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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 (
"io/ioutil"
"net/http"
"github.com/cockroachdb/cockroach/util"
"github.com/julienschmidt/httprouter"
)
const (
// URLPrefix is the prefix for all time series endpoints hosted by the
// server.
URLPrefix = "/ts/"
// URLQuery is the relative URL which should accept query requests.
URLQuery = URLPrefix + "query"
)
// Server handles incoming external requests related to time series data.
type Server struct {
db *DB
router *httprouter.Router
}
// NewServer instantiates a new Server which services requests with data from
// the supplied DB.
func NewServer(db *DB) *Server {
server := &Server{
db: db,
router: httprouter.New(),
}
server.router.POST(URLQuery, server.handleQuery)
return server
}
// ServeHTTP implements the http.Handler interface.
func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
s.router.ServeHTTP(w, r)
}
// handleQuery handles an incoming HTTP query request. Each query requests data
// for one or more metrics over a specific time span. Query requests have a
// significant body and thus are POST requests.
func (s *Server) handleQuery(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
request := TimeSeriesQueryRequest{}
// Unmarshal query request.
reqBody, err := ioutil.ReadAll(r.Body)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
if err := util.UnmarshalRequest(r, reqBody, &request, util.AllEncodings); err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
if len(request.Queries) == 0 {
http.Error(w, "time series query requests must specify at least one query.", http.StatusBadRequest)
return
}
response := TimeSeriesQueryResponse{
Results: make([]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 {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
result := 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)
}
// Marshal and return response.
b, contentType, err := util.MarshalResponse(r, &response, util.AllEncodings)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
w.Header().Set(util.ContentTypeHeader, contentType)
if _, err := w.Write(b); err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
}