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options.go
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options.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 promql
import (
"github.com/m3db/m3/src/query/models"
"github.com/m3db/m3/src/query/parser"
"github.com/prometheus/prometheus/pkg/labels"
pql "github.com/prometheus/prometheus/promql/parser"
)
// ParseFunctionExpr parses arguments to a function expression, returning
// a function, a bool indicating whether the function is a noop,
// and any errors during execution.
type ParseFunctionExpr func(
name string,
argValues []interface{},
stringValues []string,
hasArgValue bool,
inner string,
tagOptions models.TagOptions,
) (parser.Params, bool, error)
// ParseFn is a function that parses a query to a Prometheus expression.
type ParseFn func(query string) (pql.Expr, error)
func defaultParseFn(query string) (pql.Expr, error) {
return pql.ParseExpr(query)
}
// MetricSelectorFn is a function that parses a query to Prometheus selectors.
type MetricSelectorFn func(query string) ([]*labels.Matcher, error)
func defaultMetricSelectorFn(query string) ([]*labels.Matcher, error) {
return pql.ParseMetricSelector(query)
}
// ParseOptions are options for the Prometheus parser.
type ParseOptions interface {
// ParseFn gets the parse function.
ParseFn() ParseFn
// SetParseFn sets the parse function.
SetParseFn(f ParseFn) ParseOptions
// MetricSelectorFn gets the metric selector function.
MetricSelectorFn() MetricSelectorFn
// SetMetricSelectorFn sets the metric selector function.
SetMetricSelectorFn(f MetricSelectorFn) ParseOptions
// FunctionParseExpr gets the parsing function.
FunctionParseExpr() ParseFunctionExpr
// SetFunctionParseExpr sets the parsing function.
SetFunctionParseExpr(f ParseFunctionExpr) ParseOptions
}
type parseOptions struct {
parseFn ParseFn
selectorFn MetricSelectorFn
fnParseExpr ParseFunctionExpr
}
// NewParseOptions creates a new parse options.
func NewParseOptions() ParseOptions {
return &parseOptions{
parseFn: defaultParseFn,
selectorFn: defaultMetricSelectorFn,
fnParseExpr: NewFunctionExpr,
}
}
func (o *parseOptions) ParseFn() ParseFn {
return o.parseFn
}
func (o *parseOptions) SetParseFn(f ParseFn) ParseOptions {
opts := *o
opts.parseFn = f
return &opts
}
func (o *parseOptions) MetricSelectorFn() MetricSelectorFn {
return o.selectorFn
}
func (o *parseOptions) SetMetricSelectorFn(f MetricSelectorFn) ParseOptions {
opts := *o
opts.selectorFn = f
return &opts
}
func (o *parseOptions) FunctionParseExpr() ParseFunctionExpr {
return o.fnParseExpr
}
func (o *parseOptions) SetFunctionParseExpr(f ParseFunctionExpr) ParseOptions {
opts := *o
opts.fnParseExpr = f
return &opts
}