#!/usr/bin/python # Copyright (C) 2012 Humbug, Inc. # # Permission is hereby granted, free of charge, to any person # obtaining a copy of this software and associated documentation files # (the "Software"), to deal in the Software without restriction, # including without limitation the rights to use, copy, modify, merge, # publish, distribute, sublicense, and/or sell copies of the Software, # and to permit persons to whom the Software is furnished to do so, # subject to the following conditions: # # The above copyright notice and this permission notice shall be # included in all copies or substantial portions of the Software. # # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, # EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF # MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND # NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS # BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN # ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN # CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE # SOFTWARE. import simplejson import requests import time import traceback import urlparse import sys import os # Check that we have a recent enough version # Older versions don't provide the 'json' attribute on responses. assert(requests.__version__ > '0.12') API_VERSTRING = "/api/v1/" class Client(object): def __init__(self, email, api_key=None, api_key_file=None, verbose=False, retry_on_errors=True, site="https://humbughq.com", client="API"): if api_key is None: if api_key_file is None: api_key_file = os.path.join(os.environ["HOME"], ".humbug-api-key") if not os.path.exists(api_key_file): raise RuntimeError("api_key not specified and %s does not exist" % (api_key_file,)) with file(api_key_file, 'r') as f: api_key = f.read().strip() self.api_key = api_key self.email = email self.verbose = verbose self.base_url = site self.retry_on_errors = retry_on_errors self.client_name = client def do_api_query(self, orig_request, url, longpolling = False): request = {} request["email"] = self.email request["api-key"] = self.api_key request["client"] = self.client_name for (key, val) in orig_request.iteritems(): if not (isinstance(val, str) or isinstance(val, unicode)): request[key] = simplejson.dumps(val) else: request[key] = val query_state = { 'had_error_retry': False, 'request': request, 'failures': 0, } def error_retry(error_string): if not self.retry_on_errors or query_state["failures"] >= 10: return False if self.verbose: if not query_state["had_error_retry"]: sys.stdout.write("humbug API(%s): connection error%s -- retrying." % \ (url.split(API_VERSTRING, 2)[1], error_string,)) query_state["had_error_retry"] = True else: sys.stdout.write(".") sys.stdout.flush() query_state["request"]["dont_block"] = simplejson.dumps(True) time.sleep(1) query_state["failures"] += 1 return True def end_error_retry(succeeded): if query_state["had_error_retry"] and self.verbose: if succeeded: print "Success!" else: print "Failed!" while True: try: res = requests.post(urlparse.urljoin(self.base_url, url), data=query_state["request"], verify=True, timeout=55) # On 50x errors, try again after a short sleep if str(res.status_code).startswith('5'): if error_retry(" (server %s)" % (res.status_code,)): continue # Otherwise fall through and process the python-requests error normally except (requests.exceptions.Timeout, requests.exceptions.SSLError) as e: # Timeouts are either a Timeout or an SSLError; we # want the later exception handlers to deal with any # non-timeout other SSLErrors if (isinstance(e, requests.exceptions.SSLError) and str(e) != "The read operation timed out"): raise if longpolling: # When longpolling, we expect the timeout to fire, # and the correct response is to just retry continue else: end_error_retry(False) return {'msg': "Connection error:\n%s" % traceback.format_exc(), "result": "connection-error"} except requests.exceptions.ConnectionError: if error_retry(""): continue end_error_retry(False) return {'msg': "Connection error:\n%s" % traceback.format_exc(), "result": "connection-error"} except Exception: # We'll split this out into more cases as we encounter new bugs. return {'msg': "Unexpected error:\n%s" % traceback.format_exc(), "result": "unexpected-error"} if res.json is not None: end_error_retry(True) return res.json end_error_retry(False) return {'msg': res.text, "result": "http-error", "status_code": res.status_code} @classmethod def _register(cls, name, url=None, make_request=(lambda request={}: request), **query_kwargs): if url is None: url = name def call(self, *args, **kwargs): request = make_request(*args, **kwargs) return self.do_api_query(request, API_VERSTRING + url, **query_kwargs) call.func_name = name setattr(cls, name, call) def call_on_each_message(self, callback, options = {}): max_message_id = None while True: if max_message_id is not None: options["last"] = str(max_message_id) res = self.get_messages(options) if 'error' in res.get('result'): if self.verbose: if res["result"] == "http-error": print "HTTP error fetching messages -- probably a server restart" elif res["result"] == "connection-error": print "Connection error fetching messages -- probably server is temporarily down?" else: print "Server returned error:\n%s" % res["msg"] # TODO: Make this back off once it's more reliable time.sleep(1) continue for message in sorted(res['messages'], key=lambda x: int(x["id"])): max_message_id = max(max_message_id, int(message["id"])) callback(message) def _mk_subs(streams): return {'subscriptions': streams} Client._register('send_message', make_request=(lambda request: request)) Client._register('get_messages', longpolling=True) Client._register('get_profile') Client._register('get_public_streams') Client._register('list_subscriptions', url='subscriptions/list') Client._register('add_subscriptions', url='subscriptions/add', make_request=_mk_subs) Client._register('remove_subscriptions', url='subscriptions/remove', make_request=_mk_subs)