github.com/myafeier/fabric@v1.0.1-0.20170722181825-3a4b1f2bce86/common/tools/configtxlator/rest/configtxlator_handlers.go (about)

     1  /*
     2  Copyright IBM Corp. 2017 All Rights Reserved.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8                   http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package rest
    18  
    19  import (
    20  	"encoding/json"
    21  	"fmt"
    22  	"io/ioutil"
    23  	"net/http"
    24  
    25  	"github.com/hyperledger/fabric/common/tools/configtxlator/sanitycheck"
    26  	"github.com/hyperledger/fabric/common/tools/configtxlator/update"
    27  	cb "github.com/hyperledger/fabric/protos/common"
    28  
    29  	"github.com/golang/protobuf/proto"
    30  )
    31  
    32  func fieldBytes(fieldName string, r *http.Request) ([]byte, error) {
    33  	fieldFile, _, err := r.FormFile(fieldName)
    34  	if err != nil {
    35  		return nil, err
    36  	}
    37  	defer fieldFile.Close()
    38  
    39  	return ioutil.ReadAll(fieldFile)
    40  }
    41  
    42  func fieldConfigProto(fieldName string, r *http.Request) (*cb.Config, error) {
    43  	fieldBytes, err := fieldBytes(fieldName, r)
    44  	if err != nil {
    45  		return nil, fmt.Errorf("error reading field bytes: %s", err)
    46  	}
    47  
    48  	config := &cb.Config{}
    49  	err = proto.Unmarshal(fieldBytes, config)
    50  	if err != nil {
    51  		return nil, fmt.Errorf("error unmarshaling field bytes: %s", err)
    52  	}
    53  
    54  	return config, nil
    55  }
    56  
    57  func ComputeUpdateFromConfigs(w http.ResponseWriter, r *http.Request) {
    58  	originalConfig, err := fieldConfigProto("original", r)
    59  	if err != nil {
    60  		w.WriteHeader(http.StatusBadRequest)
    61  		fmt.Fprintf(w, "Error with field 'original': %s\n", err)
    62  		return
    63  	}
    64  
    65  	updatedConfig, err := fieldConfigProto("updated", r)
    66  	if err != nil {
    67  		w.WriteHeader(http.StatusBadRequest)
    68  		fmt.Fprintf(w, "Error with field 'updated': %s\n", err)
    69  		return
    70  	}
    71  
    72  	configUpdate, err := update.Compute(originalConfig, updatedConfig)
    73  	if err != nil {
    74  		w.WriteHeader(http.StatusBadRequest)
    75  		fmt.Fprintf(w, "Error computing update: %s\n", err)
    76  		return
    77  	}
    78  
    79  	configUpdate.ChannelId = r.FormValue("channel")
    80  
    81  	encoded, err := proto.Marshal(configUpdate)
    82  	if err != nil {
    83  		w.WriteHeader(http.StatusInternalServerError)
    84  		fmt.Fprintf(w, "Error marshaling config update: %s\n", err)
    85  		return
    86  	}
    87  
    88  	w.WriteHeader(http.StatusOK)
    89  	w.Header().Set("Content-Type", "application/octet-stream")
    90  	w.Write(encoded)
    91  }
    92  
    93  func SanityCheckConfig(w http.ResponseWriter, r *http.Request) {
    94  	buf, err := ioutil.ReadAll(r.Body)
    95  	if err != nil {
    96  		w.WriteHeader(http.StatusBadRequest)
    97  		fmt.Fprintln(w, err)
    98  		return
    99  	}
   100  
   101  	config := &cb.Config{}
   102  	err = proto.Unmarshal(buf, config)
   103  	if err != nil {
   104  		w.WriteHeader(http.StatusBadRequest)
   105  		fmt.Fprintf(w, "Error unmarshaling data to common.Config': %s\n", err)
   106  		return
   107  	}
   108  
   109  	fmt.Printf("Sanity checking %+v\n", config)
   110  	sanityCheckMessages, err := sanitycheck.Check(config)
   111  	if err != nil {
   112  		w.WriteHeader(http.StatusInternalServerError)
   113  		fmt.Fprintf(w, "Error performing sanity check: %s\n", err)
   114  		return
   115  	}
   116  
   117  	resBytes, err := json.Marshal(sanityCheckMessages)
   118  	if err != nil {
   119  		w.WriteHeader(http.StatusInternalServerError)
   120  		fmt.Fprintf(w, "Error marshaling result to JSON: %s\n", err)
   121  		return
   122  	}
   123  	w.WriteHeader(http.StatusOK)
   124  	w.Write(resBytes)
   125  }