Class: PrometheusExporter::Server::WebServer
- Inherits:
-
Object
- Object
- PrometheusExporter::Server::WebServer
- Defined in:
- lib/prometheus_exporter/server/web_server.rb
Instance Attribute Summary collapse
-
#collector ⇒ Object
readonly
Returns the value of attribute collector.
Instance Method Summary collapse
- #add_gauge(name, help, value) ⇒ Object
- #handle_metrics(req, res) ⇒ Object
-
#initialize(port:, collector: nil) ⇒ WebServer
constructor
A new instance of WebServer.
- #metrics ⇒ Object
- #start ⇒ Object
- #stop ⇒ Object
Constructor Details
#initialize(port:, collector: nil) ⇒ WebServer
Returns a new instance of WebServer.
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# File 'lib/prometheus_exporter/server/web_server.rb', line 10 def initialize(port: , collector: nil) @server = WEBrick::HTTPServer.new( Port: port, AccessLog: [], Logger: WEBrick::Log.new("/dev/null") ) @collector = collector || Collector.new @port = port @server.mount_proc '/' do |req, res| res['ContentType'] = 'text/plain; charset=utf-8' if req.path == '/metrics' res.status = 200 res.body = metrics elsif req.path == '/send-metrics' handle_metrics(req, res) else res.status = 404 res.body = "Not Found! The Prometheus Discourse plugin only listens on /metrics and /send-metrics" end end end |
Instance Attribute Details
#collector ⇒ Object (readonly)
Returns the value of attribute collector.
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# File 'lib/prometheus_exporter/server/web_server.rb', line 8 def collector @collector end |
Instance Method Details
#add_gauge(name, help, value) ⇒ Object
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# File 'lib/prometheus_exporter/server/web_server.rb', line 89 def add_gauge(name, help, value) gauge = PrometheusExporter::Metric::Gauge.new(name, help) gauge.observe(value) @metrics << gauge end |
#handle_metrics(req, res) ⇒ Object
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# File 'lib/prometheus_exporter/server/web_server.rb', line 35 def handle_metrics(req, res) req.body do |block| begin @collector.process(JSON.parse(block)) rescue => e res.body = "Bad Metrics #{e}" res.status = e.respond_to?(:status_code) ? e.status_code : 500 return end end res.body = "OK" res.status = 200 end |
#metrics ⇒ Object
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# File 'lib/prometheus_exporter/server/web_server.rb', line 64 def metrics metric_text = nil begin Timeout::timeout(2) do metric_text = @collector.prometheus_metrics_text end rescue Timeout::Error # we timed out ... bummer STDERR.puts "Generating Prometheus metrics text timed out" end @metrics = [] add_gauge( "collector_working", "Is the master process collector able to collect metrics", metric_text && metric_text.length > 0 ? 1 : 0 ) <<~TEXT #{@metrics.map(&:to_prometheus_text).join("\n\n")} #{metric_text} TEXT end |
#start ⇒ Object
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# File 'lib/prometheus_exporter/server/web_server.rb', line 50 def start @runner ||= Thread.start do begin @server.start rescue => e STDERR.puts "Failed to start prometheus collector web on port #{@port}: #{e}" end end end |
#stop ⇒ Object
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# File 'lib/prometheus_exporter/server/web_server.rb', line 60 def stop @server.shutdown end |