Fix Share stats disappearing regression

api/internal/logmon/tailer.go

@@ -570,6 +570,66 @@ func FindBestPowData(path string) (best *PowData, bestAt time.Time, seen, unpars
 	return best, bestAt, seen, unparseable, err
 }
 
+// ShareStats is a full accounting of the accepted and rejected shares
+// recorded in a ckpool log, used to rebuild the all-time counters when
+// the stored ones are lost or truncated. Diffs holds each accepted
+// share's difficulty in log order so the caller can bucket them with
+// its own thresholds rather than duplicating that policy here.
+type ShareStats struct {
+	Accepted      int64
+	DiffSum       float64
+	Diffs         []float64
+	RejectReasons map[string]int64
+}
+
+// ScanShareStats reads an entire ckpool log and tallies every accepted
+// and rejected share it contains. On a busy pool this walks millions of
+// lines, so it is meant for explicit recovery, never for the startup
+// path.
+func ScanShareStats(path string) (*ShareStats, error) {
+	f, err := os.Open(path)
+	if err != nil {
+		return nil, err
+	}
+	defer f.Close()
+
+	st := &ShareStats{RejectReasons: make(map[string]int64)}
+	err = scanLines(f, func(line string) {
+		if strings.Contains(line, "Accepted client") {
+			m := acceptedShareRE.FindStringSubmatch(line)
+			if m == nil {
+				return
+			}
+			d, perr := strconv.ParseFloat(m[1], 64)
+			if perr != nil {
+				return
+			}
+			st.Accepted++
+			st.DiffSum += d
+			st.Diffs = append(st.Diffs, d)
+			return
+		}
+		if !strings.Contains(line, "Rejected client") {
+			return
+		}
+		if m := rejectedDiffRE.FindStringSubmatch(line); m != nil {
+			st.RejectReasons[rejectKeyword(m[1])]++
+			return
+		}
+		if m := rejectedInvalRE.FindStringSubmatch(line); m != nil {
+			reason := strings.TrimSpace(m[1])
+			if reason == "" {
+				reason = "Unknown"
+			}
+			st.RejectReasons[reason]++
+		}
+	})
+	if err != nil {
+		return nil, err
+	}
+	return st, nil
+}
+
 // sleep returns false if ctx was cancelled during the wait.
 func sleep(ctx context.Context, d time.Duration) bool {
 	select {