config

package
v1.0.6-10 Latest Latest
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 Go to latest Published: Oct 7, 2022 License: MIT Imports: 11 Imported by: 2

Documentation

Index

Constants

View Source 
const FileConfigReaderPathKey = "path"

FileConfigReaderPathKey is a constant for path key

View Source 
const SectionNameParameters = "parameters"

SectionNameParameters is a name of ConfigReader section

Variables

View Source 
var JsonConfigReaderDescriptor = refer.NewDescriptor("pip-services", "config-reader", "json", "*", "1.0")
View Source 
var MemoryConfigReaderDescriptor = refer.NewDescriptor("pip-services", "config-reader", "memory", "*", "1.0")
View Source 
var YamlConfigReaderDescriptor = refer.NewDescriptor("pip-services", "config-reader", "yaml", "*", "1.0")

Functions

func NewDefaultConfigReaderFactory 

func NewDefaultConfigReaderFactory() *build.Factory

NewDefaultConfigReaderFactory create a new instance of the factory. 

Returns: *build.Factory

func ReadJsonConfig 

func ReadJsonConfig(ctx context.Context, correlationId string, path string,
	parameters *cconfig.ConfigParams) (*cconfig.ConfigParams, error)

ReadJsonConfig reads configuration from a file, parameterize it with given values and returns a new ConfigParams object. 

Parameters:
	- ctx context.Context
	- correlationId string transaction id to trace execution through call chain.
	- path string
	- parameters *cconfig.ConfigParams values to parameters the configuration.
Returns: *cconfig.ConfigParams, error

func ReadJsonObject 

func ReadJsonObject(ctx context.Context, correlationId string, path string,
	parameters *cconfig.ConfigParams) (any, error)

ReadJsonObject reads configuration file, parameterizes its content and converts it into JSON object. 

Parameters:
	- ctx context.Context
	- correlationId string transaction id to trace execution through call chain.
	- path string
	- parameters *cconfig.ConfigParams values to parameters the configuration.
Returns: any, error a JSON object with configuration.

func ReadYamlConfig 

func ReadYamlConfig(ctx context.Context, correlationId string, path string,
	parameters *cconfig.ConfigParams) (*cconfig.ConfigParams, error)

ReadYamlConfig reads configuration from a file, parameterize it with given values and returns a new ConfigParams object. 

Parameters:
	- ctx context.Context
	- correlationId string transaction id to trace execution through call chain.
	- path string
	- parameters *cconfig.ConfigParams values to parameters the configuration.
Returns: *cconfig.ConfigParams, error

func ReadYamlObject 

func ReadYamlObject(ctx context.Context, correlationId string, path string,
	parameters *cconfig.ConfigParams) (any, error)

ReadYamlObject reads configuration file, parameterizes its content and converts it into JSON object. 

Parameters:
	- ctx context.Context
	- correlationId string transaction id to trace execution through call chain.
	- path string
	- parameters *cconfig.ConfigParams values to parameters the configuration.
Returns: any, error a JSON object with configuration.

Types

type ConfigReader 

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

ConfigReader abstract config reader that supports configuration parameterization. 

Configuration parameters:
	parameters this entire section is used as template parameters

func NewConfigReader 

func NewConfigReader() *ConfigReader

NewConfigReader creates a new instance of the config reader. 

Returns: *ConfigReader

func (*ConfigReader) AddChangeListener added in v1.0.4 

func (c *ConfigReader) AddChangeListener(ctx context.Context, listener crun.INotifiable)

AddChangeListener - Adds a listener that will be notified when configuration is changed

func (*ConfigReader) Configure 

func (c *ConfigReader) Configure(ctx context.Context, config *cconfig.ConfigParams)

Configure configures component by passing configuration parameters. 

Parameters:
	- ctx context.Context
	- config *config.ConfigParams configuration parameters to be set.

func (*ConfigReader) Parameterize 

func (c *ConfigReader) Parameterize(config string, parameters *cconfig.ConfigParams) (string, error)

Parameterize configuration template given as string with dynamic parameters. The method uses Mustache template engine implemented in expressions module 

Parameters:
	- config string a string with configuration template to be parameterized
	- parameters *config.ConfigParams dynamic parameters to inject into the template
Returns: string, error a parameterized configuration string abd error.

func (*ConfigReader) RemoveChangeListener added in v1.0.4 

func (c *ConfigReader) RemoveChangeListener(ctx context.Context, listener crun.INotifiable)

RemoveChangeListener - Remove a previously added change listener.

type FileConfigReader 

type FileConfigReader struct {
	*ConfigReader
	// contains filtered or unexported fields
}

FileConfigReader is an abstract config reader that reads configuration from a file. Child classes add support for config files in their specific format like JSON, YAML or property files. 

