sfive nginx-lua plugin works now

1 files changed, 45 insertions, 3 deletions

diff --git a/src/daq/nginx-lua/s5-nginx-fetch.lua b/src/daq/nginx-lua/s5-nginx-fetch.lua
index 90503de..8bfcf07 100644
--- a/src/daq/nginx-lua/s5-nginx-fetch.lua
+++ b/src/daq/nginx-lua/s5-nginx-fetch.lua
@@ -33,10 +33,52 @@
 -- Install this by adding the following to your nginx.conf
 --
 -- location /sfive {
+--   allow localhost;
+--   deny  all;
+--
+--   lua_check_client_abort on;
 --   content_by_lua_file '/path/to/s5-nginx-fetch.lua';
 -- }
 --
 
-ngx.say('Content-type: text/plain; charset=UTF-8')
-ngx.say('')
-ngx.say('sfive says hello world!')
+local sfive = ngx.shared.sfive
+
+local function fetch_cleanup()
+   ngx.log(ngx.INFO, "SFive(fetch): cleanup fetch")
+   sfive:delete("fetch:connected")
+end
+
+local ok, err, force = sfive:add("fetch:connected", 1)
+-- TODO: race condition: when client disconnects here we won't free up the singleton...
+if not ok then
+   if err == "exists" then
+      ngx.exit(ngx.HTTP_SERVICE_UNAVAILABLE)
+   else
+      ngx.log(ngx.ERR, "SFive(fetch): failed to set connected flag: " .. err)
+      ngx.exit(ngx.HTTP_INTERNAL_SERVER_ERROR)
+   end
+else
+   local ok, err = ngx.on_abort(fetch_cleanup)
+   if not ok then
+      ngx.log(ngx.ERR, "SFive(fetch): failed to register the on_abort callback: ", err)
+      ngx.exit(ngx.HTTP_INTERNAL_SERVER_ERROR)
+   end
+
+   ngx.log(ngx.INFO, "SFive(fetch): client connected")
+
+   local sfive_log = ngx.shared.sfive_log
+   while true do
+      logs = sfive_log:get_keys()
+      for i, k in ipairs(logs) do
+         local ok, err = ngx.say(sfive_log:get(k))
+         if not ok then
+            ngx.log(ngx.ERR, "SFive(fetch): failed to register the on_abort callback: ", err)
+            break
+         end
+         sfive_log:delete(k)
+      end
+      ngx.flush()
+      ngx.sleep(0.1)
+   end
+   fetch_cleenup()
+end