condition

package
v3.0.0-rc2 Latest Latest
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 Go to latest Published: Sep 9, 2019 License: MIT Imports: 20 Imported by: 11

Documentation

Overview

Package condition contains logical operators that, based on their configuration, return boolean values from messages under certain circumstances.

Index

Constants

This section is empty.

Variables

View Source 
var (
	TypeAll                = "all"
	TypeAnd                = "and"
	TypeAny                = "any"
	TypeBoundsCheck        = "bounds_check"
	TypeCheckField         = "check_field"
	TypeCheckInterpolation = "check_interpolation"
	TypeCount              = "count"
	TypeJMESPath           = "jmespath"
	TypeNot                = "not"
	TypeNumber             = "number"
	TypeMetadata           = "metadata"
	TypeOr                 = "or"
	TypeProcessorFailed    = "processor_failed"
	TypeResource           = "resource"
	TypeStatic             = "static"
	TypeText               = "text"
	TypeXor                = "xor"
)

String constants representing each condition type.

View Source 
var Constructors = map[string]TypeSpec{}

Constructors is a map of all condition types with their specs.

View Source 
var (
	ErrInvalidMetadataOperator = errors.New("invalid metadata operator type")
)

Errors for the metadata condition.

View Source 
var (
	ErrInvalidNumberOperator = errors.New("invalid number operator type")
)

Errors for the number condition.

View Source 
var (
	ErrInvalidTextOperator = errors.New("invalid text operator type")
)

Errors for the text condition.

Functions

func Descriptions 

func Descriptions() string

Descriptions returns a formatted string of collated descriptions of each type.

func DocumentPlugin 

func DocumentPlugin(
	typeString, description string,
	configSanitiser PluginConfigSanitiser,
)

DocumentPlugin adds a description and an optional configuration sanitiser function to the definition of a registered plugin. This improves the documentation generated by PluginDescriptions.

func PluginCount 

func PluginCount() int

PluginCount returns the number of registered plugins. This does NOT count the standard set of components.

func PluginDescriptions 

func PluginDescriptions() string

PluginDescriptions generates and returns a markdown formatted document listing each registered plugin and an example configuration for it.

func RegisterPlugin 

func RegisterPlugin(
	typeString string,
	configConstructor PluginConfigConstructor,
	constructor PluginConstructor,
)

RegisterPlugin registers a plugin by a unique name so that it can be constructed similar to regular conditions. If configuration is not needed for this plugin then configConstructor can be nil. A constructor for the plugin itself must be provided.

func SanitiseConfig 

func SanitiseConfig(conf Config) (interface{}, error)

SanitiseConfig returns a sanitised version of the Config, meaning sections that aren't relevant to behaviour are removed.

Types

type All 

type All struct {
	// contains filtered or unexported fields
}

All is a condition that returns the logical or of all children.

func (*All) Check 

func (c *All) Check(msg types.Message) bool

Check attempts to check a message part against a configured condition.

type AllConfig 

type AllConfig struct {
	*Config `yaml:",inline" json:",inline"`
}

AllConfig is a configuration struct containing fields for the All condition.

func NewAllConfig 

func NewAllConfig() AllConfig

NewAllConfig returns a AllConfig with default values.

func (AllConfig) MarshalJSON 

func (m AllConfig) MarshalJSON() ([]byte, error)

MarshalJSON prints an empty object instead of nil.

func (AllConfig) MarshalYAML 

func (m AllConfig) MarshalYAML() (interface{}, error)

MarshalYAML prints an empty object instead of nil.

func (*AllConfig) UnmarshalJSON 

func (m *AllConfig) UnmarshalJSON(bytes []byte) error

UnmarshalJSON ensures that when parsing child config it is initialised.

func (*AllConfig) UnmarshalYAML 

func (m *AllConfig) UnmarshalYAML(unmarshal func(interface{}) error) error

UnmarshalYAML ensures that when parsing child config it is initialised.

type And 

type And struct {
	// contains filtered or unexported fields
}

And is a condition that returns the logical AND of all children.

func (*And) Check 

func (c *And) Check(msg types.Message) bool

Check attempts to check a message part against a configured condition.

type AndConfig 

type AndConfig []Config

AndConfig is a configuration struct containing fields for the And condition.

func NewAndConfig 

func NewAndConfig() AndConfig

NewAndConfig returns a AndConfig with default values.

