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server.go
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server.go
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// Copyright (c) 2018 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package remote
import (
"net"
rpc "github.com/m3db/m3/src/query/generated/proto/rpcpb"
"github.com/m3db/m3/src/query/pools"
"github.com/m3db/m3/src/query/storage/m3"
"github.com/m3db/m3/src/query/util/logging"
"go.uber.org/zap"
"google.golang.org/grpc"
)
// TODO: add metrics
type grpcServer struct {
storage m3.Storage
poolWrapper *pools.PoolWrapper
}
// CreateNewGrpcServer builds a grpc server which must be started later
func CreateNewGrpcServer(
store m3.Storage,
poolWrapper *pools.PoolWrapper,
) *grpc.Server {
server := grpc.NewServer()
grpcServer := &grpcServer{
storage: store,
poolWrapper: poolWrapper,
}
rpc.RegisterQueryServer(server, grpcServer)
return server
}
// StartNewGrpcServer starts server on given address, then notifies channel
func StartNewGrpcServer(
server *grpc.Server,
address string,
waitForStart chan<- struct{},
) error {
lis, err := net.Listen("tcp", address)
if err != nil {
return err
}
waitForStart <- struct{}{}
return server.Serve(lis)
}
// Fetch reads decompressed series from m3 storage
func (s *grpcServer) Fetch(
message *rpc.FetchRequest,
stream rpc.Query_FetchServer,
) error {
ctx := RetrieveMetadata(stream.Context())
logger := logging.WithContext(ctx)
storeQuery, err := DecodeFetchRequest(message)
if err != nil {
logger.Error("unable to decode fetch query", zap.Any("error", err))
return err
}
result, cleanup, err := s.storage.FetchRaw(ctx, storeQuery, nil)
defer cleanup()
if err != nil {
logger.Error("unable to fetch local query", zap.Error(err))
return err
}
available, pools, err, poolCh, errCh := s.poolWrapper.IteratorPools()
if err != nil {
return err
}
if !available {
select {
case pools = <-poolCh:
case err = <-errCh:
return err
}
}
response, err := EncodeToCompressedFetchResult(result, pools)
if err != nil {
logger.Error("unable to compress query", zap.Error(err))
return err
}
err = stream.Send(response)
if err != nil {
logger.Error("unable to send fetch result", zap.Error(err))
}
return err
}