refactor(server/logger): batch log submissions

Create a temporary table and submit logs in a single batch after 500ms.
Includes some micro-optimisation and a new convar to set logging service.

imports/logger/server.lua

@@ -1,30 +1,50 @@
-local key = GetConvar('datadog:key', '')
+local service = GetConvar('ox:logger', 'datadog')
+local hostname = GetConvar('sv_projectName', 'fxserver')
+local buffer
+local bufferSize = 0
 
-if key ~= '' then
-	local site = ('https://http-intake.logs.%s/api/v2/logs'):format(GetConvar('datadog:site', 'datadoghq.com'))
-	local resourceName = GetCurrentResourceName()
-	key = key:gsub("[\'\"]", '')
+local function badResponse(endpoint, response)
+    print(('unable to submit logs to %s\n%s'):format(endpoint, json.encode(response, { indent = true })))
+end
 
-	function lib.logger(source, event, message, ...)
-		local data = json.encode({
-			hostname = resourceName,
-			service = event,
-			message = message,
-			ddsource = tostring(source),
-			ddtags = string.strjoin(',', string.tostringall(...))
-		})
+if service == 'datadog' then
+    local key = GetConvar('datadog:key', ''):gsub("[\'\"]", '')
 
-		PerformHttpRequest(site, function(status, _, _, response)
-			if status ~= 202 then
-				-- Thanks, I hate it
-				response = json.decode(response:sub(10)).errors[1]
-				print(('unable to submit logs to %s\n%s'):format(site, json.encode(response, {indent=true})))
-			end
-		end, 'POST', data, {
-			['Content-Type'] = 'application/json',
-			['DD-API-KEY'] = key
-		})
-	end
+    if key ~= '' then
+        local endpoint = ('https://http-intake.logs.%s/api/v2/logs'):format(GetConvar('datadog:site', 'datadoghq.com'))
+
+        local headers = {
+            ['Content-Type'] = 'application/json',
+            ['DD-API-KEY'] = key,
+        }
+
+        function lib.logger(source, event, message, ...)
+            if not buffer then
+                buffer = {}
+
+                SetTimeout(500, function()
+                    PerformHttpRequest(endpoint, function(status, _, _, response)
+                        if status ~= 202 then
+                            badResponse(endpoint, json.decode(response:sub(10)).errors[1])
+                        end
+                    end, 'POST', json.encode(buffer), headers)
+
+                    buffer = nil
+                    bufferSize = 0
+                end)
+            end
+
+            bufferSize += 1
+            buffer[bufferSize] = {
+                hostname = hostname,
+                service = event,
+                message = message,
+                resource = cache.resource,
+                ddsource = tostring(source),
+                ddtags = string.strjoin(',', string.tostringall(...))
+            }
+        end
+    end
 end
 
 return lib.logger or function() end