github.com/m3db/m3@v1.5.0/src/x/debug/ext/namespace.go (about)

     1  // Copyright (c) 2019 Uber Technologies, Inc.
     2  //
     3  // Permission is hereby granted, free of charge, to any person obtaining a copy
     4  // of this software and associated documentation files (the "Software"), to deal
     5  // in the Software without restriction, including without limitation the rights
     6  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     7  // copies of the Software, and to permit persons to whom the Software is
     8  // furnished to do so, subject to the following conditions:
     9  //
    10  // The above copyright notice and this permission notice shall be included in
    11  // all copies or substantial portions of the Software.
    12  //
    13  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    14  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    15  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    16  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    17  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    18  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    19  // THE SOFTWARE.
    20  
    21  package extdebug
    22  
    23  import (
    24  	"bytes"
    25  	"encoding/json"
    26  	"fmt"
    27  	"io"
    28  	"net/http"
    29  
    30  	clusterclient "github.com/m3db/m3/src/cluster/client"
    31  	"github.com/m3db/m3/src/cluster/placementhandler/handleroptions"
    32  	"github.com/m3db/m3/src/query/api/v1/handler/namespace"
    33  	"github.com/m3db/m3/src/query/generated/proto/admin"
    34  	"github.com/m3db/m3/src/x/debug"
    35  	"github.com/m3db/m3/src/x/instrument"
    36  	xhttp "github.com/m3db/m3/src/x/net/http"
    37  
    38  	"github.com/gogo/protobuf/jsonpb"
    39  )
    40  
    41  type namespaceInfoSource struct {
    42  	handler  *namespace.GetHandler
    43  	defaults handleroptions.ServiceNameAndDefaults
    44  }
    45  
    46  // NewNamespaceInfoSource returns a Source for namespace information.
    47  func NewNamespaceInfoSource(
    48  	clusterClient clusterclient.Client,
    49  	allDefaults []handleroptions.ServiceNameAndDefaults,
    50  	instrumentOpts instrument.Options,
    51  ) (debug.Source, error) {
    52  	var (
    53  		m3dbDefault handleroptions.ServiceNameAndDefaults
    54  		found       bool
    55  	)
    56  	for _, def := range allDefaults {
    57  		if def.ServiceName == handleroptions.M3DBServiceName {
    58  			m3dbDefault = def
    59  			found = true
    60  			break
    61  		}
    62  	}
    63  
    64  	if !found {
    65  		return nil, fmt.Errorf("could not find M3DB service in defaults: %v", allDefaults)
    66  	}
    67  
    68  	handler := namespace.NewGetHandler(clusterClient,
    69  		instrumentOpts)
    70  
    71  	return &namespaceInfoSource{
    72  		handler:  handler,
    73  		defaults: m3dbDefault,
    74  	}, nil
    75  }
    76  
    77  // Write fetches data about the namespace and writes it in the given writer.
    78  // The data is formatted in json.
    79  func (n *namespaceInfoSource) Write(w io.Writer, r *http.Request) error {
    80  	opts := handleroptions.NewServiceOptions(n.defaults, r.Header, nil)
    81  	nsRegistry, err := n.handler.Get(opts)
    82  	if err != nil {
    83  		return err
    84  	}
    85  
    86  	resp := &admin.NamespaceGetResponse{
    87  		Registry: &nsRegistry,
    88  	}
    89  
    90  	marshaler := jsonpb.Marshaler{EmitDefaults: true}
    91  	buf := new(bytes.Buffer)
    92  	if err := marshaler.Marshal(buf, resp); err != nil {
    93  		return err
    94  	}
    95  
    96  	toDuration, err := xhttp.NanosToDurationBytes(buf)
    97  	if err != nil {
    98  		return err
    99  	}
   100  
   101  	jsonData, err := json.Marshal(toDuration)
   102  	if err != nil {
   103  		return err
   104  	}
   105  
   106  	_, err = w.Write(jsonData)
   107  	if err != nil {
   108  		return err
   109  	}
   110  
   111  	return nil
   112  }