First implementation of NTNet Software Downloads, Fixes

- As usual, fixes various issues through the code, but likely creates more as this is still WIP project.
- Most importantly, NTNet software downloader program now exists and more or less works.
- Your device's connectivity has effect on how quickly you can download. Right now, things with wired connection (consoles) download at 0,5GQ/s, mobile devices on station where signal is good at 0,1GQ/s and mobile devices off station where signal is bad are limited to 0,025GQ/s. This is all controlled by three defines.

code/modules/modular_computers/NTNet/NTNet.dm

@@ -4,6 +4,14 @@ var/global/datum/ntnet/ntnet_global = new()
 // This is the NTNet datum. There can be only one NTNet datum in game at once. Modular computers read data from this.
 /datum/ntnet/
 	var/list/relays = list()
+	var/list/logs = list()
+	var/list/available_station_software = list()
+	var/list/available_antag_software = list()
+
+	// Amount of logs the system tries to keep in memory. Keep below 999 to prevent byond from acting weirdly.
+	// High values make displaying logs much laggier.
+	var/setting_maxlogcount = 100
+
 	var/setting_softwaredownload = 1
 	var/setting_peertopeer = 1
 	var/setting_communication = 1
@@ -17,7 +25,28 @@ var/global/datum/ntnet/ntnet_global = new()
 	for(var/obj/machinery/ntnet_relay/R in machines)
 		relays.Add(R)
 		R.NTNet = src
+	build_software_lists()
+	add_log("NTNet logging system activated.")
 
+// Simplified logging: Adds a log. log_string is mandatory parameter, source is optional.
+/datum/ntnet/proc/add_log(var/log_string, var/datum/computer_hardware/network_card/source = null)
+	var/log_text = "[worldtime2text()] - "
+	if(source)
+		log_text += "[source.get_network_tag()] - "
+	else
+		log_text += " *SYSTEM* - "
+	log_text += log_string
+	logs.Add(log_text)
+
+	if(logs.len > setting_maxlogcount)
+		// We have too many logs, remove the oldest entries until we get into the limit
+		for(var/L in logs)
+			if(logs.len > setting_maxlogcount)
+				logs.Remove(L)
+			else
+				break
+
+// Checks whether NTNet operates. If parameter is passed checks whether specific function is enabled.
 /datum/ntnet/proc/check_function(var/specific_action = 0)
 	if(!relays || !relays.len) // No relays found. NTNet is down
 		return 0
@@ -38,4 +67,41 @@ var/global/datum/ntnet/ntnet_global = new()
 		return (operating && setting_communication)
 	if(specific_action == NTNET_SYSTEMCONTROL)
 		return (operating && setting_systemcontrol)
-	return operating
+	return operating
+
+// Builds lists that contain downloadable software.
+/datum/ntnet/proc/build_software_lists()
+	available_station_software = list()
+	available_antag_software = list()
+	for(var/F in typesof(/datum/computer_file/program))
+		var/datum/computer_file/program/prog = new F
+		// Invalid type (shouldn't be possible but just in case), invalid filetype (not executable program) or invalid filename (unset program)
+		if(!prog || !istype(prog) || prog.filename == "UnknownProgram" || prog.filetype != "PRG")
+			continue
+		// Check whether the program should be available for station/antag download, if yes, add it to lists.
+		if(prog.available_on_ntnet)
+			available_station_software.Add(prog)
+		if(prog.available_on_syndinet)
+			available_antag_software.Add(prog)
+
+// Attempts to find a downloadable file according to filename var
+/datum/ntnet/proc/find_ntnet_file_by_name(var/filename)
+	for(var/datum/computer_file/program/P in available_station_software)
+		if(filename == P.filename)
+			return P
+	for(var/datum/computer_file/program/P in available_antag_software)
+		if(filename == P.filename)
+			return P
+
+
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code/modules/modular_computers/NTNet/NTNet_relay.dm

@@ -7,7 +7,7 @@
 	icon_state = "bus"
 	anchored = 1
 	density = 1
-	var/NTNet = null // This is mostly for backwards reference and to allow varedit modifications from ingame.
+	var/datum/ntnet/NTNet = null // This is mostly for backwards reference and to allow varedit modifications from ingame.
 
 // TODO: Implement more logic here. For now it's only a placeholder.
 /obj/machinery/ntnet_relay/proc/is_operational()
@@ -19,10 +19,12 @@
 	if(ntnet_global)
 		ntnet_global.relays.Add(src)
 		NTNet = ntnet_global
+		ntnet_global.add_log("New quantum relay activated. Current amount of linked relays: [NTNet.relays.len]")
 	..()
 
 /obj/machinery/ntnet_relay/Destroy()
 	if(ntnet_global)
 		ntnet_global.relays.Remove(src)
+		ntnet_global.add_log("Quantum relay connection severed. Current amount of linked relays: [NTNet.relays.len]")
 		NTNet = null
 	..()