (Sender, error) {
conn, err := ctx.GRPCDial(target)
if err != nil {
return nil, err
}
return &sender{
conn: conn,
client: roachpb.NewExternalClient(conn),
}, nil
}
// Send implements the Sender interface.
func (s *sender) Send(ctx context.Context, ba roachpb.BatchRequest) (*roachpb.BatchResponse, *roachpb.Error) {
ctxWithTimeout, cancel := context.WithTimeout(ctx, healthyTimeout)
defer cancel()
c := s.conn
for state, err := c.State(); state != grpc.Ready; state, err = c.WaitForStateChange(ctxWithTimeout, state) {
if err != nil {
return nil, roachpb.NewErrorf("roachpb.Batch RPC failed: %s", err)
}
if state == grpc.Shutdown {
return nil, roachpb.NewErrorf("roachpb.Batch RPC failed as client connection was closed")
}
}
br, err := s.client.Batch(ctx, &ba)
if err != nil {
return nil, roachpb.NewErrorf("roachpb.Batch RPC failed: %s", err)
}
pErr := br.Error
br.Error = nil
return br, pErr
}