type Any 

type Any struct {
	// contains filtered or unexported fields
}

Any is a condition that returns the logical or of all children.

func (*Any) Check 

func (c *Any) Check(msg types.Message) bool

Check attempts to check a message part against a configured condition.

type AnyConfig 

type AnyConfig struct {
	*Config `yaml:",inline" json:",inline"`
}

AnyConfig is a configuration struct containing fields for the Any condition.

func NewAnyConfig 

func NewAnyConfig() AnyConfig

NewAnyConfig returns a AnyConfig with default values.

func (AnyConfig) MarshalJSON 

func (m AnyConfig) MarshalJSON() ([]byte, error)

MarshalJSON prints an empty object instead of nil.

func (AnyConfig) MarshalYAML 

func (m AnyConfig) MarshalYAML() (interface{}, error)

MarshalYAML prints an empty object instead of nil.

func (*AnyConfig) UnmarshalJSON 

func (m *AnyConfig) UnmarshalJSON(bytes []byte) error

UnmarshalJSON ensures that when parsing child config it is initialised.

func (*AnyConfig) UnmarshalYAML 

func (m *AnyConfig) UnmarshalYAML(unmarshal func(interface{}) error) error

UnmarshalYAML ensures that when parsing child config it is initialised.

type BoundsCheck 

type BoundsCheck struct {
	// contains filtered or unexported fields
}

BoundsCheck is a condition that checks a message against a set of bounds.

func (*BoundsCheck) Check 

func (c *BoundsCheck) Check(msg types.Message) bool

Check attempts to check a message part against a configured condition

type BoundsCheckConfig 

type BoundsCheckConfig struct {
	MaxParts    int `json:"max_parts" yaml:"max_parts"`
	MinParts    int `json:"min_parts" yaml:"min_parts"`
	MaxPartSize int `json:"max_part_size" yaml:"max_part_size"`
	MinPartSize int `json:"min_part_size" yaml:"min_part_size"`
}

BoundsCheckConfig contains configuration fields for the BoundsCheck condition.

func NewBoundsCheckConfig 

func NewBoundsCheckConfig() BoundsCheckConfig

NewBoundsCheckConfig returns a BoundsCheckConfig with default values.

type CheckField 

type CheckField struct {
	// contains filtered or unexported fields
}

CheckField is a condition that extracts a field and checks the contents against a child condition.

func (*CheckField) Check 

func (c *CheckField) Check(msg types.Message) bool

Check attempts to check a message part against a configured condition

type CheckFieldConfig 

type CheckFieldConfig struct {
	Parts     []int   `json:"parts" yaml:"parts"`
	Path      string  `json:"path" yaml:"path"`
	Condition *Config `json:"condition" yaml:"condition"`
}

CheckFieldConfig contains configuration fields for the CheckField condition.

func NewCheckFieldConfig 

func NewCheckFieldConfig() CheckFieldConfig

NewCheckFieldConfig returns a CheckFieldConfig with default values.

func (CheckFieldConfig) MarshalJSON 

func (c CheckFieldConfig) MarshalJSON() ([]byte, error)

MarshalJSON prints an empty object instead of nil.

func (CheckFieldConfig) MarshalYAML 

func (c CheckFieldConfig) MarshalYAML() (interface{}, error)

MarshalYAML prints an empty object instead of nil.

type CheckInterpolation 

type CheckInterpolation struct {
	// contains filtered or unexported fields
}

CheckInterpolation is a condition that resolves an interpolated string field and checks the contents against a child condition.

func (*CheckInterpolation) Check 

func (c *CheckInterpolation) Check(msg types.Message) bool

Check attempts to check a message part against a configured condition

type CheckInterpolationConfig 

type CheckInterpolationConfig struct {
	Value     string  `json:"value" yaml:"value"`
	Condition *Config `json:"condition" yaml:"condition"`
}

CheckInterpolationConfig contains configuration fields for the CheckInterpolation condition.

func NewCheckInterpolationConfig 

func NewCheckInterpolationConfig() CheckInterpolationConfig

NewCheckInterpolationConfig returns a CheckInterpolationConfig with default values.

func (CheckInterpolationConfig) MarshalJSON 

func (c CheckInterpolationConfig) MarshalJSON() ([]byte, error)

MarshalJSON prints an empty object instead of nil.

func (CheckInterpolationConfig) MarshalYAML 

func (c CheckInterpolationConfig) MarshalYAML() (interface{}, error)

