goutils

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 Go to latest Published: Jan 6, 2024 License: MIT Imports: 23 Imported by: 26

README

Golang Support Packages

MIT Go Report Card CICD

Provides common support components used in other Golang projects.

Components Provided

Component Description Note
Component Base struct for other components Contains the support method NewLogTagsForContext which generates a new copy of the apex logs.Fields metadata structure.
RestAPIHandler Base struct for other REST API handlers Contains utility methods, and a REST request logging middleware.
TaskProcessor An asynchronous job queue system Provides single threaded and multi threaded worker pool implementation.
IntervalTimer Task execution trigger interval timer Operates in periodic or one-shot mode.
PubSubClient PubSub client providing higher layer APIs
RequestResponseClient Support request-response pattern between multiple nodes, where any node can request any other node/s. Currently, SDK only provides a PubSub based client.
MessageBus Application-scoped message passing bus

Getting Started

The provided Makefile contains targets for various development actions. Starting out

make

to prepare the development and verify linters pass. Verify project is working with

NOTE: The PubSub related tests required GCP credential configuration JSON, and the name of the GCP project provided as ENV variables.

  • UNITTEST_GCP_PROJECT_ID - GCP project ID name
  • GOOGLE_APPLICATION_CREDENTIALS - GCP authentication config JSON
make test

to execute all unit-tests.

Documentation

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func CreateBasicGCPPubSubClient added in v0.4.0 

func CreateBasicGCPPubSubClient(ctxt context.Context, projectID string) (*pubsub.Client, error)

CreateBasicGCPPubSubClient define a basic GCP PubSub client 

@param ctxt context.Context - execution context
@param projectID string - GCP project ID
@returns new client

func DefineHTTPClient added in v0.6.1 

func DefineHTTPClient(
	parentCtxt context.Context,
	retryConfig HTTPClientRetryConfig,
	authConfig *HTTPClientAuthConfig,
) (*resty.Client, error)

DefineHTTPClient helper function to define a resty HTTP client 

@param parentCtxt context.Context - caller context
@param retryConfig HTTPClientRetryConfig - HTTP client retry config
@param authConfig *HTTPClientAuthConfig - HTTP client auth config
@returns new resty client

func ModifyLogMetadataByRestRequestParam 

func ModifyLogMetadataByRestRequestParam(ctxt context.Context, theTags log.Fields)

ModifyLogMetadataByRestRequestParam update log metadata with info from RestRequestParam 

@param ctxt context.Context - a request context
@param theTags log.Fields - a log metadata to update

func TimeBoundedWaitGroupWait added in v0.4.0 

func TimeBoundedWaitGroupWait(
	wgCtxt context.Context, wg *sync.WaitGroup, timeout time.Duration,
) error

TimeBoundedWaitGroupWait is a wrapper around wait group wait with a time limit 

@param wgCtxt context.Context - context associated with the wait group
@param wg *sync.WaitGroup - the wait group to
@param timeout time.Duration - wait timeout duration

Types

type ClientCredOAuthTokenManagerParam added in v0.5.0 

type ClientCredOAuthTokenManagerParam struct {
	// IDPIssuerURL OpenID provider issuing URL
	IDPIssuerURL string `validate:"required,url"`
	// ClientID OAuth client ID
	ClientID string `validate:"required"`
	// ClientSecret OAuth client secret
	ClientSecret string `validate:"required"`
	// TargetAudience the token's target audience
	TargetAudience string `validate:"required,url"`
	// LogTags metadata fields to include in the logs
	LogTags log.Fields
	// CustomLogModifiers additional log metadata modifiers to use
	CustomLogModifiers []LogMetadataModifier
}

ClientCredOAuthTokenManagerParam configuration for client credential flow oauth token manager

type Component 

type Component struct {
	// LogTags the Apex logging message metadata tags
	LogTags log.Fields
	// LogTagModifiers is the list of log metadata modifier callbacks
	LogTagModifiers []LogMetadataModifier
}

Component is the base structure for all components

func (Component) GetLogTagsForContext 

func (c Component) GetLogTagsForContext(ctxt context.Context) log.Fields

GetLogTagsForContext creates a new Apex log.Fields metadata structure for a specific context 

