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command.go
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command.go
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package adapters
import (
"net/http"
"github.com/google/uuid"
"github.com/hay-kot/httpkit/errchain"
"github.com/hay-kot/httpkit/server"
)
type CommandFunc[T any] func(*http.Request) (T, error)
type CommandIDFunc[T any] func(*http.Request, uuid.UUID) (T, error)
// Command is an HandlerAdapter that returns a errchain.HandlerFunc that
// The command adapters are used to handle commands that do not accept a body
// or a query. You can think of them as a way to handle RPC style Rest Endpoints.
//
// Example:
//
// fn := func(r *http.Request) (interface{}, error) {
// // do something
// return nil, nil
// }
//
// r.Get("/foo", adapters.Command(fn, http.NoContent))
func Command[T any](f CommandFunc[T], ok int) errchain.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) error {
res, err := f(r)
if err != nil {
return err
}
return server.JSON(w, ok, res)
}
}
// CommandID is the same as the Command adapter but it accepts a UUID as a parameter
// in the URL. The parameter name is passed as the first argument.
//
// Example:
//
// fn := func(r *http.Request, id uuid.UUID) (interface{}, error) {
// // do something
// return nil, nil
// }
//
// r.Get("/foo/{id}", adapters.CommandID("id", fn, http.NoContent))
func CommandID[T any](param string, f CommandIDFunc[T], ok int) errchain.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) error {
ID, err := RouteUUID(r, param)
if err != nil {
return err
}
res, err := f(r, ID)
if err != nil {
return err
}
return server.JSON(w, ok, res)
}
}