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import pycurl, json |
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2
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import urllib |
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3
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import signal |
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4
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import sys |
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5
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import time |
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6
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7
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POST_PARAMS = {} |
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8
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9
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class Client: |
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10
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def __init__(self, sensor, api_url, api_user, api_password): |
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if sensor is not None: |
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self._sensor = sensor |
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else: |
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self._sensor = None |
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self.conn = None |
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self.buffer = '' |
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self.keep_trying = 1 |
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self.api_url = api_url |
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self.api_user = api_user |
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self.api_password = api_password |
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21
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22
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signal.signal(signal.SIGINT, self.handle_ctrl_c) |
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23
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24
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def handle_ctrl_c(self, signal, frame): |
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if self._sensor is not None: |
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sensor.logger.info('SIGINT receivied') |
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else: |
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print 'You pressed Ctrl+C!' |
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self.abort_session() |
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30
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31
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def abort_session(self): |
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self.keep_trying = 0 |
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self.conn.close() |
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34
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35
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def setup_connection(self): |
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36
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if self.conn: |
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self.conn.close() |
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39
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self.buffer = '' |
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40
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self.headers = ['Accept: application/json', 'Expect:'] |
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41
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self.conn = pycurl.Curl() |
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42
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self.conn.setopt(pycurl.SSL_VERIFYHOST, False) |
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43
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self.conn.setopt(pycurl.SSL_VERIFYPEER, False) |
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self.conn.setopt(pycurl.USERPWD, "%s:%s" % (self.api_user, self.api_password)) |
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45
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self.conn.setopt(pycurl.URL, self.api_url) |
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46
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self.conn.setopt(pycurl.VERBOSE, 1) |
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self.conn.setopt(pycurl.WRITEFUNCTION, self.on_receive) |
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48
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self.conn.setopt(pycurl.NOSIGNAL, 1) |
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49
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self.conn.setopt(pycurl.NOPROGRESS, 0) |
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self.conn.setopt(pycurl.PROGRESSFUNCTION, self.on_progress) |
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51
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self.conn.setopt(pycurl.HTTPHEADER, self.headers) |
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52
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self.conn.setopt(pycurl.POST, 1) |
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53
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self.conn.setopt(pycurl.POSTFIELDS, urllib.urlencode(POST_PARAMS)) |
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54
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55
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def on_receive(self, data): |
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self.buffer += data |
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57
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if data.endswith('\n') and self.buffer.strip(): |
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58
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# complete message received |
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59
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event = json.loads(self.buffer) |
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60
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self.buffer = '' |
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61
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if self._sensor is not None: |
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self._sensor.process_event(event) |
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63
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else: |
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print event |
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66
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def on_progress(self, d_total, downloaded, u_total, uploaded): |
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pass |
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#print "on_progress called" |
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69
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70
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def __del__(self): |
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71
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self.conn.close() |
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72
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73
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def start(self): |
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74
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if self._sensor is not None: |
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75
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self._sensor.logger.info('pyCurl started.') |
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76
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backoff_network_error = 0.25 |
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backoff_http_error = 5 |
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78
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backoff_rate_limit = 60 |
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79
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while True and self.keep_trying == 1: |
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80
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if self._sensor is not None: |
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81
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self._sensor.logger.info('keep trying = %i', self.keep_trying) |
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82
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else: |
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print "keep trying = %i" % self.keep_trying |
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84
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self.setup_connection() |
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85
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try: |
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86
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self.conn.perform() |
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87
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except: |
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88
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# Network error, use linear back off up to 16 seconds |
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if self.keep_trying == 0: |
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90
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continue |
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91
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if self._sensor is not None: |
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92
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self._sensor.logger.info('Network error: %s', self.conn.errstr()) |
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93
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self._sensor.logger.info('Waiting %s seconds before trying again', backoff_network_error) |
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else: |
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print 'Network error: %s' % self.conn.errstr() |
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print 'Waiting %s seconds before trying again' % backoff_network_error |
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time.sleep(backoff_network_error) |
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backoff_network_error = min(backoff_network_error + 1, 16) |
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continue |
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100
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# HTTP Error |
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101
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sc = self.conn.getinfo(pycurl.HTTP_CODE) |
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102
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if sc == 420: |
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103
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# Rate limit, use exponential back off starting with 1 minute and double each attempt |
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104
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if self._sensor is not None: |
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self._sensor.logger.info('Rate limit, waiting %s seconds', backoff_rate_limit) |
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106
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else: |
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107
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print 'Rate limit, waiting %s seconds' % backoff_rate_limit |
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108
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time.sleep(backoff_rate_limit) |
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109
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backoff_rate_limit *= 2 |
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110
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elif sc == 401: |
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111
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# Authentication error |
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112
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if self._sensor is not None: |
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113
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self._sensor.logger.info('Authentication error, check user/password, waiting %s seconds', backoff_rate_limit) |
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114
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else: |
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print 'Authentication error, check user/password, waiting %s seconds' % backoff_rate_limit |
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116
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time.sleep(backoff_rate_limit) |
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backoff_rate_limit *= 2 |
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118
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elif sc == 404: |
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119
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# Authorization error |
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120
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if self._sensor is not None: |
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121
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self._sensor.logger.info('Authorization error, check permissions, waiting %s seconds', backoff_rate_limit) |
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122
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else: |
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123
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print 'Authorization error, check permissions, waiting %s seconds' % backoff_rate_limit |
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124
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time.sleep(backoff_rate_limit) |
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125
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backoff_rate_limit *= 2 |
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126
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else: |
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127
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# HTTP error, use exponential back off up to 320 seconds |
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128
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if self._sensor is not None: |
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129
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self._sensor.logger.info('HTTP error %s, %s', sc, self.conn.errstr()) |
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130
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self._sensor.logger.info('Waiting %s seconds', backoff_http_error) |
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else: |
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print 'HTTP error %s, %s' % (sc, self.conn.errstr()) |
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print 'Waiting %s seconds' % backoff_http_error |
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time.sleep(backoff_http_error) |
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135
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backoff_http_error = min(backoff_http_error * 2, 320) |
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136
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137
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StackStorm /
st2contrib
