/
runner.go
93 lines (80 loc) · 2.46 KB
/
runner.go
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package usecasex
import "context"
type Ctx interface {
Context() context.Context
SetContext(ctx context.Context)
}
type Handler func(ctx context.Context) error
type Handler1[A any] func(ctx context.Context) (A, error)
type Handler2[A, B any] func(ctx context.Context) (A, B, error)
type Handler3[A, B, C any] func(ctx context.Context) (A, B, C, error)
type MiddlewareHandler func(ctx context.Context) (context.Context, error)
type Middleware func(next MiddlewareHandler) MiddlewareHandler
func Run(ctx context.Context, h Handler, m ...Middleware) (err error) {
_, err = ApplyMiddleware(func(ctx context.Context) (context.Context, error) {
return ctx, h(ctx)
}, m...)(ctx)
return
}
func Run1[A any](ctx context.Context, h Handler1[A], m ...Middleware) (a A, err error) {
_, err = ApplyMiddleware(func(ctx context.Context) (context.Context, error) {
a2, err := h(ctx)
a = a2
return ctx, err
}, m...)(ctx)
return
}
func Run2[A, B any](ctx context.Context, h Handler2[A, B], m ...Middleware) (a A, b B, err error) {
_, err = ApplyMiddleware(func(ctx context.Context) (context.Context, error) {
a2, b2, err := h(ctx)
a = a2
b = b2
return ctx, err
}, m...)(ctx)
return
}
func Run3[A, B, C any](ctx context.Context, h Handler3[A, B, C], m ...Middleware) (a A, b B, c C, err error) {
_, err = ApplyMiddleware(func(ctx context.Context) (context.Context, error) {
a2, b2, c2, err := h(ctx)
a = a2
b = b2
c = c2
return ctx, err
}, m...)(ctx)
return
}
func ComposeMiddleware(m ...Middleware) Middleware {
return func(next MiddlewareHandler) MiddlewareHandler {
return ApplyMiddleware(next, m...)
}
}
func ApplyMiddleware(h MiddlewareHandler, middleware ...Middleware) MiddlewareHandler {
for i := len(middleware) - 1; i >= 0; i-- {
h = middleware[i](h)
}
return h
}
func UpdateContext(f func(ctx context.Context) context.Context) Middleware {
return func(next MiddlewareHandler) MiddlewareHandler {
return func(ctx context.Context) (context.Context, error) {
return next(f(ctx))
}
}
}
type TxUsecase struct {
Transaction Transaction
}
func (t TxUsecase) UseTx() Middleware {
return t.UseTxWithRetries(0)
}
func (t TxUsecase) UseTxWithRetries(retry int) Middleware {
return func(next MiddlewareHandler) MiddlewareHandler {
return func(ctx context.Context) (ctx2 context.Context, err error) {
err = DoTransaction(ctx, t.Transaction, retry, func(ctx context.Context) (err2 error) {
ctx2, err2 = next(ctx)
return err2
})
return
}
}
}