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  1. How to get pylons talking JSONRPC

http://www.machine-envy.com/blog/2006/12/10/howto-pyjamas-pylons-json/

Comment by cornelis.bos, Apr 15, 2009

With the current pyjamas/pylons versions, the directions in the above link needed some adjustments for me. Installing pyjamas¶

mkdir pyjamas cd pyjamas wget http://pyjamas.googlecode.com/files/pyjamas-0.5p1.tgz tar xzf pyjamas-0.5p1.tgz cd pyjamas-0.5p1 python bootstrap.py cd examples ./buildall.sh

cd ../../..

Installing pylons¶

wget http://www.pylonshq.com/download/0.9.7/go-pylons.py python go-pylons.py --no-site-packages pylons

Creating echo project¶ Activate pylons environment¶

cd pylons . ./bin/acivate

Create project directories¶

paster create --template pylons echo

Copy jsonrpc example¶

cd echo/echo/public cp -pr ../../../../pyjamas/pyjamas-0.5p1/examples/jsonrpc/* .

Modify JSONRPCExample.py¶

class EchoServicePython(JSONProxy): def __init__(self): JSONProxy.__init__(self, "/echoservice/json", ["echo", "reverse", "uppercase", "lowercase"])

Build output¶

../../../../pyjamas/pyjamas-0.5p1/bin/pyjsbuild JSONRPCExample.py

Create controler¶

cd ../.. paster controller echoservice

Modify echo/controllers/echoservice.py¶

from echo.lib.base import BaseController, render

  1. Start addition from pylons.decorators import jsonify import simplejson import urllib
  2. End addition

log = logging.getLogger(__name__)

...

return 'Hello World'

  1. Start addition @jsonify def json(self): body = urllib.unquote(request.body[:-1]) json = simplejson.loads(body) data = json['params'][0] method = json['method'] if method == 'reverse': data = data[::-1] if method == 'uppercase': data = data.upper() if method == 'lowercase': data = data.lower() return dict(result=data)
  2. End addition

This comment is not visible to normal users. Undelete comment Comment by dr.mark.lui, Aug 30, 2009

fgfg This comment is not visible to normal users. Undelete comment Comment by robertoedwins, Nov 29, 2009

With pylons-0.9.7 and pyjamas-0.7pre1:

Write: body = urllib.unquote(request.body:-1?) Instead of: body = urllib.unquote(request.body)

Write: jsonu'params'?0? Instead of: json'params'?0?

Write: jsonu'method'? Instead of: json'method'? This comment is not visible to normal users. Undelete comment Comment by robertoedwins, Nov 29, 2009

inline code This comment is not visible to normal users. Undelete comment Comment by robertoedwins, Nov 29, 2009

inline code This comment is not visible to normal users. Undelete comment Comment by robertoedwins, Nov 29, 2009

verbatim code block

This comment is not visible to normal users. Undelete comment Comment by robertoedwins, Nov 29, 2009

With pyjamas-0.7pre1 and pylons-0.9.7:

Change: json = simplejson.loads(body[:-1]) With: json = simplejson.loads(body)

Change: json[u'params'][0] With: json['params'][0]

Change: json['method'][0] With: json[u'method'][0]

Delete comment Comment by robertoedwins, Nov 29, 2009

With pyjamas-0.7pre1 and pylons-0.9.7:

Change: json = simplejson.loads(body[:-1]) With: json = simplejson.loads(body)

Change: json['params'][0] With: json[u'params'][0]

Change: json['method'] With: json[u'method']

This comment is not visible to normal users. Undelete comment Comment by [email protected], Jun 06, 2010

This example (also with adjustments) do not work for me.

Pylons version 0.9.7 Pyjamas is from Debian testing: 0.7+pre2-3

JSONRPCExample give a HTTP 500 error to me.

