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21 results

parser.py

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  • autoretry.py 3.56 KiB
    def autoretry_datastore_timeouts(attempts=5.0, interval=0.1, exponent=2.0):
        """
        Copyright (C)  2009  twitter.com/rcb
        
        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.
        
        ======================================================================
        
        This function wraps the AppEngine Datastore API to autoretry 
        datastore timeouts at the lowest accessible level.  
    
        The benefits of this approach are:
    
        1. Small Footprint:  Does not monkey with Model internals 
                             which may break in future releases.
        2. Max Performance:  Retrying at this lowest level means 
                             serialization and key formatting is not 
                             needlessly repeated on each retry.
        At initialization time, execute this:
        
        >>> autoretry_datastore_timeouts()
        
        Should only be called once, subsequent calls have no effect.
        
        >>> autoretry_datastore_timeouts() # no effect
        
        Default (5) attempts: .1, .2, .4, .8, 1.6 seconds
        
        Parameters can each be specified as floats.
        
        :param attempts: maximum number of times to retry.
        :param interval: base seconds to sleep between retries.
        :param exponent: rate of exponential back-off.
        """
        
        import time, logging
        from google.appengine.api import apiproxy_stub_map
        from google.appengine.runtime import apiproxy_errors
        from google.appengine.datastore import datastore_pb
        
        attempts = float(attempts)
        interval = float(interval)
        exponent = float(exponent)
        wrapped = apiproxy_stub_map.MakeSyncCall
        errors = {datastore_pb.Error.TIMEOUT:'Timeout',
            datastore_pb.Error.CONCURRENT_TRANSACTION:'TransactionFailedError'}
        
        def wrapper(*args, **kwargs):
            count = 0.0
            while True:
                try:
                    return wrapped(*args, **kwargs)
                except apiproxy_errors.ApplicationError, err:
                    errno = err.application_error
                    if errno not in errors: raise
                    sleep = (exponent ** count) * interval
                    count += 1.0
                    if count > attempts: raise
                    msg = "Datastore %s: retry #%d in %s seconds.\n%s"
                    vals = ''
                    if count == 1.0:
                        vals = '\n'.join([str(a) for a in args])
                    logging.warning(msg % (errors[errno], count, sleep, vals))
                    time.sleep(sleep)
    
        setattr(wrapper, '_autoretry_datastore_timeouts', False)
        if getattr(wrapped, '_autoretry_datastore_timeouts', True):
            apiproxy_stub_map.MakeSyncCall = wrapper