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metadata.go
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metadata.go
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// Copyright (c) 2018 Ashley Jeffs
//
// 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 condition
import (
"errors"
"fmt"
"strconv"
"strings"
"github.com/Jeffail/benthos/lib/log"
"github.com/Jeffail/benthos/lib/metrics"
"github.com/Jeffail/benthos/lib/types"
)
//------------------------------------------------------------------------------
func init() {
Constructors[TypeMetadata] = TypeSpec{
constructor: NewMetadata,
description: `
Metadata is a condition that checks metadata keys of a message part against an
operator from the following list:
### ` + "`exists`" + `
Checks whether a metadata key exists.
### ` + "`equals`" + `
Checks whether the contents of a metadata key matches an argument. This operator
is case insensitive.
### ` + "`equals_cs`" + `
Checks whether the contents of a metadata key matches an argument. This operator
is case sensitive.
### ` + "`less_than`" + `
Checks whether the contents of a metadata key, parsed as a floating point
number, is less than an argument. Returns false if the metadata value cannot be
parsed into a number.
### ` + "`greater_than`" + `
Checks whether the contents of a metadata key, parsed as a floating point
number, is greater than an argument. Returns false if the metadata value cannot
be parsed into a number.`,
}
}
//------------------------------------------------------------------------------
// Errors for the metadata condition.
var (
ErrInvalidMetadataOperator = errors.New("invalid metadata operator type")
)
// MetadataConfig is a configuration struct containing fields for the metadata
// condition.
type MetadataConfig struct {
Operator string `json:"operator" yaml:"operator"`
Part int `json:"part" yaml:"part"`
Key string `json:"key" yaml:"key"`
Arg string `json:"arg" yaml:"arg"`
}
// NewMetadataConfig returns a MetadataConfig with default values.
func NewMetadataConfig() MetadataConfig {
return MetadataConfig{
Operator: "equals_cs",
Part: 0,
Key: "",
Arg: "",
}
}
//------------------------------------------------------------------------------
type metadataOperator func(md types.Metadata) bool
func metadataExistsOperator(key string) metadataOperator {
return func(md types.Metadata) bool {
return len(md.Get(key)) > 0
}
}
func metadataEqualsOperator(key string, arg string) metadataOperator {
return func(md types.Metadata) bool {
return strings.ToLower(md.Get(key)) == strings.ToLower(arg)
}
}
func metadataEqualsCSOperator(key string, arg string) metadataOperator {
return func(md types.Metadata) bool {
return md.Get(key) == arg
}
}
func metadataGreaterThanOperator(key string, argStr string) (metadataOperator, error) {
arg, err := strconv.ParseFloat(argStr, 10)
if err != nil {
return nil, fmt.Errorf("failed to parse argument as number: %v", err)
}
return func(md types.Metadata) bool {
val, verr := strconv.ParseFloat(md.Get(key), 10)
if verr != nil {
return false
}
return val > arg
}, nil
}
func metadataLessThanOperator(key string, argStr string) (metadataOperator, error) {
arg, err := strconv.ParseFloat(argStr, 10)
if err != nil {
return nil, fmt.Errorf("failed to parse argument as number: %v", err)
}
return func(md types.Metadata) bool {
val, verr := strconv.ParseFloat(md.Get(key), 10)
if verr != nil {
return false
}
return val < arg
}, nil
}
func strToMetadataOperator(str, key, arg string) (metadataOperator, error) {
switch str {
case "exists":
return metadataExistsOperator(key), nil
case "equals":
return metadataEqualsOperator(key, arg), nil
case "equals_cs":
return metadataEqualsCSOperator(key, arg), nil
case "greater_than":
return metadataGreaterThanOperator(key, arg)
case "less_than":
return metadataLessThanOperator(key, arg)
}
return nil, ErrInvalidMetadataOperator
}
//------------------------------------------------------------------------------
// Metadata is a condition that checks message text against logical operators.
type Metadata struct {
stats metrics.Type
operator metadataOperator
part int
mSkippedEmpty metrics.StatCounter
mSkipped metrics.StatCounter
mSkippedOOB metrics.StatCounter
mApplied metrics.StatCounter
}
// NewMetadata returns a Metadata condition.
func NewMetadata(
conf Config, mgr types.Manager, log log.Modular, stats metrics.Type,
) (Type, error) {
op, err := strToMetadataOperator(conf.Metadata.Operator, conf.Metadata.Key, conf.Metadata.Arg)
if err != nil {
return nil, fmt.Errorf("operator '%v': %v", conf.Metadata.Operator, err)
}
return &Metadata{
stats: stats,
operator: op,
part: conf.Metadata.Part,
mSkippedEmpty: stats.GetCounter("condition.text.skipped.empty_message"),
mSkipped: stats.GetCounter("condition.text.skipped"),
mSkippedOOB: stats.GetCounter("condition.text.skipped.out_of_bounds"),
mApplied: stats.GetCounter("condition.text.applied"),
}, nil
}
//------------------------------------------------------------------------------
// Check attempts to check a message part against a configured condition.
func (c *Metadata) Check(msg types.Message) bool {
index := c.part
lParts := msg.Len()
if lParts == 0 {
c.mSkippedEmpty.Incr(1)
c.mSkipped.Incr(1)
return false
}
c.mApplied.Incr(1)
return c.operator(msg.Get(index).Metadata())
}
//------------------------------------------------------------------------------