Resubmit a stored event as a new undelivered event (closes #250)

internal/handlers/event_log_view.go

@@ -20,6 +20,7 @@ const maxRenderedBodyBytes = 8192
 // rather than in Go is the point of the projection — an
 // oversized body never becomes a Go string at all.
 const eventLogColumns = "id, created_at, method, content_type, " +
+	"resubmitted_from_id, " +
 	"substr(cast(body as blob), 1, ?) AS body, " +
 	"length(cast(body as blob)) AS body_bytes"
 
@@ -45,9 +46,25 @@ type EventLogView struct {
 	// than the cap, so the page owes the reader a marker.
 	BodyTruncated bool
 
+	// ResubmittedFromID names the event this one was copied
+	// from, empty for an event that arrived on the receiver.
+	ResubmittedFromID string
+
+	// ResubmitCount is how many events have been resubmitted
+	// from this one. Both directions are shown, because after
+	// a few resubmits of one captured event the log is
+	// otherwise a row of identical bodies with nothing saying
+	// which came from which.
+	ResubmitCount int
+
 	Deliveries []DeliveryView
 }
 
+// ResubmittedFrom reports that this event is a copy of another.
+func (v EventLogView) ResubmittedFrom() bool {
+	return v.ResubmittedFromID != ""
+}
+
 // BodyShownBytes is how many body bytes the page is actually
 // rendering, which the truncation marker reports beside the
 // true size.
@@ -59,12 +76,13 @@ func (v EventLogView) BodyShownBytes() int {
 // body column arrives already cut to the cap by SQLite, with
 // the true size beside it.
 type eventLogRow struct {
-	ID          string
-	CreatedAt   time.Time
-	Method      string
-	ContentType string
-	Body        []byte
-	BodyBytes   int64
+	ID                string
+	CreatedAt         time.Time
+	Method            string
+	ContentType       string
+	ResubmittedFromID *string
+	Body              []byte
+	BodyBytes         int64
 }
 
 // view projects a loaded row for rendering.
@@ -79,14 +97,20 @@ func (r *eventLogRow) view() EventLogView {
 		body = trimPartialRune(body)
 	}
 
+	var from string
+	if r.ResubmittedFromID != nil {
+		from = *r.ResubmittedFromID
+	}
+
 	return EventLogView{
-		ID:            r.ID,
-		CreatedAt:     r.CreatedAt,
-		Method:        r.Method,
-		ContentType:   r.ContentType,
-		Body:          string(body),
-		BodyBytes:     r.BodyBytes,
-		BodyTruncated: truncated,
+		ID:                r.ID,
+		CreatedAt:         r.CreatedAt,
+		Method:            r.Method,
+		ContentType:       r.ContentType,
+		Body:              string(body),
+		BodyBytes:         r.BodyBytes,
+		BodyTruncated:     truncated,
+		ResubmittedFromID: from,
 	}
 }