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components.go
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components.go
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// Copyright 2023 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package sim
import (
"context"
"fmt"
"github.com/ServiceWeaver/weaver"
)
//go:generate ../cmd/weaver/weaver generate .
// This file contains components used to test the simulator in sim_test.go. The
// callgraph is intentionally overcomplicated to exercise the simulator.
// Component interfaces.
type divMod interface {
// DivMod(n, d) returns n/d, n%d.
DivMod(context.Context, int, int) (int, int, error)
}
type div interface {
// Div(n, d) returns n/d.
Div(context.Context, int, int) (int, error)
}
type mod interface {
// Mod(n, d) returns n%d.
Mod(context.Context, int, int) (int, error)
}
type identity interface {
// Identity(x) returns x.
Identity(context.Context, int) (int, error)
}
type blocker interface {
// Block blocks until the provided context is cancelled.
Block(context.Context) error
}
type panicker interface {
// Panic panics if the provided bool is true.
Panic(context.Context, bool) error
}
// Component implementation structs.
type divModImpl struct {
weaver.Implements[divMod]
div weaver.Ref[div]
mod weaver.Ref[mod]
}
type divImpl struct {
weaver.Implements[div]
identity weaver.Ref[identity]
}
type modImpl struct {
weaver.Implements[mod]
identity weaver.Ref[identity]
}
type identityImpl struct {
weaver.Implements[identity]
}
type blockerImpl struct {
weaver.Implements[blocker]
}
type panickerImpl struct {
weaver.Implements[panicker]
}
// Component implementations.
func (i *divModImpl) DivMod(ctx context.Context, n, d int) (int, int, error) {
div, err := i.div.Get().Div(ctx, n, d)
if err != nil {
return 0, 0, err
}
mod, err := i.mod.Get().Mod(ctx, n, d)
if err != nil {
return 0, 0, err
}
return div, mod, nil
}
func (i *divImpl) Div(ctx context.Context, n, d int) (int, error) {
if d == 0 {
return 0, zeroError{}
}
n, err := i.identity.Get().Identity(ctx, n)
if err != nil {
return 0, err
}
d, err = i.identity.Get().Identity(ctx, d)
if err != nil {
return 0, err
}
return n / d, nil
}
func (i *modImpl) Mod(ctx context.Context, n, d int) (int, error) {
if d == 0 {
return 0, zeroError{}
}
n, err := i.identity.Get().Identity(ctx, n)
if err != nil {
return 0, err
}
d, err = i.identity.Get().Identity(ctx, d)
if err != nil {
return 0, err
}
return n % d, nil
}
func (i *identityImpl) Identity(ctx context.Context, x int) (int, error) {
return x, nil
}
func (*blockerImpl) Block(ctx context.Context) error {
<-ctx.Done()
return ctx.Err()
}
func (*panickerImpl) Panic(_ context.Context, b bool) error {
if b {
panic(fmt.Errorf("Panic!"))
}
return nil
}
// Errors.
type zeroError struct {
weaver.AutoMarshal
}
func (zeroError) Error() string {
return "zero"
}