From 487e92711628885d0df6f95dbf3a57d0f777f67c Mon Sep 17 00:00:00 2001
From: Christian Decker <decker.christian@gmail.com>
Date: Thu, 3 Dec 2020 12:47:43 +0100
Subject: [PATCH] historian: Make the GossipStream seekable

---
 historian/cli/common.py | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/historian/cli/common.py b/historian/cli/common.py
index 4e695ad..3c0a029 100644
--- a/historian/cli/common.py
+++ b/historian/cli/common.py
@@ -57,6 +57,21 @@ class GossipStream:
         assert header[:3] == b"GSP"
         assert header[3] == 1
 
+    def seek(self, offset):
+        """Allow skipping to a specific point in the stream.
+
+        The offset is denoted in bytes from the start, including the
+        header, and matches the value of f.tell()
+        """
+        self.stream.seek(offset, io.SEEK_SET)
+
+    def tell(self):
+        """Returns the absolute position in the stream.
+
+        Includes the header, and matches f.seek()
+        """
+        return self.stream.tell()
+
     def __iter__(self):
         return self