feat: return ssl_session upon successful SSL connection

Author: GuyLewin

lib/resty/http.lua

@@ -165,7 +165,7 @@ end
 do
     local aio_connect = require "resty.http_connect"
     -- Function signatures to support:
-    -- ok, err = httpc:connect(options_table)
+    -- ok, err, ssl_session = httpc:connect(options_table)
     -- ok, err = httpc:connect(host, port, options_table?)
     -- ok, err = httpc:connect("unix:/path/to/unix.sock", options_table?)
     function _M.connect(self, options, ...)

lib/resty/http_connect.lua

@@ -215,9 +215,9 @@ local function connect(self, options)
         end
     end
 
+    local ssl_session
     -- Now do the ssl handshake
     if ssl and sock:getreusedtimes() == 0 then
-        local ssl_session
         ssl_session, err = sock:sslhandshake(ssl_reused_session, ssl_server_name, ssl_verify, ssl_send_status_req)
         if not ssl_session then
             self:close()
@@ -233,7 +233,7 @@ local function connect(self, options)
     self.http_proxy_auth = request_scheme ~= "https" and proxy_authorization or nil
     self.path_prefix = path_prefix
 
-    return true
+    return true, nil, ssl_session
 end
 
 return connect