399 lines
14 KiB
Python
399 lines
14 KiB
Python
#!/usr/bin/env python
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"""
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Client library to communicate with a Refine server.
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"""
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import csv
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import json
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import gzip
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import os
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import re
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import StringIO
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import urllib
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import urllib2_file
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import urllib2
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import urlparse
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REFINE_HOST = os.environ.get('GOOGLE_REFINE_HOST', '127.0.0.1')
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REFINE_PORT = os.environ.get('GOOGLE_REFINE_PORT', '3333')
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def to_camel(attr):
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"""convert this_attr_name to thisAttrName."""
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# Do lower case first letter
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return (attr[0].lower() +
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re.sub(r'_(.)', lambda x: x.group(1).upper(), attr[1:]))
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def from_camel(attr):
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"""convert thisAttrName to this_attr_name."""
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# Don't add an underscore for capitalized first letter
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return re.sub(r'(?<=.)([A-Z])', lambda x: '_' + x.group(1), attr).lower()
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class Facet(object):
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def __init__(self, column, type, expression='value', **options):
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self.type = type
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self.column_name = column
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self.name = column # XXX not sure what the difference is yet
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self.selection = []
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self.expression = expression
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for k, v in options.items():
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setattr(self, k, v)
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def as_dict(self):
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return dict([(to_camel(k), v) for k, v in self.__dict__.items()
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if v is not None])
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def include(self, selection):
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for s in self.selection:
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if s['v']['v'] == selection:
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return
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self.selection.append({'v': {'v': selection, 'l': selection}})
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def exclude(self, selection):
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self.selection = [s for s in self.selection if s['v']['v'] != selection]
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def reset(self):
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self.selection = []
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class TextFacet(Facet):
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def __init__(self, column, omit_blank=False, omit_error=False, select_blank=False, select_error=False, invert=False, **options):
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super(TextFacet, self).__init__(
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column,
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type='list',
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omit_blank=omit_blank,
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omit_error=omit_error,
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select_blank=select_blank,
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select_error=select_error,
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invert=invert,
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**options)
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# Capitalize 'From' to get around python's reserved word.
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class NumericFacet(Facet):
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def __init__(self, column, From=None, to=None, select_blank=True, select_error=True, select_non_numeric=True, select_numeric=True, **options):
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super(NumericFacet, self).__init__(
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column,
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type='range',
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select_blank=select_blank,
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select_error=select_error,
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select_non_numeric=select_non_numeric,
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select_numeric=select_numeric,
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From=From,
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to=to,
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**options)
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class FacetResponse(object):
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def __init__(self, facet):
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for k, v in facet.items():
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if isinstance(k, bool) or isinstance(k, basestring):
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setattr(self, from_camel(k), v)
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self.choices = {}
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class FacetChoice(object):
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def __init__(self, c):
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self.count = c['c']
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self.selected = c['s']
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if 'choices' in facet:
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for choice in facet['choices']:
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self.choices[choice['v']['v']] = FacetChoice(choice)
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if 'blankChoice' in facet:
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self.blank_choice = FacetChoice(facet['blankChoice'])
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else:
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self.blank_choice = None
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if 'bins' in facet:
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self.bins = facet['bins']
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self.base_bins = facet['baseBins']
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class FacetsResponse(object):
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def __init__(self, facets):
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self.facets = [FacetResponse(f) for f in facets['facets']]
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self.mode = facets['mode']
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class Engine(object):
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def __init__(self, facets=None, mode='row-based'):
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if facets is None:
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facets = []
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elif not isinstance(facets, list):
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facets = [facets]
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self.facets = facets
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self.mode = mode
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def as_dict(self):
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return {
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'facets': [f.as_dict() for f in self.facets], # XXX how with json?
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'mode': self.mode,
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}
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def __len__(self):
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return len(self.facets)
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def as_json(self):
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return json.dumps(self.as_dict())
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def add_facet(self, facet):
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self.facets.append(facet)
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def remove_all(self):
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self.facets = []
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def reset_all(self):
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for facet in self.facets:
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facet.reset()
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class RefineServer(object):
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"""Communicate with a Refine server."""
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def __init__(self, server='http://%s:%s' % (REFINE_HOST, REFINE_PORT)):
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self.server = server[:-1] if server.endswith('/') else server
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def urlopen(self, command, data=None, project_id=None):
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"""Open a Refine URL and optionally POST data."""
