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mod_pubsub_eventsource/mod_pubsub_eventsource.lua @ 4776:13e913471b75
mod_http_admin_api: Ensure freshness of metrics when in manual mode
When in manual collection mode, as recommended for Prometheus,
collection needs to be triggered manually, or they would be stale,
possibly dating from the start of the server. This might vary per metric
depending on how and when the metrics are gathered.
author | Kim Alvefur <zash@zash.se> |
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date | Thu, 18 Nov 2021 19:26:07 +0100 |
parent | 4508:0329cf8cdecb |
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module:depends("http"); module:depends("pubsub"); local streams = {}; local service = hosts[module.host].modules.pubsub.service; function client_closed(response) local node = response._eventsource_node; module:log("debug", "Destroying client for %q", node); streams[node][response] = nil; if next(streams[node]) == nil then streams[node] = nil; end end function serve_stream(event, node) module:log("debug", "Client subscribed to: %s", node); local response = event.response; response.on_destroy = client_closed; response._eventsource_node = node; response.conn:write(table.concat({ "HTTP/1.1 200 OK"; "Content-Type: text/event-stream"; "Access-Control-Allow-Origin: *"; "Access-Control-Allow-Methods: GET"; "Access-Control-Max-Age: 7200"; ""; ""; }, "\r\n")); local clientlist = streams[node]; if not clientlist then clientlist = {}; streams[node] = clientlist; end clientlist[response] = response.conn; return true; end function handle_update(event) module:log("debug", "Item published: %q", event.node); local node = event.node; local clientlist = streams[node]; local item = event.item; if (item.name == "json" and item.attr.xmlns == "urn:xmpp:json:0") or (item.name == "data" and item.attr.xmlns == "https://prosody.im/protocol/data") then item = item[1]; end local data = "data: "..tostring(item):gsub("\n", "\ndata: ").."\n\n"; if not clientlist then module:log("debug", "No clients for %q", node); return; end for response, conn in pairs(clientlist) do conn:write(data); end end module:provides("http", { name = "eventsource"; route = { ["GET /*"] = serve_stream; }; }); module:hook_object_event(service.events, "item-published", handle_update);