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| 1 | +// Package prometheus provides Prometheus metrics for Mailpit |
| 2 | +package prometheus |
| 3 | + |
| 4 | +import ( |
| 5 | + "net/http" |
| 6 | + "strings" |
| 7 | + "time" |
| 8 | + |
| 9 | + "github.com/axllent/mailpit/config" |
| 10 | + "github.com/axllent/mailpit/internal/logger" |
| 11 | + "github.com/axllent/mailpit/internal/stats" |
| 12 | + "github.com/prometheus/client_golang/prometheus" |
| 13 | + "github.com/prometheus/client_golang/prometheus/promhttp" |
| 14 | +) |
| 15 | + |
| 16 | +var ( |
| 17 | + // Registry is the Prometheus registry for Mailpit metrics |
| 18 | + Registry = prometheus.NewRegistry() |
| 19 | + |
| 20 | + // Metrics |
| 21 | + totalMessages prometheus.Gauge |
| 22 | + unreadMessages prometheus.Gauge |
| 23 | + databaseSize prometheus.Gauge |
| 24 | + messagesDeleted prometheus.Counter |
| 25 | + smtpAccepted prometheus.Counter |
| 26 | + smtpRejected prometheus.Counter |
| 27 | + smtpIgnored prometheus.Counter |
| 28 | + smtpAcceptedSize prometheus.Counter |
| 29 | + uptime prometheus.Gauge |
| 30 | + memoryUsage prometheus.Gauge |
| 31 | + tagCounters *prometheus.GaugeVec |
| 32 | +) |
| 33 | + |
| 34 | +// InitMetrics initializes all Prometheus metrics |
| 35 | +func InitMetrics() { |
| 36 | + // Create metrics |
| 37 | + totalMessages = prometheus.NewGauge(prometheus.GaugeOpts{ |
| 38 | + Name: "mailpit_messages", |
| 39 | + Help: "Total number of messages in the database", |
| 40 | + }) |
| 41 | + |
| 42 | + unreadMessages = prometheus.NewGauge(prometheus.GaugeOpts{ |
| 43 | + Name: "mailpit_messages_unread", |
| 44 | + Help: "Number of unread messages in the database", |
| 45 | + }) |
| 46 | + |
| 47 | + databaseSize = prometheus.NewGauge(prometheus.GaugeOpts{ |
| 48 | + Name: "mailpit_database_size_bytes", |
| 49 | + Help: "Size of the database in bytes", |
| 50 | + }) |
| 51 | + |
| 52 | + messagesDeleted = prometheus.NewCounter(prometheus.CounterOpts{ |
| 53 | + Name: "mailpit_messages_deleted_total", |
| 54 | + Help: "Total number of messages deleted", |
| 55 | + }) |
| 56 | + |
| 57 | + smtpAccepted = prometheus.NewCounter(prometheus.CounterOpts{ |
| 58 | + Name: "mailpit_smtp_accepted_total", |
| 59 | + Help: "Total number of SMTP messages accepted", |
| 60 | + }) |
| 61 | + |
| 62 | + smtpRejected = prometheus.NewCounter(prometheus.CounterOpts{ |
| 63 | + Name: "mailpit_smtp_rejected_total", |
| 64 | + Help: "Total number of SMTP messages rejected", |
| 65 | + }) |
| 66 | + |
| 67 | + smtpIgnored = prometheus.NewCounter(prometheus.CounterOpts{ |
| 68 | + Name: "mailpit_smtp_ignored_total", |
| 69 | + Help: "Total number of SMTP messages ignored (duplicates)", |
| 70 | + }) |
| 71 | + |
| 72 | + smtpAcceptedSize = prometheus.NewCounter(prometheus.CounterOpts{ |
| 73 | + Name: "mailpit_smtp_accepted_size_bytes_total", |
| 74 | + Help: "Total size of accepted SMTP messages in bytes", |
| 75 | + }) |
| 76 | + |
| 77 | + uptime = prometheus.NewGauge(prometheus.GaugeOpts{ |
| 78 | + Name: "mailpit_uptime_seconds", |
| 79 | + Help: "Uptime of Mailpit in seconds", |
| 80 | + }) |
| 81 | + |
| 82 | + memoryUsage = prometheus.NewGauge(prometheus.GaugeOpts{ |
| 83 | + Name: "mailpit_memory_usage_bytes", |
| 84 | + Help: "Memory usage in bytes", |
| 85 | + }) |
| 86 | + |
| 87 | + tagCounters = prometheus.NewGaugeVec( |
| 88 | + prometheus.GaugeOpts{ |
| 89 | + Name: "mailpit_tag_messages", |
| 90 | + Help: "Number of messages per tag", |
| 91 | + }, |
| 92 | + []string{"tag"}, |
| 93 | + ) |
| 94 | + |
| 95 | + // Register metrics |
| 96 | + Registry.MustRegister(totalMessages) |