@param ctxt context.Context - a request context
@return the new Apec log.Fields metadata

func (Component) NewLogTagsForContext 

func (c Component) NewLogTagsForContext() log.Fields

NewLogTagsForContext generates a new deep-copied LogTags for an execution context 

@return a new log.Fields

type ErrorDetail 

type ErrorDetail struct {
	// Code is the response code
	Code int `json:"code" validate:"required"`
	// Msg is an optional descriptive message
	Msg string `json:"message,omitempty"`
	// Detail is an optional descriptive message providing additional details on the error
	Detail string `json:"detail,omitempty"`
}

ErrorDetail is the response detail in case of error

type HTTPClientAuthConfig added in v0.6.1 

type HTTPClientAuthConfig struct {
	// IssuerURL OpenID provider issuer URL
	IssuerURL string `json:"issuer"`
	// ClientID OAuth client ID
	ClientID string `json:"client_id"`
	// ClientSecret OAuth client secret
	ClientSecret string `json:"client_secret"`
	// TargetAudience target audience `aud` to acquire a token for
	TargetAudience string `json:"target_audience"`
	// LogTags auth middleware log tags
	LogTags log.Fields
}

HTTPClientAuthConfig HTTP client OAuth middleware configuration

Currently only support client-credential OAuth flow configuration

type HTTPClientRetryConfig added in v0.6.1 

type HTTPClientRetryConfig struct {
	// MaxAttempts max number of retry attempts
	MaxAttempts int `json:"max_attempts"`
	// InitWaitTime wait time before the first wait retry
	InitWaitTime time.Duration `json:"initialWaitTimeInSec"`
	// MaxWaitTime max wait time
	MaxWaitTime time.Duration `json:"maxWaitTimeInSec"`
}

HTTPClientRetryConfig HTTP client config retry configuration

type HTTPRequestLogLevel added in v0.5.1 

type HTTPRequestLogLevel string

HTTPRequestLogLevel HTTP request log level data type 

const (
	HTTPLogLevelWARN  HTTPRequestLogLevel = "warn"
	HTTPLogLevelINFO  HTTPRequestLogLevel = "info"
	HTTPLogLevelDEBUG HTTPRequestLogLevel = "debug"
)

HTTP request log levels

type HTTPRequestMetricHelper added in v0.6.0 

type HTTPRequestMetricHelper interface {
	/*
		RecordRequest record parameters regarding a request to the metrics

			@param method string - HTTP request method
			@param status int - HTTP response status
			@param latency time.Duration - delay between request received, and response sent
			@param respSize int64 - HTTP response size in bytes
	*/
	RecordRequest(method string, status int, latency time.Duration, respSize int64)
}

HTTPRequestMetricHelper HTTP request metric recording helper agent

type HTTPRequestRetryParam added in v0.5.0 

type HTTPRequestRetryParam struct {
	// MaxRetires maximum number of retries
	MaxRetires int
	// InitialWaitTime the initial retry wait time
	InitialWaitTime time.Duration
	// MaxWaitTime the max retry wait time
	MaxWaitTime time.Duration
}

HTTPRequestRetryParam HTTP client request retry parameters

type IntervalTimer 

type IntervalTimer interface {
	/*
		Start starts timer with a specific timeout interval, and the callback to trigger on timeout.

		If oneShort, cancel after first timeout.

		 @param interval time.Duration - timeout interval
		 @param handler TimeoutHandler - handler to trigger on timeout
		 @param oneShort bool - if true, timer stop after first activation
	*/
	Start(interval time.Duration, handler TimeoutHandler, oneShort bool) error

	/*
		Stop stops the timer
	*/
	Stop() error
}

IntervalTimer is a support interface for triggering events at specific intervals

func GetIntervalTimerInstance 

func GetIntervalTimerInstance(
	rootCtxt context.Context, wg *sync.WaitGroup, logTags log.Fields,
) (IntervalTimer, error)

GetIntervalTimerInstance get an implementation instance of IntervalTimer 

@param rootCtxt context.Context - the base Context the timer will derive new runtime context from
  each time Start is called.
@param wg *sync.WaitGroup - WaitGroup use by timer
@param logTags log.Fields - log metadata fields
@return an IntervalTimer instance

type LogMetadataModifier 

type LogMetadataModifier func(context.Context, log.Fields)

