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cayley_http_write.go
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cayley_http_write.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"
"errors"
"fmt"
"io/ioutil"
"net/http"
"strconv"
"github.com/barakmich/glog"
"github.com/julienschmidt/httprouter"
"github.com/google/cayley/graph"
"github.com/google/cayley/nquads"
)
func ParseJsonToTripleList(jsonBody []byte) ([]*graph.Triple, error) {
var tripleList []*graph.Triple
err := json.Unmarshal(jsonBody, &tripleList)
if err != nil {
return nil, err
}
for i, t := range tripleList {
if !t.IsValid() {
return nil, errors.New(fmt.Sprintf("Invalid triple at index %d. %s", i, t.ToString()))
}
}
return tripleList, nil
}
func (api *Api) ServeV1Write(w http.ResponseWriter, r *http.Request, _ httprouter.Params) int {
if api.config.ReadOnly {
return FormatJson400(w, "Database is read-only.")
}
bodyBytes, err := ioutil.ReadAll(r.Body)
if err != nil {
return FormatJson400(w, err)
}
tripleList, terr := ParseJsonToTripleList(bodyBytes)
if terr != nil {
return FormatJson400(w, terr)
}
api.ts.AddTripleSet(tripleList)
fmt.Fprintf(w, "{\"result\": \"Successfully wrote %d triples.\"}", len(tripleList))
return 200
}
func (api *Api) ServeV1WriteNQuad(w http.ResponseWriter, r *http.Request, params httprouter.Params) int {
if api.config.ReadOnly {
return FormatJson400(w, "Database is read-only.")
}
formFile, _, err := r.FormFile("NQuadFile")
if err != nil {
glog.Errorln(err)
return FormatJsonError(w, 500, "Couldn't read file: "+err.Error())
}
defer formFile.Close()
blockSize, blockErr := strconv.ParseInt(r.URL.Query().Get("block_size"), 10, 64)
if blockErr != nil {
blockSize = int64(api.config.LoadSize)
}
tChan := make(chan *graph.Triple)
go nquads.ReadNQuadsFromReader(tChan, formFile)
tripleblock := make([]*graph.Triple, blockSize)
nTriples := 0
i := int64(0)
for t := range tChan {
tripleblock[i] = t
i++
nTriples++
if i == blockSize {
api.ts.AddTripleSet(tripleblock)
i = 0
}
}
api.ts.AddTripleSet(tripleblock[0:i])
fmt.Fprintf(w, "{\"result\": \"Successfully wrote %d triples.\"}", nTriples)
return 200
}
func (api *Api) ServeV1Delete(w http.ResponseWriter, r *http.Request, params httprouter.Params) int {
if api.config.ReadOnly {
return FormatJson400(w, "Database is read-only.")
}
bodyBytes, err := ioutil.ReadAll(r.Body)
if err != nil {
return FormatJson400(w, err)
}
tripleList, terr := ParseJsonToTripleList(bodyBytes)
if terr != nil {
return FormatJson400(w, terr)
}
count := 0
for _, triple := range tripleList {
api.ts.RemoveTriple(triple)
count++
}
fmt.Fprintf(w, "{\"result\": \"Successfully deleted %d triples.\"}", count)
return 200
}