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package operations
import (
"context"
"encoding/json"
"net/http"
"time"
"aigw/internal/billing"
"aigw/internal/controlplane"
"aigw/internal/telemetry"
)
type Handler struct {
Store readinessStore
Manager *controlplane.Manager
Billing readinessBilling
Metrics *telemetry.Metrics
MaxSnapshotAge time.Duration
ReadinessTimeout time.Duration
}
type readinessStore interface {
Ping(context.Context) error
MailQueueStatus(context.Context) (controlplane.MailQueueStatus, error)
}
type readinessBilling interface {
Ping(context.Context) error
SettlementQueueStatus(context.Context) (billing.SettlementQueueStatus, error)
OperationalStatus(context.Context) (billing.OperationalStatus, error)
}
type readinessResult struct {
name string
value map[string]any
ready bool
}
func (h Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
if r.URL.Path == "/healthz" {
write(w, http.StatusOK, map[string]any{"status": "alive"})
return
}
if r.URL.Path == "/metrics" && h.Metrics != nil {
h.Metrics.ServeHTTP(w, r)
return
}
if r.URL.Path != "/readyz" {
http.NotFound(w, r)
return
}
timeout := h.ReadinessTimeout
if timeout <= 0 {
timeout = 1500 * time.Millisecond
}
// Readiness probes are independently bounded below. Some container health
// clients close their request side aggressively after sending the GET; do
// not let that client lifecycle make every backend look unavailable.
ctx, cancel := context.WithTimeout(context.Background(), timeout)
defer cancel()
checks := map[string]any{}
ready := true
results := make(chan readinessResult, 5)
expected := map[string]struct{}{}
launch := func(name string, check func(context.Context) readinessResult) {
expected[name] = struct{}{}
go func() {
result := check(ctx)
result.name = name
results <- result
}()
}
if h.Store != nil {
launch("postgres", func(ctx context.Context) readinessResult {
if err := h.Store.Ping(ctx); err != nil {
return failedResult(err)
}
return okResult()
})
launch("mail_queue", func(ctx context.Context) readinessResult {
mail, err := h.Store.MailQueueStatus(ctx)
if err != nil {
return failedResult(err)
}
mailOK := mail.Failed == 0
if mail.OldestPending != nil && time.Since(*mail.OldestPending) > 10*time.Minute {
mailOK = false
}
return readinessResult{ready: mailOK, value: map[string]any{"status": status(mailOK), "details": mail}}
})
}
if h.Manager != nil {
healthyAt := h.Manager.LastHealthyAt()
if healthyAt.IsZero() {
healthyAt = h.Manager.LastReloadAt()
}
age := time.Since(healthyAt)
snapshotOK := h.Manager.Loaded() && age <= h.MaxSnapshotAge
checks["snapshot"] = map[string]any{"status": status(snapshotOK), "generation": h.Manager.Generation(), "age_seconds": int64(age.Seconds())}
if !snapshotOK {
ready = false
}
redisStatus := "disabled"
if h.Manager.RedisConfigured() {
redisStatus = "degraded"
if h.Manager.RedisConnected() {
redisStatus = "ok"
}
}
checks["redis"] = map[string]any{"status": redisStatus, "required": false}
}
if h.Billing != nil {
launch("billing_postgres", func(ctx context.Context) readinessResult {
if err := h.Billing.Ping(ctx); err != nil {
return failedResult(err)
}
return okResult()
})
launch("settlement_queue", func(ctx context.Context) readinessResult {
queue, err := h.Billing.SettlementQueueStatus(ctx)
if err != nil {
return failedResult(err)
}
backlog := queue.AwaitingEvent + queue.Pending + queue.Processing + queue.Retrying
queueOK := queue.SpoolRecords == 0
if queue.OldestPending != nil && time.Since(*queue.OldestPending) > 15*time.Minute {
queueOK = false
}
if h.Metrics != nil {
h.Metrics.SetSettlementQueue(backlog, queue.SpoolRecords)
}
return readinessResult{ready: queueOK, value: map[string]any{"status": status(queueOK), "backlog": backlog, "spool_records": queue.SpoolRecords, "oldest_pending": queue.OldestPending}}
})
launch("billing_operations", func(ctx context.Context) readinessResult {
billingHealth, err := h.Billing.OperationalStatus(ctx)
if err != nil {
return failedResult(err)
}
billingOK := billingHealth.Ready(time.Now().UTC())
if h.Metrics != nil {
h.Metrics.SetStripeOperations(billingHealth)
}
return readinessResult{ready: billingOK, value: map[string]any{"status": status(billingOK), "details": billingHealth}}
})
}
for len(expected) > 0 {
select {
case result := <-results:
if _, ok := expected[result.name]; !ok {
continue
}
delete(expected, result.name)
checks[result.name] = result.value
if !result.ready {
ready = false
}
case <-ctx.Done():
for name := range expected {
checks[name] = map[string]any{"status": "failed", "error": "check timed out"}
}
ready = false
expected = map[string]struct{}{}
}
}
if h.Metrics != nil {
h.Metrics.SetReady(ready)
}
code := http.StatusOK
if !ready {
code = http.StatusServiceUnavailable
}
write(w, code, map[string]any{"status": status(ready), "checks": checks})
}
func okResult() readinessResult {
return readinessResult{ready: true, value: map[string]any{"status": "ok"}}
}
func failedResult(err error) readinessResult {
message := err.Error()
if err == context.Canceled || err == context.DeadlineExceeded {
message = "check timed out"
}
return readinessResult{value: map[string]any{"status": "failed", "error": message}}
}
func status(ok bool) string {
if ok {
return "ok"
}
return "failed"
}
func write(w http.ResponseWriter, code int, value any) {
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(code)
_ = json.NewEncoder(w).Encode(value)
}
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