LogMetadataModifier is the function signature of a callback to update log.Fields with additional key-value pairs.

type MessageBus added in v0.6.2 

type MessageBus interface {
	/*
		CreateTopic create new message topic

			@param ctxt context.Context - execution context
			@param topicName string - topic name
			@param topicLogTags log.Fields - metadata fields to include in the logs of the topic entity
			@return new MessageTopic instance
	*/
	CreateTopic(
		ctxt context.Context, topicName string, topicLogTags log.Fields,
	) (MessageTopic, error)

	/*
		GetTopic fetch a message topic

			@param ctxt context.Context - execution context
			@param topicName string - topic name
			@returns MessageTopic instance
	*/
	GetTopic(ctxt context.Context, topicName string) (MessageTopic, error)

	/*
		DeleteTopic delete a message topic

			@param ctxt context.Context - execution context
			@param topicName string - topic name
	*/
	DeleteTopic(ctxt context.Context, topicName string) error
}

MessageBus an application scoped local message bus

func GetNewMessageBusInstance added in v0.6.2 

func GetNewMessageBusInstance(parentCtxt context.Context, logTags log.Fields) (MessageBus, error)

GetNewMessageBusInstance get message bus instance 

@param parentCtxt context.Context - parent execution context
@param logTags log.Fields - metadata fields to include in the logs
@return new MessageBus instance

type MessageTopic added in v0.6.2 

type MessageTopic interface {
	/*
		Publish publish a message on the topic in parallel.

			@param ctxt context.Context - execution context
			@param message interface{} - the message to send
			@param blockFor time.Duration - how long to block for the publish to complete. If >0,
			    this is a non-blocking call; blocking call otherwise.
	*/
	Publish(ctxt context.Context, message interface{}, blockFor time.Duration) error

	/*
		CreateSubscription create a new topic subscription

			@param ctxt context.Context - execution context
			@param subscriber string - name of the subscription
			@param bufferLen int - length of message buffer
			@returns the channel to receive messages on
	*/
	CreateSubscription(
		ctxt context.Context, subscriber string, bufferLen int,
	) (chan interface{}, error)

	/*
		DeleteSubscription delete an existing topic subscription

			@param ctxt context.Context - execution context
			@param subscriber string - subscription to delete
	*/
	DeleteSubscription(ctxt context.Context, subscriber string) error
}

MessageTopic a message bus topic, responsible for managing its child subscriptions.

type MetricsCollector added in v0.6.0 

type MetricsCollector interface {
	/*
		InstallApplicationMetrics install trackers for Golang application execution metrics
	*/
	InstallApplicationMetrics()

	/*
		InstallHTTPMetrics install trackers for HTTP request metrics collection. This will return
		a helper agent to record the metrics.

			@returns request metrics logging agent
	*/
	InstallHTTPMetrics() HTTPRequestMetricHelper

	/*
		InstallPubSubMetrics install trackers for PubSub messaging collection. This will return
		a helper agent to record the metrics.

			@return PubSub metrics logging agent
	*/
	InstallPubSubMetrics() PubSubMetricHelper

	/*
		InstallCustomCounterVecMetrics install new custom `CounterVec` metrics

			@param ctxt context.Context - execution context
			@param metricsName string - metrics name
			@param metricsHelpMessage string - metrics help message
			@param metricsLabels []string - labels to support
			@returns new `CounterVec` handle
	*/
	InstallCustomCounterVecMetrics(
		ctxt context.Context, metricsName string, metricsHelpMessage string, metricsLabels []string,
	) (*prometheus.CounterVec, error)

	/*
		InstallCustomGaugeVecMetrics install new custom `GaugeVec` metrics

			@param ctxt context.Context - execution context
			@param metricsName string - metrics name
			@param metricsHelpMessage string - metrics help message
			@param metricsLabels []string - labels to support
			@returns new `GaugeVec` handle
	*/
	InstallCustomGaugeVecMetrics(
		ctxt context.Context, metricsName string, metricsHelpMessage string, metricsLabels []string,
	) (*prometheus.GaugeVec, error)

