RuleContextOption

Configuration items for the execution of a rule engine instance. Usage: ruleEngine.OnMsg(msg, ...RuleContextOption), example:

ruleEngine.OnMsg(msg, types.WithOnEnd(func(ctx types.RuleContext, msg types.RuleMsg, err error) {
    // do something
}), types.WWithOnRuleChainCompleted(func(ctx RuleContext, snapshot RuleChainRunSnapshot){
    // do something
}))

The following options are available:

WithOnEnd

Callback for when a rule chain branch execution ends. If the rule chain has multiple endpoints, the callback function will be executed multiple times

types.WithOnEnd(func(ctx types.RuleContext, msg types.RuleMsg, err error) {
	
}

WithContext

Context

• Used for sharing data or semaphores between different component instances
• Used for timeout cancellation

types.WithContext(c context.Context)

WithOnAllNodeCompleted

Callback function when all branches of the rule chain have completed execution.

• Called only once

types.WithOnAllNodeCompleted(func(){
	
})

WithOnRuleChainCompleted

Callback function when the rule chain execution is completed, and collects the runtime logs of each node.

types.WithOnRuleChainCompleted(func(ctx RuleContext, snapshot RuleChainRunSnapshot){
	
})

• RuleChainRunSnapshot:

Field	Type	Description	Default Value
RuleChain	RuleChain	Rule chain snapshot: Reference	None
id	string	Message ID	None
startTs	int64	Rule chain start execution time	None
endTs	int64	Rule chain end execution time	None
logs	[]RuleNodeRunLog	Execution log of each node	None
additionalInfo	object	Additional information	None

• RuleNodeRunLog:

Field	Type	Description	Default Value
nodeId	string	Node ID	None
inMsg	RuleMsg	Input message: Reference	None
outMsg	RuleMsg	Output message: Reference	None
relationType	string	Connection type with the next node	None
err	string	Error information	None
logItems	[]string	Other logs during execution	None
startTs	int64	Rule chain start execution time	None
endTs	int64	Rule chain end execution time	None

WithOnNodeCompleted

Callback function when a node is completed, and collects the node's runtime log.

types.WithOnNodeCompleted(func(ctx RuleContext, nodeRunLog RuleNodeRunLog){
	
})

WithOnNodeDebug

Node debug log callback function. Same as config.OnDebug. It is called in real-time asynchronously and will only trigger if the node or rule chain is configured with debugMode enabled

types.WithOnNodeDebug(func(ruleChainId string, flowType string, nodeId string, msg RuleMsg, relationType string, err error)){

})

TIP

WithOnNodeDebug callback function contains custom logic that is triggered asynchronously, and the execution order cannot be guaranteed. It may be executed after WithOnAllNodeCompleted and WithOnRuleChainCompleted.

WithStartNode

Set the first start execution node of the rule chain.

types.WithStartNode(nodeId string) 

WithTellNext

Set to search for the next or multiple execution nodes by specifying the node ID. Used to restore the execution link of the rule chain.

types.WithTellNext(fromNodeId string, relationTypes ...string)