From acba52786c47552c3fee64684814820ec7c9c784 Mon Sep 17 00:00:00 2001
From: Vivek Teegalapally <vivek.teega@gmail.com>
Date: Wed, 11 Jul 2018 19:58:10 +0530
Subject: [PATCH] Adding a new class FLO in coins.py and writing new functions
 in tx.py to deserialize FLO's transactions

---
 electrumx/lib/coins.py | 19 ++++++++++
 electrumx/lib/tx.py    | 78 +++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 96 insertions(+), 1 deletion(-)

diff --git a/electrumx/lib/coins.py b/electrumx/lib/coins.py
index ba88616..e8c1412 100644
--- a/electrumx/lib/coins.py
+++ b/electrumx/lib/coins.py
@@ -1897,3 +1897,22 @@ class Monoeci(Coin):
                 '''Given a header return the hash.'''
                 import x11_hash
                 return x11_hash.getPoWHash(header)
+
+class Flo(Coin):
+    NAME = "Flo"
+    SHORTNAME = "FLO"
+    NET = "mainnet"
+    XPUB_VERBYTES = bytes.fromhex("0134406b")
+    XPRV_VERBYTES = bytes.fromhex("01343c31")
+    P2PKH_VERBYTE = bytes.fromhex("23")
+    P2SH_VERBYTES = [bytes.fromhex("08")]
+    WIF_BYTE = bytes.fromhex("b0")
+    GENESIS_HASH = ('09c7781c9df90708e278c35d38ea5c9041d7ecfcdd1c56ba67274b7cff3e1cea')
+    TX_COUNT = 8908766
+    TX_COUNT_HEIGHT = 1105256
+    TX_PER_BLOCK = 10
+    RPC_PORT = 7313
+    REORG_LIMIT = 800
+    PEERS = [
+    ]
+    DESERIALIZER = lib_tx.DeserializerFlo
diff --git a/electrumx/lib/tx.py b/electrumx/lib/tx.py
index 3db331b..7a0fff5 100644
--- a/electrumx/lib/tx.py
+++ b/electrumx/lib/tx.py
@@ -402,6 +402,82 @@ class DeserializerTxTimeAuxPow(DeserializerTxTime):
         return self._read_nbytes(header_end)
 
 
+class TxFlo(namedtuple("Tx", "version inputs outputs locktime txcomment")):
+    '''Class representing a transaction.'''
+
+    @cachedproperty
+    def is_coinbase(self):
+        return self.inputs[0].is_coinbase
+
+
+class TxFloSegWit(namedtuple("Tx", "version marker flag inputs outputs "
+                                   "witness locktime txcomment")):
+    '''Class representing a SegWit transaction.'''
+
+    @cachedproperty
+    def is_coinbase(self):
+        return self.inputs[0].is_coinbase
+
+
+class DeserializerFlo(DeserializerSegWit):
+
+    # https://bitcoincore.org/en/segwit_wallet_dev/#transaction-serialization
+
+    def _read_tx(self):
+        '''Return a deserialized transaction.'''
+        version = self._read_le_int32()
+        inputs = self._read_inputs()
+        outputs = self._read_outputs()
+        locktime = self._read_le_uint32()
+
+        if version >= 2:
+            comment = self._read_varbytes()
+        else:
+            comment = ""
+
+        return TxFlo(version, inputs, outputs, locktime, comment)
+
+    def _read_tx_parts(self):
+        '''Return a (deserialized TX, tx_hash, vsize) tuple.'''
+        start = self.cursor
+        marker = self.binary[self.cursor + 4]
+        if marker:
+            tx = self._read_tx()
+            tx_hash = double_sha256(self.binary[start:self.cursor])
+            return tx, tx_hash, self.binary_length
+
+        # Ugh, this is nasty.
+        version = self._read_le_int32()
+        orig_ser = self.binary[start:self.cursor]
+
+        marker = self._read_byte()
+        flag = self._read_byte()
+
+        start = self.cursor
+        inputs = self._read_inputs()
+        outputs = self._read_outputs()
+        orig_ser += self.binary[start:self.cursor]
+
+        base_size = self.cursor - start
+        witness = self._read_witness(len(inputs))
+
+        start = self.cursor
+        locktime = self._read_le_uint32()
+
+        # FLO ->
+        if version >= 2:
+            tx_comment = self._read_varbytes()
+        else:
+            tx_comment = ""
+        #  <- FLO
+
+        orig_ser += self.binary[start:self.cursor]
+        vsize = (3 * base_size + self.binary_length) // 4
+
+        return TxFloSegWit(version, marker, flag, inputs, outputs, witness,
+                           locktime, tx_comment), double_sha256(orig_ser), vsize
+
+
 class DeserializerBitcoinAtom(DeserializerSegWit):
     FORK_BLOCK_HEIGHT = 505888
 
@@ -503,7 +579,7 @@ class DeserializerDecred(Deserializer):
         outputs = self._read_outputs()
         locktime = self._read_le_uint32()
         expiry = self._read_le_uint32()
-        no_witness_tx = b'\x01\x00\x01\x00' + self.binary[start+4:self.cursor]
+        no_witness_tx = b'\x01\x00\x01\x00' + self.binary[start + 4:self.cursor]
         witness = self._read_witness(len(inputs))
         return TxDcr(
             version,