	/*
		ExposeCollectionEndpoint expose the Prometheus metric collection endpoint

			@param outer *mux.Router - HTTP router to install endpoint on
			@param metricsPath string - metrics endpoint path relative to the router provided
			@param maxSupportedRequest int - max number of request the endpoint will support
	*/
	ExposeCollectionEndpoint(router *mux.Router, metricsPath string, maxSupportedRequest int)
}

MetricsCollector metrics collection support client

func GetNewMetricsCollector added in v0.6.0 

func GetNewMetricsCollector(
	logTags log.Fields,
	customLogModifiers []LogMetadataModifier,
) (MetricsCollector, error)

GetNewMetricsCollector get metrics collection support client 

@param logTags log.Fields - metadata fields to include in the logs
@param customLogModifiers []LogMetadataModifier - additional log metadata modifiers to use
@returns metric collection support client

type OAuthTokenManager added in v0.5.0 

type OAuthTokenManager interface {
	/*
		GetToken fetch the current valid OAuth token

		 @param ctxt context.Context - the execution context
		 @param timestamp time.Time - the current timestamp
		 @returns the token
	*/
	GetToken(ctxt context.Context, timestamp time.Time) (string, error)

	/*
		Stop stop any support background tasks which were started

		 @param ctxt context.Context - execution context
	*/
	Stop(ctxt context.Context) error
}

OAuthTokenManager Oauth token manager handles fetching and refreshing of OAuth tokens

func GetNewClientCredOAuthTokenManager added in v0.5.0 

func GetNewClientCredOAuthTokenManager(
	parentCtxt context.Context,
	httpClient *resty.Client,
	params ClientCredOAuthTokenManagerParam,
) (OAuthTokenManager, error)

GetNewClientCredOAuthTokenManager get client credential flow oauth token manager 

@param parentCtxt context.Context - parent context
@param httpClient *resty.Client - use this HTTP client to interact with the IDP
@param params ClientCredOAuthTokenManagerParam - configuration for the token manager
@returns new OAuthTokenManager instance

type PubSubClient added in v0.4.0 

type PubSubClient interface {
	/*
		UpdateLocalTopicCache sync local topic cache with existing topics in project

		 @param ctxt context.Context - execution context
	*/
	UpdateLocalTopicCache(ctxt context.Context) error

	/*
		UpdateLocalSubscriptionCache sync local subscription cache with existing subscriptions in project

		 @param ctxt context.Context - execution context
	*/
	UpdateLocalSubscriptionCache(ctxt context.Context) error

	/*
		CreateTopic create PubSub topic

		 @param ctxt context.Context - execution context
		 @param topic string - topic name
		 @param config *pubsub.TopicConfig - optionally, provide config on the topic
	*/
	CreateTopic(ctxt context.Context, topic string, config *pubsub.TopicConfig) error

	/*
		DeleteTopic delete PubSub topic

		 @param ctxt context.Context - execution context
		 @param topic string - topic name
	*/
	DeleteTopic(ctxt context.Context, topic string) error

	/*
		GetTopic get the topic config for a topic

		 @param ctxt context.Context - execution context
		 @param topic string - topic name
		 @returns if topic is known, the topic config
	*/
	GetTopic(ctxt context.Context, topic string) (pubsub.TopicConfig, error)

	/*
		UpdateTopic update the topic config

		 @param ctxt context.Context - execution context
		 @param topic string - topic name
		 @param newConfig pubsub.TopicConfigToUpdate - the new config
	*/
	UpdateTopic(ctxt context.Context, topic string, newConfig pubsub.TopicConfigToUpdate) error

	/*
		CreateSubscription create PubSub subscription to attach to topic

		 @param ctxt context.Context - execution context
		 @param targetTopic string - target topic
		 @param subscription string - subscription name
		 @param config pubsub.SubscriptionConfig - subscription config
	*/
	CreateSubscription(
		ctxt context.Context, targetTopic, subscription string, config pubsub.SubscriptionConfig,
	) error

	/*
		DeleteSubscription delete PubSub subscription

		 @param ctxt context.Context - execution context
		 @param subscription string - subscription name
	*/
	DeleteSubscription(ctxt context.Context, subscription string) error

	/*
		GetSubscription get the subscription config for a subscription

		 @param ctxt context.Context - execution context
		 @param subscription string - subscription name
		 @returns if subscription is known, the subscription config
	*/
	GetSubscription(ctxt context.Context, subscription string) (pubsub.SubscriptionConfig, error)

