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import {Writer} from '@jsonjoy.com/buffers/lib/Writer';
import {CborJsonValueCodec} from '@jsonjoy.com/json-pack/lib/codecs/cbor';
import {AvlMap} from 'sonic-forest/lib/avl/AvlMap';
import {Mutex} from '../../../../util/Mutex';
import type {AbstractBatchOperation, AbstractLevel} from 'abstract-level';
import type {JsonValueCodec} from '@jsonjoy.com/json-pack/lib/codecs/types';
import type * as types from '../types';
type BinStrLevel = AbstractLevel<any, string, Uint8Array>;
type BinStrLevelOperation = AbstractBatchOperation<BinStrLevel, string, Uint8Array>;
export class LevelStore implements types.Store {
constructor(
protected readonly kv: BinStrLevel,
protected readonly codec: JsonValueCodec = new CborJsonValueCodec(new Writer() as any),
protected readonly mutex: Mutex = new Mutex(),
) {}
protected keyBase(id: string) {
return 'b!' + id + '!';
}
protected endKey(id: string) {
return this.keyBase(id) + 'e';
}
protected startKey(id: string) {
return this.keyBase(id) + 's';
}
protected batchBase(id: string) {
return this.keyBase(id) + 'b!';
}
protected batchKey(id: string, seq: number) {
const seqFormatted = seq.toString(36).padStart(6, '0');
return this.batchBase(id) + seqFormatted;
}
protected touchKeyBase() {
return 'u!';
}
protected touchKey(id: string) {
return this.touchKeyBase() + id + '!';
}
/** @todo Add in-memory cache on read. */
public async get(id: string): Promise<types.StoreGetResult | undefined> {
const key = this.endKey(id);
try {
const blob = await this.kv.get(key);
if (!blob) return;
const block = this.codec.decoder.decode(blob) as types.StoreBlock;
return {block};
} catch (error) {
if (error && typeof error === 'object' && (error as any).code === 'LEVEL_NOT_FOUND') return;
throw error;
}
}
public async getSnapshot(
id: string,
seq: number,
): Promise<{snapshot: types.StoreSnapshot; batches: types.StoreBatch[]}> {
const {kv, codec} = this;
const {decoder} = codec;
const key = this.startKey(id);
try {
const blob = await kv.get(key);
const snapshot = decoder.decode(blob as any) as types.StoreSnapshot;
const batches: types.StoreBatch[] = [];
if (snapshot.seq < seq) {
const gte = this.batchKey(id, snapshot.seq + 1);
const lte = this.batchKey(id, seq);
for await (const blob of kv.values({gte, lte: lte})) {
const batch = decoder.decode(blob) as types.StoreBatch;
batches.push(batch);
}
}
return {snapshot, batches};
} catch (error) {
if (error && typeof error === 'object' && (error as any).code === 'LEVEL_NOT_FOUND') throw RpcError.notFound();
throw error;
}
}
public async exists(id: string): Promise<boolean> {
const key = this.endKey(id);
const existing = await this.kv.keys({gte: key, lte: key, limit: 1}).all();
return existing && existing.length > 0;
}
public async seq(id: string): Promise<number | undefined> {
return await this.mutex.acquire(id, async () => {
const base = this.batchBase(id);
const keys = await this.kv.keys({gte: base, lt: base + '~', limit: 1, reverse: true}).all();
if (!keys || keys.length < 1) return;
const key = keys[0].slice(base.length);
Iif (!key) return;
const seq = Number.parseInt(key, 36);
Iif (seq !== seq) return;
return seq;
});
}
public async create(
start: types.StoreSnapshot,
end: types.StoreSnapshot,
incomingBatch?: types.StoreIncomingBatch,
): Promise<types.StoreCreateResult> {
if (incomingBatch) {
const {patches} = incomingBatch;
Iif (!Array.isArray(patches) || patches.length < 1) throw new Error('NO_PATCHES');
}
const {id} = end;
const key = this.endKey(id);
const now = end.ts;
const encoder = this.codec.encoder;
return await this.mutex.acquire(id, async () => {
const existing = await this.kv.keys({gte: key, lte: key, limit: 1}).all();
if (existing && existing.length > 0) throw RpcError.conflict();
const block: types.StoreBlock = {id, snapshot: end, tip: [], ts: now, uts: now};
const ops: BinStrLevelOperation[] = [
{type: 'put', key: this.startKey(id), value: encoder.encode(start)},
{type: 'put', key, value: encoder.encode(block)},
{type: 'put', key: this.touchKey(id), value: encoder.encode(now)},
];
const response: types.StoreCreateResult = {block};
if (incomingBatch) {
const {cts, patches} = incomingBatch;
const batch: types.StoreBatch = {
seq: 0,
ts: end.ts,
patches,
};
Iif (cts !== void 0) batch.cts = cts;
const batchBlob = encoder.encode(batch);
