leveldb_cat

leveldb_cat.py

#!/bin/env python3

import sys
try:
    import plyvel
except ImportError:
    print("Install plyvel: python3 -m pip install plyvel")
    sys.exit(1)

def usage():
    print(f"usage: {sys.argv[0]} [-h/--help] [--hex-keys] [--hex-values] path")
    sys.exit(1)

if "--help" in sys.argv or "-h" in sys.argv or len(sys.argv) <= 1:
    usage()

path = next((v for v in sys.argv[1:] if not v.startswith('-')), None)
if path is None:
    usage()

identity = lambda x: str(x.decode())
as_hex = lambda x: x.hex()
fk = as_hex if "--hex-keys" in sys.argv else identity
fv = as_hex if "--hex-values" in sys.argv else identity

db = plyvel.DB(path, create_if_missing=False)
try:
    for key, value in db:
        print(f"{fk(key)} -> {fv(value)}")
except UnicodeDecodeError:
    print("Cannot show key or value, try --hex-keys or --hex-values", file=sys.stderr)