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get.go
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get.go
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// Copyright (c) 2018 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package topic
import (
"net/http"
clusterclient "github.com/m3db/m3/src/cluster/client"
"github.com/m3db/m3/src/cmd/services/m3query/config"
"github.com/m3db/m3/src/msg/topic"
"github.com/m3db/m3/src/query/api/v1/handler"
"github.com/m3db/m3/src/query/api/v1/handler/prometheus/handleroptions"
"github.com/m3db/m3/src/query/generated/proto/admin"
"github.com/m3db/m3/src/query/util/logging"
"github.com/m3db/m3/src/x/instrument"
xhttp "github.com/m3db/m3/src/x/net/http"
"go.uber.org/zap"
)
const (
// GetURL is the url for the topic get handler (with the GET method).
GetURL = handler.RoutePrefixV1 + "/topic"
// GetHTTPMethod is the HTTP method used with this resource.
GetHTTPMethod = http.MethodGet
)
// GetHandler is the handler for topic gets.
type GetHandler Handler
// newGetHandler returns a new instance of GetHandler.
func newGetHandler(
client clusterclient.Client,
cfg config.Configuration,
instrumentOpts instrument.Options,
) http.Handler {
return &GetHandler{
client: client,
cfg: cfg,
serviceFn: Service,
instrumentOpts: instrumentOpts,
}
}
func (h *GetHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
var (
ctx = r.Context()
logger = logging.WithContext(ctx, h.instrumentOpts)
)
serviceCfg := handleroptions.ServiceNameAndDefaults{}
svcOpts := handleroptions.NewServiceOptions(serviceCfg, r.Header, nil)
service, err := h.serviceFn(h.client, svcOpts)
if err != nil {
logger.Error("unable to get service", zap.Error(err))
xhttp.Error(w, err, http.StatusInternalServerError)
return
}
t, err := service.Get(topicName(r.Header))
if err != nil {
logger.Error("unable to get topic", zap.Error(err))
xhttp.Error(w, err, http.StatusNotFound)
return
}
pb, err := topic.ToProto(t)
if err != nil {
logger.Error("unable to get topic protobuf", zap.Error(err))
xhttp.Error(w, err, http.StatusInternalServerError)
return
}
resp := &admin.TopicGetResponse{
Topic: pb,
Version: uint32(t.Version()),
}
xhttp.WriteProtoMsgJSONResponse(w, resp, logger)
}