	/*
		UpdateSubscription update the subscription config

		 @param ctxt context.Context - execution context
		 @param subscription string - subscription name
		 @param newConfig pubsub.SubscriptionConfigToUpdate - the new config
	*/
	UpdateSubscription(
		ctxt context.Context, subscription string, newConfig pubsub.SubscriptionConfigToUpdate,
	) error

	/*
		Publish publish a message to a topic

		 @param ctxt context.Context - execution context
		 @param topic string - topic name
		 @param message []byte - message content
		 @param metadata map[string]string - message metadata, which will be sent using attributes
		 @param blocking bool - whether the call is blocking until publish is complete
		 @returns when non-blocking, the async result object to check on publish status
	*/
	Publish(
		ctxt context.Context, topic string, message []byte, metadata map[string]string, blocking bool,
	) (*pubsub.PublishResult, error)

	/*
		Subscribe subscribe for message on a subscription

		THIS CALL IS BLOCKING!!

		 @param ctxt context.Context - execution context
		 @param subscription string - subscription name
		 @param handler PubSubMessageHandler - RX message callback
	*/
	Subscribe(ctxt context.Context, subscription string, handler PubSubMessageHandler) error

	/*
		Close close and clean up the client

		 @param ctxt context.Context - execution context
	*/
	Close(ctxt context.Context) error
}

PubSubClient is a wrapper interface around the PubSub API with some ease-of-use features

func GetNewPubSubClientInstance added in v0.4.0 

func GetNewPubSubClientInstance(
	client *pubsub.Client, logTags log.Fields, metricsHelper PubSubMetricHelper,
) (PubSubClient, error)

GetNewPubSubClientInstance get PubSub wrapper client 

@param client *pubsub.Client - core PubSub client
@param logTags log.Fields - metadata fields to include in the logs
@param metricsHelper PubSubMetricHelper - metric collection helper agent
@returns new PubSubClient instance

type PubSubMessageHandler added in v0.4.0 

type PubSubMessageHandler func(
	ctxt context.Context, pubTimestamp time.Time, msg []byte, metadata map[string]string,
) error

PubSubMessageHandler callback to trigger when PubSub message received

type PubSubMetricHelper added in v0.6.0 

type PubSubMetricHelper interface {
	/*
		RecordPublish record PubSub publish message

			@param topic string - PubSub topic
			@param successful bool - whether the operation was successful
			@param payloadLen int64 - publish payload length
	*/
	RecordPublish(topic string, successful bool, payloadLen int64)

	/*
		RecordReceive record PubSub receive message

			@param topic string - PubSub topic
			@param successful bool - whether the operation was successful
			@param payloadLen int64 - receive payload length
	*/
	RecordReceive(topic string, successful bool, payloadLen int64)
}

PubSubMetricHelper PubSub publish and receive metric recording helper agent

type PubSubRequestResponseClientParam added in v0.4.0 

type PubSubRequestResponseClientParam struct {
	// TargetID the ID to target to send a request (or response) to this client
	TargetID string
	// Name client instance name
	Name string
	// PSClient base pubsub client
	PSClient PubSubClient
	// MsgRetentionTTL PubSub message TTL, after which the message is purged.
	MsgRetentionTTL time.Duration
	// LogTags metadata fields to include in the logs
	LogTags log.Fields
	// CustomLogModifiers additional log metadata modifiers to use
	CustomLogModifiers []LogMetadataModifier
	// SupportWorkerCount number of support workers to spawn to process incoming messages
	SupportWorkerCount int
	// TimeoutEnforceInt interval between request timeout checks
	TimeoutEnforceInt time.Duration
}

PubSubRequestResponseClientParam configuration parameters of PubSub based RequestResponseClient

type RRInboundRequestHandler added in v0.5.3 

type RRInboundRequestHandler func(
	ctxt context.Context, request interface{}, origMsg ReqRespMessage,
) (interface{}, error)

RRInboundRequestHandler callback function to process a specific inbound request

type RRMessageParser added in v0.5.3 

type RRMessageParser func(rawMsg []byte) (interface{}, error)