Here is what I get from Pylons:

File '<string>', line 2 in json File '/home/martin/pyenv/lib/python2.6/site-packages/Pylons-0.9.7-py2.6.egg/pylons/decorators/init.py', line 36 in jsonify

data = func(args, kwargs)

File '/home/martin/pyenv/lib/echo/echo/controllers/echoservice.py', line 28 in json

json = simplejson.loads(body)

File 'build/bdist.linux-x86_64/egg/simplejson/init.py', line 305 in loads File 'build/bdist.linux-x86_64/egg/simplejson/decoder.py', line 329 in decode File 'build/bdist.linux-x86_64/egg/simplejson/decoder.py', line 345 in raw_decode ValueError?: Expecting object: line 1 column 146 (char 146)

LiveHTTP Headers give:

http://localhost:5000/echoservice/json

POST /echoservice/json HTTP/1.1

Host: localhost:5000

User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; de; rv:1.9.1.6) Gecko/20091216 Iceweasel/3.5.8 (like Firefox/3.5.8)

Accept: text/html,application/xhtml+xml,application/xml;q=0.9,/;q=0.8

Accept-Language: de-de,de;q=0.8,en-us;q=0.5,en;q=0.3

Accept-Encoding: gzip,deflate

Accept-Charset: ISO-8859-1,utf-8;q=0.7,;q=0.7

Keep-Alive: 300

Connection: keep-alive

Content-Type: text/plain; charset=utf-8

Referer: http://localhost:5000/output/JSONRPCExample.mozilla.cache.html

Content-Length: 148

Pragma: no-cache

Cache-Control: no-cache

{"id":2,"method":"echo","params":["{'Test'} [\"String\"]\n\tTest Tab\nTest Newline\n\nafter newline\nLiteral String:\n{'Test'} [
\"String
\"]\n"]}

HTTP/1.0 500 Internal Server Error

Server: PasteWSGIServer/0.5 Python/2.6.4+

Date: Sun, 06 Jun 2010 17:29:58 GMT

Content-Type: text/html

X-Debug-URL: http://localhost:5000/_debug/view/1275845149

Connection: close

Think it must be something with pylons. Can somebody help me out? This comment is not visible to normal users. Undelete comment Comment by cornelis.bos, Jun 16, 2010

Pyjamas with Pylons example for todays pyjamas and Pylons1.0 Install pyjamas¶

Use git or get a git snapshot:

git clone https://github.com/pyjs/pyjs.git

or

wget -O pyjamas.tar.gz 'http://pyjamas.git.sourceforge.net/git/gitweb.cgi?p=pyjamas/pyjamas;a=snapshot;h=HEAD;sf=tgz' tar xzf pyjamas.tar.gz

and then bootstrap and test:

cd pyjamas python bootstrap.py cd examples ./buildall.sh firefox helloworld/output/Hello.html cd ../..

Install pylons¶

wget http://www.pylonshq.com/download/1.0/go-pylons.py python go-pylons.py pylons

Create echo project¶

Activate pylons:

cd /pylons . ./bin/acivate

Create project directories:

paster create --template pylons echo

Copy jsonrpc example:

cd echo/echo/public cp -pr ../../../../pyjamas/examples/jsonrpc/* .

Modify JSONRPCExample.py:

class EchoServicePython(JSONProxy): def __init__(self): JSONProxy.__init__(self, "/echoservice/jsonrpc", ["echo", ...

Build pyjamas client:

../../../../pyjamas/bin/pyjsbuild JSONRPCExample.py

Create controler:

cd ../.. paster controller echoservice

Modify echo/controllers/echoservice.py:

return 'Hello World'

  1. Start addition def echo(self, data): return data

def reverse(self, data): return data[::-1]

def uppercase(self, data): return data.upper()

def lowercase(self, data): return data.lower()

  1. End addition

Modify echo/lib/base.py:

from pylons.templating import render_mako as render

  1. Start addition from pylons import request from pylons.decorators import jsonify import simplejson import urllib

class JSONError(RuntimeError): def __init__(self, code, message, data=None): self.code = code self.message = message self.data = data

def jsonDict(self): return dict(code=self.code, message=self.message, data=self.data)

def __repr__(self): return "JSONError(%s, %r, %r)" % (self.code, self.message, self.data)

def __str__(self): return self.__repr__()

  1. End addition

class BaseController(WSGIController):

and

return WSGIController.__call__(self, environ, start_response)

