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constructor.go
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constructor.go
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// Copyright (c) 2017 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 (
"bytes"
"encoding/json"
"sort"
"strings"
"github.com/jeffail/benthos/lib/types"
"github.com/jeffail/benthos/lib/util/service/log"
"github.com/jeffail/benthos/lib/util/service/metrics"
)
//------------------------------------------------------------------------------
// typeSpec Constructor and a usage description for each processor type.
type typeSpec struct {
constructor func(conf Config, log log.Modular, stats metrics.Type) (Type, error)
description string
}
var constructors = map[string]typeSpec{}
//------------------------------------------------------------------------------
// Config is the all encompassing configuration struct for all processor types.
type Config struct {
Type string `json:"type" yaml:"type"`
BoundsCheck BoundsCheckConfig `json:"bounds_check" yaml:"bounds_check"`
SelectParts SelectPartsConfig `json:"select_parts" yaml:"select_parts"`
BlobToMulti struct{} `json:"blob_to_multi" yaml:"blob_to_multi"`
MultiToBlob struct{} `json:"multi_to_blob" yaml:"multi_to_blob"`
Sample SampleConfig `json:"sample" yaml:"sample"`
Combine CombineConfig `json:"combine" yaml:"combine"`
}
// NewConfig returns a configuration struct fully populated with default values.
func NewConfig() Config {
return Config{
Type: "bounds_check",
BoundsCheck: NewBoundsCheckConfig(),
SelectParts: NewSelectPartsConfig(),
BlobToMulti: struct{}{},
MultiToBlob: struct{}{},
Sample: NewSampleConfig(),
Combine: NewCombineConfig(),
}
}
// UnmarshalJSON ensures that when parsing configs that are in a slice the
// default values are still applied.
func (m *Config) UnmarshalJSON(bytes []byte) error {
type confAlias Config
aliased := confAlias(NewConfig())
if err := json.Unmarshal(bytes, &aliased); err != nil {
return err
}
*m = Config(aliased)
return nil
}
// UnmarshalYAML ensures that when parsing configs that are in a slice the
// default values are still applied.
func (m *Config) UnmarshalYAML(unmarshal func(interface{}) error) error {
type confAlias Config
aliased := confAlias(NewConfig())
if err := unmarshal(&aliased); err != nil {
return err
}
*m = Config(aliased)
return nil
}
//------------------------------------------------------------------------------
// Descriptions returns a formatted string of collated descriptions of each
// type.
func Descriptions() string {
// Order our buffer types alphabetically
names := []string{}
for name := range constructors {
names = append(names, name)
}
sort.Strings(names)
buf := bytes.Buffer{}
buf.WriteString("PROCESSORS\n")
buf.WriteString(strings.Repeat("=", 10))
buf.WriteString("\n\n")
buf.WriteString("This document has been generated with `benthos --list-processors`.")
buf.WriteString("\n\n")
// Append each description
for i, name := range names {
buf.WriteString("## ")
buf.WriteString("`" + name + "`")
buf.WriteString("\n")
buf.WriteString(constructors[name].description)
if i != (len(names) - 1) {
buf.WriteString("\n\n")
}
}
return buf.String()
}
// New creates a processor type based on a processor configuration.
func New(conf Config, log log.Modular, stats metrics.Type) (Type, error) {
if c, ok := constructors[conf.Type]; ok {
return c.constructor(conf, log, stats)
}
return nil, types.ErrInvalidProcessorType
}
//------------------------------------------------------------------------------