blockstore-core/dist/src/identity.js

Contains various implementations of the API contract described in interface-blockstore

import { NotFoundError } from 'interface-store';
import { BaseBlockstore } from "./base.js";
// https://github.com/multiformats/multicodec/blob/d06fc6194710e8909bac64273c43f16b56ca4c34/table.csv#L2
const IDENTITY_CODEC = 0x00;
class IdentityHashDigestTooLongError extends Error {
    static name = 'IdentityHashDigestTooLongError';
    name = 'IdentityHashDigestTooLongError';
}
export class IdentityBlockstore extends BaseBlockstore {
    child;
    maxDigestLength;
    constructor(child, init) {
        super();
        this.child = child;
        this.maxDigestLength = init?.maxDigestLength;
    }
    put(key, block, options) {
        if (key.multihash.code === IDENTITY_CODEC) {
            if (this.maxDigestLength != null && key.multihash.digest.byteLength > this.maxDigestLength) {
                throw new IdentityHashDigestTooLongError(`Identity digest too long - ${key.multihash.digest.byteLength} > this.maxDigestLength`);
            }
            options?.signal?.throwIfAborted();
            return key;
        }
        if (this.child == null) {
            options?.signal?.throwIfAborted();
            return key;
        }
        return this.child.put(key, block, options);
    }
    async *get(key, options) {
        if (key.multihash.code === IDENTITY_CODEC) {
            if (this.maxDigestLength != null && key.multihash.digest.byteLength > this.maxDigestLength) {
                throw new IdentityHashDigestTooLongError(`Identity digest too long - ${key.multihash.digest.byteLength} > this.maxDigestLength`);
            }
            options?.signal?.throwIfAborted();
            yield key.multihash.digest;
            return;
        }
        if (this.child == null) {
            options?.signal?.throwIfAborted();
            throw new NotFoundError();
        }
        yield* this.child.get(key, options);
    }
    has(key, options) {
        if (key.multihash.code === IDENTITY_CODEC) {
            if (this.maxDigestLength != null && key.multihash.digest.byteLength > this.maxDigestLength) {
                throw new IdentityHashDigestTooLongError(`Identity digest too long - ${key.multihash.digest.byteLength} > this.maxDigestLength`);
            }
            options?.signal?.throwIfAborted();
            return true;
        }
        if (this.child == null) {
            options?.signal?.throwIfAborted();
            return false;
        }
        return this.child.has(key, options);
    }
    delete(key, options) {
        if (key.code === IDENTITY_CODEC) {
            if (this.maxDigestLength != null && key.multihash.digest.byteLength > this.maxDigestLength) {
                throw new IdentityHashDigestTooLongError(`Identity digest too long - ${key.multihash.digest.byteLength} > this.maxDigestLength`);
            }
            options?.signal?.throwIfAborted();
            return;
        }
        if (this.child != null) {
            return this.child.delete(key, options);
        }
    }
    async *getAll(options) {
        if (this.child != null) {
            yield* this.child.getAll(options);
        }
        options?.signal?.throwIfAborted();
    }
}
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