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feat: compatible mode for molecule decode #209

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Merged
merged 5 commits into from
May 23, 2025
Merged

feat: compatible mode for molecule decode #209

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e4fe80d
feat: compatible mode for molecule decode
Alive24 May 17, 2025
9dab7b0
fix: minor fixes
Alive24 May 17, 2025
d66a1fb
doc: minor comment
Alive24 May 17, 2025
e570623
fix: improved implementation of compatibility mode based on #209
Alive24 May 19, 2025
3a5b9be
Create olive-dryers-live.md
Hanssen0 May 19, 2025
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65 changes: 39 additions & 26 deletions packages/core/src/molecule/codec.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -18,13 +18,19 @@ import {

export type CodecLike<Encodable, Decoded = Encodable> = {
readonly encode: (encodable: Encodable) => Bytes;
readonly decode: (decodable: BytesLike) => Decoded;
readonly decode: (
decodable: BytesLike,
config?: { compatible?: boolean },
) => Decoded;
readonly byteLength?: number;
};
export class Codec<Encodable, Decoded = Encodable> {
constructor(
public readonly encode: (encodable: Encodable) => Bytes,
public readonly decode: (decodable: BytesLike) => Decoded,
public readonly decode: (
decodable: BytesLike,
config?: { compatible?: boolean },
) => Decoded,
public readonly byteLength?: number, // if provided, treat codec as fixed length
) {}

