From a61f03cfbf62eb006e6bd845694f18d40101d4e8 Mon Sep 17 00:00:00 2001
From: alekseiplusplus <alekseijeaves@protonmail.com>
Date: Sat, 29 Jun 2024 20:27:11 +1000
Subject: Added cache

---
 README         |  5 +++++
 configure.tcl  |  6 ++++++
 http-cache.tcl | 35 +++++++++++++++++++++++++++++++++++
 http.tcl       | 14 ++++++++------
 4 files changed, 54 insertions(+), 6 deletions(-)
 create mode 100755 http-cache.tcl

diff --git a/README b/README
index b56a36b..126d1a4 100755
--- a/README
+++ b/README
@@ -4,3 +4,8 @@ It has currently only implemented what is necessary to serve GET requests, becau
 Configuration is performed with the configure.tcl file, the others should not need to be touched.
 - for now, perhaps later we can do a simple config file
 - You can configure it to hook into Tcl
+
+Todo:
+- Will create some modules that go along with this
+   - Textboard
+   - Text File Display
\ No newline at end of file
diff --git a/configure.tcl b/configure.tcl
index 717a59d..5691763 100755
--- a/configure.tcl
+++ b/configure.tcl
@@ -8,6 +8,12 @@ namespace eval http {
 	#  A proc 'main' which is what the server will execute to get information.
 	#  A list $targets which have all the valid targets.
     variable hook_namespace {}
+
+	namespace eval cache {
+		variable precache {
+			{/fonts/}
+		}
+	}
 }
 
 
diff --git a/http-cache.tcl b/http-cache.tcl
new file mode 100755
index 0000000..25e5f0d
--- /dev/null
+++ b/http-cache.tcl
@@ -0,0 +1,35 @@
+namespace eval cache {
+
+    # Dictionary containing filename and contents pairs.
+    variable cache {};
+    
+    proc hit {filename} {
+		variable cache
+		return [dict exists $cache $filename]
+	}
+
+	proc get {filename} {
+		variable cache
+		return [dict get $cache $filename]
+	}
+
+    proc add {filename} {
+		variable cache
+		set file [open $filename]
+		fconfigure $file -translation binary
+		dict append cache $filename [read $file]
+    }
+
+    proc remove {filename} {
+		variable cache
+		if [dict exists $cache $filename] {
+			set cache [dict remove $cache $filename]
+		}
+    }
+
+	#TODO: Pre-cache all precache files.
+	foreach i $precache {
+		add [string cat $::http::root $i]
+	}
+
+}
diff --git a/http.tcl b/http.tcl
index 68cb163..307aebf 100755
--- a/http.tcl
+++ b/http.tcl
@@ -103,13 +103,15 @@ namespace eval http {
 
 	# Sends an opened file or cached file.
 	proc send-file {channel filename} {
-		#TODO: configure it to try the cache.
-		#TODO: configure channels to use binary translation if content type is not text/*
-		set file [open $filename]
-		fconfigure $file    -translation binary
 		fconfigure $channel -translation binary
-		fcopy $file $channel
-		close $file
+		if [cache::hit $filename] {
+			puts $channel [cache::get $filename]
+		} else {
+			set file [open $filename]
+			fconfigure $file -translation binary
+			fcopy $file $channel
+			close $file
+		}
 	}
 	
 	## Header
-- 
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