add fetch-from-server api endpoint

Makefile

@@ -126,6 +126,8 @@ define Package/wifibox/install
 	$(INSTALL_BIN) $(WIFIBOX_BASE_DIR)/script/signin.sh $(1)/$(TGT_LUA_DIR_SUFFIX)/script
 	$(CP) $(WIFIBOX_BASE_DIR)/script/logrotate-wifibox.conf $(1)/etc/logrotate.d/wifibox.conf
 	
+	$(LN) -s /$(TGT_LUA_DIR_SUFFIX)/script/print-fetch.lua $(1)/bin/print-fetch
+	
 	$(CP) $(WIFIBOX_BASE_DIR)/script/wifibox.uci.config $(1)/etc/config/wifibox  # copy base configuration to uci config dir
 	$(CP) $(WIFIBOX_BASE_DIR)/FIRMWARE-VERSION $(1)/etc/wifibox-version
 

src/rest/api/api_printer.lua

@@ -185,6 +185,14 @@ local function addSequenceNumbering(printer, response)
 	end
 end
 
+function M.fetch_POST(request, response)
+	local printer,msg = printerUtils.createPrinterOrFail(argId, response)
+	if not printer or not printer:hasSocket() then return end
+
+	local socket = printer:getId()
+	io.popen("print-fetch.lua " .. socket)
+end
+
 --requires: gcode(string) (the gcode to be appended)
 --accepts: id(string) (the printer ID to append to)
 --accepts: clear(bool) (chunks will be concatenated but output file will be cleared first if this argument is true)

src/script/print-fetch.lua

@@ -0,0 +1,56 @@
+#!/usr/bin/lua
+package.cpath = package.cpath .. '/usr/lib/lua/?.so'
+JSON = (loadfile "/usr/share/lua/wifibox/util/JSON.lua")()
+
+local p3d = require("print3d")
+
+local printer = p3d.getPrinter(arg[1])
+
+local remote = "10.0.0.212:8080"
+
+local finished = false
+
+local info = JSON:decode(io.popen("wget -qO - " .. remote .. "/info/"):read("*a"))
+
+local current_line = 0
+local total_lines = tonumber(info["lines"])
+local started = false
+
+while(not finished)
+do
+    local f = io.popen("wget -qO - " .. remote .. "/fetch/" .. current_line)
+    local line = f:read()
+    while line ~= nil do
+        printer:appendGcode(line)
+        current_line = current_line + 1
+        line = f:read()
+    end
+    if current_line > total_lines then
+        finished = true
+        break
+    end
+
+    if not started then
+	started = true
+	print("send print start command")
+        printer:startPrint()
+    end
+
+    local accepts_new_gcode = false
+
+    while (not accepts_new_gcode)
+    do
+	local current,buffer,total,bufferSize,maxBufferSize = printer:getProgress()
+
+	print("current: " .. current .. " total:" .. total .. " buffer: " .. buffer .. " bufferSize: " .. bufferSize .. " maxBufferSize: " .. maxBufferSize)
+	local percentageBufferSize = bufferSize / maxBufferSize
+
+        if percentageBufferSize < 0.8 then
+	    print("buffer below 80% capacity, sending new gcode")
+            accepts_new_gcode = true
+        else
+	    print("buffer above 80% capacity")
+            os.execute("sleep 10")
+        end
+    end
+end