Expand All @@ -43,7 +49,7 @@ export class Codec<Encodable, Decoded = Encodable> {
}
return encoded;
},
(decodable) => {
(decodable, config = { compatible: false }) => {
const decodableBytes = bytesFrom(decodable);
if (
byteLength !== undefined &&
Expand All @@ -53,7 +59,7 @@ export class Codec<Encodable, Decoded = Encodable> {
`Codec.decode: expected byte length ${byteLength}, got ${decodableBytes.byteLength}`,
);
}
return decode(decodable);
return decode(decodable, config);
},
byteLength,
);
Expand All @@ -69,10 +75,10 @@ export class Codec<Encodable, Decoded = Encodable> {
return new Codec(
(encodable) =>
this.encode((inMap ? inMap(encodable) : encodable) as Encodable),
(buffer) =>
(buffer, config = { compatible: false }) =>
(outMap
? outMap(this.decode(buffer))
: this.decode(buffer)) as NewDecoded,
? outMap(this.decode(buffer, config))
: this.decode(buffer, config)) as NewDecoded,
this.byteLength,
);
}
Expand Down Expand Up @@ -128,7 +134,7 @@ export function fixedItemVec<Encodable, Decoded>(
throw new Error(`fixedItemVec(${e?.toString()})`);
}
},
decode(buffer) {
decode(buffer, config) {
const value = bytesFrom(buffer);
if (value.byteLength < 4) {
throw new Error(
Expand All @@ -147,7 +153,10 @@ export function fixedItemVec<Encodable, Decoded>(
const decodedArray: Array<Decoded> = [];
for (let offset = 4; offset < byteLength; offset += itemByteLength) {
decodedArray.push(
itemCodec.decode(value.slice(offset, offset + itemByteLength)),
itemCodec.decode(
value.slice(offset, offset + itemByteLength),
config,
),
);
}
return decodedArray;
Expand Down Expand Up @@ -185,7 +194,7 @@ export function dynItemVec<Encodable, Decoded>(
throw new Error(`dynItemVec(${e?.toString()})`);
}
},
decode(buffer) {
decode(buffer, config) {
const value = bytesFrom(buffer);
if (value.byteLength < 4) {
throw new Error(
Expand Down Expand Up @@ -215,7 +224,7 @@ export function dynItemVec<Encodable, Decoded>(
const start = offsets[index];
const end = offsets[index + 1];
const itemBuffer = value.slice(start, end);
decodedArray.push(itemCodec.decode(itemBuffer));
decodedArray.push(itemCodec.decode(itemBuffer, config));
}
return decodedArray;
} catch (e) {
Expand Down Expand Up @@ -259,13 +268,13 @@ export function option<Encodable, Decoded>(
throw new Error(`option(${e?.toString()})`);
}
},
decode(buffer) {
decode(buffer, config) {
const value = bytesFrom(buffer);
if (value.byteLength === 0) {
return undefined;
}
try {
return innerCodec.decode(buffer);
return innerCodec.decode(buffer, config);
} catch (e) {
throw new Error(`option(${e?.toString()})`);
}
Expand All @@ -290,7 +299,7 @@ export function byteVec<Encodable, Decoded>(
throw new Error(`byteVec(${e?.toString()})`);
}
},
decode(buffer) {
decode(buffer, config) {
const value = bytesFrom(buffer);
if (value.byteLength < 4) {
throw new Error(
Expand All @@ -304,7 +313,7 @@ export function byteVec<Encodable, Decoded>(
);
}
try {
return codec.decode(value.slice(4));
return codec.decode(value.slice(4), config);
} catch (e: unknown) {
throw new Error(`byteVec(${e?.toString()})`);
}
Expand Down Expand Up @@ -371,15 +380,15 @@ export function table<
const packedTotalSize = uint32To(header.length + body.length + 4);
return bytesConcat(packedTotalSize, header, body);
},
decode(buffer) {
decode(buffer, config) {
const value = bytesFrom(buffer);
if (value.byteLength < 4) {
throw new Error(
`table: too short buffer, expected at least 4 bytes, but got ${value.byteLength}`,
);
}
const byteLength = uint32From(value.slice(0, 4));
if (byteLength !== value.byteLength) {
if (byteLength !== value.byteLength && !config?.compatible) {
throw new Error(
`table: invalid buffer size, expected ${byteLength}, but got ${value.byteLength}`,
);
Expand All @@ -397,9 +406,13 @@ export function table<
const payload = value.slice(start, end);
try {
// eslint-disable-next-line @typescript-eslint/no-unsafe-assignment
Object.assign(object, { [field]: codec.decode(payload) });
} catch (e: unknown) {
throw new Error(`table.${field}(${e?.toString()})`);
Object.assign(object, { [field]: codec.decode(payload, config) });
} catch (_e: unknown) {
if (config?.compatible) {
Object.assign(object, { [field]: null });
} else {
throw new Error(`table.${field}(${_e?.toString()})`);
}
}
}
return object as Decoded;
Expand Down Expand Up @@ -466,7 +479,7 @@ export function union<T extends Record<string, CodecLike<any, any>>>(
throw new Error(`union.(${typeStr})(${e?.toString()})`);
}
},
decode(buffer) {
decode(buffer, config) {
const value = bytesFrom(buffer);
const fieldIndex = uint32From(value.slice(0, 4));
const keys = Object.keys(codecLayout);
Expand Down Expand Up @@ -496,7 +509,7 @@ export function union<T extends Record<string, CodecLike<any, any>>>(
return {
type: field,
// eslint-disable-next-line @typescript-eslint/no-unsafe-assignment
value: codecLayout[field].decode(value.slice(4)),
value: codecLayout[field].decode(value.slice(4), config),
} as UnionDecoded<T>;
},
});
Expand Down Expand Up @@ -535,15 +548,15 @@ export function struct<

return bytesFrom(bytes);
},
decode(buffer) {
decode(buffer, config) {
const value = bytesFrom(buffer);
const object = {};
let offset = 0;
Object.entries(codecLayout).forEach(([key, codec]) => {
const payload = value.slice(offset, offset + codec.byteLength!);
try {
// eslint-disable-next-line @typescript-eslint/no-unsafe-assignment
Object.assign(object, { [key]: codec.decode(payload) });
Object.assign(object, { [key]: codec.decode(payload, config) });
} catch (e: unknown) {
throw new Error(`struct.${key}(${(e as Error).toString()})`);
}
Expand Down Expand Up @@ -583,7 +596,7 @@ export function array<Encodable, Decoded>(
throw new Error(`array(${e?.toString()})`);
}
},
decode(buffer) {
decode(buffer, config) {
const value = bytesFrom(buffer);
if (value.byteLength != byteLength) {
throw new Error(
Expand All @@ -594,7 +607,7 @@ export function array<Encodable, Decoded>(
const result: Array<Decoded> = [];
for (let i = 0; i < value.byteLength; i += itemCodec.byteLength!) {
result.push(
itemCodec.decode(value.slice(i, i + itemCodec.byteLength!)),
itemCodec.decode(value.slice(i, i + itemCodec.byteLength!), config),
);
}
return result;
Expand Down