Configuration parameters:
	- path: path to configuration file
	- parameters: this entire section is used as template parameters

func NewEmptyFileConfigReader 

func NewEmptyFileConfigReader() *FileConfigReader

NewEmptyFileConfigReader creates a new instance of the config reader. 

Returns: *FileConfigReader

func NewFileConfigReader 

func NewFileConfigReader(path string) *FileConfigReader

NewFileConfigReader creates a new instance of the config reader. 

Parameters:
	- path string a path to configuration file.
Returns: *FileConfigReader

func (*FileConfigReader) Configure 

func (c *FileConfigReader) Configure(ctx context.Context, config *cconfig.ConfigParams)

Configure component by passing configuration parameters. 

Parameters:
	- ctx context.Context
	- config *cconfig.ConfigParams configuration parameters to be set.

func (*FileConfigReader) Path 

func (c *FileConfigReader) Path() string

Path get the path to configuration file.. 

Returns: string the path to configuration file.

func (*FileConfigReader) SetPath 

func (c *FileConfigReader) SetPath(path string)

SetPath set the path to configuration file. 

Parameters:
	- path string a new path to configuration file.

type IConfigReader 

type IConfigReader interface {

	// ReadConfig reads configuration and parameterize it with given values.
	ReadConfig(ctx context.Context, correlationId string, parameters *cconfig.ConfigParams) (*cconfig.ConfigParams, error)

	// AddChangeListener adds a listener that will be notified when configuration is changed
	AddChangeListener(ctx context.Context, listener crun.INotifiable)

	// RemoveChangeListener remove a previously added change listener.
	RemoveChangeListener(ctx context.Context, listener crun.INotifiable)
}

IConfigReader Interface for configuration readers that retrieve configuration from various sources and make it available for other components. Some IConfigReader implementations may support configuration parameterization. The parameterization allows using configuration as a template and inject there dynamic values. The values may come from application command like arguments or environment variables.

type JsonConfigReader 

type JsonConfigReader struct {
	*FileConfigReader
}

JsonConfigReader is a config reader that reads configuration from JSON file. The reader supports parameterization using Handlebar template engine. 

Configuration parameters:
	- path: path to configuration file
	- parameters: this entire section is used as template parameters
	- ...
see IConfigReader
see FileConfigReader
Example:
	======== config.json ======
	{ "key1": "{{KEY1_VALUE}}", "key2": "{{KEY2_VALUE}}" }
	===========================

	configReader := NewJsonConfigReader("config.json")
	parameters := NewConfigParamsFromTuples("KEY1_VALUE", 123, "KEY2_VALUE", "ABC")
	res, err := configReader.ReadConfig(context.Background(), "123", parameters)

func NewEmptyJsonConfigReader 

func NewEmptyJsonConfigReader() *JsonConfigReader

NewEmptyJsonConfigReader creates a new instance of the config reader. 

Returns: *JsonConfigReader

func NewJsonConfigReader 

func NewJsonConfigReader(path string) *JsonConfigReader

NewJsonConfigReader creates a new instance of the config reader. 

Parameters: path string a path to configuration file.
Returns: *JsonConfigReader

func (*JsonConfigReader) ReadConfig 

func (c *JsonConfigReader) ReadConfig(ctx context.Context, correlationId string,
	parameters *cconfig.ConfigParams) (result *cconfig.ConfigParams, err error)

ReadConfig кeads configuration from a file, parameterize it with given values and returns a new ConfigParams object. 

Parameters:
	- ctx context.Context
	- correlationId string transaction id to trace execution through call chain.
	- parameters *cconfig.ConfigParams values to parameters the configuration.
Returns: *cconfig.ConfigParams, error

func (*JsonConfigReader) ReadObject 

func (c *JsonConfigReader) ReadObject(ctx context.Context, correlationId string,
	parameters *cconfig.ConfigParams) (any, error)

ReadObject reads configuration file, parameterizes its content and converts it into JSON object. 

