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#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# Copyright (C) 2007 Christopher Lenz
# All rights reserved.
#
# This software is licensed as described in the file COPYING, which
# you should have received as part of this distribution.
"""Implementation of a view server for functions written in Python."""
import os
import simplejson as json
import sys
import traceback
from codecs import BOM_UTF8
from types import FunctionType
__all__ = ['main', 'run']
__docformat__ = 'restructuredtext en'
def run(input=sys.stdin, output=sys.stdout):
r"""CouchDB view function handler implementation for Python.
>>> from StringIO import StringIO
>>> output = StringIO()
>>> run(input=StringIO('["reset"]\n'), output=output)
>>> print output.getvalue()
true
<BLANKLINE>
>>> output = StringIO()
>>> run(input=StringIO('["add_fun", "def fun(doc): yield None, doc"]\n'),
... output=output)
>>> print output.getvalue()
true
<BLANKLINE>
>>> output = StringIO()
>>> run(input=StringIO('["add_fun", "def fun(doc): yield None, doc"]\n'
... '["map_doc", {"foo": "bar"}]\n'),
... output=output)
>>> print output.getvalue()
true
[[[null, {"foo": "bar"}]]]
<BLANKLINE>
:param input: the readable file-like object to read input from
:param output: the writable file-like object to write output to
"""
functions = []
def reset():
del functions[:]
return True
def add_fun(string):
string = BOM_UTF8 + string.encode('utf-8')
globals_ = {}
try:
exec string in {}, globals_
except Exception, e:
return {'error': {'id': 'map_compilation_error', 'reason': e.args[0]}}
err = {'error': {
'id': 'map_compilation_error',
'reason': 'string must eval to a function (ex: "def(doc): return 1")'
}}
if len(globals_) != 1:
return err
function = globals_.values()[0]
if type(function) is not FunctionType:
return err
functions.append(function)
return True
def map_doc(doc):
results = []
for function in functions:
try:
results.append([[key, value] for key, value in function(doc)])
except Exception, e:
results.append([])
output.write(json.dumps({'log': e.args[0]}))
return results
def reduce(*cmd, **kwargs):
code = BOM_UTF8 + cmd[0][0].encode('utf-8')
args = cmd[1:][0]
globals_ = {}
try:
exec code in {}, globals_
except Exception, e:
return {'error': {
'id': 'reduce_compilation_error',
'reason': e.args[0]
}}
err = {'error': {
'id': 'reduce_compilation_error',
'reason': 'string must eval to a function (ex: "def(doc): return 1")'
}}
if len(globals_) != 1:
return err
function = globals_.values()[0]
if type(function) is not FunctionType:
return err
results = []
keys, vals = zip(*args)
if function.func_code.co_argcount == 3:
results = function(keys, vals, kwargs.get('rereduce', False))
else:
results = function(keys, vals)
return [True, [results]]
def rereduce(*cmd):
reduce(cmd, rereduce=True)
handlers = {'reset': reset, 'add_fun': add_fun, 'map_doc': map_doc,
'reduce': reduce, 'rereduce': rereduce}
try:
while True:
line = input.readline()
if not line:
break
try:
cmd = json.loads(line)
except ValueError, e:
sys.stderr.write('error: %s\n' % e)
sys.stderr.flush()
return 1
else:
retval = handlers[cmd[0]](*cmd[1:])
output.write(json.dumps(retval))
output.write('\n')
output.flush()
except KeyboardInterrupt:
return 0
_VERSION = """%(name)s - CouchDB Python %(version)s
Copyright (C) 2007 Christopher Lenz <cmlenz@gmx.de>.
"""
_HELP = """Usage: %(name)s [OPTION]
The %(name)s command runs the CouchDB Python view server.
The exit status is 0 for success or 1 for failure.
Options:
--version display version information and exit
-h, --help display a short help message and exit
Report bugs via the web at <http://code.google.com/p/couchdb-python>.
"""
def main():
"""Command-line entry point for running the view server."""
import getopt
from couchdb import __version__ as VERSION
try:
option_list, argument_list = getopt.gnu_getopt(
sys.argv[1:], 'h', ['version', 'help'])
message = None
for option, value in option_list:
if option in ('--version'):
message = _VERSION % dict(name=os.path.basename(sys.argv[0]),
version=VERSION)
elif option in ('-h', '--help'):
message = _HELP % dict(name=os.path.basename(sys.argv[0]))
if message:
sys.stdout.write(message)
sys.stdout.flush()
sys.exit(0)
except getopt.GetoptError, error:
message = '%s\n\nTry `%s --help` for more information.\n' % (
str(error), os.path.basename(sys.argv[0])
)
sys.stderr.write(message)
sys.stderr.flush()
sys.exit(1)
sys.exit(run())
if __name__ == '__main__':
main()
|
