Using Curl (HTTP request) to get some data from other application (DomotiGa).

[Alco van Neck]

Hi,

I'm starting to use Node-Red and already made some fancy flows from my local EmonCMS Server (Energy monitor) to Twitter by using JSON strings.

Now I have an other great application, DomotiGa and I can get data with CURL from this. Like this command line example:

curl -X POST -d '{"jsonrpc": "2.0", "method": "astro.get", "id": 1}' -H "Content-Type: application/json" -H "Accept: application/json"   http://localhost:9090

It returns some local astro and location data, nicely at an JSON string.
But now I want to use it in Node-Red.

I made a simplistic flow with 3 objects, a time stamp, a http IN and a debugnode : flow export >

[{"id":"efad9064.10527","type":"http request","name":"test","method":"POST","ret":"obj","url":"curl -d '{\"jsonrpc\": \"2.0\", \"method\": \"astro.get\", \"id\": 1}' -H \"Content-Type: application/json\" -H \"Accept: application/json\"   http://localhost:9090","x":318,"y":238,"z":"216dbbe9.de9244","wires":[["7948c48.f86b73c"]]}]

I can't get it working ?  I get this ENOTFOUND error back. (node-red is on one server with the DomotiGa application..)

Error: getaddrinfo ENOTFOUND : http://curl -d '{"jsonrpc": "2.0", "method": "astro.get", "id": 1}' -H "Content-Type: application/json" -H "Accept: application/json" http://192.168.1.115:9090

something wrong in the command box? I tried several things (removing, the -X and POST in the string..) but no luck...

Do you know whats wrong?

Thanks!

[Nicholas O'Leary]

HI,

the 'url' box of the HTTP Request node isn't a 'command box' for you to specify a random command for the node to run (we have the Exec node for that sort of thing) - it is where you provide the url you want to send a request to.

Here's a flow that I think does what you want:

[{"id":"9adcce24.65233","type":"inject","name":"","topic":"","payload":"","payloadType":"date","repeat":"","crontab":"","once":false,"x":126,"y":71,"z":"6af0c717.950f38","wires":[["e1b33f63.1e4cc"]]},{"id":"e1b33f63.1e4cc","type":"function","name":"","func":"msg.payload = {\n    \"jsonrpc\": \"2.0\",\n    \"method\":\n    \"astro.get\",\n    \"id\": 1\n};\n\nmsg.headers = {\n    Accept: \"application/json\"\n}\n\nreturn msg;","outputs":1,"noerr":0,"x":271,"y":89,"z":"6af0c717.950f38","wires":[["178423e4.e87bdc"]]},{"id":"178423e4.e87bdc","type":"http request","name":"","method":"POST","ret":"obj","url":"http://192.168.1.115:9090","x":446,"y":95,"z":"6af0c717.950f38","wires":[["70d01c46.8f2fe4"]]},{"id":"70d01c46.8f2fe4","type":"debug","name":"","active":true,"console":"false","complete":"false","x":643,"y":85,"z":"6af0c717.950f38","wires":[]}]

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[Alco van Neck]

Nicely done,

Your function works out of the box, I'm really happy because DomotiGa can put almost every thing to a JSON-RPC string and now I'm able to get it to Node-Red and do some analytics and logics with it.
Thanks!

msg.payload = {

    "jsonrpc": "2.0",
    "method":
    "astro.get",
    "id": 1

};

msg.headers = {
    Accept: "application/json"
}

return msg;

Op donderdag 9 juli 2015 12:07:50 UTC+2 schreef Nicholas O'Leary: