Json Call to remote instance

DecK · 2012-04-04 18:11

All
I am trying to make a Json call to an instance of XBMC running on another machine on my network. Below is the code I am using. When I run this I get the following error. Any input would be appreciated.

Error Message
{"error":{"code":-32700,"message":"Parse error."},"id":null,"jsonrpc":"2.0"}

PHP Code:

import urllib
import urllib2

host = '192.168.0.50'
port = '8080'
url = 'http://%s:%s/jsonrpc' %(host, port) 
user_agent = 'Mozilla/4.0 (compatible; MSIE 5.5; Windows NT)'
values = {"jsonrpc": "2.0", "method": "JSONRPC.Introspect", "id": "1"}
headers = { 'User-Agent' : user_agent }

data = urllib.urlencode(values)
req = urllib2.Request(url, data, headers)
response = urllib2.urlopen(req)
the_page = response.read()

file = "C:\\test\\test_output.txt"
f = open(file,"w")
f.write(the_page)
f.close 

Bstrdsmkr · 2012-04-04 21:01

Looks like it didn't receive a valid JSON string. I think JSONRPC.Introspect requires a filter parameter. Try this:

{ "jsonrpc": "2.0", "method": "JSONRPC.Introspect", "params": { "filter": { "id": "AudioLibrary.GetSongs", "type": "method" } }, "id": 1 }

DecK · 2012-04-04 22:13

That gives me the exact same error message.
In order to check the validity of the JSON strings, I ran both your and mine in an addon using xbmc.executeJSONRPC and both worked successfully.

So it looks like the issue is somewhere else in the code.

Bstrdsmkr · 2012-04-05 01:20

Knew I should have waited and tested that lol

try changing headers to:

headers = {"Content-Type":"application/json"}

That should only matter in pre-Frodo, but could be it.

DecK · 2012-04-05 02:03

Afraid not. :-(
Still getting the same error.

jbel · 2012-04-05 04:06

I'm not too familiar with using the JSON API, however in your example code you are not POSTing JSON. You are incorrectly calling urlencode which creates a query string. You want to use json.dumps(values) for your data variable.

paddycarey · 2012-04-05 05:04

jbel's got it, this works:

Code:

import json

import urllib2

host = 'someip'

port = '8080'

url = 'http://%s:%s/jsonrpc' %(host, port) 

user_agent = 'Mozilla/4.0 (compatible; MSIE 5.5; Windows NT)'

values = {"jsonrpc": "2.0", "method": "JSONRPC.Introspect", "id": "1"}

headers = { 'User-Agent' : user_agent }

data = json.dumps(values)

req = urllib2.Request(url, data, headers)

response = urllib2.urlopen(req)

the_page = response.read()

file = "test_output.txt"

f = open(file,"w")

f.write(the_page)

f.close

Bstrdsmkr · 2012-04-05 05:37

right, duh. I think you can also drop the user-agent as I'm pretty sure xbmc just ignores it

DecK · 2012-04-05 17:01

Thanks to everyone, It is working now.
I've wrapped it into a function. Any suggestions for improved would still be appreciated.

PHP Code:

import json
import urllib2

def getJsonRemote(host,port,method,params=None):
    url = 'http://%s:%s/jsonrpc' %(host, port) 
    values ={}
    values["jsonrpc"] = "2.0"
    values["method"] = method
    if params is not None:
        values["params"] = params
    values["id"] = "1"
    headers = {"Content-Type":"application/json"}

    data = json.dumps(values)
    req = urllib2.Request(url, data, headers)
    response = urllib2.urlopen(req)
    return response.read() 

Bstrdsmkr · 2012-04-05 17:46

You might change it to

response = urllib2.urlopen(req)
response = response.read()
return json.loads(response)

That way you get back actual objects instead of a string. I doubt you'll have a use for the string besides converting it to objects

Bstrdsmkr Fan Posts: 644 Joined: Oct 2010 Reputation: 12	2012-04-04 21:01 Post: #2 Looks like it didn't receive a valid JSON string. I think JSONRPC.Introspect requires a filter parameter. Try this: { "jsonrpc": "2.0", "method": "JSONRPC.Introspect", "params": { "filter": { "id": "AudioLibrary.GetSongs", "type": "method" } }, "id": 1 }
	find quote

DecK Senior Member Posts: 134 Joined: Nov 2008 Reputation: 4 Location: Round Rock, TX	2012-04-04 22:13 Post: #3 That gives me the exact same error message. In order to check the validity of the JSON strings, I ran both your and mine in an addon using xbmc.executeJSONRPC and both worked successfully. So it looks like the issue is somewhere else in the code.
	find quote

Bstrdsmkr Fan Posts: 644 Joined: Oct 2010 Reputation: 12	2012-04-05 01:20 Post: #4 Knew I should have waited and tested that lol try changing headers to: headers = {"Content-Type":"application/json"} That should only matter in pre-Frodo, but could be it.
	find quote

DecK Senior Member Posts: 134 Joined: Nov 2008 Reputation: 4 Location: Round Rock, TX	2012-04-05 02:03 Post: #5 Afraid not. :-( Still getting the same error.
	find quote

jbel Senior Member Posts: 109 Joined: Apr 2009 Reputation: 5 Location: nyc	2012-04-05 04:06 Post: #6 I'm not too familiar with using the JSON API, however in your example code you are not POSTing JSON. You are incorrectly calling urlencode which creates a query string. You want to use json.dumps(values) for your data variable. XBMC Addon Browser Plugins: Aljazeera, Academic Earth, Classic Cinema, Khan Academy
	find quote

Bstrdsmkr Fan Posts: 644 Joined: Oct 2010 Reputation: 12	2012-04-05 05:37 Post: #8 right, duh. I think you can also drop the user-agent as I'm pretty sure xbmc just ignores it
	find quote

Bstrdsmkr Fan Posts: 644 Joined: Oct 2010 Reputation: 12	2012-04-05 17:46 Post: #10 You might change it to response = urllib2.urlopen(req) response = response.read() return json.loads(response) That way you get back actual objects instead of a string. I doubt you'll have a use for the string besides converting it to objects
	find quote