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feat: Allow to decode t as opt t #716

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feat: Allow to decode t as opt t #716

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2 changes: 1 addition & 1 deletion docs/generated/changelog.html
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Original file line number Diff line number Diff line change
Expand Up @@ -12,7 +12,7 @@ <h1>Agent-JS Changelog</h1>
<section>
<h2>Version x.x.x</h2>
<ul>
<li></li>
<li>feat: Add support for type coercion of `t` to `opt t` when decoding candid values.</li>
</ul>
<h2>Version 0.15.5</h2>
<ul>
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17 changes: 16 additions & 1 deletion packages/candid/src/idl.test.ts
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Expand Up @@ -180,7 +180,9 @@ test('IDL encoding (arraybuffer)', () => {
IDL.encode([IDL.Vec(IDL.Nat8)], [new Uint8Array()]);
IDL.encode([IDL.Vec(IDL.Nat8)], [new Uint8Array(100).fill(42)]);
IDL.encode([IDL.Vec(IDL.Nat16)], [new Uint16Array(200).fill(42)]);
expect(() => IDL.encode([IDL.Vec(IDL.Int8)], [new Uint16Array(10).fill(420)])).toThrow(/Invalid vec int8 argument/);
expect(() => IDL.encode([IDL.Vec(IDL.Int8)], [new Uint16Array(10).fill(420)])).toThrow(
/Invalid vec int8 argument/,
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The formatter insists on this change.

);
});

test('IDL encoding (array)', () => {
Expand Down Expand Up @@ -677,3 +679,16 @@ test('should decode matching optional fields if wire type contains additional fi
b: ['123'],
});
});

test('should coerce value to opt value', () => {
const encoded = IDL.encode([IDL.Text], ['hello']);
const value = IDL.decode([IDL.Opt(IDL.Text)], encoded)[0] as [string];
expect(value).toEqual(['hello']);
});

test('should not coerce nested opt opt', () => {
const encoded = IDL.encode([IDL.Text], ['hello']);
expect(() => IDL.decode([IDL.Opt(IDL.Opt(IDL.Text))], encoded)).toThrow(
'type mismatch: type on the wire text, expect type opt opt text',
);
});
17 changes: 16 additions & 1 deletion packages/candid/src/idl.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -914,10 +914,25 @@ export class OptClass<T> extends ConstructType<[T] | []> {
typeTable.add(this, concat(opCode, buffer));
}

public checkType(t: Type): Type {
try {
return super.checkType(t);
} catch (e) {
// try to coerce t to opt t
if (!(t instanceof OptClass) && !(this._type instanceof OptClass)) {
if (this._type.checkType(t)) {
return t;
}
}
// rethrow if opt coercion is not applicable
throw e;
}
}

public decodeValue(b: Pipe, t: Type): [T] | [] {
const opt = this.checkType(t);
if (!(opt instanceof OptClass)) {
throw new Error('Not an option type');
return [this._type.decodeValue(b, opt)];
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@stopak stopak May 9, 2023 •
edited
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I did some tests, and this should be a little bit different

    const type = Rec()
    type._type = opt

    return [this._type.decodeValue(b, type)];

Otherwise this will throw another error

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Thanks. Could you provide a full test-case of an input the crashes with the current code but succeeds using your suggested change?
It would be helpful to add it to the actual test suite.

}
switch (safeReadUint8(b)) {
case 0:
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