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https://github.com/bigchaindb/bigchaindb.git
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76 lines
2.1 KiB
Python
76 lines
2.1 KiB
Python
"""This module monitors for stale transactions.
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It reassigns transactions which have been assigned a node but
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remain in the backlog past a certain amount of time.
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"""
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import logging
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from multipipes import Pipeline, Node
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from bigchaindb import Bigchain
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from time import sleep
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logger = logging.getLogger(__name__)
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class StaleTransactionMonitor:
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"""This class encapsulates the logic for re-assigning stale transactions.
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Note:
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Methods of this class will be executed in different processes.
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"""
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def __init__(self, timeout=5, backlog_reassign_delay=None):
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"""Initialize StaleTransaction monitor
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Args:
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timeout: how often to check for stale tx (in sec)
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backlog_reassign_delay: How stale a transaction should
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be before reassignment (in sec). If supplied, overrides the
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Bigchain default value.
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"""
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self.bigchain = Bigchain(backlog_reassign_delay=backlog_reassign_delay)
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self.timeout = timeout
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def check_transactions(self):
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"""Poll backlog for stale transactions
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Returns:
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txs (list): txs to be re assigned
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"""
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sleep(self.timeout)
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for tx in self.bigchain.get_stale_transactions():
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yield tx
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def reassign_transactions(self, tx):
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"""Put tx back in backlog with new assignee
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Returns:
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transaction
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"""
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self.bigchain.reassign_transaction(tx)
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return tx
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def create_pipeline(timeout=5, backlog_reassign_delay=5):
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"""Create and return the pipeline of operations to be distributed
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on different processes."""
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stm = StaleTransactionMonitor(timeout=timeout,
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backlog_reassign_delay=backlog_reassign_delay)
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monitor_pipeline = Pipeline([
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Node(stm.check_transactions),
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Node(stm.reassign_transactions)
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])
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return monitor_pipeline
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def start(timeout=5, backlog_reassign_delay=5):
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"""Create, start, and return the block pipeline."""
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pipeline = create_pipeline(timeout=timeout,
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backlog_reassign_delay=backlog_reassign_delay)
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pipeline.start()
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return pipeline
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