From b76453a12317031787b6d03fb56c7cb624ac11a5 Mon Sep 17 00:00:00 2001
From: Philippe PITTOLI <karchnu@karchnu.fr>
Date: Fri, 28 Jun 2024 17:53:27 +0200
Subject: [PATCH] Proxy: removing keepalive messages, and some code split.

---
 src/ipcproxy.cr | 42 +++++++++++++++++++++++++++++++++---------
 1 file changed, 33 insertions(+), 9 deletions(-)

diff --git a/src/ipcproxy.cr b/src/ipcproxy.cr
index 67a917f..9c51e1e 100644
--- a/src/ipcproxy.cr
+++ b/src/ipcproxy.cr
@@ -12,6 +12,7 @@ module IPCProxy
 		@@proxy_name      = ARGV[1] if ARGV.size >= 2
 
 		puts "proxy named #{@@proxy_name} for service #{@@proxied_service}"
+		puts "removing keepalive messages"
 
 		ipc_proxy = IPC.new()
 		ipc_proxy.service_init @@proxy_name
@@ -66,36 +67,59 @@ module IPCProxy
 	end
 end
 
-def fn_input(fd : LibC::Int, buffer : LibC::Char*, buflen : LibC::UInt64T*) : LibC::Char
+def read_input(fd : LibC::Int, buffer : LibC::Char*, buflen : LibC::UInt64T*) : LibC::Char
 	io = IO::FileDescriptor.new fd, close_on_finalize: false
 	slice = Bytes.new buffer, buflen.value
 	len = io.read slice
 	buflen.value = len.to_u64
 	return 2_u8 if (len == 0)
 
-	hexa = Hexa.new 50_000
-	bytes = Bytes.new buffer, buflen.value
-	puts hexa.dump "message received from #{fd}", bytes
-
 	0_u8
 rescue e
-	puts "fn_input exception! #{e}"
+	puts "read_input exception! #{e}"
 	1_u8
 end
 
-def fn_output(fd : LibC::Int, buffer : LibC::Char*, buflen : LibC::UInt64T)  : LibC::Char
+def keepalive?(buffer : LibC::Char*) : Bool
+	return (buffer[4] == 250)
+end
+
+def print_hexa(buffer : LibC::Char*, buflen : LibC::UInt64T, title : String)
 	hexa = Hexa.new 50_000
 	bytes = Bytes.new buffer, buflen
-	puts hexa.dump "message to send to #{fd}", bytes
+	puts hexa.dump title, bytes
+end
 
+def fn_input(fd : LibC::Int, buffer : LibC::Char*, buflen : LibC::UInt64T*) : LibC::Char
+	# First, get the content.
+	ret = read_input fd, buffer, buflen
+	return ret if ret != 0
+
+	# Second, is this a keepalive message?
+	return ret if keepalive? buffer
+
+	# Finally, print an hexadecimal presentation of the content.
+	print_hexa buffer, buflen.value, "message received from #{fd}"
+
+	ret
+end
+
+def write_output(fd : LibC::Int, buffer : LibC::Char*, buflen : LibC::UInt64T) : LibC::Char
 	slice = Bytes.new buffer, buflen
 	io = IO::FileDescriptor.new fd, close_on_finalize: false
 	io.write slice
 	io.flush
 	0_u8
 rescue e
-	puts "fn_output exception! #{e}"
+	puts "write_output exception! #{e}"
 	1_u8
 end
 
+def fn_output(fd : LibC::Int, buffer : LibC::Char*, buflen : LibC::UInt64T) : LibC::Char
+	unless keepalive? buffer
+		print_hexa buffer, buflen, "message to send to #{fd}"
+	end
+	write_output fd, buffer, buflen
+end
+
 IPCProxy.start