From bc2d8798e70f0667baa8598b58d9873aeb55a507 Mon Sep 17 00:00:00 2001
From: Christian Mollekopf <chrigi_1@fastmail.fm>
Date: Tue, 21 Nov 2017 16:48:06 +0100
Subject: Print transaction span

---
 common/storage_lmdb.cpp | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/common/storage_lmdb.cpp b/common/storage_lmdb.cpp
index 392ac0a..6923d7c 100644
--- a/common/storage_lmdb.cpp
+++ b/common/storage_lmdb.cpp
@@ -768,15 +768,29 @@ DataStore::Transaction::Stat DataStore::Transaction::stat()
     while ((rc = mdb_cursor_get(cursor, &key, &data, MDB_NEXT)) == 0) {
         iptr = static_cast<size_t*>(data.mv_data);
         freePages += *iptr;
+        bool bad = false;
         size_t pg, prev;
         ssize_t i, j, span = 0;
         j = *iptr++;
         for (i = j, prev = 1; --i >= 0; ) {
             pg = iptr[i];
+            if (pg <= prev) {
+                bad = true;
+            }
             prev = pg;
             pg += span;
             for (; i >= span && iptr[i-span] == pg; span++, pg++) ;
         }
+        std::cout << "    Transaction " << *(size_t *)key.mv_data << ", "<< j << " pages, maxspan " << span << (bad ? " [bad sequence]" : "") << std::endl;
+        for (--j; j >= 0; ) {
+            pg = iptr[j];
+            for (span=1; --j >= 0 && iptr[j] == pg+span; span++);
+            if (span > 1) {
+                std::cout << "     " << pg << "[" << span << "]\n";
+            } else {
+                std::cout << "     " << pg << std::endl;
+            }
+        }
     }
     mdb_cursor_close(cursor);
     return {mei.me_last_pgno + 1, freePages, mst.ms_psize, mainStat, freeStat};
-- 
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