| 97 | + Registry.MustRegister(unreadMessages) |
| 98 | + Registry.MustRegister(databaseSize) |
| 99 | + Registry.MustRegister(messagesDeleted) |
| 100 | + Registry.MustRegister(smtpAccepted) |
| 101 | + Registry.MustRegister(smtpRejected) |
| 102 | + Registry.MustRegister(smtpIgnored) |
| 103 | + Registry.MustRegister(smtpAcceptedSize) |
| 104 | + Registry.MustRegister(uptime) |
| 105 | + Registry.MustRegister(memoryUsage) |
| 106 | + Registry.MustRegister(tagCounters) |
| 107 | +} |
| 108 | + |
| 109 | +// UpdateMetrics updates all metrics with current values |
| 110 | +func UpdateMetrics() { |
| 111 | + info := stats.Load() |
| 112 | + |
| 113 | + totalMessages.Set(float64(info.Messages)) |
| 114 | + unreadMessages.Set(float64(info.Unread)) |
| 115 | + databaseSize.Set(float64(info.DatabaseSize)) |
| 116 | + messagesDeleted.Add(float64(info.RuntimeStats.MessagesDeleted)) |
| 117 | + smtpAccepted.Add(float64(info.RuntimeStats.SMTPAccepted)) |
| 118 | + smtpRejected.Add(float64(info.RuntimeStats.SMTPRejected)) |
| 119 | + smtpIgnored.Add(float64(info.RuntimeStats.SMTPIgnored)) |
| 120 | + smtpAcceptedSize.Add(float64(info.RuntimeStats.SMTPAcceptedSize)) |
| 121 | + uptime.Set(float64(info.RuntimeStats.Uptime)) |
| 122 | + memoryUsage.Set(float64(info.RuntimeStats.Memory)) |
| 123 | + |
| 124 | + // Reset tag counters |
| 125 | + tagCounters.Reset() |
| 126 | + |
| 127 | + // Update tag counters |
| 128 | + for tag, count := range info.Tags { |
| 129 | + tagCounters.WithLabelValues(tag).Set(float64(count)) |
| 130 | + } |
| 131 | +} |
| 132 | + |
| 133 | +// Returns the Prometheus handler & disables double compression in middleware |
| 134 | +func GetHandler() http.Handler { |
| 135 | + return promhttp.HandlerFor(Registry, promhttp.HandlerOpts{ |
| 136 | + DisableCompression: true, |
| 137 | + }) |
| 138 | +} |
| 139 | + |
| 140 | +// StartUpdater starts the periodic metrics update routine |
| 141 | +func StartUpdater() { |
| 142 | + InitMetrics() |
| 143 | + UpdateMetrics() |
| 144 | + |
| 145 | + // Start periodic updates |
| 146 | + go func() { |
| 147 | + ticker := time.NewTicker(15 * time.Second) |
| 148 | + defer ticker.Stop() |
| 149 | + |
| 150 | + for range ticker.C { |
| 151 | + UpdateMetrics() |
| 152 | + } |
| 153 | + }() |
| 154 | +} |
| 155 | + |
| 156 | +// StartSeparateServer starts a separate HTTP server for Prometheus metrics |
| 157 | +func StartSeparateServer() { |
| 158 | + StartUpdater() |
| 159 | + |
| 160 | + logger.Log().Infof("[prometheus] metrics server listening on %s", config.PrometheusListen) |
| 161 | + |
| 162 | + // Create a dedicated mux for the metrics server |
| 163 | + mux := http.NewServeMux() |
| 164 | + mux.Handle("/metrics", promhttp.HandlerFor(Registry, promhttp.HandlerOpts{})) |
| 165 | + |
| 166 | + // Create a dedicated server instance |
| 167 | + server := &http.Server{ |
| 168 | + Addr: config.PrometheusListen, |
| 169 | + Handler: mux, |
| 170 | + } |
| 171 | + |
| 172 | + // Start HTTP server |
| 173 | + if err := server.ListenAndServe(); err != nil { |
| 174 | + logger.Log().Errorf("[prometheus] metrics server error: %s", err.Error()) |
| 175 | + } |
| 176 | +} |
| 177 | + |
| 178 | +// GetMode returns the Prometheus run mode |
| 179 | +func GetMode() string { |
| 180 | + mode := strings.ToLower(strings.TrimSpace(config.PrometheusListen)) |
| 181 | + if mode == "false" { |
| 182 | + return "disabled" |
| 183 | + } |
| 184 | + if mode == "true" { |
| 185 | + return "integrated" |
| 186 | + } |
| 187 | + return "separate" |
| 188 | +} |
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