sonntam
commented
2 years ago Could you elaborate on what you are trying to achieve or post a full minimal example?
The way you define your guard "myEvent" in the config object is fine (apart from one apparent missing "=" in the condition --> event.payload == "incoming_payload_topic").
See the following example:
As node-red import:
[{"id":"11e76c6e13b9cecd","type":"smxstate","z":"923927cd.3b9538","name":"","xstateDefinition":"// Available variables/objects/functions:\n// xstate\n// - .Machine\n// - .interpret\n// - .assign\n// - .send\n// - .sendParent\n// - .spawn\n// - .raise\n// - .actions\n//\n// Common\n// - setInterval, setTimeout, clearInterval, clearTimeout\n// - node.send, node.warn, node.log, node.error\n// - context.get, context.set\n// - flow.get, flow.set\n// - env.get\n// - util\n\n// @ts-ignore\nconst { assign } = xstate;\n\n// First define names guards, actions, ...\n\n/**\n * Guards\n */\n\n\n/**\n * Actions\n */\n\n\n/**\n * Activities\n */\n\n\n/***************************\n * Main machine definition * \n ***************************/\nreturn {\n machine: {\n context: {\n\n },\n initial: 'state_one',\n states: {\n state_one: {\n on: [\n { PAUSE: 'state_two' },\n { event: \"*\", target: 'state_two', cond: \"myEvent\" }\n ]\n },\n state_two: {\n on: {\n RESUME: 'state_one'\n }\n }\n }\n },\n // Configuration containing guards, actions, activities, ...\n // see above\n config: {\n guards: {\n myEvent: (_, event) => {\n node.warn(event);\n return event.payload == \"incoming_payload_topic\";\n }\n },\n actions: {},\n activities: {}\n },\n // Define listeners (can be an array of functions)\n // Functions get called on every state/context update\n listeners: (data) => {\n \n }\n};","noerr":0,"x":530,"y":700,"wires":[[],[]]},{"id":"279de70ccaef7437","type":"inject","z":"923927cd.3b9538","name":"","props":[{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"PAUSE","x":270,"y":700,"wires":[["11e76c6e13b9cecd"]]},{"id":"666edeac833aecfd","type":"inject","z":"923927cd.3b9538","name":"","props":[{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"RESUME","x":280,"y":740,"wires":[["11e76c6e13b9cecd"]]},{"id":"abf6f61dd9263c7a","type":"inject","z":"923927cd.3b9538","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"},{"p":"type","v":"what","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"anything","payload":"incoming_payload_topic","payloadType":"str","x":350,"y":800,"wires":[["11e76c6e13b9cecd"]]}]The source of the statechart:
// Available variables/objects/functions:
// xstate
// - .Machine
// - .interpret
// - .assign
// - .send
// - .sendParent
// - .spawn
// - .raise
// - .actions
//
// Common
// - setInterval, setTimeout, clearInterval, clearTimeout
// - node.send, node.warn, node.log, node.error
// - context.get, context.set
// - flow.get, flow.set
// - env.get
// - util
// @ts-ignore
const { assign } = xstate;
// First define names guards, actions, ...
/**
* Guards
*/
/**
* Actions
*/
/**
* Activities
*/
/***************************
* Main machine definition *
***************************/
return {
machine: {
context: {
},
initial: 'state_one',
states: {
state_one: {
on: [
{ PAUSE: 'state_two' },
{ event: "*", target: 'state_two', cond: "myEvent" }
]
},
state_two: {
on: {
RESUME: 'state_one'
}
}
}
},
// Configuration containing guards, actions, activities, ...
// see above
config: {
guards: {
myEvent: (_, event) => {
node.warn(event);
return event.payload == "incoming_payload_topic";
}
},
actions: {},
activities: {}
},
// Define listeners (can be an array of functions)
// Functions get called on every state/context update
listeners: (data) => {
}
};Does that help?
vacquah
Hello - Just getting into trying out this module. I am stuck on trying to get a guard condition to work. The below setup doesn't work. Could use some help to tweak this. thx.
In the return state, I have the condition setup like this:
state_one: {target: 'system_off', cond: "myEvent"}And
edit; Does xstate support the cond: setup like above?