251 lines
9.1 KiB
Plaintext
251 lines
9.1 KiB
Plaintext
// Copyright 2013 Prometheus Team
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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%{
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package rules
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import (
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clientmodel "github.com/prometheus/client_golang/model"
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"github.com/prometheus/prometheus/rules/ast"
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"github.com/prometheus/prometheus/storage/metric"
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)
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%}
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%union {
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num clientmodel.SampleValue
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str string
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ruleNode ast.Node
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ruleNodeSlice []ast.Node
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boolean bool
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labelNameSlice clientmodel.LabelNames
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labelSet clientmodel.LabelSet
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labelMatcher *metric.LabelMatcher
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labelMatchers metric.LabelMatchers
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}
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/* We simulate multiple start symbols for closely-related grammars via dummy tokens. See
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http://www.gnu.org/software/bison/manual/html_node/Multiple-start_002dsymbols.html
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Reason: we want to be able to parse lists of named rules as well as single expressions.
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*/
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%token START_RULES START_EXPRESSION
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%token <str> IDENTIFIER STRING DURATION METRICNAME
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%token <num> NUMBER
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%token PERMANENT GROUP_OP KEEPING_EXTRA
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%token <str> AGGR_OP CMP_OP ADDITIVE_OP MULT_OP
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%token ALERT IF FOR WITH SUMMARY DESCRIPTION
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%type <ruleNodeSlice> func_arg_list
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%type <labelNameSlice> label_list grouping_opts
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%type <labelSet> label_assign label_assign_list rule_labels
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%type <labelMatcher> label_match
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%type <labelMatchers> label_match_list label_matches
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%type <ruleNode> rule_expr func_arg
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%type <boolean> qualifier extra_labels_opts
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%type <str> for_duration metric_name label_match_type
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%right '='
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%left CMP_OP
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%left ADDITIVE_OP
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%left MULT_OP
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%start start
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%%
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start : START_RULES rules_stat_list
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| START_EXPRESSION saved_rule_expr
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;
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rules_stat_list : /* empty */
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| rules_stat_list rules_stat
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;
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saved_rule_expr : rule_expr
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{ yylex.(*RulesLexer).parsedExpr = $1 }
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;
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rules_stat : qualifier metric_name rule_labels '=' rule_expr
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{
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rule, err := CreateRecordingRule($2, $3, $5, $1)
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if err != nil { yylex.Error(err.Error()); return 1 }
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yylex.(*RulesLexer).parsedRules = append(yylex.(*RulesLexer).parsedRules, rule)
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}
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| ALERT IDENTIFIER IF rule_expr for_duration WITH rule_labels SUMMARY STRING DESCRIPTION STRING
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{
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rule, err := CreateAlertingRule($2, $4, $5, $7, $9, $11)
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if err != nil { yylex.Error(err.Error()); return 1 }
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yylex.(*RulesLexer).parsedRules = append(yylex.(*RulesLexer).parsedRules, rule)
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}
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;
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for_duration : /* empty */
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{ $$ = "0s" }
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| FOR DURATION
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{ $$ = $2 }
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;
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qualifier : /* empty */
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{ $$ = false }
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| PERMANENT
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{ $$ = true }
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;
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metric_name : METRICNAME
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{ $$ = $1 }
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| IDENTIFIER
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{ $$ = $1 }
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;
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rule_labels : /* empty */
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{ $$ = clientmodel.LabelSet{} }
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| '{' label_assign_list '}'
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{ $$ = $2 }
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| '{' '}'
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{ $$ = clientmodel.LabelSet{} }
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label_assign_list : label_assign
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{ $$ = $1 }
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| label_assign_list ',' label_assign
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{ for k, v := range $3 { $$[k] = v } }
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;
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label_assign : IDENTIFIER '=' STRING
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{ $$ = clientmodel.LabelSet{ clientmodel.LabelName($1): clientmodel.LabelValue($3) } }
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;
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label_matches : /* empty */
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{ $$ = metric.LabelMatchers{} }
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| '{' '}'
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{ $$ = metric.LabelMatchers{} }
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| '{' label_match_list '}'
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{ $$ = $2 }
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;
