/
find.go
165 lines (142 loc) · 4.91 KB
/
find.go
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// Copyright (c) 2019 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 graphite
import (
"context"
"errors"
"net/http"
"sync"
"github.com/m3db/m3/src/query/api/v1/handler"
"github.com/m3db/m3/src/query/graphite/graphite"
"github.com/m3db/m3/src/query/storage"
"github.com/m3db/m3/src/query/util/logging"
xerrors "github.com/m3db/m3/src/x/errors"
"github.com/m3db/m3/src/x/net/http"
"go.uber.org/zap"
)
const (
// FindURL is the url for finding graphite metrics.
FindURL = handler.RoutePrefixV1 + "/graphite/metrics/find"
)
var (
// FindHTTPMethods is the HTTP methods used with this resource.
FindHTTPMethods = []string{http.MethodGet, http.MethodPost}
)
type grahiteFindHandler struct {
storage storage.Storage
fetchOptionsBuilder handler.FetchOptionsBuilder
}
// NewFindHandler returns a new instance of handler.
func NewFindHandler(
storage storage.Storage,
fetchOptionsBuilder handler.FetchOptionsBuilder,
) http.Handler {
return &grahiteFindHandler{
storage: storage,
fetchOptionsBuilder: fetchOptionsBuilder,
}
}
func mergeTags(
terminatedResult *storage.CompleteTagsResult,
childResult *storage.CompleteTagsResult,
) (map[string]bool, error) {
// sanity check the case.
if terminatedResult.CompleteNameOnly {
return nil, errors.New("terminated result is completing name only")
}
if childResult.CompleteNameOnly {
return nil, errors.New("child result is completing name only")
}
mapLength := len(terminatedResult.CompletedTags) + len(childResult.CompletedTags)
tagMap := make(map[string]bool, mapLength)
for _, tag := range terminatedResult.CompletedTags {
for _, value := range tag.Values {
tagMap[string(value)] = false
}
}
// NB: fine to overwrite any tags which were present in the `terminatedResult` map
// since if they appear in `childResult`, then they exist AND have children.
for _, tag := range childResult.CompletedTags {
for _, value := range tag.Values {
tagMap[string(value)] = true
}
}
return tagMap, nil
}
func (h *grahiteFindHandler) ServeHTTP(
w http.ResponseWriter,
r *http.Request,
) {
ctx := context.WithValue(r.Context(), handler.HeaderKey, r.Header)
logger := logging.WithContext(ctx)
w.Header().Set("Content-Type", "application/json")
// NB: need to run two separate queries, one of which will match only the
// provided matchers, and one which will match the provided matchers with at
// least one more child node. For further information, refer to the comment
// for parseFindParamsToQueries
terminatedQuery, childQuery, raw, rErr := parseFindParamsToQueries(r)
if rErr != nil {
xhttp.Error(w, rErr.Inner(), rErr.Code())
return
}
opts, rErr := h.fetchOptionsBuilder.NewFetchOptions(r)
if rErr != nil {
xhttp.Error(w, rErr.Inner(), rErr.Code())
return
}
var (
terminatedResult *storage.CompleteTagsResult
tErr error
childResult *storage.CompleteTagsResult
cErr error
wg sync.WaitGroup
)
wg.Add(2)
go func() {
terminatedResult, tErr = h.storage.CompleteTags(ctx, terminatedQuery, opts)
wg.Done()
}()
go func() {
childResult, cErr = h.storage.CompleteTags(ctx, childQuery, opts)
wg.Done()
}()
wg.Wait()
if err := xerrors.FirstError(tErr, cErr); err != nil {
logger.Error("unable to complete tags", zap.Error(err))
xhttp.Error(w, err, http.StatusBadRequest)
return
}
// NB: merge results from both queries to specify which series have children
seenMap, err := mergeTags(terminatedResult, childResult)
if err != nil {
logger.Error("unable to complete tags", zap.Error(err))
xhttp.Error(w, err, http.StatusBadRequest)
return
}
prefix := graphite.DropLastMetricPart(raw)
if len(prefix) > 0 {
prefix += "."
}
// TODO: Support multiple result types
if err = findResultsJSON(w, prefix, seenMap); err != nil {
logger.Error("unable to print find results", zap.Error(err))
xhttp.Error(w, err, http.StatusBadRequest)
}
}