MarshalYAML prints an empty object instead of nil.

type Config 

type Config struct {
	Type               string                   `json:"type" yaml:"type"`
	All                AllConfig                `json:"all" yaml:"all"`
	And                AndConfig                `json:"and" yaml:"and"`
	Any                AnyConfig                `json:"any" yaml:"any"`
	BoundsCheck        BoundsCheckConfig        `json:"bounds_check" yaml:"bounds_check"`
	CheckField         CheckFieldConfig         `json:"check_field" yaml:"check_field"`
	CheckInterpolation CheckInterpolationConfig `json:"check_interpolation" yaml:"check_interpolation"`
	Count              CountConfig              `json:"count" yaml:"count"`
	JMESPath           JMESPathConfig           `json:"jmespath" yaml:"jmespath"`
	Not                NotConfig                `json:"not" yaml:"not"`
	Number             NumberConfig             `json:"number" yaml:"number"`
	Metadata           MetadataConfig           `json:"metadata" yaml:"metadata"`
	Or                 OrConfig                 `json:"or" yaml:"or"`
	Plugin             interface{}              `json:"plugin,omitempty" yaml:"plugin,omitempty"`
	ProcessorFailed    ProcessorFailedConfig    `json:"processor_failed" yaml:"processor_failed"`
	Resource           string                   `json:"resource" yaml:"resource"`
	Static             bool                     `json:"static" yaml:"static"`
	Text               TextConfig               `json:"text" yaml:"text"`
	Xor                XorConfig                `json:"xor" yaml:"xor"`
}

Config is the all encompassing configuration struct for all condition types.

func NewConfig 

func NewConfig() Config

NewConfig returns a configuration struct fully populated with default values.

func (*Config) UnmarshalYAML 

func (m *Config) UnmarshalYAML(value *yaml.Node) error

UnmarshalYAML ensures that when parsing configs that are in a slice the default values are still applied.

type Count 

type Count struct {
	// contains filtered or unexported fields
}

Count is a condition that counts each message and returns false once a target count has been reached, at which point it resets the counter and starts again.

func (*Count) Check 

func (c *Count) Check(msg types.Message) bool

Check attempts to check a message part against a configured condition.

type CountConfig 

type CountConfig struct {
	Arg int `json:"arg" yaml:"arg"`
}

CountConfig is a configuration struct containing fields for the Count condition.

func NewCountConfig 

func NewCountConfig() CountConfig

NewCountConfig returns a CountConfig with default values.

type JMESPath 

type JMESPath struct {
	// contains filtered or unexported fields
}

JMESPath is a condition that checks message against a jmespath query.

func (*JMESPath) Check 

func (c *JMESPath) Check(msg types.Message) bool

Check attempts to check a message part against a configured condition.

type JMESPathConfig 

type JMESPathConfig struct {
	Part  int    `json:"part" yaml:"part"`
	Query string `json:"query" yaml:"query"`
}

JMESPathConfig is a configuration struct containing fields for the jmespath condition.

func NewJMESPathConfig 

func NewJMESPathConfig() JMESPathConfig

NewJMESPathConfig returns a JMESPathConfig with default values.

type Metadata 

type Metadata struct {
	// contains filtered or unexported fields
}

Metadata is a condition that checks message text against logical operators.

func (*Metadata) Check 

func (c *Metadata) Check(msg types.Message) bool

Check attempts to check a message part against a configured condition.

type MetadataConfig 

type MetadataConfig struct {
	Operator string      `json:"operator" yaml:"operator"`
	Part     int         `json:"part" yaml:"part"`
	Key      string      `json:"key" yaml:"key"`
	Arg      interface{} `json:"arg" yaml:"arg"`
}

MetadataConfig is a configuration struct containing fields for the metadata condition.

func NewMetadataConfig 

func NewMetadataConfig() MetadataConfig

NewMetadataConfig returns a MetadataConfig with default values.

type Not 

type Not struct {
	// contains filtered or unexported fields
}

Not is a condition that returns the opposite of a child condition.

func (*Not) Check 

func (c *Not) Check(msg types.Message) bool

Check attempts to check a message part against a configured condition.

type NotConfig 

type NotConfig struct {
	*Config `yaml:",inline" json:",inline"`
}

NotConfig is a configuration struct containing fields for the Not condition.

func NewNotConfig 

func NewNotConfig() NotConfig

NewNotConfig returns a NotConfig with default values.

