luci-base: move some generic classes into a separate luci-base-libs package

The new package luci-base-libs provides the modules that not strictly relate
to the web-interface of luci. By separating these libs they can be used by
other packages without having to install the web-components.
This change was inspired by providing a shell-only interface for 4MB-flash
devices, by keeping as much code common with a full install.

Signed-off-by: Sven Roederer <freifunk@it-solutions.geroedel.de>

1 files changed, 37 insertions, 0 deletions

diff --git a/libs/luci-lib-base/luasrc/debug.lua b/libs/luci-lib-base/luasrc/debug.lua
new file mode 100644
index 000000000..8ff1bb698
--- /dev/null
+++ b/libs/luci-lib-base/luasrc/debug.lua
@@ -0,0 +1,37 @@
+local debug = require "debug"
+local io = require "io"
+local collectgarbage, floor = collectgarbage, math.floor
+
+module "luci.debug"
+__file__ = debug.getinfo(1, 'S').source:sub(2)
+
+-- Enables the memory tracer with given flags and returns a function to disable the tracer again
+function trap_memtrace(flags, dest)
+	flags = flags or "clr"
+	local tracefile = io.open(dest or "/tmp/memtrace", "w")
+	local peak = 0
+
+	local function trap(what, line)
+		local info = debug.getinfo(2, "Sn")
+		local size = floor(collectgarbage("count"))
+		if size > peak then
+			peak = size
+		end
+		if tracefile then
+			tracefile:write(
+				"[", what, "] ", info.source, ":", (line or "?"), "\t",
+				(info.namewhat or ""), "\t",
+				(info.name or ""), "\t",
+				size, " (", peak, ")\n"
+			)
+		end
+	end
+
+	debug.sethook(trap, flags)
+
+	return function()
+		debug.sethook()
+		tracefile:close()
+	end
+end
+