  1. Start addition @jsonify def jsonrpc(self): session = request.environ['beaker.session'] body = urllib.unquote(request.body) json = simplejson.loads(body) id = json['id'] params = json['params'] method = json['method'] try: if not hasattr(self, method): raise JSONError(-32601, "method '%s' not found" % method) if isinstance(params, dict): kwargs = {} for k, v in params.iteritems(): kwargs[str(k)] = v return dict(jsonrpc="2.0", id=id, result=getattr(self, method)(kwargs)) return dict(jsonrpc="2.0", id=id, result=getattr(self, method)(*params)) except JSONError, e: return dict(jsonrpc="2.0", id=id, error=e.jsonDict())
  2. End addition

Test pylons echoservice¶

Start pylons:

paster serve --reload development.ini

Check echoserivice "helloworld":

http://127.0.0.1:5000/echoservice/index

Test pyjamas echo client:

http://127.0.0.1:5000/output/JSONRPCExample.html

Delete comment Comment by cornelis.bos, Jun 16, 2010

Pyjamas with Pylons example for todays pyjamas and Pylons 1.0 Install pyjamas¶

Use git or get a git snapshot:

git clone https://github.com/pyjs/pyjs.git

or

wget -O pyjamas.tar.gz 'http://pyjamas.git.sourceforge.net/git/gitweb.cgi?p=pyjamas/pyjamas;a=snapshot;h=HEAD;sf=tgz' tar xzf pyjamas.tar.gz

and then bootstrap and test:

cd pyjamas python bootstrap.py cd examples ./buildall.sh firefox helloworld/output/Hello.html cd ../..

Install pylons¶

wget http://www.pylonshq.com/download/1.0/go-pylons.py python go-pylons.py pylons

Create echo project¶

Activate pylons:

cd pylons . ./bin/acivate

Create project directories:

paster create --template pylons echo

Copy jsonrpc example:

cd echo/echo/public cp -pr ../../../../pyjamas/examples/jsonrpc/* .

Modify JSONRPCExample.py:

class EchoServicePython(JSONProxy): def __init__(self): JSONProxy.__init__(self, "/echoservice/jsonrpc", ["echo", ...

Build pyjamas client:

../../../../pyjamas/bin/pyjsbuild JSONRPCExample.py

Create controler:

cd ../.. paster controller echoservice

Modify echo/controllers/echoservice.py:

return 'Hello World'

  1. Start addition def echo(self, data): return data

def reverse(self, data): return data[::-1]

def uppercase(self, data): return data.upper()

def lowercase(self, data): return data.lower()

  1. End addition

Modify echo/lib/base.py:

from pylons.templating import render_mako as render

  1. Start addition from pylons import request from pylons.decorators import jsonify import simplejson import urllib

class JSONError(RuntimeError): def __init__(self, code, message, data=None): self.code = code self.message = message self.data = data

def jsonDict(self): return dict(code=self.code, message=self.message, data=self.data)

def __repr__(self): return "JSONError(%s, %r, %r)" % (self.code, self.message, self.data)

def __str__(self): return self.__repr__()

  1. End addition

class BaseController(WSGIController):

and

return WSGIController.__call__(self, environ, start_response)

  1. Start addition @jsonify def jsonrpc(self): session = request.environ['beaker.session'] body = urllib.unquote(request.body) json = simplejson.loads(body) id = json['id'] params = json['params'] method = json['method'] try: if not hasattr(self, method): raise JSONError(-32601, "method '%s' not found" % method) if isinstance(params, dict): kwargs = {} for k, v in params.iteritems(): kwargs[str(k)] = v return dict(jsonrpc="2.0", id=id, result=getattr(self, method)(kwargs)) return dict(jsonrpc="2.0", id=id, result=getattr(self, method)(*params)) except JSONError, e: return dict(jsonrpc="2.0", id=id, error=e.jsonDict())
  2. End addition

Test pylons echoservice¶

Start pylons:

paster serve --reload development.ini

Check echoserivice "helloworld":

http://127.0.0.1:5000/echoservice/index

Test pyjamas echo client:

http://127.0.0.1:5000/output/JSONRPCExample.html

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