RRMessageParser callback function to parse request-response payload into a specific data type

type ReqRespMessage added in v0.4.0 

type ReqRespMessage struct {
	// RequestID request ID associated with this message
	RequestID string `json:"request" validate:"required"`
	// SenderID message sender ID
	SenderID string `json:"sender" validate:"required"`
	// TargetID message target ID
	TargetID string `json:"target" validate:"required"`
	// IsRequest whether the message is a request message
	IsRequest bool `json:"is_request"`
	// Timestamp message timestamp
	Timestamp time.Time `json:"timestamp"`
	// Metadata message metadata
	Metadata map[string]string `json:"meta,omitempty"`
	// Payload message payload
	Payload []byte `json:"payload,omitempty"`
}

ReqRespMessage message structure passing through a request-response system

type ReqRespMessageHandler added in v0.4.0 

type ReqRespMessageHandler func(ctxt context.Context, msg ReqRespMessage) error

ReqRespMessageHandler callback called when request-response message is available for processing

type ReqRespTimeoutHandler added in v0.4.0 

type ReqRespTimeoutHandler func(ctxt context.Context) error

ReqRespTimeoutHandler callback called when request timed out waiting for all responses

type RequestCallParam added in v0.4.0 

type RequestCallParam struct {
	// RespHandler response message handler callback
	RespHandler ReqRespMessageHandler
	// ExpectedResponsesCount the expected number of responses to receive. Once this many responses
	// are received, the request is considered to be complete.
	ExpectedResponsesCount int
	// Blocking whether the request call is blocking
	Blocking bool
	// Timeout the request timeout if it has not received all responses after this duration
	Timeout time.Duration
	// TimeoutHandler request timeout handler callback
	// TODO FIXME: implement request timeout handling
	TimeoutHandler ReqRespTimeoutHandler
}

RequestCallParam contains the parameters of a request

type RequestResponseClient added in v0.4.0 

type RequestResponseClient interface {
	/*
		SetInboundRequestHandler set the inbound request handler

		 @param ctxt context.Context - execution context
		 @param handler ReqRespMessageHandler - the handler to use
	*/
	SetInboundRequestHandler(ctxt context.Context, handler ReqRespMessageHandler) error

	/*
		Request make a new request

		 @param ctxt context.Context - execution context
		 @param targetID string - target ID this request is destined for
		 @param message []byte - request message payload
		 @param metadata map[string]string - request metadata
		 @param callParam RequestCallParam - request call parameters
		 @return request ID
	*/
	Request(
		ctxt context.Context,
		targetID string,
		message []byte,
		metadata map[string]string,
		callParam RequestCallParam,
	) (string, error)

	/*
		Respond respond to an inbound request

		 @param ctxt context.Context - execution context
		 @param originalReq ReqRespMessage - original request
		 @param message []byte - response message payload
		 @param metadata map[string]string - request metadata
		 @param blocking bool - whether the call is blocking
	*/
	Respond(
		ctxt context.Context,
		originalReq ReqRespMessage,
		message []byte,
		metadata map[string]string,
		blocking bool,
	) error

	/*
		Stop stop any support background tasks which were started

		 @param ctxt context.Context - execution context
	*/
	Stop(ctxt context.Context) error
}

RequestResponseClient is a request-response client built on provided messaging transport

Each client instance will respond to requests for a single request target ID

func GetNewPubSubRequestResponseClientInstance added in v0.4.0 

func GetNewPubSubRequestResponseClientInstance(
	parentCtxt context.Context,
	params PubSubRequestResponseClientParam,
) (RequestResponseClient, error)

GetNewPubSubRequestResponseClientInstance get PubSub based RequestResponseClient 

@param parentCtxt context.Context - parent context
@param params PubSubRequestResponseClientParam - client config parameters
@return new RequestResponseClient instance

type RequestResponseDriver added in v0.5.3 

type RequestResponseDriver struct {
	Component
	Client        RequestResponseClient
	PayloadParser RRMessageParser
	// contains filtered or unexported fields
}

RequestResponseDriver helper request-response driver class to simplify RR client usage

func (*RequestResponseDriver) InstallHandler added in v0.5.3 

func (d *RequestResponseDriver) InstallHandler(
	requestType reflect.Type, handler RRInboundRequestHandler,
)

