Wire in retention

- Update README
- Add retention metrics
- Start retention scanner if configured

README.md

@@ -33,6 +33,7 @@ It can:
  * Display the source of a message (headers + body text)
  * Display the HTML version of a message (in a new window)
  * Delete a message
+ * Purge messages after a configurable amount of time
 
 It does not yet:
 

config/config.go

@@ -109,14 +109,19 @@ func LoadConfig(filename string) error {
 		return fmt.Errorf("Failed to validate configuration")
 	}
 
-	err = parseSmtpConfig()
-	if err != nil {
-		return nil
+	if err = parseSmtpConfig(); err != nil {
+		return err
 	}
 
-	err = parseWebConfig()
+	if err = parseWebConfig(); err != nil {
+		return err
+	}
 
-	return err
+	if err = parseDataStoreConfig(); err != nil {
+		return err
+	}
+
+	return nil
 }
 
 // parseLoggingConfig trying to catch config errors early

etc/devel.conf

@@ -66,7 +66,7 @@ path=/tmp/inbucket
 # How many minutes after receipt should a message be stored until it's
 # automatically purged.  To retain messages until manually deleted, set this
 # to 0
-retention.minutes=1
+retention.minutes=0
 
 # How many milliseconds to sleep after purging messages from a mailbox.
 # This should help reduce disk I/O when there are a large number of messages

smtpd/datastore.go

@@ -30,3 +30,4 @@ type Message interface {
 	Delete() error
 	String() string
 }
+

smtpd/listener.go

@@ -65,6 +65,10 @@ func (s *Server) Start() {
 		panic(err)
 	}
 
+	// Start retention scanner
+	StartRetentionScanner(s.dataStore)
+
+	// Handle incoming connections
 	for sid := 1; ; sid++ {
 		if conn, err := ln.Accept(); err != nil {
 			// TODO Implement a max error counter before shutdown?
@@ -86,6 +90,7 @@ func metricsTicker(t *time.Ticker) {
 		expConnectsHist.Set(pushMetric(connectsHist, expConnectsTotal))
 		expErrorsHist.Set(pushMetric(errorsHist, expErrorsTotal))
 		expWarnsHist.Set(pushMetric(warnsHist, expWarnsTotal))
+		expRetentionDeletesHist.Set(pushMetric(retentionDeletesHist, expRetentionDeletesTotal))
 	}
 }
 

smtpd/retention.go

@@ -1,12 +1,58 @@
 package smtpd
 
 import (
+	"container/list"
+	"expvar"
+	"github.com/jhillyerd/inbucket/config"
 	"github.com/jhillyerd/inbucket/log"
+	"sync"
 	"time"
 )
 
-// retentionScan does a single pass of all mailboxes looking for messages that can be purged
-func retentionScan(ds DataStore, maxAge time.Duration, sleep time.Duration) error {
+var retentionScanCompleted time.Time
+var retentionScanCompletedMu sync.RWMutex
+
+var expRetentionDeletesTotal = new(expvar.Int)
+
+// History of certain stats
+var retentionDeletesHist = list.New()
+
+// History rendered as comma delim string
+var expRetentionDeletesHist = new(expvar.String)
+
+func StartRetentionScanner(ds DataStore) {
+	cfg := config.GetDataStoreConfig()
+	if cfg.RetentionMinutes > 0 {
+		// Retention scanning enabled
+		log.Info("Retention configured for %v minutes", cfg.RetentionMinutes)
+		go retentionScanner(ds, time.Duration(cfg.RetentionMinutes) * time.Minute,
+			time.Duration(cfg.RetentionSleep) * time.Millisecond)
+	} else {
+		log.Info("Retention scanner disabled")
+	}
+}
+
+func retentionScanner(ds DataStore, maxAge time.Duration, sleep time.Duration) {
+	start := time.Now()
+	for {
+		// Prevent scanner from running more than once a minute
+		since := time.Since(start)
+		if since < time.Minute {
+			dur := time.Minute - since
+			log.Trace("Retention scanner sleeping for %v", dur)
+			time.Sleep(dur)
+		}
+		start = time.Now()
+
+		// Kickoff scan
+		if err := doRetentionScan(ds, maxAge, sleep); err != nil {
+			log.Error("Error during retention scan: %v", err)
+		}
+	}
+}
+
+// doRetentionScan does a single pass of all mailboxes looking for messages that can be purged
+func doRetentionScan(ds DataStore, maxAge time.Duration, sleep time.Duration) error {
 	log.Trace("Starting retention scan")
 	cutoff := time.Now().Add(-1 * maxAge)
 	mboxes, err := ds.AllMailboxes()
@@ -26,6 +72,8 @@ func retentionScan(ds DataStore, maxAge time.Duration, sleep time.Duration) erro
 				if err != nil {
 					// Log but don't abort
 					log.Error("Failed to purge message %v: %v", msg.Id(), err)
+				} else {
+					expRetentionDeletesTotal.Add(1)
 				}
 			}
 		}
@@ -33,5 +81,32 @@ func retentionScan(ds DataStore, maxAge time.Duration, sleep time.Duration) erro
 		time.Sleep(sleep)
 	}
 
