feat: improve performance (chaitin#11)

.luacheckrc

@@ -1,2 +1,6 @@
 std = "ngx_lua"
 redefined = false
+max_line_length = 130
+max_code_line_length = 130
+max_string_line_length = 130
+max_comment_line_length	= 130

lib/resty/t1k/buffer.lua

@@ -2,47 +2,33 @@ local _M = {
     _VERSION = '1.0.0',
 }
 
-function _M:new ()
-    local o = {}
+function _M:new (o)
+    o = o or {}
     setmetatable(o, self)
     self.__index = self
     return o
 end
 
-function _M:add_lf ()
-    self:add("\x0a")
-end
-
-function _M:add_crlf ()
-    self:add("\x0d\x0a")
-end
-
 function _M:add (...)
     for _, v in ipairs({ ... }) do
         table.insert(self, v)
     end
 end
 
-function _M:add_kv_lf (k, v)
-    self:add(k, ":", v)
-    self:add_lf()
+function _M:add_crlf ()
+    self:add("\r\n")
 end
 
 function _M:add_kv_crlf (k, v)
-    self:add(k, ": ", v)
-    self:add_crlf()
-end
-
-function _M:tostring (sep, i, j)
-    return table.concat(self, sep, i, j)
+    self:add(k, ": ", v, "\r\n")
 end
 
 function _M:len()
-    local l = 0
+    local len = 0
     for _, v in ipairs(self) do
-        l = l + #v
+        len = len + #v
     end
-    return l
+    return len
 end
 
 return _M

lib/resty/t1k/file.lua

@@ -1,16 +1,34 @@
+local buffer = require "resty.t1k.buffer"
+
 local _M = {
     _VERSION = '1.0.0'
 }
 
-function _M.read(p)
+local buffer_size = 2 ^ 13
+
+function _M.read(p, size)
+    size = (not size or size < 0) and 0 or size
+
     local f, err = io.open(p, "rb")
     if not f or err then
         return nil, err, nil
     end
 
-    local c = f:read("*all")
+    local left = size
+    local buf = buffer:new()
+
+    while left ~= 0 do
+        local block_size = math.min(left, buffer_size)
+        local block = f:read(block_size)
+        if not block then
+            break
+        end
+        buf:add(block)
+        left = math.max(left - block_size, 0)
+    end
     f:close()
-    return true, nil, c
+
+    return true, nil, buf
 end
 
 return _M