github.com/uber/kraken@v0.1.4/tracker/trackerserver/metainfo.go (about)

     1  // Copyright (c) 2016-2019 Uber Technologies, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  package trackerserver
    15  
    16  import (
    17  	"fmt"
    18  	"net/http"
    19  
    20  	"github.com/uber/kraken/utils/handler"
    21  	"github.com/uber/kraken/utils/httputil"
    22  )
    23  
    24  func (s *Server) getMetaInfoHandler(w http.ResponseWriter, r *http.Request) error {
    25  	namespace, err := httputil.ParseParam(r, "namespace")
    26  	if err != nil {
    27  		return err
    28  	}
    29  	d, err := httputil.ParseDigest(r, "digest")
    30  	if err != nil {
    31  		return handler.Errorf("parse digest: %s", err).Status(http.StatusBadRequest)
    32  	}
    33  
    34  	timer := s.stats.Timer("get_metainfo").Start()
    35  	mi, err := s.originCluster.GetMetaInfo(namespace, d)
    36  	if err != nil {
    37  		if serr, ok := err.(httputil.StatusError); ok {
    38  			// Propagate errors received from origin.
    39  			return handler.Errorf("origin: %s", serr.ResponseDump).Status(serr.Status)
    40  		}
    41  		return err
    42  	}
    43  	timer.Stop()
    44  
    45  	b, err := mi.Serialize()
    46  	if err != nil {
    47  		return fmt.Errorf("serialize metainfo: %s", err)
    48  	}
    49  	w.Header().Set("Content-Type", "application/json")
    50  	w.Write(b)
    51  	return nil
    52  }