0x1d
30320304f6
Implemented Epic 1 core kernel and infrastructure stories: Story 1.1: Enhanced DI Container - Added providers for database, health, metrics, and error bus - Extended CoreModule to include all core services Story 1.2: Database Layer with Ent ORM - Created Ent schema for User, Role, Permission, AuditLog entities - Implemented many-to-many relationships (User-Role, Role-Permission) - Created database client wrapper with connection pooling - Added database provider to DI container with migration support Story 1.3: Health Monitoring and Metrics System - Implemented health check registry and interface - Added database health checker - Created Prometheus metrics system with HTTP instrumentation - Added health and metrics providers to DI container Story 1.4: Error Handling and Error Bus - Implemented channel-based error bus - Created ErrorPublisher interface - Added error bus provider with lifecycle management Story 1.5: HTTP Server Foundation - Created HTTP server with Gin framework - Implemented comprehensive middleware stack: - Request ID generation - Structured logging - Panic recovery with error bus integration - Prometheus metrics collection - CORS support - Registered core routes: /healthz, /ready, /metrics - Integrated with FX lifecycle for graceful shutdown All components are integrated via DI container and ready for use.
98 lines
2.4 KiB
Go
98 lines
2.4 KiB
Go
package metrics
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import (
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"net/http"
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"time"
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"github.com/gin-gonic/gin"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/client_golang/prometheus/promhttp"
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)
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// Metrics holds all Prometheus metrics.
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type Metrics struct {
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httpRequestDuration *prometheus.HistogramVec
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httpRequestTotal *prometheus.CounterVec
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httpErrorsTotal *prometheus.CounterVec
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registry *prometheus.Registry
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}
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// NewMetrics creates a new metrics registry with all metrics.
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func NewMetrics() *Metrics {
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registry := prometheus.NewRegistry()
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m := &Metrics{
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registry: registry,
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httpRequestDuration: prometheus.NewHistogramVec(
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prometheus.HistogramOpts{
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Name: "http_request_duration_seconds",
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Help: "HTTP request duration in seconds",
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Buckets: prometheus.DefBuckets,
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},
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[]string{"method", "path", "status"},
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),
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httpRequestTotal: prometheus.NewCounterVec(
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prometheus.CounterOpts{
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Name: "http_requests_total",
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Help: "Total number of HTTP requests",
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},
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[]string{"method", "path", "status"},
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),
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httpErrorsTotal: prometheus.NewCounterVec(
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prometheus.CounterOpts{
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Name: "http_errors_total",
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Help: "Total number of HTTP errors",
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},
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[]string{"method", "path", "status"},
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),
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}
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// Register all metrics
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registry.MustRegister(m.httpRequestDuration)
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registry.MustRegister(m.httpRequestTotal)
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registry.MustRegister(m.httpErrorsTotal)
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return m
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}
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// HTTPMiddleware returns a Gin middleware for collecting HTTP metrics.
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func (m *Metrics) HTTPMiddleware() gin.HandlerFunc {
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return func(c *gin.Context) {
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start := time.Now()
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// Process request
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c.Next()
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// Calculate duration
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duration := time.Since(start).Seconds()
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// Get request details
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method := c.Request.Method
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path := c.FullPath()
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if path == "" {
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path = c.Request.URL.Path
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}
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status := c.Writer.Status()
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// Record metrics
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m.httpRequestDuration.WithLabelValues(method, path, http.StatusText(status)).Observe(duration)
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m.httpRequestTotal.WithLabelValues(method, path, http.StatusText(status)).Inc()
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// Record errors (4xx and 5xx)
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if status >= 400 {
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m.httpErrorsTotal.WithLabelValues(method, path, http.StatusText(status)).Inc()
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}
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}
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}
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// Handler returns an HTTP handler for the /metrics endpoint.
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func (m *Metrics) Handler() http.Handler {
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return promhttp.HandlerFor(m.registry, promhttp.HandlerOpts{})
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}
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// Registry returns the Prometheus registry.
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func (m *Metrics) Registry() *prometheus.Registry {
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return m.registry
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}
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