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query.go
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/
query.go
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// Copyright 2014 The Cayley Authors. All rights reserved.
//
// 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 http
import (
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"github.com/julienschmidt/httprouter"
"github.com/google/cayley/query"
"github.com/google/cayley/query/gremlin"
"github.com/google/cayley/query/mql"
)
type SuccessQueryWrapper struct {
Result interface{} `json:"result"`
}
type ErrorQueryWrapper struct {
Error string `json:"error"`
}
func WrapErrResult(err error) ([]byte, error) {
var wrap ErrorQueryWrapper
wrap.Error = err.Error()
return json.MarshalIndent(wrap, "", " ")
}
func WrapResult(result interface{}) ([]byte, error) {
var wrap SuccessQueryWrapper
wrap.Result = result
return json.MarshalIndent(wrap, "", " ")
}
func Run(q string, ses query.HTTP) (interface{}, error) {
c := make(chan interface{}, 5)
go ses.Execute(q, c, 100)
for res := range c {
ses.Collate(res)
}
return ses.Results()
}
func GetQueryShape(q string, ses query.HTTP) ([]byte, error) {
s, err := ses.ShapeOf(q)
if err != nil {
return nil, err
}
return json.Marshal(s)
}
// TODO(barakmich): Turn this into proper middleware.
func (api *API) ServeV1Query(w http.ResponseWriter, r *http.Request, params httprouter.Params) int {
h, err := api.GetHandleForRequest(r)
var ses query.HTTP
switch params.ByName("query_lang") {
case "gremlin":
ses = gremlin.NewSession(h.QuadStore, api.config.Timeout, false)
case "mql":
ses = mql.NewSession(h.QuadStore)
default:
return jsonResponse(w, 400, "Need a query language.")
}
bodyBytes, err := ioutil.ReadAll(r.Body)
if err != nil {
return jsonResponse(w, 400, err)
}
code := string(bodyBytes)
result, err := ses.Parse(code)
switch result {
case query.Parsed:
var output interface{}
var bytes []byte
var err error
output, err = Run(code, ses)
if err != nil {
bytes, err = WrapErrResult(err)
http.Error(w, string(bytes), 400)
ses = nil
return 400
}
bytes, err = WrapResult(output)
if err != nil {
ses = nil
return jsonResponse(w, 400, err)
}
fmt.Fprint(w, string(bytes))
ses = nil
return 200
case query.ParseFail:
ses = nil
return jsonResponse(w, 400, err)
default:
ses = nil
return jsonResponse(w, 500, "Incomplete data?")
}
}
func (api *API) ServeV1Shape(w http.ResponseWriter, r *http.Request, params httprouter.Params) int {
h, err := api.GetHandleForRequest(r)
var ses query.HTTP
switch params.ByName("query_lang") {
case "gremlin":
ses = gremlin.NewSession(h.QuadStore, api.config.Timeout, false)
case "mql":
ses = mql.NewSession(h.QuadStore)
default:
return jsonResponse(w, 400, "Need a query language.")
}
bodyBytes, err := ioutil.ReadAll(r.Body)
if err != nil {
return jsonResponse(w, 400, err)
}
code := string(bodyBytes)
result, err := ses.Parse(code)
switch result {
case query.Parsed:
var output []byte
var err error
output, err = GetQueryShape(code, ses)
if err != nil {
return jsonResponse(w, 400, err)
}
fmt.Fprint(w, string(output))
return 200
case query.ParseFail:
return jsonResponse(w, 400, err)
default:
return jsonResponse(w, 500, "Incomplete data?")
}
}