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configtxlator_handlers.go
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/
configtxlator_handlers.go
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/*
Copyright IBM Corp. 2017 All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package rest
import (
"fmt"
"io/ioutil"
"net/http"
"github.com/golang/protobuf/proto"
cb "github.com/hyperledger/fabric-protos-go/common"
"github.com/hyperledger/fabric/internal/configtxlator/update"
)
func fieldBytes(fieldName string, r *http.Request) ([]byte, error) {
fieldFile, _, err := r.FormFile(fieldName)
if err != nil {
return nil, err
}
defer fieldFile.Close()
return ioutil.ReadAll(fieldFile)
}
func fieldConfigProto(fieldName string, r *http.Request) (*cb.Config, error) {
fieldBytes, err := fieldBytes(fieldName, r)
if err != nil {
return nil, fmt.Errorf("error reading field bytes: %s", err)
}
config := &cb.Config{}
err = proto.Unmarshal(fieldBytes, config)
if err != nil {
return nil, fmt.Errorf("error unmarshaling field bytes: %s", err)
}
return config, nil
}
func ComputeUpdateFromConfigs(w http.ResponseWriter, r *http.Request) {
originalConfig, err := fieldConfigProto("original", r)
if err != nil {
w.WriteHeader(http.StatusBadRequest)
fmt.Fprintf(w, "Error with field 'original': %s\n", err)
return
}
updatedConfig, err := fieldConfigProto("updated", r)
if err != nil {
w.WriteHeader(http.StatusBadRequest)
fmt.Fprintf(w, "Error with field 'updated': %s\n", err)
return
}
configUpdate, err := update.Compute(originalConfig, updatedConfig)
if err != nil {
w.WriteHeader(http.StatusBadRequest)
fmt.Fprintf(w, "Error computing update: %s\n", err)
return
}
configUpdate.ChannelId = r.FormValue("channel")
encoded, err := proto.Marshal(configUpdate)
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
fmt.Fprintf(w, "Error marshaling config update: %s\n", err)
return
}
w.WriteHeader(http.StatusOK)
w.Header().Set("Content-Type", "application/octet-stream")
w.Write(encoded)
}