+	setRetentionScanCompleted(time.Now())
+
 	return nil
 }
+
+func setRetentionScanCompleted(t time.Time) {
+	retentionScanCompletedMu.Lock()
+	defer retentionScanCompletedMu.Unlock()
+
+	retentionScanCompleted = t
+}
+
+func getRetentionScanCompleted() time.Time {
+	retentionScanCompletedMu.RLock()
+	defer retentionScanCompletedMu.RUnlock()
+
+	return retentionScanCompleted
+}
+
+func secondsSinceRetentionScanCompleted() interface{} {
+	return time.Since(getRetentionScanCompleted()) / time.Second
+}
+
+func init() {
+	rm := expvar.NewMap("retention")
+	rm.Set("SecondsSinceScanCompleted", expvar.Func(secondsSinceRetentionScanCompleted))
+	rm.Set("DeletesHist", expRetentionDeletesHist)
+	rm.Set("DeletesTotal", expRetentionDeletesTotal)
+}

smtpd/retention_test.go

@@ -8,7 +8,7 @@ import (
 	"time"
 )
 
-func TestRetentionScanner(t *testing.T) {
+func TestDoRetentionScan(t *testing.T) {
 	// Create mock objects
 	mds := &MockDataStore{}
 
@@ -33,7 +33,7 @@ func TestRetentionScanner(t *testing.T) {
 	mb3.On("GetMessages").Return([]Message{new3}, nil)
 
 	// Test 4 hour retention
-	retentionScan(mds, 4*time.Hour, 0)
+	doRetentionScan(mds, 4*time.Hour, 0)
 
 	// Check our assertions
 	mds.AssertExpectations(t)

themes/integral/templates/root/status.html

@@ -85,6 +85,7 @@
   function displayMetrics(data, textStatus, jqXHR) {
     // Non graphing
     metric('uptime', data.uptime, timeFilter, false)
+    metric('retentionScanCompleted', data.retention.SecondsSinceScanCompleted, timeFilter, false)
 
     // JavaScript history
     metric('memstatsSys', data.memstats.Sys, sizeFilter, true)
@@ -102,6 +103,8 @@
     setHistory('smtpWarnsTotal', data.smtp.WarnsHist)
     metric('smtpErrorsTotal', data.smtp.ErrorsTotal, numberFilter, false)
     setHistory('smtpErrorsTotal', data.smtp.ErrorsHist)
+    metric('retentionDeletesTotal', data.retention.DeletesTotal, numberFilter, false)
+    setHistory('retentionDeletesTotal', data.retention.DeletesHist)
   }
 
   function loadMetrics() {
@@ -202,5 +205,21 @@ values over time.</p>
   </table>
   <p class="last">&nbsp;</p>
 </div>
+<div class="box">
+  <h3>Data Store Metrics</h3>
+  <table class="metrics">
+    <tr>
+      <th>Retention Scan:</th>
+      <td colspan="3">Completed <span id="m-retentionScanCompleted">.</span> ago</td>
+    </tr>
+    <tr>
+      <th>Retention Deletes:</th>
+      <td><span id="m-retentionDeletesTotal">.</span></td>
+      <td class="sparkline"><span id="s-retentionDeletesTotal"></span></td>
+      <td>(60s)</td>
+    </tr>
+  </table>
+  <p class="last">&nbsp;</p>
+</div>
 {{end}}