# Path: database.py
# def txn_required(func):
#     @functools.wraps(func)
#     def _func(*args, **kwargs):
#         txn = current_txn()
#         if txn:
#             return func(*args, **kwargs)
#         else:
#             return run_in_transaction(func, txn_name=func.__name__, *args, **kwargs)
#     return _func
# 
# class TxnAbort(Exception):
#     def __init__(self, callback=None, *args, **kwargs):
#         self.__callback = callback
#         self.__args = args
#         self.__kwargs = kwargs
#         
#     @property
#     def callback(self):
#         if self.__callback:
#             return lambda: self.__callback(*self.__args, **self.__kwargs)
#         else:
#             return None
#             
#     def __call__(self):
#         cb = self.callback
#         if cb: return cb()
# 
# @contextmanager
# def Transaction(name="*UNKNOWN*", flags=DEFAULT_TXN_FLAGS):
#         txn = begin_txn(flags)
#         txn.set_name(name)
#         txn_log.debug("TXN BEGIN %s", repr(txn))
#         try:
#             yield txn
#         except Exception as e:
#             txn_log.debug("TXN ABORT %s", repr(txn)) 
#             abort_txn()
#             raise
#         txn_log.debug("TXN COMMIT %s", repr(txn))
#         commit_txn()


import eventlet
import genesisblock
import msgs
import jserialize as js
import bserialize as bs
import logging
import settings
import database
import transactions
import struct
    import sys
    import time
        import debug
from utils import *
from database import txn_required, TxnAbort, Transaction
        for i in range(interval-1):
            first_blk = first_blk.get_prev()
        realtimespan = self.block.time - first_blk.block.time
        log.info("DIFF: timespan before limits: %d", realtimespan)
        if realtimespan < targettimespan/4: realtimespan = targettimespan/4
        if realtimespan > targettimespan*4: realtimespan = targettimespan*4
        log.info("DIFF: timespan after limits: %d", realtimespan)
        newtarget = (bits_to_target(self.block.bits)*realtimespan)/targettimespan
        if newtarget > bits_to_target(0x1d00ffff):
            newtarget = bits_to_target(0x1d00ffff)
        bits = target_to_bits(newtarget)
        log.info("DIFF: next bits: %s", hex(bits))
        return bits
        
    def verify(self):
        if self.chain == INVALID_CHAIN:
            return False
        if not check_bits(self.block.bits, self.hash):
            return False
        prev_blk = self.get_prev()
        if prev_blk.chain == INVALID_CHAIN:
            return False
        if prev_blk.get_next_bits() != self.block.bits:
            return False
        return True
        
    @txn_required    
    def confirm(self):
        log.info("confirming block %s(%d)", h2h(self.hash), self.number)
        if not self.verify():

# Path: database.py
# def txn_required(func):
#     @functools.wraps(func)
#     def _func(*args, **kwargs):
#         txn = current_txn()
#         if txn:
#             return func(*args, **kwargs)
#         else:
#             return run_in_transaction(func, txn_name=func.__name__, *args, **kwargs)
#     return _func
# 
# class TxnAbort(Exception):
#     def __init__(self, callback=None, *args, **kwargs):
#         self.__callback = callback
#         self.__args = args
#         self.__kwargs = kwargs
#         
#     @property
#     def callback(self):
#         if self.__callback:
#             return lambda: self.__callback(*self.__args, **self.__kwargs)
#         else:
#             return None
#             
#     def __call__(self):
#         cb = self.callback
#         if cb: return cb()
# 
# @contextmanager
# def Transaction(name="*UNKNOWN*", flags=DEFAULT_TXN_FLAGS):
#         txn = begin_txn(flags)
#         txn.set_name(name)
#         txn_log.debug("TXN BEGIN %s", repr(txn))
#         try:
#             yield txn
#         except Exception as e:
#             txn_log.debug("TXN ABORT %s", repr(txn)) 
#             abort_txn()
#             raise
#         txn_log.debug("TXN COMMIT %s", repr(txn))
#         commit_txn()


# Path: blockchain.py
import eventlet
import genesisblock
import msgs
import jserialize as js
import bserialize as bs
import logging
import settings
import database
import transactions
import struct
    import sys
    import time
        import debug
from utils import *
from database import txn_required, TxnAbort, Transaction

        for i in range(interval-1):
            first_blk = first_blk.get_prev()
        realtimespan = self.block.time - first_blk.block.time
        log.info("DIFF: timespan before limits: %d", realtimespan)
        if realtimespan < targettimespan/4: realtimespan = targettimespan/4
        if realtimespan > targettimespan*4: realtimespan = targettimespan*4
        log.info("DIFF: timespan after limits: %d", realtimespan)
        newtarget = (bits_to_target(self.block.bits)*realtimespan)/targettimespan
        if newtarget > bits_to_target(0x1d00ffff):
            newtarget = bits_to_target(0x1d00ffff)
        bits = target_to_bits(newtarget)
        log.info("DIFF: next bits: %s", hex(bits))
        return bits
        
    def verify(self):
        if self.chain == INVALID_CHAIN:
            return False
        if not check_bits(self.block.bits, self.hash):
            return False
        prev_blk = self.get_prev()
        if prev_blk.chain == INVALID_CHAIN:
            return False
        if prev_blk.get_next_bits() != self.block.bits:
            return False
        return True
        
    @txn_required    
    def confirm(self):
        log.info("confirming block %s(%d)", h2h(self.hash), self.number)
        if not self.verify():

            raise Invalidblock()