# HG changeset patch
# User Dennis Concepcion Martin <dennisconcepcionmartin@gmail.com>
# Date 1636540664 -3600
# Node ID 905b6fdc5e1b34d70e51c91ff495969e170e804d
# Parent  d1f527020d5457458904134195b8478a6dc6d306
handle invalid magic bytes

diff -r d1f527020d54 -r 905b6fdc5e1b Dockerfile
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Dockerfile	Wed Nov 10 11:37:44 2021 +0100
@@ -0,0 +1,16 @@
+# syntax=docker/dockerfile:1
+
+# Install Python image
+FROM python:3.8-slim-buster
+
+# Create working directory and install dependencies
+WORKDIR /app
+COPY requirements.txt requirements.txt
+RUN pip3 install -r requirements.txt
+
+# Copy files
+COPY src/bitcaviar_plus bitcaviar_plus/
+COPY tests/test_app.py .
+
+# Run script
+CMD ["python3", "-u", "test_app.py"]
\ No newline at end of file
diff -r d1f527020d54 -r 905b6fdc5e1b README.md
--- a/README.md	Thu Nov 04 10:31:29 2021 +0100
+++ b/README.md	Wed Nov 10 11:37:44 2021 +0100
@@ -1,3 +1,4 @@
+<!--suppress HtmlDeprecatedAttribute, HtmlRequiredAltAttribute -->
 <p align="center">
   <img src="https://user-images.githubusercontent.com/66180929/136657868-0ec6971b-ed76-43f3-9689-f643e8893706.png" />
 </p>
diff -r d1f527020d54 -r 905b6fdc5e1b src/bitcaviar_plus/block.py
--- a/src/bitcaviar_plus/block.py	Thu Nov 04 10:31:29 2021 +0100
+++ b/src/bitcaviar_plus/block.py	Wed Nov 10 11:37:44 2021 +0100
@@ -1,6 +1,7 @@
 from bitcaviar_plus.block_structure import *
 from bitcaviar_plus.helpers import __get_var_int
 from bitcaviar_plus.helpers import __compute_hash
+from bitcaviar_plus.errors import InvalidMagicBytes
 
 """
 Deserialize methods
@@ -16,6 +17,10 @@
 
     block = Block()
     block.magic_number = f.read(4).hex()
+
+    if block.magic_number != 'f9beb4d9':
+        raise InvalidMagicBytes(block.magic_number)
+
     block.size = f.read(4)[::-1].hex()
     block_header, block.id = __deserialize_header(f)
     block.transaction_count = __get_var_int(f)
diff -r d1f527020d54 -r 905b6fdc5e1b src/bitcaviar_plus/errors.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/bitcaviar_plus/errors.py	Wed Nov 10 11:37:44 2021 +0100
@@ -0,0 +1,9 @@
+# noinspection PyCompatibility
+class InvalidMagicBytes(Exception):
+    """
+    Exception when magic bytes are different from 'f9beb4d9'
+    """
+
+    def __init__(self, magic_bytes):
+        self.message = 'Invalid magic bytes: {}'.format(magic_bytes)
+        super().__init__(self.message)
diff -r d1f527020d54 -r 905b6fdc5e1b tests/test_app.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/test_app.py	Wed Nov 10 11:37:44 2021 +0100
@@ -0,0 +1,19 @@
+import os
+from bitcaviar_plus.block import deserialize_block
+from bitcaviar_plus.errors import InvalidMagicBytes
+
+
+def parse_genesis_block():
+    blk_path = '/bitcoin-node/.bitcoin/blocks/blk00355.dat'
+
+    with open(blk_path, 'rb') as f:
+        file_size = os.path.getsize(blk_path)
+        while f.tell() < file_size:
+            try:
+                block = deserialize_block(f)
+            except InvalidMagicBytes as e:
+                print(e)
+
+
+if __name__ == '__main__':
+    parse_genesis_block()