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label_match_list : label_match
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{ $$ = metric.LabelMatchers{$1} }
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| label_match_list ',' label_match
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{ $$ = append($$, $3) }
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;
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label_match : IDENTIFIER label_match_type STRING
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{
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var err error
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$$, err = newLabelMatcher($2, clientmodel.LabelName($1), clientmodel.LabelValue($3))
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if err != nil { yylex.Error(err.Error()); return 1 }
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}
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;
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label_match_type : '='
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{ $$ = "=" }
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| CMP_OP
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{ $$ = $1 }
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;
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rule_expr : '(' rule_expr ')'
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{ $$ = $2 }
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| '{' label_match_list '}'
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{ $$ = ast.NewVectorSelector($2) }
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| metric_name label_matches
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{
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var err error
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m, err := metric.NewLabelMatcher(metric.Equal, clientmodel.MetricNameLabel, clientmodel.LabelValue($1))
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if err != nil { yylex.Error(err.Error()); return 1 }
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$2 = append($2, m)
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$$ = ast.NewVectorSelector($2)
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}
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| IDENTIFIER '(' func_arg_list ')'
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{
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var err error
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$$, err = NewFunctionCall($1, $3)
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if err != nil { yylex.Error(err.Error()); return 1 }
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}
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| IDENTIFIER '(' ')'
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{
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var err error
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$$, err = NewFunctionCall($1, []ast.Node{})
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if err != nil { yylex.Error(err.Error()); return 1 }
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}
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| rule_expr '[' DURATION ']'
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{
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var err error
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$$, err = NewMatrixSelector($1, $3)
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if err != nil { yylex.Error(err.Error()); return 1 }
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}
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| AGGR_OP '(' rule_expr ')' grouping_opts extra_labels_opts
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{
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var err error
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$$, err = NewVectorAggregation($1, $3, $5, $6)
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if err != nil { yylex.Error(err.Error()); return 1 }
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}
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| AGGR_OP grouping_opts extra_labels_opts '(' rule_expr ')'
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{
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var err error
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$$, err = NewVectorAggregation($1, $5, $2, $3)
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if err != nil { yylex.Error(err.Error()); return 1 }
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}
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/* Yacc can only attach associativity to terminals, so we
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* have to list all operators here. */
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| rule_expr ADDITIVE_OP rule_expr
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{
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var err error
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$$, err = NewArithExpr($2, $1, $3)
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if err != nil { yylex.Error(err.Error()); return 1 }
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}
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| rule_expr MULT_OP rule_expr
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{
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var err error
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$$, err = NewArithExpr($2, $1, $3)
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if err != nil { yylex.Error(err.Error()); return 1 }
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}
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| rule_expr CMP_OP rule_expr
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{
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var err error
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$$, err = NewArithExpr($2, $1, $3)
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if err != nil { yylex.Error(err.Error()); return 1 }
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}
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| NUMBER
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{ $$ = ast.NewScalarLiteral($1)}
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;
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extra_labels_opts :
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{ $$ = false }
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| KEEPING_EXTRA
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{ $$ = true }
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;
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grouping_opts :
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{ $$ = clientmodel.LabelNames{} }
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| GROUP_OP '(' label_list ')'
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{ $$ = $3 }
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;
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label_list : IDENTIFIER
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{ $$ = clientmodel.LabelNames{clientmodel.LabelName($1)} }
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| label_list ',' IDENTIFIER
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{ $$ = append($$, clientmodel.LabelName($3)) }
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;
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func_arg_list : func_arg
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{ $$ = []ast.Node{$1} }
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| func_arg_list ',' func_arg
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{ $$ = append($$, $3) }
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;
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func_arg : rule_expr
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{ $$ = $1 }
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| STRING
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{ $$ = ast.NewStringLiteral($1) }
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;
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%%
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