forked from dgraph-io/dgraph
/
main.go
135 lines (121 loc) · 3.82 KB
/
main.go
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/*
* Copyright 2015 Manish R Jain <manishrjain@gmail.com>
*
* 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 main
import (
"flag"
"fmt"
"io/ioutil"
"net/http"
"runtime"
"time"
"github.com/Sirupsen/logrus"
"github.com/dgraph-io/dgraph/commit"
"github.com/dgraph-io/dgraph/gql"
"github.com/dgraph-io/dgraph/posting"
"github.com/dgraph-io/dgraph/query"
"github.com/dgraph-io/dgraph/store"
"github.com/dgraph-io/dgraph/x"
)
var glog = x.Log("server")
var postingDir = flag.String("postings", "", "Directory to store posting lists")
var mutationDir = flag.String("mutations", "", "Directory to store mutations")
var port = flag.String("port", "8080", "Port to run server on.")
var numcpu = flag.Int("numCpu", runtime.NumCPU(), "Number of cores to be used by the process")
func addCorsHeaders(w http.ResponseWriter) {
w.Header().Set("Access-Control-Allow-Origin", "*")
w.Header().Set("Access-Control-Allow-Methods", "POST, OPTIONS")
w.Header().Set("Access-Control-Allow-Headers",
"Content-Type, Content-Length, Accept-Encoding, X-CSRF-Token, X-Auth-Token, Cache-Control, X-Requested-With")
w.Header().Set("Access-Control-Allow-Credentials", "true")
w.Header().Set("Connection", "close")
}
func queryHandler(w http.ResponseWriter, r *http.Request) {
addCorsHeaders(w)
if r.Method == "OPTIONS" {
return
}
if r.Method != "POST" {
x.SetStatus(w, x.E_INVALID_METHOD, "Invalid method")
return
}
var l query.Latency
l.Start = time.Now()
defer r.Body.Close()
q, err := ioutil.ReadAll(r.Body)
if err != nil || len(q) == 0 {
x.Err(glog, err).Error("While reading query")
x.SetStatus(w, x.E_INVALID_REQUEST, "Invalid request encountered.")
return
}
glog.WithField("q", string(q)).Debug("Query received.")
sg, err := gql.Parse(string(q))
if err != nil {
x.Err(glog, err).Error("While parsing query")
x.SetStatus(w, x.E_INVALID_REQUEST, err.Error())
return
}
l.Parsing = time.Since(l.Start)
glog.WithField("q", string(q)).Debug("Query parsed.")
rch := make(chan error)
go query.ProcessGraph(sg, rch)
err = <-rch
if err != nil {
x.Err(glog, err).Error("While executing query")
x.SetStatus(w, x.E_ERROR, err.Error())
return
}
l.Processing = time.Since(l.Start) - l.Parsing
glog.WithField("q", string(q)).Debug("Graph processed.")
js, err := sg.ToJson(&l)
if err != nil {
x.Err(glog, err).Error("While converting to Json.")
x.SetStatus(w, x.E_ERROR, err.Error())
return
}
glog.WithFields(logrus.Fields{
"total": time.Since(l.Start),
"parsing": l.Parsing,
"process": l.Processing,
"json": l.Json,
}).Info("Query Latencies")
w.Header().Set("Content-Type", "application/json")
fmt.Fprint(w, string(js))
}
func main() {
flag.Parse()
if !flag.Parsed() {
glog.Fatal("Unable to parse flags")
}
logrus.SetLevel(logrus.InfoLevel)
numCpus := *numcpu
prev := runtime.GOMAXPROCS(numCpus)
glog.WithField("num_cpu", numCpus).
WithField("prev_maxprocs", prev).
Info("Set max procs to num cpus")
ps := new(store.Store)
ps.Init(*postingDir)
defer ps.Close()
clog := commit.NewLogger(*mutationDir, "dgraph", 50<<20)
clog.SyncEvery = 1
clog.Init()
defer clog.Close()
posting.Init(ps, clog)
http.HandleFunc("/query", queryHandler)
glog.WithField("port", *port).Info("Listening for requests...")
if err := http.ListenAndServe(":"+*port, nil); err != nil {
x.Err(glog, err).Fatal("ListenAndServe")
}
}