add echo lua script

config/samples/echo/echo.lua

@@ -0,0 +1,42 @@
+local socket = require("socket")
+math.randomseed(socket.gettime()*1000)
+math.random();
+
+local function generate_random_string(length)
+    local charset = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
+    local random_str = ""
+    for i = 1, length do
+        local index = math.random(1, #charset)
+        random_str = random_str .. charset:sub(index, index)
+    end
+    return random_str
+end
+
+local function req1()
+    local method = "GET"
+    local str = generate_random_string(10)  -- Generate a random string of length 10
+    local path = "http://10.96.88.88:80/?key=" .. str
+
+    local headers = {}
+    return wrk.format(method, path, headers, nil)
+end
+
+local function req2()
+    local method = "GET"
+    local path = "http://10.96.88.88:80/?key=test1"
+    local headers = {}
+    return wrk.format(method, path, headers, nil)
+end
+
+request = function()
+    -- ./wrk/wrk -d 30s -c 1 -t 1 http://10.96.88.88 -L -s ./config/samples /echo/echo.lua
+    local req1_ratio  = 1
+    local req2_ratio  = 1 - req1_ratio
+
+    local coin = math.random()
+    if coin < req1_ratio then
+        return req1()
+    else
+        return req2()
+    end
+end