c3c10f1615 wallet: implement optional cache validation (Matt Whitlock)
5bc7eb4b8e wallet: add persistent cache, mapping path->(priv, pub, script, addr) (Matt Whitlock)
01ec2a4181 wallet: add _addr_map, paralleling _script_map (Matt Whitlock)
64f18bce18 get_imported_privkey_branch: use O(m+n) algorithm instead of O(m*n) (Matt Whitlock)
77f0194a37 wallet_utils: use new get_utxos_at_mixdepth method (Matt Whitlock)
184d76f7f7 wallet: add get_{balance,utxos}_at_mixdepth methods (Matt Whitlock)
fc1e00058b wallet_showutxos: use O(1) check for frozen instead of O(n) (Matt Whitlock)
b58ac679cb wallet: drop _get_addr_int_ext; replace with calls to get_new_addr (Matt Whitlock)
2c38a813fc wallet: delete redundant get_script and get_addr methods (Matt Whitlock)
574c29e899 wallet: hoist get_script_from_path default impl into BaseWallet (Matt Whitlock)
8245271d7f wallet: avoid IndexError in _is_my_bip32_path (Matt Whitlock)
48aec83d76 wallet: remove a dead store in get_index_cache_and_increment (Matt Whitlock)
Pull request description:
**Note:** Reviewing each commit individually will make more sense than trying to review the combined diff.
This PR implements several performance enhancements that take the CPU time to run `wallet-tool.py display` on my wallet down from ~44 minutes to ~11 seconds.
The most significant gains come from replacing an **O**(_m_*_n_) algorithm in `get_imported_privkey_branch` with a semantically equivalent **O**(_m_+_n_) algorithm and from adding a persistent cache for computed private keys, public keys, scripts, and addresses.
Below are some actual benchmarks on my wallet, which has 5 mixdepths, each having path indices reaching into the 4000s, and almost 700 imported private keys.
* 673fbfb9a5 `origin/master` (baseline)
```
user 44m3.618s
sys 0m6.375s
```
* 48aec83d76 `wallet`: remove a dead store in `get_index_cache_and_increment`
* fbb681a207be465fb53b43ac18a2b52c8a4a6323 `wallet`: add `get_{balance,utxos}_at_mixdepth` methods
* 75a970378579bb04f189e8d9eca22e5e2aadb0b4 `wallet_utils`: use new `get_utxos_at_mixdepth` method
```
user 42m14.464s
sys 0m3.355s
```
* 84966e628d510ddf0cadba170346ea926dc06000 `wallet_showutxos`: use **O**(1) check for frozen instead of **O**(_n_)
* 75c5a75468a6de88e64c4af7a8226c633d358fd5 `get_imported_privkey_branch`: use **O**(_m_+_n_) algorithm instead of **O**(_m_*_n_)
```
user 5m0.045s
sys 0m0.453s
```
* da8daf048369081d882fb591d50583559a2284f0 `wallet`: add `_addr_map`, paralleling `_script_map`
```
user 4m56.175s
sys 0m0.423s
```
* d8aa1afe6f0ec596bb133f594ae88cc2fffb6ad2 `wallet`: add persistent cache, mapping path->(priv, pub, script, addr)
```
user 1m42.272s
sys 0m0.471s
```
* After running another command to modify the wallet file so as to persist the cache, `wallet-tool.py display` now runs in:
```
user 0m11.141s
sys 0m0.225s
```
ACKs for top commit:
AdamISZ:
tACK c3c10f1615
Tree-SHA512: fdd20d436d8f16a1e4270011ad1ba4bf6393f876eb7413da30f75d5830249134911d5d93cab8051c0bf107c213d4cd46ba9614ae23eef4566f867ff1b912fc9b
Adam Gibson