Rectify DB debug APIs chaindbProperty and chaindbCompact

[hyunsooda]

Proposed changes

Fixed non-functional legacy LevelDB only APIs (debug.chaindbProperty and debug.chaindbCompact). I'll appreciate it if you give an idea to refactor the ugly dummy to a succinct style in shardedDB.

1. debug.chaindbProperty(<property>)

> debug.chaindbProperty("")
  [misc:LevelDB]
Compactions
 Level |   Tables   |    Size(MB)   |    Time(sec)  |    Read(MB)   |   Write(MB)
-------+------------+---------------+---------------+---------------+---------------
   0   |          2 |      13.83005 |       0.21498 |       0.00000 |      34.55984
   1   |         36 |      73.81695 |       0.71184 |      90.47719 |      73.81695
-------+------------+---------------+---------------+---------------+---------------
 Total |         38 |      87.64700 |       0.92682 |      90.47719 |     108.37680
 [header:LevelDB]
Compactions
 Level |   Tables   |    Size(MB)   |    Time(sec)  |    Read(MB)   |   Write(MB)
-------+------------+---------------+---------------+---------------+---------------
   0   |          1 |      18.92433 |       0.56948 |       0.00000 |     151.40663
   1   |         51 |      98.75594 |       0.79978 |     183.49827 |     170.02713
   2   |        419 |     846.74403 |       0.00000 |       0.00000 |       0.00000
-------+------------+---------------+---------------+---------------+---------------
 Total |        471 |     964.42430 |       1.36926 |     183.49827 |     321.43376
 [body:LevelDB]
Compactions
 Level |   Tables   |    Size(MB)   |    Time(sec)  |    Read(MB)   |   Write(MB)
-------+------------+---------------+---------------+---------------+---------------
   1   |          9 |      21.44867 |       0.00000 |       0.00000 |       0.00000
-------+------------+---------------+---------------+---------------+---------------
 Total |          9 |      21.44867 |       0.00000 |       0.00000 |       0.00000
 [receipts:LevelDB]
Compactions
 Level |   Tables   |    Size(MB)   |    Time(sec)  |    Read(MB)   |   Write(MB)
-------+------------+---------------+---------------+---------------+---------------
   1   |          9 |      20.70702 |       0.00000 |       0.00000 |       0.00000
-------+------------+---------------+---------------+---------------+---------------
 Total |          9 |      20.70702 |       0.00000 |       0.00000 |       0.00000
 [statetrie:ShardedDB]
 [shrad0:LevelDB]
Compactions
 Level |   Tables   |    Size(MB)   |    Time(sec)  |    Read(MB)   |   Write(MB)
-------+------------+---------------+---------------+---------------+---------------
   1   |          3 |       5.61462 |       0.00000 |       0.00000 |       0.00000
-------+------------+---------------+---------------+---------------+---------------
 Total |          3 |       5.61462 |       0.00000 |       0.00000 |       0.00000
 [shrad1:LevelDB]
Compactions
 Level |   Tables   |    Size(MB)   |    Time(sec)  |    Read(MB)   |   Write(MB)
-------+------------+---------------+---------------+---------------+---------------
   1   |          3 |       5.54748 |       0.00000 |       0.00000 |       0.00000
-------+------------+---------------+---------------+---------------+---------------
 Total |          3 |       5.54748 |       0.00000 |       0.00000 |       0.00000
 [shrad2:LevelDB]
Compactions
 Level |   Tables   |    Size(MB)   |    Time(sec)  |    Read(MB)   |   Write(MB)
-------+------------+---------------+---------------+---------------+---------------
   1   |          3 |       5.63084 |       0.00000 |       0.00000 |       0.00000
-------+------------+---------------+---------------+---------------+---------------
 Total |          3 |       5.63084 |       0.00000 |       0.00000 |       0.00000
 [shrad3:LevelDB]
Compactions
 Level |   Tables   |    Size(MB)   |    Time(sec)  |    Read(MB)   |   Write(MB)
-------+------------+---------------+---------------+---------------+---------------
   1   |          4 |       6.97252 |       0.00000 |       0.00000 |       0.00000
-------+------------+---------------+---------------+---------------+---------------
 Total |          4 |       6.97252 |       0.00000 |       0.00000 |       0.00000
 [txlookup:LevelDB]
Compactions
 Level |   Tables   |    Size(MB)   |    Time(sec)  |    Read(MB)   |   Write(MB)
-------+------------+---------------+---------------+---------------+---------------
   1   |          1 |       0.10515 |       0.00000 |       0.00000 |       0.00000
-------+------------+---------------+---------------+---------------+---------------
 Total |          1 |       0.10515 |       0.00000 |       0.00000 |       0.00000
 [bridgeservice:LevelDB]
Compactions
 Level |   Tables   |    Size(MB)   |    Time(sec)  |    Read(MB)   |   Write(MB)
-------+------------+---------------+---------------+---------------+---------------
-------+------------+---------------+---------------+---------------+---------------
 Total |          0 |       0.00000 |       0.00000 |       0.00000 |       0.00000
 [snapshot:LevelDB]
Compactions
 Level |   Tables   |    Size(MB)   |    Time(sec)  |    Read(MB)   |   Write(MB)
-------+------------+---------------+---------------+---------------+---------------
-------+------------+---------------+---------------+---------------+---------------
 Total |          0 |       0.00000 |       0.00000 |       0.00000 |       0.00000

null

2. debug.chaindbCompact() manually compacts ldb files.

> debug.chaindbCompact()
> null

Check out the reduced number of ldb files.

3. Removed debug.getDBProperty in favor of debug.chaindbProperty.

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Further comments

If this is a relatively large or complex change, kick off the discussion by explaining why you chose the solution you did and what alternatives you considered, etc...

[hyunsooda]

@blukat29, Removed debug.getDBProperty and debug.chaindbProperty subsumes the information of the removed API.

[blukat29]

PTAL @jeongkyun-oh. We're changing the API you've added.

[jeongkyun-oh]

@blukat29 The added API debug.getDBProperty is used for debugging purpose. It can be removed.