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How to use _compute_hash method in autotest

Best Python code snippet using autotest_python

blockchain.py

Source:blockchain.py

...13        the chain. The block has index 0, previous_hash as 0, and14        a valid hash.15        """16        genesis_block = Block(0,[],0,'0')17        genesis_block.hash = self._compute_hash()18        self.chain.append(genesis_block)19    @property20    def last_block(self):21        #gets the last block of chain22        last_block = self.chain[-1]23        return last_block24    def add_block(self, block, proof):25        """26        A function that adds the block to the chain after verification.27        Verification includes:28        * Checking if the proof is valid.29        * The previous_hash referred in the block and the hash of latest block30          in the chain match.31        """32        previous_hash = self.last_block.hash33        if previous_hash != block.previous_hash:34            return False35        if not Blockchain.is_valid_proof(block, proof):36            return False37        block.hash = proof38        self.chain.append(block)39        return True40    @staticmethod41    def proof_of_work(block):42        """43        Function that tries different values of nonce to get a hash44        that satisfies our difficulty criteria.45        """46        block.nonce = 047        48        computed_hash = block._compute_hash()49        while not computed_hash.startswith('0' * Blockchain.difficulty):50            block.nonce += 151            computed_hash = block._compute_hash()52        return computed_hash53    def add_new_transaction(self, transaction):54        self.unconfirmed_transactions.append(transaction)55    @classmethod56    def is_valid_proof(cls, block, block_hash):57        """58        Check if block_hash is valid hash of block and satisfies59        the difficulty criteria.60        """61        status = (block_hash.startswith('0' * Blockchain.difficulty) and62                block_hash == block._compute_hash())63        return status64    @classmethod65    def check_chain_validity(cls, chain):66        result = True67        previous_hash = "0"68        for block in chain:69            block_hash = block.hash70            # remove the hash field to recompute the hash again71            # using `compute_hash` method.72            delattr(block, "hash")73            if not cls.is_valid_proof(block, block_hash) or \74                    previous_hash != block.previous_hash:75                result = False76                break...

merkle.py

Source:merkle.py

...53        self._hash = None54        self.data = data55    def accept(self, visitor):56        visitor.visit_node(self)57    def _compute_hash(self):58        if self.is_leaf():59            s = str(self._data)60            self._hash = sha256(bytes(s, 'utf-8')).hexdigest()61        else:62            lh = self._left.hash if self._left else ''63            rh = self._right.hash if self._right else ''64            self._hash = sha256(bytes(lh + rh, 'utf-8')).hexdigest()65    def is_leaf(self):66        return self._data is not None67    @property68    def data(self):69        return self._data70    71    @data.setter72    def data(self, value):73        self._data = value74        self._compute_hash()75    @property76    def left(self):77        return self._left78    @left.setter79    def left(self, value):80        self._left = value81        self._compute_hash()82    @property83    def right(self):84        return self._right85    @right.setter86    def right(self, value):87        self._right = value88        self._compute_hash()89    @property90    def hash(self):91        return self._hash92    def __str__(self):93        return '<Node(hash={}, data={})>'.format(self.hash, self._data)...

hash_tree.py

Source:hash_tree.py

...18        if _compute_root_hash(self.divs) == self.root_hash:19            return []20        diffs = []21        for div in self.divs:22            div_hash = _compute_hash(div)23            if not div_hash in self.hashes:24                diffs.append(div)        25        return diffs26    def update(self):27        self.hashes = set()28        for div in self.divs:29            self.hashes.add(_compute_hash(div))30        self.root_hash = _compute_root_hash(self.divs)31        json_string = json.dumps({'root_hash': self.root_hash, 'hashes': list(self.hashes)}, indent=4)32        file = open(HASHES_FILE, 'w')33        file.write(json_string)34        file.close()35def _compute_hash(div):36    identifier = div.find("a", class_="internal-link")['href']37    hash = hashlib.sha256(identifier.encode('ascii')).hexdigest()38    return hash39def _compute_root_hash(divs):40    div_hashes = []41    for div in divs:42        div_hashes.append(_compute_hash(div))...

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