Hi All,
I got into a spot of bother with message timing and fatal lock up so I created this function node to pause, skip, play next, play last, dump and run any message with a topic.
Messages are saved to context variable queues and can be inspected at your leisure.
I hope you find it as useful as I have.
P.S. Could anyone please explain or show when 'node.done()' should be used ?
I have read the docs but it is still not clear to me when it should be used. In particular the case where msg loops perform count up/down functions.
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msg.topic;\n context.set(node.name, q);\n while (q.que.length>0){\n q.last = q.que.shift();\n node.send(q.last);\n context.set(node.name, q);\n }\n showStatus(\"green\");\n break;\n\n default:\n // msg\n if (q.status === \"_DUMP_\") {\n q.last = msg;\n showStatus(\"yellow\");\n break;\n }\n if (q.status === \"_PAUSE_\"){\n q.last = msg;\n if (q.que.length > MAX_Q_LEN) {\n showStatus(\"red\");\n break;\n }\n q.que.push(msg);\n showStatus(\"yellow\");\n break;\n }\n while (q.que.length>0){\n q.last = q.que.shift();\n node.send(q.last);\n context.set(node.name, q);\n }\n q.last = msg;\n showStatus(\"green\");\n context.set(node.name,q);\n node.done();\n return msg;\n}\ncontext.set(node.name,q);\nnode.done();\nreturn;\n\nfunction showStatus(colour){\n node.status({fill:colour,shape:\"ring\",text:topics(colour)});\n}\nfunction topics(colour){\n let s = q.status+(colour===\"red\" ? \"Overflow\": \"\")+\"(\"+(Object.keys(q.last).length>0 ? q.last.topic : \"\")+\")\";\n for (let i=0;i<q.que.length;i++) {\n s = s + q.que[i].topic + ((i===q.que.length-1) ? \"\":\",\");\n }\n return s;\n}","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":515,"y":220,"wires":[["db81c15965a84b21"]],"l":false},{"id":"3e018a9f22cef19e","type":"function","z":"a68c78a260d393d4","name":"in1-history","func":"const MAX_Q_LEN = 100;\n\nvar q = context.get(node.name) || {status: \"_PAUSE_\", last: {}, que:[]};\ncontext.set(node.name, q);\n\nswitch(msg.topic) {\n case \"_LAST_\":\n if (Object.keys(q.last) === 0) return;\n return q.last;\n\n case \"_DUMP_\":\n q.status = msg.topic;\n context.set(node.name, q);\n while (q.que.length>0){\n q.last = q.que.shift();\n }\n showStatus(\"yellow\");\n break;\n\n case \"_NEXT_\":\n if (q.status !== \"_PAUSE_\" || q.que.length === 0) return;\n node.send(q.que.shift());\n showStatus(\"yellow\");\n break;\n \n case \"_SKIP_\":\n if (q.status !== \"_PAUSE_\" || q.que.length === 0) return;\n q.que.shift();\n showStatus(\"yellow\");\n 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MAX_Q_LEN = 100;\n\nvar q = context.get(node.name) || {status: \"_PAUSE_\", last: {}, que:[]};\ncontext.set(node.name, q);\n\nswitch(msg.topic) {\n case \"_LAST_\":\n if (Object.keys(q.last) === 0) return;\n return q.last;\n\n case \"_DUMP_\":\n q.status = msg.topic;\n context.set(node.name, q);\n while (q.que.length>0){\n q.last = q.que.shift();\n }\n showStatus(\"yellow\");\n break;\n\n case \"_NEXT_\":\n if (q.status !== \"_PAUSE_\" || q.que.length === 0) return;\n node.send(q.que.shift());\n showStatus(\"yellow\");\n break;\n \n case \"_SKIP_\":\n if (q.status !== \"_PAUSE_\" || q.que.length === 0) return;\n q.que.shift();\n showStatus(\"yellow\");\n break;\n\n case \"_PAUSE_\":\n q.status = msg.topic;\n context.set(node.name, q);\n showStatus(\"yellow\");\n break;\n\n case \"_RUN_\":\n q.status = msg.topic;\n context.set(node.name, q);\n while (q.que.length>0){\n q.last = q.que.shift();\n node.send(q.last);\n context.set(node.name, q);\n }\n showStatus(\"green\");\n break;\n\n 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