/
find_parser.go
177 lines (153 loc) · 5.18 KB
/
find_parser.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 (
"fmt"
"io"
"net/http"
"time"
"github.com/m3db/m3/src/query/errors"
"github.com/m3db/m3/src/query/graphite/graphite"
graphiteStorage "github.com/m3db/m3/src/query/graphite/storage"
"github.com/m3db/m3/src/query/models"
"github.com/m3db/m3/src/query/storage"
"github.com/m3db/m3/src/query/util/json"
"github.com/m3db/m3/src/x/net/http"
)
// parseFindParamsToQueries parses an incoming request to two find queries,
// which are then combined to give the final result.
// It returns, in order:
// the given query; this will return all values for exactly that tag which have
// _terminatedQuery, which adds an explicit terminator after the last term in
// no child nodes
// _childQuery, which adds an explicit match all after the last term in the
// given query; this will return all values for exactly that tag which have at
// least one child node.
// _rawQueryString, which is the initial query request (bar final
// matcher), which is used to reconstruct the return values.
// _err, any error encountered during parsing.
//
// As an example, given the query `a.b*`, and metrics `a.bar.c` and `a.biz`,
// terminatedQuery will return only [biz], and childQuery will return only
// [bar].
func parseFindParamsToQueries(r *http.Request) (
_terminatedQuery *storage.CompleteTagsQuery,
_childQuery *storage.CompleteTagsQuery,
_rawQueryString string,
_err *xhttp.ParseError,
) {
values := r.URL.Query()
query := values.Get("query")
if query == "" {
return nil, nil, "",
xhttp.NewParseError(errors.ErrNoQueryFound, http.StatusBadRequest)
}
now := time.Now()
fromString, untilString := r.FormValue("from"), r.FormValue("until")
if len(fromString) == 0 {
fromString = "0"
}
if len(untilString) == 0 {
untilString = "now"
}
from, err := graphite.ParseTime(
fromString,
now,
tzOffsetForAbsoluteTime,
)
if err != nil {
return nil, nil, "",
xhttp.NewParseError(fmt.Errorf("invalid 'from': %s", fromString),
http.StatusBadRequest)
}
until, err := graphite.ParseTime(
untilString,
now,
tzOffsetForAbsoluteTime,
)
if err != nil {
return nil, nil, "",
xhttp.NewParseError(fmt.Errorf("invalid 'until': %s", untilString),
http.StatusBadRequest)
}
matchers, err := graphiteStorage.TranslateQueryToMatchersWithTerminator(query)
if err != nil {
return nil, nil, "",
xhttp.NewParseError(fmt.Errorf("invalid 'query': %s", query),
http.StatusBadRequest)
}
// NB: Filter will always be the second last term in the matchers, and the
// matchers should always have a length of at least 2 (term + terminator)
// so this is a sanity check and unexpected in actual execution.
if len(matchers) < 2 {
return nil, nil, "", xhttp.NewParseError(fmt.Errorf("unable to parse "+
"'query': %s", query),
http.StatusBadRequest)
}
filter := [][]byte{matchers[len(matchers)-2].Name}
terminatedQuery := &storage.CompleteTagsQuery{
CompleteNameOnly: false,
FilterNameTags: filter,
TagMatchers: matchers,
Start: from,
End: until,
}
clonedMatchers := make([]models.Matcher, len(matchers))
copy(clonedMatchers, matchers)
// NB: change terminator from `MatchNotField` to `MatchField` to ensure
// segments with children are matched.
clonedMatchers[len(clonedMatchers)-1].Type = models.MatchField
childQuery := &storage.CompleteTagsQuery{
CompleteNameOnly: false,
FilterNameTags: filter,
TagMatchers: clonedMatchers,
Start: from,
End: until,
}
return terminatedQuery, childQuery, query, nil
}
func findResultsJSON(
w io.Writer,
prefix string,
tags map[string]bool,
) error {
jw := json.NewWriter(w)
jw.BeginArray()
for value, hasChildren := range tags {
leaf := 1
if hasChildren {
leaf = 0
}
jw.BeginObject()
jw.BeginObjectField("id")
jw.WriteString(fmt.Sprintf("%s%s", prefix, value))
jw.BeginObjectField("text")
jw.WriteString(value)
jw.BeginObjectField("leaf")
jw.WriteInt(leaf)
jw.BeginObjectField("expandable")
jw.WriteInt(1 - leaf)
jw.BeginObjectField("allowChildren")
jw.WriteInt(1 - leaf)
jw.EndObject()
}
jw.EndArray()
return jw.Close()
}