support dgram unix socket

README.md

@@ -117,7 +117,7 @@ Available user configurations are listed as follows:
 
 * `path`
 
-    If the log server uses a stream-typed unix domain socket, `path` is the socket file path. Note that host/port and path cannot both be empty. At least one must be supplied.
+    the unix socket file path. Note that host/port and path cannot both be empty. At least one must be supplied.
 
 * `max_retry_times`
 

lib/resty/logger/socket.lua

@@ -114,7 +114,11 @@ local function _do_connect()
             ok, err = sock:connect(host, port)
         end
     elseif path then
-        ok, err = sock:connect("unix:" .. path)
+        if (sock_type == 'udp') then
+            ok, err = sock:setpeername("unix:" .. path)
+        else
+            ok, err = sock:connect("unix:" .. path)
+        end
     end
 
     if not ok then

t/sanity.t

@@ -63,7 +63,7 @@ foo
 
 
 
-=== TEST 2: small flush_limit, instant flush, unix domain socket
+=== TEST 2A: small flush_limit, instant flush, unix domain STREAM socket
 --- http_config eval: $::HttpConfig
 --- config
     location /t {
@@ -103,6 +103,46 @@ foo
 
 
 
+=== TEST 2B: small flush_limit, instant flush, unix domain DGRAM socket
+--- http_config eval: $::HttpConfig
+--- config
+    location /t {
+        content_by_lua 'ngx.say("foo")';
+        log_by_lua '
+            collectgarbage()  -- to help leak testing
+
+            local logger = require "resty.logger.socket"
+            if not logger.initted() then
+                local ok, err = logger.init{
+                    flush_limit = 1,
+                    path = "$TEST_NGINX_HTML_DIR/logger_test.sock",
+                    sock_type = "udp",
+                }
+                if not ok then
+                    ngx.log(ngx.ERR, err)
+                    return
+                end
+            end
+
+            local bytes, err = logger.log(ngx.var.request_uri)
+            if err then
+                ngx.log(ngx.ERR, err)
+            end
+        ';
+    }
+--- request
+GET /t?a=1&b=2
+--- wait: 0.1
+--- udp_listen eval: "$ENV{TEST_NGINX_HTML_DIR}/logger_test.sock"
+--- udp_reply:
+--- no_error_log
+[error]
+--- udp_query: /t?a=1&b=2
+--- response_body
+foo
+
+
+
 === TEST 3: small flush_limit, instant flush, write a number to remote
 --- http_config eval: $::HttpConfig
 --- config