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package internal
import (
"encoding/json"
"os"
"path/filepath"
"time"
)
// notifyState tracks the last notification timestamp and the check states at that time.
// This enables notification batching: Gogios can suppress emails until the configured
// interval has elapsed AND there's been an actual state change since the last notification.
type notifyState struct {
stateFile string `json:"-"`
LastNotifyEpoch int64 `json:"LastNotifyEpoch"`
CheckStates map[string]int `json:"CheckStates"` // check name -> status code at last notification
}
// newNotifyState loads the notification state from disk, or returns an empty state
// if no previous state exists (first run scenario).
func newNotifyState(stateDir string) (notifyState, error) {
ns := notifyState{
stateFile: filepath.Join(stateDir, "notify_state.json"),
CheckStates: make(map[string]int),
}
data, err := os.ReadFile(ns.stateFile)
if err != nil {
if os.IsNotExist(err) {
// First run - no previous notification state
return ns, nil
}
return ns, err
}
if err := json.Unmarshal(data, &ns); err != nil {
return ns, err
}
return ns, nil
}
// intervalElapsed returns true if the minimum notification interval has passed
// since the last notification was sent.
func (ns notifyState) intervalElapsed(minIntervalS int) bool {
if ns.LastNotifyEpoch == 0 {
// No previous notification - interval is considered elapsed
return true
}
elapsed := time.Now().Unix() - ns.LastNotifyEpoch
return elapsed >= int64(minIntervalS)
}
// hasChanges compares the current check states to the snapshot taken at the last
// notification. Returns true if any check has changed status, if new checks were
// added, or if checks were removed.
func (ns notifyState) hasChanges(currentState state) bool {
// Check for status changes or new checks
for name, cs := range currentState.checks {
prevStatus, exists := ns.CheckStates[name]
if !exists {
// New check appeared since last notification
return true
}
if int(cs.Status) != prevStatus {
// Status changed since last notification
return true
}
}
// Check for removed checks
for name := range ns.CheckStates {
if _, exists := currentState.checks[name]; !exists {
return true
}
}
return false
}
// recordNotification saves the current timestamp and a snapshot of all check states.
// Call this after successfully sending a notification email.
func (ns *notifyState) recordNotification(currentState state) error {
ns.LastNotifyEpoch = time.Now().Unix()
ns.CheckStates = make(map[string]int)
for name, cs := range currentState.checks {
ns.CheckStates[name] = int(cs.Status)
}
return ns.persist()
}
// persist writes the notification state to disk atomically using a temp file.
func (ns notifyState) persist() error {
stateDir := filepath.Dir(ns.stateFile)
if _, err := os.Stat(stateDir); os.IsNotExist(err) {
if err := os.MkdirAll(stateDir, 0o755); err != nil {
return err
}
}
data, err := json.Marshal(ns)
if err != nil {
return err
}
tmpFile := ns.stateFile + ".tmp"
if err := os.WriteFile(tmpFile, data, 0o644); err != nil {
return err
}
return os.Rename(tmpFile, ns.stateFile)
}
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