forked from STI/Astroport.ONE
101 lines
3.6 KiB
Python
101 lines
3.6 KiB
Python
# Copyright 2014-2024 Vincent Texier <vit@free.fr>
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#
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# DuniterPy is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# DuniterPy is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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import json
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import pathlib
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from ..documents import Block
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CHUNK_SIZE = 250
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DEFAULT_PATH = ".config/duniter/duniter_default/g1/"
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class JsonBlockchain:
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def __init__(self, folder):
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self.folder = folder # folder where chunks are stored
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# number of files starting with "chunk_"
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self.chunks = len(list(folder.glob("chunk_*")))
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# number from 0 to 249 equal to current_block // current_chunk
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self.current_block_in_chunk = 0
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self.current_chunk = 0 # current chunk number
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self.chunk = [] # parsed json for current chunk (length = 250)
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self.parsechunk() # parse first chunk
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def parsechunk(self):
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"""parse a json chunk file"""
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with open(
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self.folder.joinpath(
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f"chunk_{str(self.current_chunk)}-{str(CHUNK_SIZE)}.json"
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),
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encoding="utf-8",
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) as f:
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s = f.read()
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p = json.loads(s)
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self.chunk = p["blocks"]
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def __iter__(self):
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return self
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def __next__(self):
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"""
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if current block is outside current chunk, parse next one,
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otherwise, return current block parsed json
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"""
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if self.current_block_in_chunk == CHUNK_SIZE: # block outside chunk
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self.current_block_in_chunk = 0 # reset to next chunk start
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self.current_chunk += 1 # increment current chunk number
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if self.current_chunk >= self.chunks: # outside range
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raise StopIteration()
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self.parsechunk() # parse this chunk
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# increment current block number for next iteration
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self.current_block_in_chunk += 1
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return self.chunk[
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self.current_block_in_chunk - 1
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] # return block (before incrementation)
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def current_block(self):
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"""returns current block as a duniterpy block document"""
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json_block = self.chunk[self.current_block_in_chunk]
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return Block.from_parsed_json(json_block)
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def get_block_number(self, number):
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"""get one precise block (do not use for iteration)"""
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self.current_chunk = number // CHUNK_SIZE
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self.current_block_in_chunk = number % CHUNK_SIZE
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self.parsechunk()
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return self.current_block()
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def Blockchain(json_blockchain):
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"""convert json to duniterpy block document"""
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jbc = json_blockchain
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for jb in jbc:
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yield Block.from_parsed_json(jb)
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def load_json(path=DEFAULT_PATH):
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"""returns a JsonBlockchain object"""
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path = pathlib.Path("~").joinpath(path).expanduser() # expand path
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jbc = JsonBlockchain(path) # gets an iterator over json blockchain
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return jbc
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def load(path=DEFAULT_PATH):
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"""returns an iterator allowing to browse all the blockchain
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in practice, it will load chunk by chunk and only keep one in memory at a time"""
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jbc = load_json(path)
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bc = Blockchain(jbc) # convert it to an iterator over blocks
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return bc # returns
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