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494 lines
15 KiB
Python
494 lines
15 KiB
Python
# Copyright (c) 2014-2017 esotericnonsense (Daniel Edgecumbe)
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# Distributed under the MIT software license, see the accompanying
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# file COPYING or https://opensource.org/licenses/mit-license.php
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import datetime
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# import math
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import curses
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import asyncio
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# from decimal import Decimal
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import view
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from util import isoformatseconds
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class BlockStore(object):
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def __init__(self, client):
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self._client = client
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self._lock = asyncio.Lock()
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self._blocks = {} # hash -> raw block (full details)
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self._bestblockhash = None
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async def get_block(self, blockhash):
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with await self._lock:
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try:
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return self._blocks[blockhash]
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except KeyError:
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# TODO: handle error if the block doesn't exist at all.
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j = await self._client.request("getblock", [blockhash])
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self._blocks[blockhash] = j["result"]
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return j["result"]
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async def get_blockhash(self, height):
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# Direct RPC call.
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j = await self._client.request("getblockhash", [height])
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return j["result"]
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async def get_previousblockhash(self, blockhash):
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with await self._lock:
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try:
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return self._blocks[blockhash]["previousblockhash"]
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except KeyError:
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raise
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async def get_nextblockhash(self, blockhash):
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with await self._lock:
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try:
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return self._blocks[blockhash]["nextblockhash"]
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except KeyError:
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raise
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async def get_previousblockhash_n(self, blockhash, n):
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if n <= 0:
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raise TypeError
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# This is based on height.
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with await self._lock:
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try:
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block = self._blocks[blockhash]
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except KeyError:
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raise
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if block["height"] < n:
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raise KeyError
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j = await self._client.request("getblockhash", [block["height"] - n])
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try:
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return j["result"]
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except KeyError:
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raise
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async def get_nextblockhash_n(self, blockhash, n):
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if n <= 0:
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raise TypeError
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# This is based on height.
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with await self._lock:
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try:
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block = self._blocks[blockhash]
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except KeyError:
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raise
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try:
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bestblock = self._blocks[self._bestblockhash]
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except KeyError:
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raise
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if bestblock["height"] - block["height"] < n:
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raise KeyError
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j = await self._client.request("getblockhash", [block["height"] + n])
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try:
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return j["result"]
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except KeyError:
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raise
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async def on_bestblockhash(self, blockhash):
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with await self._lock:
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self._bestblockhash = blockhash
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# Pre-fetch it if necessary and update the previous block
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# TODO: think about the locking here.
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block = await self.get_block(blockhash)
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with await self._lock:
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try:
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prevblock = self._blocks[block["previousblockhash"]]
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except KeyError:
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return
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if "nextblockhash" in prevblock:
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if prevblock["nextblockhash"] == blockhash:
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return
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raise Exception("BlockStore does not handle re-orgs")
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prevblock["nextblockhash"] = blockhash
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async def get_bestblockhash(self):
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with await self._lock:
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if self._bestblockhash is None:
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raise KeyError
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return self._bestblockhash
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class BlockView(view.View):
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_mode_name = "block"
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def __init__(self, blockstore, txidsetter, modesetter):
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self._blockstore = blockstore
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self._txidsetter = txidsetter
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self._modesetter = modesetter
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self._edit_mode = False # Are we in edit mode?
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self._edit_buffer = ""
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self._hash = None # currently browsed hash.
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self._selected_tx = None # (index, blockhash)
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self._tx_offset = None # (offset, blockhash)
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super().__init__()
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async def _set_hash(self, newhash):
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# TODO: lock?