InstallHandler install a handler for an inbound request 

@param requestType reflect.Type - request message type
@param handler InboundRequestHandler - request handler callback

func (*RequestResponseDriver) MakeRequest added in v0.5.3 

func (d *RequestResponseDriver) MakeRequest(
	ctxt context.Context,
	requestInstanceName string,
	targetID string,
	requestMsg []byte,
	requestMeta map[string]string,
	callParam RequestCallParam,
) ([]interface{}, error)

MakeRequest wrapper function to marking an outbound request 

@param ctxt context.Context - execution context
@param requestInstanceName string - descriptive name for this request to identify it in logs
@param targetID string - request target ID
@param requestMsg []byte - request payload
@param requestMeta map[string]string - request's associated metadata
@param callParam RequestCallParam - request call parameters
@returns response payload or payloads if multiple responses expected

func (*RequestResponseDriver) ProcessInboundRequest added in v0.5.3 

func (d *RequestResponseDriver) ProcessInboundRequest(
	ctxt context.Context, msg ReqRespMessage,
) error

ProcessInboundRequest process inbound request 

@param ctxt context.Context - execution context
@param msg ReqRespMessage - raw request message

type RestAPIBaseResponse 

type RestAPIBaseResponse struct {
	// Success indicates whether the request was successful
	Success bool `json:"success" validate:"required"`
	// RequestID gives the request ID to match against logs
	RequestID string `json:"request_id" validate:"required"`
	// Error are details in case of errors
	Error *ErrorDetail `json:"error,omitempty"`
}

RestAPIBaseResponse standard REST API response

type RestAPIHandler 

type RestAPIHandler struct {
	Component
	// CallRequestIDHeaderField the HTTP header containing the request ID provided by the caller
	CallRequestIDHeaderField *string
	// DoNotLogHeaders marks the set of HTTP headers to not log
	DoNotLogHeaders map[string]bool
	// LogLevel configure the request logging level
	LogLevel HTTPRequestLogLevel
	// MetricsHelper HTTP request metric collection agent
	MetricsHelper HTTPRequestMetricHelper
}

RestAPIHandler base REST API handler

func (RestAPIHandler) GetStdRESTErrorMsg 

func (h RestAPIHandler) GetStdRESTErrorMsg(
	ctxt context.Context, respCode int, errMsg string, errDetail string,
) RestAPIBaseResponse

GetStdRESTErrorMsg defines a standard error message 

@param ctxt context.Context - a request context
@param respCode int - the request response code
@param errMsg string - the error message
@param errDetail string - the details on the error
@return the standard REST response

func (RestAPIHandler) GetStdRESTSuccessMsg 

func (h RestAPIHandler) GetStdRESTSuccessMsg(ctxt context.Context) RestAPIBaseResponse

GetStdRESTSuccessMsg defines a standard success message 

@param ctxt context.Context - a request context
@return the standard REST response

func (RestAPIHandler) LoggingMiddleware 

func (h RestAPIHandler) LoggingMiddleware(next http.HandlerFunc) http.HandlerFunc

LoggingMiddleware is a support middleware to be used with Mux to perform request logging 

@param next http.HandlerFunc - the core request handler function
@return middleware http.HandlerFunc

func (RestAPIHandler) ReadRequestIDFromContext added in v0.3.2 

func (h RestAPIHandler) ReadRequestIDFromContext(ctxt context.Context) string

ReadRequestIDFromContext reads the request ID from the request context if available 

@param ctxt context.Context - a request context
@return if available, the request ID

func (RestAPIHandler) WriteRESTResponse 

func (h RestAPIHandler) WriteRESTResponse(
	w http.ResponseWriter, respCode int, resp interface{}, headers map[string]string,
) error

WriteRESTResponse helper function to write out the REST API response 

@param w http.ResponseWriter - response writer
@param respCode int - the response code
@param resp interface{} - the response body
@param headers map[string]string - the response header
@return whether write succeeded

type RestRequestParam 

type RestRequestParam struct {
	// ID is the request ID
	ID string `json:"id"`
	// Host is the request host
	Host string `json:"host" validate:"required,fqdn"`
	// URI is the request URI
	URI string `json:"uri" validate:"required,uri"`
	// Method is the request method
	Method string `json:"method" validate:"required,oneof=GET HEAD PUT POST PATCH DELETE OPTIONS"`
	// Referer is the request referer string
	Referer string `json:"referer"`
	// RemoteAddr is the request
	RemoteAddr string `json:"remote_address"`
	// Proto is the request HTTP proto string
	Proto string `json:"http_proto"`
	// ProtoMajor is the request HTTP proto major version
	ProtoMajor int `json:"http_version_major"`
	// ProtoMinor is the request HTTP proto minor version
	ProtoMinor int `json:"http_version_minor"`
	// RequestHeaders additional request headers
	RequestHeaders http.Header
	// Timestamp is when the request is first received
	Timestamp time.Time
}

