Publish ITWorx Pulse source

internal/systemstatusapi/handler.go

@@ -0,0 +1,76 @@
+package systemstatusapi
+
+import (
+	"context"
+	"encoding/json"
+	"github.com/itworx/pulse/internal/problem"
+	"github.com/itworx/pulse/internal/systemstatus"
+	"net/http"
+	"runtime"
+)
+
+type Handler struct {
+	Snapshot    func(context.Context) (systemstatus.Snapshot, error)
+	Diagnostics func(context.Context) (Diagnostics, error)
+}
+
+type Diagnostics struct {
+	Status  systemstatus.Snapshot `json:"status"`
+	Config  ConfigSummary         `json:"config"`
+	Runtime RuntimeSummary        `json:"runtime"`
+	Metrics string                `json:"metrics"`
+}
+
+type ConfigSummary struct {
+	Environment          string `json:"environment"`
+	Timezone             string `json:"timezone"`
+	Locale               string `json:"locale"`
+	AuthMode             string `json:"authMode"`
+	PublicURLConfigured  bool   `json:"publicUrlConfigured"`
+	DatabaseConfigured   bool   `json:"databaseConfigured"`
+	PrometheusConfigured bool   `json:"prometheusConfigured"`
+	UnraidConfigured     bool   `json:"unraidConfigured"`
+	OIDCConfigured       bool   `json:"oidcConfigured"`
+}
+
+type RuntimeSummary struct {
+	Goroutines int    `json:"goroutines"`
+	GoVersion  string `json:"goVersion"`
+}
+
+func (h Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodGet {
+		problem.Write(w, r, http.StatusMethodNotAllowed, "METHOD_NOT_ALLOWED", "Method not allowed", "Only GET is supported.", nil)
+		return
+	}
+	var value any
+	var err error
+	switch r.URL.Path {
+	case "/api/v1/system/status":
+		if h.Snapshot == nil {
+			err = http.ErrServerClosed
+		} else {
+			value, err = h.Snapshot(r.Context())
+		}
+	case "/api/v1/system/diagnostics":
+		if h.Diagnostics == nil {
+			err = http.ErrServerClosed
+		} else {
+			value, err = h.Diagnostics(r.Context())
+		}
+	default:
+		http.NotFound(w, r)
+		return
+	}
+	if err != nil {
+		problem.Write(w, r, http.StatusServiceUnavailable, "STATUS_UNAVAILABLE", "Status unavailable", "The system status could not be read.", nil)
+		return
+	}
+	w.Header().Set("Content-Type", "application/json")
+	w.Header().Set("Cache-Control", "private, no-store")
+	_ = json.NewEncoder(w).Encode(value)
+}
+
+func Runtime() RuntimeSummary {
+	return RuntimeSummary{Goroutines: runtime.NumGoroutine(), GoVersion: runtime.Version()}
+}