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server.go
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server.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: Matt Tracy (matt@cockroachlabs.com)
package ts
import (
"golang.org/x/net/context"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"github.com/cockroachdb/cockroach/ts/tspb"
"github.com/cockroachdb/cockroach/util/log"
gwruntime "github.com/grpc-ecosystem/grpc-gateway/runtime"
)
const (
// URLPrefix is the prefix for all time series endpoints hosted by the
// server.
URLPrefix = "/ts/"
)
// Server handles incoming external requests related to time series data.
type Server struct {
ctx context.Context
db *DB
}
// MakeServer instantiates a new Server which services requests with data from
// the supplied DB.
func MakeServer(ctx context.Context, db *DB) Server {
ctx = log.WithLogTag(ctx, "ts-srv", nil)
return Server{
ctx: ctx,
db: db,
}
}
// RegisterService registers the GRPC service.
func (s *Server) RegisterService(g *grpc.Server) {
tspb.RegisterTimeSeriesServer(g, s)
}
// RegisterGateway starts the gateway (i.e. reverse proxy) that proxies HTTP requests
// to the appropriate gRPC endpoints.
func (s *Server) RegisterGateway(
ctx context.Context, mux *gwruntime.ServeMux, conn *grpc.ClientConn,
) error {
return tspb.RegisterTimeSeriesHandler(ctx, mux, conn)
}
// logContext applies the log tags from the Server's context to the given
// context.
func (s *Server) logContext(ctx context.Context) context.Context {
return log.WithLogTagsFromCtx(ctx, s.ctx)
}
// Query is an endpoint that returns data for one or more metrics over a
// specific time span.
func (s *Server) Query(
ctx context.Context, request *tspb.TimeSeriesQueryRequest,
) (*tspb.TimeSeriesQueryResponse, error) {
ctx = s.logContext(ctx)
if len(request.Queries) == 0 {
return nil, grpc.Errorf(codes.InvalidArgument, "Queries cannot be empty")
}
// If not set, sampleNanos should default to ten second resolution.
sampleNanos := request.SampleNanos
if sampleNanos == 0 {
sampleNanos = Resolution10s.SampleDuration()
}
response := tspb.TimeSeriesQueryResponse{
Results: make([]tspb.TimeSeriesQueryResponse_Result, 0, len(request.Queries)),
}
for _, query := range request.Queries {
datapoints, sources, err := s.db.Query(
ctx,
query,
Resolution10s,
sampleNanos,
request.StartNanos,
request.EndNanos,
)
if err != nil {
return nil, grpc.Errorf(codes.Internal, err.Error())
}
result := tspb.TimeSeriesQueryResponse_Result{
Query: query,
Datapoints: datapoints,
}
result.Sources = sources
response.Results = append(response.Results, result)
}
return &response, nil
}