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|
package app
import (
"context"
"fmt"
"os"
"strings"
"sync"
"time"
"codeberg.org/snonux/loadbars/internal/collector"
"codeberg.org/snonux/loadbars/internal/config"
"codeberg.org/snonux/loadbars/internal/display"
)
// Run starts the loadbars application: collectors and display.
// It blocks until the user quits (e.g. 'q' key).
func Run(cfg *config.Config) error {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
store := NewStore()
var wg sync.WaitGroup
for _, host := range cfg.Hosts {
h := host
wg.Add(1)
go func() {
defer wg.Done()
runCollectorLoop(ctx, h, cfg, store)
}()
}
err := display.Run(ctx, cfg, store)
cancel()
wg.Wait()
return err
}
func runCollectorLoop(ctx context.Context, host string, cfg *config.Config, store *Store) {
backoff := time.Second
for {
err := collector.Run(ctx, host, cfg, store)
if err == nil || ctx.Err() != nil {
return
}
fmt.Fprintf(os.Stderr, "!!! collector %s failed: %v\n", host, err)
if !isRemoteHost(host) {
return
}
timer := time.NewTimer(backoff)
select {
case <-ctx.Done():
timer.Stop()
return
case <-timer.C:
}
if backoff < 30*time.Second {
backoff *= 2
if backoff > 30*time.Second {
backoff = 30 * time.Second
}
}
}
}
func isRemoteHost(host string) bool {
host = strings.TrimSpace(host)
if i := strings.Index(host, ":"); i >= 0 {
host = strings.TrimSpace(host[:i])
}
return host != "localhost" && host != "127.0.0.1"
}
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