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Promise resolver and promise result (#76)
* Promise resolver and promise result * update persistent value to match master * Add docs, test and Exception types * remove the exception error functions * add test for when value is not a promise * update changelog
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,87 @@ | ||
| // Copyright 2021 Roger Chapman and the v8go contributors. All rights reserved. | ||
| // Use of this source code is governed by a BSD-style license that can be | ||
| // found in the LICENSE file. | ||
|
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| package v8go | ||
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| // #include <stdlib.h> | ||
| // #include "v8go.h" | ||
| import "C" | ||
| import ( | ||
| "errors" | ||
| ) | ||
|
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| // PromiseState is the state of the Promise. | ||
| type PromiseState int | ||
|
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| const ( | ||
| Pending PromiseState = iota | ||
| Fulfilled | ||
| Rejected | ||
| ) | ||
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| // PromiseResolver is the resolver object for the promise. | ||
| // Most cases will create a new PromiseResolver and return | ||
| // the associated Promise from the resolver. | ||
| type PromiseResolver struct { | ||
| *Object | ||
| prom *Promise | ||
| } | ||
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| // Promise is the JavaScript promise object defined in ES6 | ||
| type Promise struct { | ||
| *Object | ||
| } | ||
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| // MewPromiseResolver creates a new Promise resolver for the given context. | ||
| // The associated Promise will be in a Pending state. | ||
| func NewPromiseResolver(ctx *Context) (*PromiseResolver, error) { | ||
| if ctx == nil { | ||
| return nil, errors.New("v8go: Context is required") | ||
| } | ||
| ptr := C.NewPromiseResolver(ctx.ptr) | ||
| val := &Value{ptr, ctx} | ||
| return &PromiseResolver{&Object{val}, nil}, nil | ||
| } | ||
|
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| // GetPromise returns the associated Promise object for this resolver. | ||
| // The Promise object is unique to the resolver and returns the same object | ||
| // on multiple calls. | ||
| func (r *PromiseResolver) GetPromise() *Promise { | ||
| if r.prom == nil { | ||
| ptr := C.PromiseResolverGetPromise(r.ptr) | ||
| val := &Value{ptr, r.ctx} | ||
| r.prom = &Promise{&Object{val}} | ||
| } | ||
| return r.prom | ||
| } | ||
|
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| // Resolve invokes the Promise resolve state with the given value. | ||
| // The Promise state will transition from Pending to Fulfilled. | ||
| func (r *PromiseResolver) Resolve(val Valuer) bool { | ||
| r.ctx.register() | ||
| defer r.ctx.deregister() | ||
| return C.PromiseResolverResolve(r.ptr, val.value().ptr) != 0 | ||
| } | ||
|
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| // Reject invokes the Promise reject state with the given value. | ||
| // The Promise state will transition from Pending to Rejected. | ||
| func (r *PromiseResolver) Reject(err *Value) bool { | ||
| r.ctx.register() | ||
| defer r.ctx.deregister() | ||
| return C.PromiseResolverReject(r.ptr, err.ptr) != 0 | ||
| } | ||
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| // State returns the current state of the Promise. | ||
| func (p *Promise) State() PromiseState { | ||
| return PromiseState(C.PromiseState(p.ptr)) | ||
| } | ||
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| // Result is the value result of the Promise. The Promise must | ||
| // NOT be in a Pending state, otherwise may panic. Call promise.State() | ||
| // to validate state before calling for the result. | ||
| func (p *Promise) Result() *Value { | ||
| ptr := C.PromiseResult(p.ptr) | ||
| val := &Value{ptr, p.ctx} | ||
| return val | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,47 @@ | ||
| // Copyright 2021 Roger Chapman and the v8go contributors. All rights reserved. | ||
| // Use of this source code is governed by a BSD-style license that can be | ||
| // found in the LICENSE file. | ||
|
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| package v8go_test | ||
|
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| import ( | ||
| "testing" | ||
|
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| "rogchap.com/v8go" | ||
| ) | ||
|
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| func TestPromise(t *testing.T) { | ||
| t.Parallel() | ||
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| iso, _ := v8go.NewIsolate() | ||
| ctx, _ := v8go.NewContext(iso) | ||
| if _, err := v8go.NewPromiseResolver(nil); err == nil { | ||
| t.Error("expected error with <nil> Context") | ||
| } | ||
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| res1, _ := v8go.NewPromiseResolver(ctx) | ||
| prom1 := res1.GetPromise() | ||
| if s := prom1.State(); s != v8go.Pending { | ||
| t.Errorf("unexpected state for Promise, want Pending (0) got: %v", s) | ||
| } | ||
|
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| val1, _ := v8go.NewValue(iso, "foo") | ||
| res1.Resolve(val1) | ||
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| if s := prom1.State(); s != v8go.Fulfilled { | ||
| t.Fatalf("unexpected state for Promise, want Fulfilled (1) got: %v", s) | ||
| } | ||
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| if result := prom1.Result(); result.String() != val1.String() { | ||
| t.Errorf("expected the Promise result to match the resolve value, but got: %s", result) | ||
| } | ||
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| res2, _ := v8go.NewPromiseResolver(ctx) | ||
| val2, _ := v8go.NewValue(iso, "Bad Foo") | ||
| res2.Reject(val2) | ||
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| prom2 := res2.GetPromise() | ||
| if s := prom2.State(); s != v8go.Rejected { | ||
| t.Fatalf("unexpected state for Promise, want Rejected (2) got: %v", s) | ||
| } | ||
| } |
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