RestRequestParam is a helper object for logging a request's parameters into its context

type RestRequestParamKey 

type RestRequestParamKey struct{}

RestRequestParamKey associated key for RESTRequestParam when storing in request context

type Sequencer 

type Sequencer interface {
	/*
		NextValue returns the next value in the sequence
	*/
	NextValue() float64
}

Sequencer is a helper interface for returning a sequence of numbers

func GetExponentialSeq 

func GetExponentialSeq(initial float64, growthRate float64) (Sequencer, error)

GetExponentialSeq define an exponential sequencer 

@param initial float64 - initial value
@param growthRate float64 - EXP change rate
@return an Sequencer instance

type TaskProcessor 

type TaskProcessor interface {
	/*
		Submit submits a new task parameter to be processed by a handler

		 @param ctx context.Context - calling context
		 @param newTaskParam interface{} - task-parameter
		 @return whether successful
	*/
	Submit(ctx context.Context, newTaskParam interface{}) error

	/*
		SetTaskExecutionMap update the mapping between task-parameter object and its associated
		handler function.

		The task-parameter object contains information need to execute a particular task. When
		a user wants to execute a task, the user is submitting a task-parameter object via Submit.
		The module finds the associated handler function and calls it with the task-parameter object.

		 @param newMap map[reflect.Type]TaskHandler - map of task handlers to various task-parameter
		 object types
		 @return whether successful
	*/
	SetTaskExecutionMap(newMap map[reflect.Type]TaskProcessorSupportHandler) error

	/*
		AddToTaskExecutionMap add new (task-parameter, handler function) mapping to the existing set.

		 @param parameterType reflect.Type - task-parameter object type
		 @param handler TaskHandler - task handler
		 @return whether successful
	*/
	AddToTaskExecutionMap(parameterType reflect.Type, handler TaskProcessorSupportHandler) error

	/*
		StartEventLoop starts the daemon thread for processing the submitted task-parameters

		 @param wg *sync.WaitGroup - wait group
		 @return whether successful
	*/
	StartEventLoop(wg *sync.WaitGroup) error

	/*
		StopEventLoop stops the daemon thread

		 @return whether successful
	*/
	StopEventLoop() error
}

TaskProcessor implements an event loop where tasks are processed by a daemon thread

func GetNewTaskDemuxProcessorInstance 

func GetNewTaskDemuxProcessorInstance(
	ctxt context.Context,
	instanceName string,
	taskBufferLen int,
	workerNum int,
	logTags log.Fields,
) (TaskProcessor, error)

GetNewTaskDemuxProcessorInstance get multi-threaded implementation of TaskProcessor 

@param ctxt context.Context - parent context
@param instanceName string - instance name
@param taskBufferLen int - number of task-parameters to buffer
@param workerNum int - number of supporting worker threads
@param logTags log.Fields - metadata fields to include in the logs
@return new TaskProcessor instance

func GetNewTaskProcessorInstance 

func GetNewTaskProcessorInstance(
	ctxt context.Context, instanceName string, taskBufferLen int, logTags log.Fields,
) (TaskProcessor, error)

GetNewTaskProcessorInstance get single threaded implementation of TaskProcessor 

@param ctxt context.Context - parent context
@param instanceName string - instance name
@param taskBufferLen int - number of task-parameters to buffer
@param logTags log.Fields - metadata fields to include in the logs
@return new TaskProcessor instance

type TaskProcessorSupportHandler 

type TaskProcessorSupportHandler func(taskParam interface{}) error

TaskProcessorSupportHandler is the function signature of callback used to process an user task

type TimeoutHandler 

type TimeoutHandler func() error

TimeoutHandler callback function signature called timer timeout

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