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condition.go
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condition.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 processor
import (
"fmt"
"github.com/Jeffail/benthos/lib/processor/condition"
"github.com/Jeffail/benthos/lib/types"
"github.com/Jeffail/benthos/lib/util/service/log"
"github.com/Jeffail/benthos/lib/util/service/metrics"
)
//------------------------------------------------------------------------------
func init() {
Constructors["condition"] = TypeSpec{
constructor: NewCondition,
description: `
Tests each message against a condition, if the condition fails then the message
is dropped. You can read a [full list of conditions here](../conditions).`,
}
}
//------------------------------------------------------------------------------
// ConditionConfig contains configuration fields for the Condition processor.
type ConditionConfig struct {
condition.Config `json:",inline" yaml:",inline"`
}
// NewConditionConfig returns a ConditionConfig with default values.
func NewConditionConfig() ConditionConfig {
return ConditionConfig{
Config: condition.NewConfig(),
}
}
//------------------------------------------------------------------------------
// Condition is a processor that checks each message against a set of bounds
// and rejects messages if they aren't within them.
type Condition struct {
log log.Modular
stats metrics.Type
condition condition.Type
}
// NewCondition returns a Condition processor.
func NewCondition(
conf Config, mgr types.Manager, log log.Modular, stats metrics.Type,
) (Type, error) {
cond, err := condition.New(conf.Condition.Config, mgr, log, stats)
if err != nil {
return nil, fmt.Errorf(
"failed to construct condition '%v': %v",
conf.Condition.Config.Type, err,
)
}
return &Condition{
log: log.NewModule(".processor.condition"),
stats: stats,
condition: cond,
}, nil
}
//------------------------------------------------------------------------------
// ProcessMessage checks each message against a set of bounds.
func (c *Condition) ProcessMessage(msg types.Message) ([]types.Message, types.Response) {
c.stats.Incr("processor.condition.count", 1)
if !c.condition.Check(msg) {
c.stats.Incr("processor.condition.dropped", 1)
return nil, types.NewSimpleResponse(nil)
}
c.stats.Incr("processor.condition.sent", 1)
msgs := [1]types.Message{msg}
return msgs[:], nil
}
//------------------------------------------------------------------------------