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package daemon
import (
"context"
"database/sql"
"fmt"
"net/http"
"os"
"path/filepath"
"strings"
"codeberg.org/snonux/goprecords/internal/recordsdir"
"codeberg.org/snonux/goprecords/internal/storage"
)
func metricsHandler(statsDir, dbPath string) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
if r.Method != http.MethodGet {
http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
return
}
body, err := buildMetrics(r.Context(), statsDir, dbPath)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "text/plain; version=0.0.4; charset=utf-8")
w.WriteHeader(http.StatusOK)
_, _ = w.Write(body)
}
}
func buildMetrics(ctx context.Context, statsDir, dbPath string) ([]byte, error) {
entries, err := recordsdir.ListNonEmptyFiles(statsDir)
if err != nil {
return nil, fmt.Errorf("list records: %w", err)
}
excluded, err := loadExcludedSet(ctx, dbPath)
if err != nil {
return nil, fmt.Errorf("load excluded hosts: %w", err)
}
var sb strings.Builder
writeMetricHeader(&sb)
for _, e := range entries {
mtime, err := recordsMtime(statsDir, e.Host)
if err != nil {
continue
}
isExcluded := excluded[e.Host]
writeHostMetric(&sb, e.Host, mtime, isExcluded)
}
return []byte(sb.String()), nil
}
func writeMetricHeader(sb *strings.Builder) {
sb.WriteString("# HELP goprecords_host_records_last_update_timestamp_seconds Unix timestamp of the last records file update for each host.\n")
sb.WriteString("# TYPE goprecords_host_records_last_update_timestamp_seconds gauge\n")
}
func writeHostMetric(sb *strings.Builder, host string, mtime int64, excluded bool) {
excludedVal := "false"
if excluded {
excludedVal = "true"
}
fmt.Fprintf(sb, "goprecords_host_records_last_update_timestamp_seconds{host=%q,excluded=%q} %d\n",
host, excludedVal, mtime)
}
func recordsMtime(statsDir, host string) (int64, error) {
path := filepath.Join(statsDir, host+".records")
fi, err := os.Stat(path)
if err != nil {
return 0, err
}
return fi.ModTime().Unix(), nil
}
func loadExcludedSet(ctx context.Context, dbPath string) (map[string]bool, error) {
if dbPath == "" {
return map[string]bool{}, nil
}
db, err := storage.Open(ctx, dbPath)
if err != nil {
return map[string]bool{}, nil
}
defer db.Close()
return loadExcludedHosts(ctx, db)
}
func loadExcludedHosts(ctx context.Context, db *sql.DB) (map[string]bool, error) {
hosts, err := storage.LoadExcludedHosts(ctx, db)
if err != nil {
return nil, err
}
set := make(map[string]bool, len(hosts))
for _, h := range hosts {
set[h.Host] = true
}
return set, nil
}
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