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package main
import (
"context"
"fmt"
"log/slog"
"net/http"
"runtime"
"time"
"golang.org/x/sync/errgroup"
"within.website/x/web/useragent"
)
func checkURL(ctx context.Context, probe Probe) *ProbeResult {
result := &ProbeResult{
ProbeID: probe.ID,
Region: *region,
}
userAgent := useragent.GenUserAgent("hdrwtch/1.0", fmt.Sprintf("https://%s/docs/why-in-logs", *domain))
start := time.Now()
req, err := http.NewRequestWithContext(ctx, "GET", probe.URL, nil)
if err != nil {
result.Success = false
result.Remark = fmt.Sprintf("failed to create request: %v", err)
return result
}
req.Header.Set("User-Agent", userAgent)
resp, err := http.DefaultClient.Do(req)
if err != nil {
result.Success = false
result.Remark = fmt.Sprintf("failed to execute request: %v", err)
return result
}
defer resp.Body.Close()
result.Success = true
result.StatusCode = resp.StatusCode
result.Duration = time.Since(start)
result.LastModified = resp.Header.Get("Last-Modified")
return result
}
func (s *Server) cron() {
ctx, cancel := context.WithTimeout(context.Background(), 14*time.Minute) // 1 minute less than the cron interval
defer cancel()
tx := s.dao.db.Begin().WithContext(ctx)
defer tx.Rollback()
var probes []Probe
if err := s.dao.db.Preload("LastResult").Find(&probes).Error; err != nil {
slog.Error("failed to get probes", "err", err)
return
}
g, gCtx := errgroup.WithContext(ctx)
g.SetLimit(runtime.NumCPU())
for _, probe := range probes {
probe := probe
g.Go(func() error {
result := checkURL(gCtx, probe)
if result.LastModified != probe.LastResult.LastModified {
slog.Info("probe result changed", "probe", probe.ID, "old", probe.LastResult, "new", result)
user, err := s.dao.GetUser(gCtx, probe.UserID)
if err != nil {
slog.Error("failed to get user", "err", err)
return err
}
if err := s.messageUser(user, fmt.Sprintf("*%s*:\n\nLast modified: %s\nRegion: %s\nStatus code: %d\nRemark: %s", probe.Name, result.LastModified, result.Region, result.StatusCode, result.Remark)); err != nil {
slog.Error("failed to message user", "err", err)
return err
}
}
if err := s.dao.CreateProbeResult(gCtx, tx, probe, result); err != nil {
slog.Error("failed to create probe result", "err", err, "probe", probe, "result", result)
return err
}
return nil
})
}
if err := g.Wait(); err != nil {
slog.Error("failed to check probes", "err", err)
}
if err := tx.Commit().Error; err != nil {
slog.Error("failed to commit transaction", "err", err)
}
slog.Info("checked probes", "count", len(probes))
}
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