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find.go
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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 (
"errors"
"net/http"
"sync"
"github.com/m3db/m3/src/query/api/v1/handler/prometheus/handleroptions"
"github.com/m3db/m3/src/query/api/v1/options"
"github.com/m3db/m3/src/query/api/v1/route"
"github.com/m3db/m3/src/query/graphite/graphite"
graphitestorage "github.com/m3db/m3/src/query/graphite/storage"
"github.com/m3db/m3/src/query/storage/m3/consolidators"
"github.com/m3db/m3/src/query/util/logging"
xerrors "github.com/m3db/m3/src/x/errors"
"github.com/m3db/m3/src/x/instrument"
xhttp "github.com/m3db/m3/src/x/net/http"
"go.uber.org/zap"
)
const (
// FindURL is the url for finding graphite metrics.
FindURL = route.Prefix + "/graphite/metrics/find"
)
// FindHTTPMethods are the HTTP methods for this handler.
var FindHTTPMethods = []string{http.MethodGet, http.MethodPost}
type grahiteFindHandler struct {
storage graphitestorage.Storage
graphiteStorageOpts graphitestorage.M3WrappedStorageOptions
fetchOptionsBuilder handleroptions.FetchOptionsBuilder
instrumentOpts instrument.Options
}
// NewFindHandler returns a new instance of handler.
func NewFindHandler(opts options.HandlerOptions) http.Handler {
wrappedStore := graphitestorage.NewM3WrappedStorage(opts.Storage(),
opts.M3DBOptions(), opts.InstrumentOpts(), opts.GraphiteStorageOptions())
return &grahiteFindHandler{
storage: wrappedStore,
graphiteStorageOpts: opts.GraphiteStorageOptions(),
fetchOptionsBuilder: opts.GraphiteFindFetchOptionsBuilder(),
instrumentOpts: opts.InstrumentOpts(),
}
}
type nodeDescriptor struct {
isLeaf bool
hasChildren bool
}
func mergeTags(
terminatedResult *consolidators.CompleteTagsResult,
childResult *consolidators.CompleteTagsResult,
) (map[string]nodeDescriptor, error) {
var (
terminatedResultTags = 0
childResultTags = 0
)
// Sanity check the queries aren't complete name only queries.
if terminatedResult != nil {
terminatedResultTags = len(terminatedResult.CompletedTags)
if terminatedResult.CompleteNameOnly {
return nil, errors.New("terminated result is completing name only")
}
}
if childResult != nil {
childResultTags = len(childResult.CompletedTags)
if childResult.CompleteNameOnly {
return nil, errors.New("child result is completing name only")
}
}
size := terminatedResultTags + childResultTags
tagMap := make(map[string]nodeDescriptor, size)
if terminatedResult != nil {
for _, tag := range terminatedResult.CompletedTags {
for _, value := range tag.Values {
descriptor := tagMap[string(value)]
descriptor.isLeaf = true
tagMap[string(value)] = descriptor
}
}
}
if childResult != nil {
for _, tag := range childResult.CompletedTags {
for _, value := range tag.Values {
descriptor := tagMap[string(value)]
descriptor.hasChildren = true
tagMap[string(value)] = descriptor
}
}
}
return tagMap, nil
}
func (h *grahiteFindHandler) ServeHTTP(
w http.ResponseWriter,
r *http.Request,
) {
ctx, opts, err := h.fetchOptionsBuilder.NewFetchOptions(r.Context(), r)
if err != nil {
xhttp.WriteError(w, err)
return
}
logger := logging.WithContext(ctx, h.instrumentOpts)
w.Header().Set(xhttp.HeaderContentType, xhttp.ContentTypeJSON)
// 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, err := parseFindParamsToQueries(r)
if err != nil {
xhttp.WriteError(w, err)
return
}
var (
terminatedResult *consolidators.CompleteTagsResult
tErr error
childResult *consolidators.CompleteTagsResult
cErr error
wg sync.WaitGroup
)
if terminatedQuery != nil {
// Sometimes we only perform the child query, so only perform
// terminated query if not nil.
wg.Add(1)
go func() {
terminatedResult, tErr = h.storage.CompleteTags(ctx, terminatedQuery, opts)
wg.Done()
}()
}
// Always perform child query.
wg.Add(1)
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 find search", zap.Error(err))
xhttp.WriteError(w, err)
return
}
meta := childResult.Metadata
if terminatedResult != nil {
meta = terminatedResult.Metadata.CombineMetadata(childResult.Metadata)
}
// NB: merge results from both queries to specify which series have children
seenMap, err := mergeTags(terminatedResult, childResult)
if err != nil {
logger.Error("unable to find merge", zap.Error(err))
xhttp.WriteError(w, err)
return
}
prefix := graphite.DropLastMetricPart(raw)
if len(prefix) > 0 {
prefix += "."
}
err = handleroptions.AddDBResultResponseHeaders(w, meta, opts)
if err != nil {
logger.Error("unable to render find header", zap.Error(err))
xhttp.WriteError(w, err)
return
}
// TODO: Support multiple result types
resultOpts := findResultsOptions{
includeBothExpandableAndLeaf: h.graphiteStorageOpts.FindResultsIncludeBothExpandableAndLeaf,
}
if err := findResultsJSON(w, prefix, seenMap, resultOpts); err != nil {
logger.Error("unable to render find results", zap.Error(err))
}
}