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url = self.server + '/command/core/' + command
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if data is None:
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data = {}
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if project_id:
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# XXX haven't figured out pattern on qs v body
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if 'delete' in command:
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data['project'] = project_id
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else:
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url += '?project=' + project_id
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req = urllib2.Request(url)
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if data:
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req.add_data(data) # data = urllib.urlencode(data)
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#req.add_header('Accept-Encoding', 'gzip')
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response = urllib2.urlopen(req)
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if response.info().get('Content-Encoding', None) == 'gzip':
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# Need a seekable filestream for gzip
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gzip_fp = gzip.GzipFile(fileobj=StringIO.StringIO(response.read()))
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# XXX Monkey patch response's filehandle. Better way?
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urllib.addbase.__init__(response, gzip_fp)
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return response
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def urlopen_json(self, *args, **kwargs):
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"""Open a Refine URL, optionally POST data, and return parsed JSON."""
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response = self.urlopen(*args, **kwargs)
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data = response.read()
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response_json = json.loads(data)
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if 'code' in response_json and response_json['code'] == 'error':
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raise Exception(response_json['message'])
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return response_json
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class Refine:
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"""Class representing a connection to a Refine server."""
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def __init__(self, server, **kwargs):
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if isinstance(server, RefineServer):
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self.server = server
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else:
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self.server = RefineServer(server)
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def get_version(self):
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"""Return version data.
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{"revision":"r1836","full_version":"2.0 [r1836]",
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"full_name":"Google Refine 2.0 [r1836]","version":"2.0"}"""
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return self.server.urlopen_json('get-version')
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def list_projects(self):
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"""Return a dict of projects indexed by id & name.
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{u'1877818633188': {
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'id': u'1877818633188', u'name': u'akg',
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u'modified': u'2011-04-07T12:30:07Z',
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u'created': u'2011-04-07T12:30:07Z'
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},
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{u'akg': { ... } } ...}"""
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projects = self.server.urlopen_json('get-all-project-metadata')['projects']
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# Provide a way for projects to be indexed by name too
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for project_id, metadata in projects.items():
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metadata['id'] = project_id
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projects[metadata['name']] = metadata
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return projects
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def get_project_id_name(self, project):
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"""Returns (project_id, project_name) given either."""
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projects = self.list_projects()
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# Is the project param an integer? If so treat as an id, else a name.
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if re.match(r'^\d+$', project):
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return project, projects[project]['name']
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else:
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return projects[project]['id'], project
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def open_project(self, project):
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"""Open a Refine project referred to by id or name."""
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project_id, project_name = self.get_project_id_name(project)
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return RefineProject(self.server, project_id, project_name)
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def new_project(self, project_file=None, project_url=None, project_name=None,
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split_into_columns=True,
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separator='',
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ignore_initial_non_blank_lines=0,
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header_lines=1, # use 0 if your data has no header
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skip_initial_data_rows=0,
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limit=None, # no more than this number of rows
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guess_value_type=True, # numbers, dates, etc.
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ignore_quotes=False):
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if (project_file and project_url) or (not project_file and not project_url):
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raise ValueError('One (only) of project_file and project_url must be set')
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def s(opt):
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if isinstance(opt, bool):
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return 'on' if opt else ''
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if opt is None:
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return ''
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return str(opt)
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options = {
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'split-into-columns': s(split_into_columns), 'separator': s(separator),
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'ignore': s(ignore_initial_non_blank_lines), 'header-lines': s(header_lines),
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'skip': s(skip_initial_data_rows), 'limit': s(limit),
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'guess-value-type': s(guess_value_type),
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'ignore-quotes': s(ignore_quotes),
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}
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if project_url is not None:
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options['url'] = project_url
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elif project_file is not None:
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options['project-file'] = {
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'fd': open(project_file),
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'filename': project_file,
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}
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if project_name is None:
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# strip extension and directories
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project_name = (project_file or 'New project').rsplit('.', 1)[0]
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project_name = os.path.basename(project_name)
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options['project-name'] = project_name
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response = self.server.urlopen('create-project-from-upload', options)
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# expecting a redirect to the new project containing the id in the url
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url_params = urlparse.parse_qs(urlparse.urlparse(response.geturl()).query)
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if 'project' in url_params:
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project_id = url_params['project'][0]
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return RefineProject(self.server, project_id, project_name)
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else:
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raise Exception('Project not created')
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class RowsResponse(object):
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class RefineRows(object):
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class RefineRow(object):
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def __init__(self, row_response):
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self.flagged = row_response['flagged']
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self.starred = row_response['starred']
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self.index = row_response['i']
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self.row = [c['v'] if c else None for c in row_response['cells']]
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def __init__(self, rows_response):
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self.rows_response = rows_response
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def __iter__(self):
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for row_response in self.rows_response:
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yield self.RefineRow(row_response)
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def __len__(self):
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return len(self.rows_response)
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def __init__(self, response):
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self.mode = response['mode']
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self.filtered = response['filtered']
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self.start = response['start']
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self.limit = response['limit']
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self.total = response['total']
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self.pool = response['pool'] # {"reconCandidates": {},"recons": {}}
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self.rows = self.RefineRows(response['rows'])
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class RefineProject:
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"""A Google Refine project."""