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self._hash = newhash
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self._selected_tx = (0, newhash)
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self._tx_offset = (0, newhash)
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async def _draw_block(self, block, bestblockhash):
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CGREEN = curses.color_pair(1)
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CRED = curses.color_pair(3)
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CYELLOW = curses.color_pair(5)
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CBOLD = curses.A_BOLD
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self._pad.addstr(0, 46, "[J/K: browse, HOME/END: quicker, L: best, TAB: manual]", CYELLOW)
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self._pad.addstr(0, 1, "Time {}".format(
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isoformatseconds(datetime.datetime.utcfromtimestamp(block["time"]))
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), CBOLD)
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self._pad.addstr(0, 31, "Height {}".format(block["height"]), CBOLD)
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self._pad.addstr(1, 1, "Size {} bytes".format(block["size"]), CBOLD)
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self._pad.addstr(2, 1, "Weight {} WU".format(block["weight"]), CBOLD)
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self._pad.addstr(3, 1, "Diff {:,d}".format(int(block["difficulty"])), CBOLD)
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self._pad.addstr(4, 1, "Version 0x{}".format(block["versionHex"]), CBOLD)
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self._pad.addstr(1, 31, "Hash {}".format(block["hash"]), CBOLD)
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if "previousblockhash" in block:
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self._pad.addstr(2, 31, "Prev {}".format(block["previousblockhash"]), CBOLD)
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else:
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self._pad.addstr(2, 60, "genesis block!", CBOLD + CRED)
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if "nextblockhash" in block:
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self._pad.addstr(3, 31, "Next {}".format(block["nextblockhash"]), CBOLD)
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elif block["hash"] == bestblockhash:
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self._pad.addstr(3, 60, "best block!", CBOLD + CGREEN)
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self._pad.addstr(4, 31, "Root {}".format(block["merkleroot"]), CBOLD)
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async def _draw_transactions(self, block, bestblockhash):
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CGREEN = curses.color_pair(1)
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CRED = curses.color_pair(3)
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CYELLOW = curses.color_pair(5)
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CBOLD = curses.A_BOLD
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CREVERSE = curses.A_REVERSE
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self._pad.addstr(6, 36, "Transactions: {}".format(
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len(block["tx"])), CBOLD)
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self._pad.addstr(6, 68, "[UP/DOWN: browse, ENTER: select]", CYELLOW)
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if self._selected_tx is None or self._tx_offset is None:
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# Shouldn't happen
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raise Exception
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if self._selected_tx[1] != block["hash"] or self._tx_offset[1] != block["hash"]:
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# Shouldn't happen
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raise Exception
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offset = self._tx_offset[0]
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if offset > 0:
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self._pad.addstr(7, 36, "... ^ ...", CBOLD)
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if offset < len(block["tx"]) - 11:
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self._pad.addstr(19, 36, "... v ...", CBOLD)
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for i, txid in enumerate(block["tx"]):
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if i < offset: # this is lazy
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continue
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if i > offset+10: # this is lazy
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break
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if i == self._selected_tx[0] and self._hash == self._selected_tx[1]:
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self._pad.addstr(8+i-offset, 36, "{}".format(txid), CBOLD + CREVERSE)
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else:
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self._pad.addstr(8+i-offset, 36, "{}".format(txid))
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async def _draw_edit_mode(self):
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CGREEN = curses.color_pair(1)
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CRED = curses.color_pair(3)
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CYELLOW = curses.color_pair(5)
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CBOLD = curses.A_BOLD
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CREVERSE = curses.A_REVERSE
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oy, ox = (20-6)//2, (100-70)//2
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self._pad.addstr(oy, ox, " " * 70, CGREEN + CREVERSE)
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self._pad.addstr(oy+6, ox, " " * 70, CGREEN + CREVERSE)
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for i in range(5):
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self._pad.addstr(oy+1+i, ox, " ", CGREEN + CREVERSE)
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self._pad.addstr(oy+1+i, ox+69, " ", CGREEN + CREVERSE)
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self._pad.addstr(oy+2, ox+2, "enter a block height or hash", CBOLD)
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self._pad.addstr(oy+2, ox+53, "[ENTER: search]", CYELLOW)
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self._pad.addstr(oy+4, ox+2, "> {}".format(self._edit_buffer),
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CRED + CBOLD + CREVERSE if self._edit_mode else 0)
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async def _submit_edit_buffer(self):
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buf = self._edit_buffer
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if len(buf) == 0:
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return
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if len(buf) < 8 and buf.isdigit():
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blockhash = await self._blockstore.get_blockhash(int(buf))
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self._edit_mode = False
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self._edit_buffer = ""
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await self._set_hash(blockhash)
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await self._draw_if_visible()
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return
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if len(buf) == 64:
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try:
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int(buf, 16)
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except ValueError:
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# Note that it's invalid somehow
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return
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self._edit_mode = False
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self._edit_buffer = ""
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await self._set_hash(buf)
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await self._draw_if_visible()
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return
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# Note that it's invalid somehow
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return
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async def _draw(self):
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self._clear_init_pad()
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if self._edit_mode:
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await self._draw_edit_mode()
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else:
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block = None
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bestblockhash = None
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if self._hash:
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block = await self._blockstore.get_block(self._hash)
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bestblockhash = await self._blockstore.get_bestblockhash()
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if block:
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await self._draw_block(block, bestblockhash)
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await self._draw_transactions(block, bestblockhash)
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self._draw_pad_to_screen()
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async def _select_previous_transaction(self):
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if self._hash is None:
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return # Can't do anything
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if self._selected_tx == None or self._selected_tx[1] != self._hash:
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return # Can't do anything
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if self._tx_offset == None or self._tx_offset[1] != self._hash:
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return # Can't do anything
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if self._selected_tx[0] == 0:
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return # At the beginning already.
