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POnginx lua redis cookie not setting
 

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  1. POnginx lua redis cookie not setting
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    <p>I am trying to set a cookie with lua+nginx+redis. This is my idea: set cookie if cookie doesn't exist and then save to redis. </p> <pre><code>local redis = require "resty.redis" local red = redis:new() local md5 = require "md5" local ip = ngx.var.remote_addr local secs = ngx.time() local uid_key = ip .. secs local uid = md5.sumhexa(uid_key) local cookie = ngx.var.cookie_uid local red_cookie = red:hget("cookie:"..uid, uid) local ok, err = red:connect("127.0.0.1", 6379) if not ok then ngx.say("failed to connect to Redis: ", err) return end local args = ngx.req.get_headers() local date_time = ngx.http_time(secs) if cookie == nil or cookie ~= red_cookie then ngx.header['Set-Cookie'] = "path=/; uid=" .. uid local res, err = red:hmset("cookie:".. uid, "uid", uid, "date_time", date_time, "user-agent", args["user-agent"] ) if not res then ngx.say("failed to set cookie: ", err) end end </code></pre> <p>and my nginx conf</p> <p>...</p> <pre><code>location /cookie { default_type "text/plain"; lua_code_cache off; content_by_lua_file /lua/test.lua; } </code></pre> <p>I am not seeing the cookie set however. I get [error] 63519#0: *408 attempt to set ngx.header.HEADER after sending out response headers, client: 127.0.0.1, server: localhost, request: "GET /cookie HTTP/1.1", host: "localhost"</p> <p>I can't seem to figure out why this wouldn't work? I also thought I could set cookies with purely nginx. I need to track users who visit my page. Any thoughts? </p> <p>Thanks!!</p> <p><strong>Update</strong></p> <p>I revised my idea to make redis requests from an upstream access point. Now I keep getting an invalid reply from redis.parser. </p> <pre><code>local redis = require "resty.redis" local md5 = require "md5" local parser = require "redis.parser" local ip = ngx.var.remote_addr local secs = ngx.time() local uid_key = ip .. secs local uid = md5.sumhexa(uid_key) local args = ngx.req.get_headers() local date_time = ngx.http_time(secs) local test_cookie = ngx.location.capture("/redis_check_cookie", {args = {cookie_uid="cookie:"..uid}}); if test_cookie.status ~= 200 or not test_cookie.body then ngx.log(ngx.ERR, "failed to query redis") ngx.exit(500) end local reqs = { {"hmset", "cookie:"..uid, "path=/"} } local raw_reqs = {} for i, req in ipairs(reqs) do table.insert(raw_reqs, parser.build_query(req)) end local res = ngx.location.capture("/redis_set_cookie?" .. #reqs, { body = table.concat(raw_reqs, "") }) local replies = parser.parse_replies(res.body, #reqs) for i, reply in ipairs(replies) do ngx.say(reply[1]) end </code></pre> <p>and my nginx conf now has:</p> <pre><code>upstream my_redis { server 127.0.0.1:6379; keepalive 1024 single; } </code></pre> <p>and </p> <pre><code> location /redis_check_cookie { internal; set_unescape_uri $cookie_uid $arg_cookie_uid; redis2_query hexists $cookie_uid uid; redis2_pass my_redis; } location /redis_set_cookie { internal; redis2_raw_queries $args $echo_request_body; redis2_pass my_redis; } </code></pre>
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