github.com/yacovm/fabric@v2.0.0-alpha.0.20191128145320-c5d4087dc723+incompatible/common/flogging/httpadmin/spec.go (about)

     1  /*
     2  Copyright IBM Corp. All Rights Reserved.
     3  
     4  SPDX-License-Identifier: Apache-2.0
     5  */
     6  
     7  package httpadmin
     8  
     9  import (
    10  	"encoding/json"
    11  	"fmt"
    12  	"net/http"
    13  
    14  	"github.com/hyperledger/fabric/common/flogging"
    15  )
    16  
    17  //go:generate counterfeiter -o fakes/logging.go -fake-name Logging . Logging
    18  
    19  type Logging interface {
    20  	ActivateSpec(spec string) error
    21  	Spec() string
    22  }
    23  
    24  type LogSpec struct {
    25  	Spec string `json:"spec,omitempty"`
    26  }
    27  
    28  type ErrorResponse struct {
    29  	Error string `json:"error"`
    30  }
    31  
    32  func NewSpecHandler() *SpecHandler {
    33  	return &SpecHandler{
    34  		Logging: flogging.Global,
    35  		Logger:  flogging.MustGetLogger("flogging.httpadmin"),
    36  	}
    37  }
    38  
    39  type SpecHandler struct {
    40  	Logging Logging
    41  	Logger  *flogging.FabricLogger
    42  }
    43  
    44  func (h *SpecHandler) ServeHTTP(resp http.ResponseWriter, req *http.Request) {
    45  	switch req.Method {
    46  	case http.MethodPut:
    47  		var logSpec LogSpec
    48  		decoder := json.NewDecoder(req.Body)
    49  		if err := decoder.Decode(&logSpec); err != nil {
    50  			h.sendResponse(resp, http.StatusBadRequest, err)
    51  			return
    52  		}
    53  		req.Body.Close()
    54  
    55  		if err := h.Logging.ActivateSpec(logSpec.Spec); err != nil {
    56  			h.sendResponse(resp, http.StatusBadRequest, err)
    57  			return
    58  		}
    59  		resp.WriteHeader(http.StatusNoContent)
    60  
    61  	case http.MethodGet:
    62  		h.sendResponse(resp, http.StatusOK, &LogSpec{Spec: h.Logging.Spec()})
    63  
    64  	default:
    65  		err := fmt.Errorf("invalid request method: %s", req.Method)
    66  		h.sendResponse(resp, http.StatusBadRequest, err)
    67  	}
    68  }
    69  
    70  func (h *SpecHandler) sendResponse(resp http.ResponseWriter, code int, payload interface{}) {
    71  	encoder := json.NewEncoder(resp)
    72  	if err, ok := payload.(error); ok {
    73  		payload = &ErrorResponse{Error: err.Error()}
    74  	}
    75  
    76  	resp.WriteHeader(code)
    77  
    78  	resp.Header().Set("Content-Type", "application/json")
    79  	if err := encoder.Encode(payload); err != nil {
    80  		h.Logger.Errorw("failed to encode payload", "error", err)
    81  	}
    82  }