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worker.go
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worker.go
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/*
* Copyright 2016 DGraph Labs, Inc.
*
* 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 worker contains code for internal worker communication to perform
// queries and mutations.
package worker
import (
"flag"
"fmt"
"log"
"net"
"sync"
"github.com/dgraph-io/dgraph/store"
"golang.org/x/net/context"
"google.golang.org/grpc"
)
var (
workerPort = flag.Int("workerport", 12345,
"Port used by worker for internal communication.")
backupPath = flag.String("backup", "backup",
"Folder in which to store backups.")
pstore *store.Store
)
func Init(ps *store.Store) {
pstore = ps
}
// grpcWorker struct implements the gRPC server interface.
type grpcWorker struct {
sync.Mutex
reqids map[uint64]bool
}
// addIfNotPresent returns false if it finds the reqid already present.
// Otherwise, adds the reqid in the list, and returns true.
func (w *grpcWorker) addIfNotPresent(reqid uint64) bool {
w.Lock()
defer w.Unlock()
if w.reqids == nil {
w.reqids = make(map[uint64]bool)
} else if _, has := w.reqids[reqid]; has {
return false
}
w.reqids[reqid] = true
return true
}
// Hello rpc call is used to check connection with other workers after worker
// tcp server for this instance starts.
func (w *grpcWorker) Echo(ctx context.Context, in *Payload) (*Payload, error) {
return &Payload{Data: in.Data}, nil
}
// runServer initializes a tcp server on port which listens to requests from
// other workers for internal communication.
func RunServer() {
ln, err := net.Listen("tcp", fmt.Sprintf(":%d", *workerPort))
if err != nil {
log.Fatalf("While running server: %v", err)
return
}
log.Printf("Worker listening at address: %v", ln.Addr())
s := grpc.NewServer()
RegisterWorkerServer(s, &grpcWorker{})
s.Serve(ln)
}
// StoreStats returns stats for data store.
func StoreStats() string {
return pstore.GetStats()
}