forked from cockroachdb/cockroach
/
server.go
92 lines (81 loc) · 2.82 KB
/
server.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
// 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 (
"github.com/cockroachdb/cockroach/ts/tspb"
gwruntime "github.com/grpc-ecosystem/grpc-gateway/runtime"
"golang.org/x/net/context"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
)
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 {
db *DB
}
// MakeServer instantiates a new Server which services requests with data from
// the supplied DB.
func MakeServer(db *DB) Server {
return Server{
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)
}
// 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) {
if len(request.Queries) == 0 {
return nil, grpc.Errorf(codes.InvalidArgument, "Queries cannot be empty")
}
response := tspb.TimeSeriesQueryResponse{
Results: make([]tspb.TimeSeriesQueryResponse_Result, 0, len(request.Queries)),
}
for _, q := range request.Queries {
datapoints, sources, err := s.db.Query(q, Resolution10s, request.StartNanos, request.EndNanos)
if err != nil {
return nil, grpc.Errorf(codes.Internal, err.Error())
}
result := tspb.TimeSeriesQueryResponse_Result{
Query: q,
Datapoints: datapoints,
}
// TODO(tamird): Remove this (and all other) explicit setting of defaults.
// It is currently required because the client side doesn't know about
// proto defaults.
result.SourceAggregator = q.GetSourceAggregator().Enum()
result.Downsampler = q.GetDownsampler().Enum()
result.Derivative = q.GetDerivative().Enum()
result.Sources = sources
response.Results = append(response.Results, result)
}
return &response, nil
}