def on_block()

in craft-server-image/server-ddb.py [0:0]


    def on_block(self, client, x, y, z, w):
        log('on_block','x='+str(x)+'y='+str(y)+'z='+str(z)+'w='+str(w))
        x, y, z, w = map(int, (x, y, z, w))
        p, q = chunked(x), chunked(z)
        previous = self.get_block(x, y, z)
        message = None
        if AUTH_REQUIRED and client.user_id is None:
            message = 'Only logged in users are allowed to build.'
        elif y <= 0 or y > 255:
            message = 'Invalid block coordinates.'
        elif w not in ALLOWED_ITEMS:
            message = 'That item is not allowed.'
        elif w and previous:
            message = 'Cannot create blocks in a non-empty space.'
        elif not w and not previous:
            message = 'That space is already empty.'
        elif previous in INDESTRUCTIBLE_ITEMS:
            message = 'Cannot destroy that type of block.'
        if message is not None:
            client.send(BLOCK, p, q, x, y, z, previous)
            client.send(REDRAW, p, q)
            client.send(TALK, message)
            return
        query = (
            'insert into block_history (timestamp, user_id, x, y, z, w) '
            'values (:timestamp, :user_id, :x, :y, :z, :w);'
        )
        if RECORD_HISTORY:
            self.execute(query, dict(timestamp=time.time(),
                user_id=client.user_id, x=x, y=y, z=z, w=w))
        query = (
            'insert or replace into block (p, q, x, y, z, w) '
            'values (:p, :q, :x, :y, :z, :w);'
        )
        log('insert into sqlite',str(p)+' '+str(q)+' '+str(x)+' '+str(y)+' '+str(z)+' '+str(w))
        self.execute(query, dict(p=p, q=q, x=x, y=y, z=z, w=w))
        self.send_block(client, p, q, x, y, z, w)
        #ddb
        log('insert into ddb',str(p)+' '+str(q)+' '+str(x)+' '+str(y)+' '+str(z)+' '+str(w))
        execute_ddb_put_item(dynamodb_client, create_ddb_put_item('Block',str(p), str(q), str(x), str(y), str(z), str(w)))
        for dx in range(-1, 2):
            for dz in range(-1, 2):
                if dx == 0 and dz == 0:
                    continue
                if dx and chunked(x + dx) == p:
                    continue
                if dz and chunked(z + dz) == q:
                    continue
                np, nq = p + dx, q + dz
                self.execute(query, dict(p=np, q=nq, x=x, y=y, z=z, w=-w))
                self.send_block(client, np, nq, x, y, z, -w)
        if w == 0:
            query = (
                'delete from sign where '
                'x = :x and y = :y and z = :z;'
            )
            self.execute(query, dict(x=x, y=y, z=z))
            query = (
                'update light set w = 0 where '
                'x = :x and y = :y and z = :z;'
           )
            self.execute(query, dict(x=x, y=y, z=z))