From b1338ef5d40921f255d67a08371420a5cd838a80 Mon Sep 17 00:00:00 2001
From: Christian Decker <decker.christian@gmail.com>
Date: Sun, 11 Oct 2020 21:57:16 +0200
Subject: [PATCH] historian: Add loading functionality to historian-cli

---
 historian/historian-cli    | 116 +++++++++++++++++++++++++++++++++++++
 historian/requirements.txt |   1 +
 2 files changed, 117 insertions(+)

diff --git a/historian/historian-cli b/historian/historian-cli
index 19fc2bd..d77d204 100755
--- a/historian/historian-cli
+++ b/historian/historian-cli
@@ -1,14 +1,22 @@
 #!/usr/bin/env python3
+from tqdm import tqdm
 from contextlib import contextmanager
 from sqlalchemy import create_engine
 from common import Base, ChannelAnnouncement, ChannelUpdate, NodeAnnouncement
 from sqlalchemy.orm import sessionmaker
 from sqlalchemy import func
 from datetime import datetime, timedelta
+from collections import namedtuple
 import click
 from pyln.proto.primitives import varint_encode, varint_decode
 import os
 from sqlalchemy.orm import load_only
+import re
+import io
+import logging
+import socket
+from pyln.proto import wire
+
 
 default_db = "sqlite:///$HOME/.lightning/bitcoin/historian.sqlite3"
 
@@ -108,6 +116,9 @@ ORDER BY
   a.scid
         """.format(since.strftime("%Y-%m-%d %H:%M:%S")))
 
+        # Write the header now that we know we'll be writing something.
+        destination.write(b"GSP\x01")
+
         chan_count = 0
         last_scid = None
         for scid, cann, u1, u2 in rows:
@@ -170,6 +181,17 @@ def full(ctx, destination, db):
 @snapshot.command()
 @click.argument('snapshot', type=click.File('rb'))
 def read(snapshot):
+    header = snapshot.read(4)
+    if len(header) < 4:
+        raise ValueError("Could not read header")
+
+    tag, version = header[0:3], header[3]
+    if tag != b'GSP':
+        raise ValueError(f"Header mismatch, expected GSP, got {repr(tag)}")
+
+    if version != 1:
+        raise ValueError(f"Unsupported version {version}, only support up to version 1")
+
     while True:
         l = varint_decode(snapshot)
         if l is None:
@@ -182,5 +204,99 @@ def read(snapshot):
         print(msg.hex())
 
 
+LightningAddress = namedtuple('LightningAddress', ['node_id', 'host', 'port'])
+
+
+class LightningAddressParam(click.ParamType):
+    def convert(self, value, param, ctx):
+        m = re.match(r"(0[23][a-fA-F0-9]+)@([a-zA-Z0-9\.:]+):([0-9]+)?", value)
+        if m is None:
+            self.fail(
+                f"{value} isn't a valid lightning connection string, "
+                "expected \"[node_id]@[host]:[port]\""
+            )
+            return
+
+        if len(m.groups()) < 3:
+            return LightningAddress(m[1], m[2], 9735)
+        else:
+            return LightningAddress(m[1], m[2], int(m[3]))
+
+
+class LightningPeer:
+    def __init__(self, node_id: str, address: str, port: int = 9735):
+        self.node_id = node_id
+        self.address = address
+        self.port = port
+        self.connection = None
+        self.local_privkey = wire.PrivateKey(os.urandom(32))
+
+    def connect(self):
+        sock = socket.create_connection((self.address, self.port), timeout=30)
+        self.connection = wire.LightningConnection(
+            sock,
+            remote_pubkey=wire.PublicKey(bytes.fromhex(self.node_id)),
+            local_privkey=self.local_privkey,
+            is_initiator=True,
+        )
+        self.connection.shake()
+
+        # Send an init message, with no global features, and 0b10101010 as
+        # local features.
+        self.connection.send_message(b"\x00\x10\x00\x00\x00\x01\xaa")
+
+    def send(self, packet: bytes) -> None:
+        if self.connection is None:
+            raise ValueError("Not connected to peer")
+
+        logging.debug("Sending {}".format(packet.hex()))
+        self.connection.send_message(packet)
+
+    def send_all(self, packets) -> None:
+        assert self.connection is not None
+        for p in packets:
+            self.send(p)
+
+    def disconnect(self):
+        self.connection.connection.close()
+
+
+def split_gossip(reader: io.BytesIO):
+    while True:
+        length = varint_decode(reader)
+        if length is None:
+            break
+
+        msg = reader.read(length)
+        if len(msg) != length:
+            raise ValueError("Incomplete read at end of file")
+
+        yield msg
+
+
+@snapshot.command()
+@click.argument('snapshot', type=click.File('rb'))
+@click.argument('destination', type=LightningAddressParam())
+def load(snapshot, destination):
+    header = snapshot.read(4)
+    if len(header) < 4:
+        raise ValueError("Could not read header")
+
+    tag, version = header[0:3], header[3]
+    if tag != b'GSP':
+        raise ValueError(f"Header mismatch, expected GSP, got {repr(tag)}")
+
+    if version != 1:
+        raise ValueError(f"Unsupported version {version}, only support up to version 1")
+
+    logging.debug(f"Connecting to {destination}")
+    peer = LightningPeer(destination.node_id, destination.host, destination.port)
+    peer.connect()
+    logging.debug("Connected, streaming messages from snapshot")
+    peer.send_all(tqdm(split_gossip(snapshot)))
+    peer.disconnect()
+    logging.debug("Done streaming messages, disconnecting")
+
+
 if __name__ == "__main__":
     cli()
diff --git a/historian/requirements.txt b/historian/requirements.txt
index 193d289..1a8e63f 100644
--- a/historian/requirements.txt
+++ b/historian/requirements.txt
@@ -1,3 +1,4 @@
 inotify==0.2.10
 sqlalchemy==1.3.17
 pyln-proto
+tqdm