const batchKey = this.batchKey(id, 0);
ops.push({type: 'put', key: batchKey, value: batchBlob});
response.batch = batch;
}
await this.kv.batch(ops);
return response;
});
}
public async push(
snapshot0: types.StoreIncomingSnapshot,
batch0: types.StoreIncomingBatch,
): Promise<types.StorePushResult> {
const {id, seq} = snapshot0;
const {patches} = batch0;
Iif (!Array.isArray(patches) || !patches.length) throw new Error('NO_PATCHES');
return await this.mutex.acquire(id, async () => {
const block = await this.get(id);
Iif (!block) throw RpcError.notFound();
const blockData = block.block;
const snapshot = blockData.snapshot;
Iif (snapshot.seq + 1 !== seq) throw new Error('PATCH_SEQ_INV');
const now = Date.now();
blockData.uts = now;
snapshot.seq = seq;
snapshot.ts = now;
snapshot.blob = snapshot0.blob;
const encoder = this.codec.encoder;
const batch1: types.StoreBatch = {
seq,
ts: now,
patches,
};
const cts = batch0.cts;
Iif (cts !== void 0) batch1.cts = cts;
const ops: BinStrLevelOperation[] = [
{type: 'put', key: this.endKey(id), value: encoder.encode(blockData)},
{type: 'put', key: this.batchKey(id, seq), value: encoder.encode(batch1)},
{type: 'put', key: this.touchKey(id), value: encoder.encode(now)},
];
await this.kv.batch(ops);
return {snapshot, batch: batch1};
});
}
public async compact(id: string, to: number, advance: types.Advance): Promise<void> {
const {kv, codec} = this;
const {encoder, decoder} = codec;
const key = this.startKey(id);
await this.mutex.acquire(id + '.trunc', async () => {
const start = decoder.decode((await kv.get(key)) as any) as types.StoreSnapshot;
Iif (start.seq >= to) return;
const gt = this.batchKey(id, start.seq);
const lte = this.batchKey(id, to);
const ops: BinStrLevelOperation[] = [];
async function* iterator() {
for await (const [key, blob] of kv.iterator({gt, lte})) {
ops.push({type: 'del', key});
yield decoder.decode(blob) as types.StoreBatch;
}
}
start.blob = await advance(start.blob, iterator());
start.ts = Date.now();
start.seq = to;
ops.push({type: 'put', key, value: encoder.encode(start)});
await kv.batch(ops);
});
}
public async scan(id: string, min: number, max: number): Promise<types.StoreBatch[]> {
const from = this.batchKey(id, min);
const to = this.batchKey(id, max);
const list: types.StoreBatch[] = [];
const decoder = this.codec.decoder;
for await (const blob of this.kv.values({gte: from, lte: to})) {
const batch = decoder.decode(blob) as types.StoreBatch;
list.push(batch);
}
return list;
}
public async remove(id: string): Promise<boolean> {
const exists = await this.exists(id);
if (!exists) return false;
const base = this.keyBase(id);
const touchKey = this.touchKey(id);
const kv = this.kv;
const success = await this.mutex.acquire(id, async () => {
await Promise.allSettled([
kv.clear({
gte: base,
lte: base + '~',
}),
kv.del(touchKey),
]);
return true;
});
return success;
}
/** @todo Make this method async and return something useful. */
public stats(): {blocks: number; batches: number} {
return {blocks: 0, batches: 0};
}
/**
* @todo Need to add GC tests.
*/
public async removeAccessedBefore(ts: number, limit: number = 10): Promise<void> {
const keyBase = this.touchKeyBase();
const from = keyBase + '';
const to = keyBase + '~';
const decoder = this.codec.decoder;
let cnt = 0;
for await (const [key, blob] of this.kv.iterator({gte: from, lte: to})) {
const value = Number(decoder.decode(blob));
if (value >= ts) continue;
cnt++;
const id = key.slice(keyBase.length, -1);
this.remove(id).catch(() => {});
Iif (cnt >= limit) return;
}
}
public async removeOldest(x: number): Promise<void> {
const heap = new AvlMap<number, string>((a, b) => b - a);
const keyBase = this.touchKeyBase();
const gte = keyBase + '';
const lte = keyBase + '~';
const kv = this.kv;
const decoder = this.codec.decoder;
let first = heap.first();
for await (const [key, value] of kv.iterator({gte, lte})) {
const time = decoder.decode(value) as number;
if (heap.size() < x) {
heap.set(time, key);
continue;
}
if (!first) first = heap.first();
if (first && time < first.k) {
heap.del(first.k);
first = undefined;
heap.set(time, key);
}
}
Iif (!heap.size()) return;
for (const {v} of heap.entries()) {
try {
const id = v.slice(keyBase.length, -1);
await this.remove(id);
} catch {}
}
}
public async stop() {
await this.kv.close();
}
}
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