85 lines
2.0 KiB
Rust
85 lines
2.0 KiB
Rust
use util::migration::Migration;
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/// This migration reduces the sizes of keys and moves `ExtrasIndex` byte from back to the front.
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pub struct ToV6;
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impl ToV6 {
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fn migrate_old_key(&self, old_key: Vec<u8>, index: u8, len: usize) -> Vec<u8> {
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let mut result = vec![];
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result.reserve(len);
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unsafe {
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result.set_len(len);
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}
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result[0] = index;
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let old_key_start = 33 - len;
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result[1..].clone_from_slice(&old_key[old_key_start..32]);
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result
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}
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}
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impl Migration for ToV6 {
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fn version(&self) -> u32 {
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6
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}
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fn simple_migrate(&self, key: Vec<u8>, value: Vec<u8>) -> Option<(Vec<u8>, Vec<u8>)> {
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//// at this version all extras keys are 33 bytes long.
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if key.len() == 33 {
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// block details key changes:
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// - index is moved to the front
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if key[32] == 0 {
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return Some((self.migrate_old_key(key, 0, 33), value));
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}
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// block hash key changes:
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// - key is shorter 33 -> 5 bytes
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// - index is moved to the front
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if key[32] == 1 {
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return Some((self.migrate_old_key(key, 1, 5), value));
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}
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// transaction addresses changes:
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// - index is moved to the front
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if key[32] == 2 {
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return Some((self.migrate_old_key(key, 2, 33), value));
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}
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// block log blooms are removed
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if key[32] == 3 {
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return None;
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}
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// blocks blooms key changes:
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// - key is shorter 33 -> 6 bytes
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// - index is moved to the front
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// - index is changed 4 -> 3
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if key[32] == 4 {
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// i have no idea why it was reversed
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let reverse = key.into_iter().rev().collect::<Vec<_>>();
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let mut result = [0u8; 6];
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// new extras index is 3
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result[0] = 3;
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// 9th (+ prefix) byte was the level. Now it's second.
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result[1] = reverse[9];
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result[2] = reverse[4];
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result[3] = reverse[3];
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result[4] = reverse[2];
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result[5] = reverse[1];
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return Some((result.to_vec(), value));
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}
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// blocks receipts key changes:
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// - index is moved to the front
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// - index is changed 5 -> 4
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if key[32] == 5 {
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return Some((self.migrate_old_key(key, 4, 33), value));
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}
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}
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Some((key, value))
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}
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}
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