Lőrinc
d7de5b109f
logs: show reindex progress in ImportBlocks
...
### Summary
When triggering a reindex, users had no indication of how many files remained or how far along the process was.
### Fix
This patch prefetches the target file block file count to be able to show progress information.
Instead of just displaying which block file is being processed, it now indicates how many files remain.
### Reproducer + expected results
Running
```bash
cmake -B build && make -C build -DCMAKE_BUILD_TYPE=Release && ./build/bin/bitcoind -datadir=demo -reindex
```
Shows the block files one-by-one currently, there's no way to see how much work is left:
```
Reindexing block file blk00000.dat...
Loaded 119920 blocks from external file in 1228ms
Reindexing block file blk00001.dat...
Loaded 10671 blocks from external file in 284ms
Reindexing block file blk00002.dat...
Loaded 5459 blocks from external file in 263ms
Reindexing block file blk00003.dat...
Loaded 5595 blocks from external file in 267ms
```
After the change:
```
Reindexing block file blk00000.dat (0% complete)...
Loaded 119920 blocks from external file in 1255ms
Reindexing block file blk00001.dat (1% complete)...
Loaded 10671 blocks from external file in 303ms
Reindexing block file blk00002.dat (2% complete)...
Loaded 5459 blocks from external file in 278ms
Reindexing block file blk00003.dat (3% complete)...
Loaded 5595 blocks from external file in 285ms
```
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