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def __init__(self, server, project_id=None, project_name=None):
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if not isinstance(server, RefineServer):
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url = urlparse.urlparse(server)
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if url.query:
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# Parse out the project ID and create a base server URL
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project_id = url.query[8:] # skip project=
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server = urlparse.urlunparse((url.scheme, url.netloc, '', '', '', ''))
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server = RefineServer(server)
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self.server = server
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if not project_id and not project_name:
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raise Exception('Missing Refine project ID and name; need at least one of those')
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if not project_name or not project_id:
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project_id, project_name = Refine(server).get_project_id_name(project_name or
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project_id)
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self.project_id = project_id
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self.project_name = project_name
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self.columns = [] # columns & column_index filled in by get_models()
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self.column_index = {}
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self.get_models()
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self.engine = Engine()
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def do_raw(self, command, data):
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"""Issue a command to the server & return a response object."""
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return self.server.urlopen(command, self.project_id, data)
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def do_json(self, command, data=None):
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"""Issue a command to the server, parse & return decoded JSON."""
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return self.server.urlopen_json(command, project_id=self.project_id, data=data)
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def get_models(self):
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"""Fill out column metadata."""
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response = self.do_json('get-models')
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column_model = response['columnModel']
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columns = column_model['columns']
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# Pre-extend the list in python
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self.columns = [None] * (1 + max(c['cellIndex'] for c in columns))
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for column in columns:
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cell_index, name = column['cellIndex'], column['name']
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self.column_index[name] = cell_index
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self.columns[cell_index] = name
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self.key_column = column_model['keyColumnName']
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# TODO: implement rest
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def wait_until_idle(self, polling_delay=0.5):
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while True:
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response_json = self.do('get-processes')
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if 'processes' in response_json and len(response_json['processes']) > 0:
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time.sleep(polling_delay)
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else:
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return
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def apply_operations(self, file_path, wait=True):
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json = open(file_path).read()
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response_json = self.do('apply-operations', {'operations': json})
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if response_json['code'] == 'pending':
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if wait:
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self.wait_until_idle()
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return 'ok'
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return response_json['code'] # can be 'ok' or 'pending'
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def export(self, export_format='tsv'):
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"""Return a fileobject of a project's data."""
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data = {
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'engine': Engine().as_json(),
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'format': export_format,
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}
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return self.do_raw(
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'export-rows/' + urllib.quote(self.project_name) + '.' + export_format, data)
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def export_rows(self, **kwargs):
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"""Return an iterable of parsed rows of a project's data."""
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return csv.reader(self.export(**kwargs), dialect='excel-tab')
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def delete(self):
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response_json = self.do_json('delete-project')
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return 'code' in response_json and response_json['code'] == 'ok'
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def compute_facets(self, facets=None):
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if facets:
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self.engine = Engine(facets)
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response = self.do_json('compute-facets',
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{'engine': self.engine.as_json()})
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return FacetsResponse(response)
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def get_rows(self, engine=None, start=0, limit=10):
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response = self.do_json('get-rows', {
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'sorting': "{'criteria': []}", 'engine': self.engine.as_json(),
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'start': start, 'limit': limit})
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return RowsResponse(response)
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