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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 placement
import (
"errors"
"net/http"
"path"
"strconv"
"time"
"github.com/m3db/m3/src/cluster/kv"
"github.com/m3db/m3/src/cluster/placement"
"github.com/m3db/m3/src/query/api/v1/handler"
"github.com/m3db/m3/src/query/generated/proto/admin"
"github.com/m3db/m3/src/query/util/logging"
xhttp "github.com/m3db/m3/src/x/net/http"
"go.uber.org/zap"
)
const (
// GetHTTPMethod is the HTTP method used with this resource.
GetHTTPMethod = http.MethodGet
)
var (
// DeprecatedM3DBGetURL is the old url for the placement get handler, maintained for
// backwards compatibility.
DeprecatedM3DBGetURL = path.Join(handler.RoutePrefixV1, PlacementPathName)
// M3DBGetURL is the url for the placement get handler (with the GET method)
// for the M3DB service.
M3DBGetURL = path.Join(handler.RoutePrefixV1, M3DBServicePlacementPathName)
// M3AggGetURL is the url for the placement get handler (with the GET method)
// for the M3Agg service.
M3AggGetURL = path.Join(handler.RoutePrefixV1, M3AggServicePlacementPathName)
// M3CoordinatorGetURL is the url for the placement get handler (with the GET method)
// for the M3Coordinator service.
M3CoordinatorGetURL = path.Join(handler.RoutePrefixV1, M3CoordinatorServicePlacementPathName)
errPlacementDoesNotExist = errors.New("placement does not exist")
)
// GetHandler is the handler for placement gets.
type GetHandler Handler
// NewGetHandler returns a new instance of GetHandler.
func NewGetHandler(opts HandlerOptions) *GetHandler {
return &GetHandler{HandlerOptions: opts, nowFn: time.Now}
}
func (h *GetHandler) ServeHTTP(serviceName string, w http.ResponseWriter, r *http.Request) {
var (
ctx = r.Context()
logger = logging.WithContext(ctx)
)
placement, badRequest, err := h.Get(serviceName, r)
if err != nil && badRequest {
xhttp.Error(w, err, http.StatusBadRequest)
return
}
if err != nil {
xhttp.Error(w, err, http.StatusNotFound)
return
}
if placement == nil {
xhttp.Error(w, errPlacementDoesNotExist, http.StatusNotFound)
return
}
placementProto, err := placement.Proto()
if err != nil {
logger.Error("unable to get placement protobuf", zap.Error(err))
xhttp.Error(w, err, http.StatusInternalServerError)
return
}
resp := &admin.PlacementGetResponse{
Placement: placementProto,
Version: int32(placement.Version()),
}
xhttp.WriteProtoMsgJSONResponse(w, resp, logger)
}
// Get gets a placement.
func (h *GetHandler) Get(
serviceName string,
httpReq *http.Request,
) (placement placement.Placement, badRequest bool, err error) {
var headers http.Header
if httpReq != nil {
headers = httpReq.Header
}
opts := handler.NewServiceOptions(
serviceName, headers, h.M3AggServiceOptions)
service, err := Service(h.ClusterClient, opts, h.nowFn(), nil)
if err != nil {
return nil, false, err
}
var (
version int
vs string
)
if httpReq != nil {
vs = httpReq.FormValue("version")
}
if vs != "" {
version, err = strconv.Atoi(vs)
if err == nil {
placement, err = service.PlacementForVersion(version)
} else {
badRequest = true
}
} else {
placement, err = service.Placement()
}
if err == kv.ErrNotFound {
// TODO(rartoul): This should probably be handled at the service
// level but that would be a large refactor.
return nil, false, nil
}
if err != nil {
return nil, badRequest, err
}
return placement, badRequest, nil
}