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package transporthealth
import (
"context"
"log"
"sync"
"time"
)
type Checker interface {
Check(context.Context) error
}
type Monitor struct {
checker Checker
interval time.Duration
timeout time.Duration
mu sync.RWMutex
ready bool
checkedAt time.Time
}
func New(checker Checker, interval, timeout time.Duration) *Monitor {
if interval < time.Minute {
interval = 15 * time.Minute
}
if timeout <= 0 {
timeout = 90 * time.Second
}
return &Monitor{checker: checker, interval: interval, timeout: timeout}
}
func (m *Monitor) Run(ctx context.Context) {
m.Probe(ctx)
ticker := time.NewTicker(m.interval)
defer ticker.Stop()
for {
select {
case <-ctx.Done():
return
case <-ticker.C:
m.Probe(ctx)
}
}
}
func (m *Monitor) Probe(ctx context.Context) {
probeCtx, cancel := context.WithTimeout(ctx, m.timeout)
defer cancel()
if err := m.checker.Check(probeCtx); err != nil {
m.MarkFailure(err)
log.Printf("transport probe failed: %v", err)
return
}
m.MarkSuccess()
log.Printf("transport probe succeeded")
}
func (m *Monitor) Ready() bool {
m.mu.RLock()
ready := m.ready
checkedAt := m.checkedAt
m.mu.RUnlock()
if !ready || checkedAt.IsZero() {
return false
}
return time.Since(checkedAt) <= 2*m.interval+m.timeout
}
func (m *Monitor) MarkSuccess() {
m.mu.Lock()
m.ready = true
m.checkedAt = time.Now()
m.mu.Unlock()
}
func (m *Monitor) MarkFailure(error) {
m.mu.Lock()
m.ready = false
m.checkedAt = time.Now()
m.mu.Unlock()
}
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