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if self._selected_tx[0] == self._tx_offset[0]:
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self._tx_offset = (self._tx_offset[0] - 1, self._tx_offset[1])
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self._selected_tx = (self._selected_tx[0] - 1, self._selected_tx[1])
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await self._draw_if_visible()
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async def _select_next_transaction(self):
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if self._hash is None:
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return # Can't do anything
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if self._selected_tx == None or self._selected_tx[1] != self._hash:
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return # Can't do anything
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if self._tx_offset == None or self._tx_offset[1] != self._hash:
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return # Can't do anything
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try:
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block = await self._blockstore.get_block(self._hash)
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except KeyError:
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return # Can't do anything
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if self._selected_tx[0] == len(block["tx"]) - 1:
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return # At the end already
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if self._selected_tx[0] == self._tx_offset[0] + 10:
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self._tx_offset = (self._tx_offset[0] + 1, self._tx_offset[1])
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self._selected_tx = (self._selected_tx[0] + 1, self._selected_tx[1])
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await self._draw_if_visible()
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async def _enter_transaction_view(self):
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if self._hash is None:
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return # Can't do anything
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if self._selected_tx == None or self._selected_tx[1] != self._hash:
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return # Can't do anything
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if self._tx_offset == None or self._tx_offset[1] != self._hash:
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return # This shouldn't matter, but skip anyway
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try:
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block = await self._blockstore.get_block(self._hash)
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except KeyError:
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return # Can't do anything
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txid = block["tx"][self._selected_tx[0]]
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await self._txidsetter(txid)
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await self._modesetter("transaction")
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async def _select_previous_block(self):
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if self._hash is None:
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return # Can't do anything
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try:
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newhash = await self._blockstore.get_previousblockhash(self._hash)
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except KeyError:
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return # Can't do anything
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await self._set_hash(newhash)
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await self._draw_if_visible()
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async def _select_next_block(self):
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if self._hash is None:
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return # Can't do anything
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try:
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newhash = await self._blockstore.get_nextblockhash(self._hash)
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except KeyError:
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return # Can't do anything
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await self._set_hash(newhash)
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await self._draw_if_visible()
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async def _select_previous_block_n(self, n):
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if self._hash is None:
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return # Can't do anything
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try:
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newhash = await self._blockstore.get_previousblockhash_n(self._hash, n)
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except KeyError:
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return # Can't do anything
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await self._set_hash(newhash)
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await self._draw_if_visible()
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async def _select_next_block_n(self, n):
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if self._hash is None:
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return # Can't do anything
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try:
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newhash = await self._blockstore.get_nextblockhash_n(self._hash, n)
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except KeyError:
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return # Can't do anything
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await self._set_hash(newhash)
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await self._draw_if_visible()
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async def _select_best_block(self):
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if self._hash is None:
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return # Can't do anything
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try:
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newhash = await self._blockstore.get_bestblockhash()
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except KeyError:
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return # Can't do anything
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await self._set_hash(newhash)
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await self._draw_if_visible()
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async def on_bestblockhash(self, key, obj):
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try:
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bestblockhash = obj["result"]
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except KeyError:
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return
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await self._blockstore.on_bestblockhash(bestblockhash)
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# If we have no browse hash, set it to the best.
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if self._hash is None:
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newhash = bestblockhash
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await self._set_hash(newhash)
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# Redraw so that we know if it's the best
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await self._draw_if_visible()
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async def handle_keypress(self, key):
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if key == "\t" or key == "KEY_TAB":
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self._edit_mode = not self._edit_mode
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await self._draw_if_visible()
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return None
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if self._edit_mode:
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if (len(key) == 1 and ord(key) == 127) or key == "KEY_BACKSPACE":
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self._edit_buffer = self._edit_buffer[:-1]
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await self._draw_if_visible()
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return None
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elif key == "KEY_RETURN" or key == "\n":
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await self._submit_edit_buffer()
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await self._draw_if_visible()
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return None
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elif len(key) == 1:
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if len(self._edit_buffer) < 64:
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self._edit_buffer += key
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await self._draw_if_visible()
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return None
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else:
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if key.lower() == "j":
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await self._select_previous_block()
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return None
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if key.lower() == "k":
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await self._select_next_block()
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return None
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if key == "KEY_HOME":
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await self._select_previous_block_n(1000)
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return None
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if key == "KEY_END":
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await self._select_next_block_n(1000)
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return None
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if key == "KEY_UP":
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await self._select_previous_transaction()
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return None
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if key == "KEY_DOWN":
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await self._select_next_transaction()
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return None
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if key == "KEY_RETURN" or key == "\n":
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await self._enter_transaction_view()
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return None
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if key.lower() == "l":
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await self._select_best_block()
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return None
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return key
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async def on_mode_change(self, newmode):
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""" Overrides view.View to set the edit mode inactive. """
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if newmode != self._mode_name:
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self._edit_mode = False
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self._visible = False
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return
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self._visible = True
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await self._draw_if_visible()
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