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MarcoFalke 561ec27683 Merge #10781 : Python cleanups `78214588d` Use for-loop instead of list comprehension (practicalswift) `823979436` Use the variable name _ for unused return values (practicalswift) `2e6080bbf` Remove unused variables and/or function calls (practicalswift) `9b94054b7` Avoid reference to undefined name: stderr does not exist, sys.stderr does (practicalswift) `51cb6b822` Use print(...) instead of undefined printf(...) (practicalswift) `25cd520fc` Use sys.exit(...) instead of exit(...): exit(...) should not be used in programs (practicalswift) Pull request description: Python cleanups: * Avoid reference to undefined name: `stderr` does not exist, `sys.stderr` does * Use `print(...)` instead of undefined `printf(...)` * Avoid redefinition of variable (`tx`) in list comprehension * Remove unused variables and/or function calls * Use `sys.exit(...)` instead of `exit(...)`: [`exit(...)` should not be used in programs](https://github.com/bitcoin/bitcoin/pull/10753#discussion_r125935027) Tree-SHA512: 1238dfbc1d20f7edadea5e5406a589f293065638f6234809f0d5b6ba746dffe3d276bc5884c7af388a6c798c61a8759faaccf57f381225644754c0f61914eb4b		2020-01-02 22:01:29 -06:00
..
example-linearize-testnet.cfg
example-linearize.cfg
linearize-data.py
linearize-hashes.py	Merge #10781 : Python cleanups	2020-01-02 22:01:29 -06:00
README.md	Merge #10956 : Fix typos	2020-01-01 21:31:39 -06:00

Linearize

Construct a linear, no-fork, best version of the Dash blockchain. The scripts run using Python 3 but are compatible with Python 2.

Step 0: Install dash_hash

$ ./linearize-hashes.py linearize.cfg > hashlist.txt

Required configuration file settings for linearize-hashes:

Optional config file setting for linearize-hashes:

RPC: host (Default: 127.0.0.1)
RPC: port (Default: 9998)
Blockchain: min_height, max_height
rev_hash_bytes: If true, the written block hash list will be byte-reversed. (In other words, the hash returned by getblockhash will have its bytes reversed.) False by default. Intended for generation of standalone hash lists but safe to use with linearize-data.py, which will output the same data no matter which byte format is chosen.

The linearize-hashes script requires a connection, local or remote, to a JSON-RPC server. Running dashd or dash-qt -server will be sufficient.

$ ./linearize-data.py linearize.cfg

Required configuration file settings:

Optional config file setting for linearize-data:

debug_output: Some printouts may not always be desired. If true, such output will be printed.
file_timestamp: Set each file's last-accessed and last-modified times, respectively, to the current time and to the timestamp of the most recent block written to the script's blockchain.
genesis: The hash of the genesis block in the blockchain. (default is '00000ffd590b1485b3caadc19b22e6379c733355108f107a430458cdf3407ab6', mainnet)
input: dashd blocks/ directory containing blkNNNNN.dat
hashlist: text file containing list of block hashes created by linearize-hashes.py.
max_out_sz: Maximum size for files created by the output_file option. (Default: 1000*1000*1000 bytes)
netmagic: Network magic number. (default is 'bf0c6bbd', mainnet)
out_of_order_cache_sz: If out-of-order blocks are being read, the block can be written to a cache so that the blockchain doesn't have to be sought again. This option specifies the cache size. (Default: 100*1000*1000 bytes)
rev_hash_bytes: If true, the block hash list written by linearize-hashes.py will be byte-reversed when read by linearize-data.py. See the linearize-hashes entry for more information.
split_timestamp: Split blockchain files when a new month is first seen, in addition to reaching a maximum file size (max_out_sz).