Parameters:
	- ctx context.Context
	- correlationId string transaction id to trace execution through call chain.
	- parameters *cconfig.ConfigParams values to parameters the configuration.
Returns: any, error a JSON object with configuration adn error.

type MemoryConfigReader 

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

MemoryConfigReader is a config reader that stores configuration in memory. The reader supports parameterization using Mustache template engine implemented in expressions module. Configuration parameters: The configuration parameters are the configuration template 

see IConfigReader
Example
	config := NewConfigParamsFromTuples(
		"connection.host", "{{SERVICE_HOST}}",
		"connection.port", "{{SERVICE_PORT}}{{^SERVICE_PORT}}8080{{/SERVICE_PORT}}"
	);
	configReader := NewMemoryConfigReader();
	configReader.Configure(context.Background(), config);
	parameters := NewConfigParamsFromValue(process.env);
	res, err := configReader.ReadConfig(context.Background(), "123", parameters);
		Possible result: connection.host=10.1.1.100;connection.port=8080

func NewEmptyMemoryConfigReader 

func NewEmptyMemoryConfigReader() *MemoryConfigReader

NewEmptyMemoryConfigReader creates a new instance of config reader. 

Returns: *MemoryConfigReader

func NewMemoryConfigReader 

func NewMemoryConfigReader(config *cconfig.ConfigParams) *MemoryConfigReader

NewMemoryConfigReader creates a new instance of config reader. 

Parameters: config *cconfig.ConfigParams component configuration parameters
Returns: *MemoryConfigReader

func (*MemoryConfigReader) AddChangeListener added in v1.0.4 

func (c *MemoryConfigReader) AddChangeListener(ctx context.Context, listener crun.INotifiable)

AddChangeListener - Adds a listener that will be notified when configuration is changed

func (*MemoryConfigReader) Configure 

func (c *MemoryConfigReader) Configure(ctx context.Context, config *cconfig.ConfigParams)

Configure component by passing configuration parameters. 

Parameters:
	- ctx context.Context
	- config *cconfig.ConfigParams configuration parameters to be set.

func (*MemoryConfigReader) ReadConfig 

func (c *MemoryConfigReader) ReadConfig(ctx context.Context, correlationId string,
	parameters *cconfig.ConfigParams) (*cconfig.ConfigParams, error)

ReadConfig reads configuration and parameterize it with given values. 

Parameters:
	- ctx context.Context
	- correlationId string transaction id to trace execution through call chain.
	- parameters *cconfig.ConfigParams values to parameters
		the configuration or null to skip parameterization.
Returns: *cconfig.ConfigParams, error configuration or error.

func (*MemoryConfigReader) RemoveChangeListener added in v1.0.4 

func (c *MemoryConfigReader) RemoveChangeListener(ctx context.Context, listener crun.INotifiable)

RemoveChangeListener - Remove a previously added change listener.

type YamlConfigReader 

type YamlConfigReader struct {
	*FileConfigReader
}

YamlConfigReader is a config reader that reads configuration from YAML file. The reader supports parameterization using Handlebars template engine. 

Configuration parameters:
	- path: path to configuration file
	- parameters: this entire section is used as template parameters
	...
see IConfigReader
see FileConfigReader
Example:
	======== config.yml ======
	key1: "{{KEY1_VALUE}}"
	key2: "{{KEY2_VALUE}}"
	===========================

	configReader := NewYamlConfigReader("config.yml")
	parameters := NewConfigParamsFromTuples("KEY1_VALUE", 123, "KEY2_VALUE", "ABC");
	res, err := configReader.ReadConfig(context.Background(), "123", parameters);
		// Result: key1=123;key2=ABC

func NewEmptyYamlConfigReader 

func NewEmptyYamlConfigReader() *YamlConfigReader

NewEmptyYamlConfigReader сreates a new instance of the config reader. 

Returns: *YamlConfigReader

func NewYamlConfigReader 

func NewYamlConfigReader(path string) *YamlConfigReader

NewYamlConfigReader creates a new instance of the config reader. 

Parameters: path string a path to configuration file.
Returns: *YamlConfigReader

func (*YamlConfigReader) ReadConfig 

func (c *YamlConfigReader) ReadConfig(ctx context.Context, correlationId string,
	parameters *cconfig.ConfigParams) (result *cconfig.ConfigParams, err error)

ReadConfig reads configuration from a file, parameterize it with given values and returns a new ConfigParams object. 

Parameters:
	- ctx context.Context
	- correlationId string transaction id to trace execution through call chain.
	- parameters *cconfig.ConfigParams values to parameters the configuration.
Returns: *cconfig.ConfigParams, error

func (*YamlConfigReader) ReadObject 

func (c *YamlConfigReader) ReadObject(ctx context.Context, correlationId string,
	parameters *cconfig.ConfigParams) (any, error)

ReadObject reads configuration file, parameterizes its content and converts it into JSON object. 

Parameters:
	- ctx context.Context
	- correlationId string transaction id to trace execution through call chain.
	- parameters *cconfig.ConfigParams values to parameters the configuration.
Returns: any, error a JSON object with configuration adn error.

Source Files

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