func (NotConfig) MarshalJSON 

func (m NotConfig) MarshalJSON() ([]byte, error)

MarshalJSON prints an empty object instead of nil.

func (NotConfig) MarshalYAML 

func (m NotConfig) MarshalYAML() (interface{}, error)

MarshalYAML prints an empty object instead of nil.

func (*NotConfig) UnmarshalJSON 

func (m *NotConfig) UnmarshalJSON(bytes []byte) error

UnmarshalJSON ensures that when parsing child config it is initialised.

func (*NotConfig) UnmarshalYAML 

func (m *NotConfig) UnmarshalYAML(unmarshal func(interface{}) error) error

UnmarshalYAML ensures that when parsing child config it is initialised.

type Number 

type Number struct {
	// contains filtered or unexported fields
}

Number is a condition that checks messages interpretted as numbers against logical operators.

func (*Number) Check 

func (c *Number) Check(msg types.Message) bool

Check attempts to check a message part against a configured condition.

type NumberConfig 

type NumberConfig struct {
	Operator string  `json:"operator" yaml:"operator"`
	Part     int     `json:"part" yaml:"part"`
	Arg      float64 `json:"arg" yaml:"arg"`
}

NumberConfig is a configuration struct containing fields for the number condition.

func NewNumberConfig 

func NewNumberConfig() NumberConfig

NewNumberConfig returns a NumberConfig with default values.

type Or 

type Or struct {
	// contains filtered or unexported fields
}

Or is a condition that returns the logical or of all children.

func (*Or) Check 

func (c *Or) Check(msg types.Message) bool

Check attempts to check a message part against a configured condition.

type OrConfig 

type OrConfig []Config

OrConfig is a configuration struct containing fields for the Or condition.

func NewOrConfig 

func NewOrConfig() OrConfig

NewOrConfig returns a OrConfig with default values.

type PluginConfigConstructor 

type PluginConfigConstructor func() interface{}

PluginConfigConstructor is a func that returns a pointer to a new and fully populated configuration struct for a plugin type.

type PluginConfigSanitiser 

type PluginConfigSanitiser func(conf interface{}) interface{}

PluginConfigSanitiser is a function that takes a configuration object for a plugin and returns a sanitised (minimal) version of it for printing in examples and plugin documentation.

This function is useful for when a plugins configuration struct is very large and complex, but can sometimes be expressed in a more concise way without losing the original intent.

type PluginConstructor 

type PluginConstructor func(
	config interface{},
	manager types.Manager,
	logger log.Modular,
	metrics metrics.Type,
) (types.Condition, error)

PluginConstructor is a func that constructs a Benthos condition plugin. These are plugins that are specific to certain use cases, experimental, private or otherwise unfit for widespread general use. Any number of plugins can be specified when using Benthos as a framework.

The configuration object will be the result of the PluginConfigConstructor after overlaying the user configuration.

type ProcessorFailed 

type ProcessorFailed struct {
	// contains filtered or unexported fields
}

ProcessorFailed is a condition that checks whether processing steps have failed for a message.

func (*ProcessorFailed) Check 

func (p *ProcessorFailed) Check(msg types.Message) bool

Check attempts to check a message part against a configured condition.

type ProcessorFailedConfig 

type ProcessorFailedConfig struct {
	Part int `json:"part" yaml:"part"`
}

ProcessorFailedConfig is a configuration struct containing fields for the processor_failed condition.

func NewProcessorFailedConfig 

func NewProcessorFailedConfig() ProcessorFailedConfig

NewProcessorFailedConfig returns a ProcessorFailedConfig with default values.

type Resource 

type Resource struct {
	// contains filtered or unexported fields
}

Resource is a condition that returns the result of a condition resource.

func (*Resource) Check 

func (c *Resource) Check(msg types.Message) bool

Check attempts to check a message part against a configured condition.

type Static 

type Static struct {
	// contains filtered or unexported fields
}

Static is a condition that always returns a static boolean value.

func (*Static) Check 

func (s *Static) Check(msg types.Message) bool

Check attempts to check a message part against a configured condition.

type Text 

type Text struct {
	// contains filtered or unexported fields
}

Text is a condition that checks message text against logical operators.

func (*Text) Check 

func (c *Text) Check(msg types.Message) bool

Check attempts to check a message part against a configured condition.

type TextConfig 

type TextConfig struct {
	Operator string      `json:"operator" yaml:"operator"`
	Part     int         `json:"part" yaml:"part"`
	Arg      interface{} `json:"arg" yaml:"arg"`
}

TextConfig is a configuration struct containing fields for the text condition.

func NewTextConfig 

func NewTextConfig() TextConfig

NewTextConfig returns a TextConfig with default values.

type Type 

type Type interface {
	// Check tests a message against a configured condition.
	Check(msg types.Message) bool
}

Type reads a message, calculates a condition and returns a boolean.

func New 

func New(conf Config, mgr types.Manager, log log.Modular, stats metrics.Type) (Type, error)

New creates a condition type based on a condition configuration.

func NewAll 

func NewAll(
	conf Config, mgr types.Manager, log log.Modular, stats metrics.Type,
) (Type, error)

NewAll returns an All condition.

func NewAnd 

func NewAnd(
	conf Config, mgr types.Manager, log log.Modular, stats metrics.Type,
) (Type, error)

NewAnd returns an And condition.

func NewAny 

func NewAny(
	conf Config, mgr types.Manager, log log.Modular, stats metrics.Type,
) (Type, error)

NewAny returns an Any condition.

func NewBoundsCheck 

func NewBoundsCheck(
	conf Config, mgr types.Manager, log log.Modular, stats metrics.Type,
) (Type, error)

NewBoundsCheck returns a BoundsCheck condition.

func NewCheckField 

func NewCheckField(
	conf Config, mgr types.Manager, log log.Modular, stats metrics.Type,
) (Type, error)

NewCheckField returns a CheckField condition.

func NewCheckInterpolation 

func NewCheckInterpolation(
	conf Config, mgr types.Manager, log log.Modular, stats metrics.Type,
) (Type, error)

NewCheckInterpolation returns a CheckInterpolation condition.

func NewCount 

func NewCount(
	conf Config, mgr types.Manager, log log.Modular, stats metrics.Type,
) (Type, error)

NewCount returns a Count condition.

func NewJMESPath 

func NewJMESPath(
	conf Config, mgr types.Manager, log log.Modular, stats metrics.Type,
) (Type, error)

NewJMESPath returns a JMESPath condition.

func NewMetadata 

func NewMetadata(
	conf Config, mgr types.Manager, log log.Modular, stats metrics.Type,
) (Type, error)

NewMetadata returns a Metadata condition.

func NewNot 

func NewNot(
	conf Config, mgr types.Manager, log log.Modular, stats metrics.Type,
) (Type, error)

NewNot returns a Not condition.

func NewNumber 

func NewNumber(
	conf Config, mgr types.Manager, log log.Modular, stats metrics.Type,
) (Type, error)

NewNumber returns a number condition.

func NewOr 

func NewOr(
	conf Config, mgr types.Manager, log log.Modular, stats metrics.Type,
) (Type, error)

NewOr returns an Or condition.

func NewProcessorFailed 

func NewProcessorFailed(
	conf Config, mgr types.Manager, log log.Modular, stats metrics.Type,
) (Type, error)

NewProcessorFailed returns a ProcessorFailed condition.

func NewResource 

func NewResource(
	conf Config, mgr types.Manager, log log.Modular, stats metrics.Type,
) (Type, error)

NewResource returns a resource condition.

func NewStatic 

func NewStatic(
	conf Config, mgr types.Manager, log log.Modular, stats metrics.Type,
) (Type, error)

NewStatic returns a Static condition.

func NewText 

func NewText(
	conf Config, mgr types.Manager, log log.Modular, stats metrics.Type,
) (Type, error)

NewText returns a Text condition.

func NewXor 

func NewXor(
	conf Config, mgr types.Manager, log log.Modular, stats metrics.Type,
) (Type, error)

NewXor returns an Xor condition.

type TypeSpec 

type TypeSpec struct {
	// contains filtered or unexported fields
}

TypeSpec Constructor and a usage description for each condition type.

type Xor 

type Xor struct {
	// contains filtered or unexported fields
}

Xor is a condition that returns the logical xor of all children.

func (*Xor) Check 

func (c *Xor) Check(msg types.Message) bool

Check attempts to check a message part against a configured condition.

type XorConfig 

type XorConfig []Config

XorConfig is a configuration struct containing fields for the Xor condition.

func NewXorConfig 

func NewXorConfig() XorConfig

NewXorConfig returns a XorConfig with default values.

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