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service.go
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service.go
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package service
import (
"encoding/json"
"io"
"log"
"net/http"
"github.com/go-chi/chi"
"github.com/hyperboloide/pipe"
"github.com/hyperboloide/pipe/rw"
"github.com/segmentio/ksuid"
)
// Definition defines a URL enpoint and at lease a either a Writer,
// a Reader or a Deleter.
type Definition struct {
URL string `json:"url"`
WriterPipe json.RawMessage `json:"writer,omitempty"`
ReaderPipe json.RawMessage `json:"reader,omitempty"`
Deleter json.RawMessage `json:"deleter,omitempty"`
}
// Error display the service url and the encountred error.
func (d *Definition) Error(err error) {
log.Fatalf("service '%s' encountred an error: %s", d.URL, err)
}
// SetHandler set the right handler in chi for the provoded ServiceDefinition.
func SetHandler(r *chi.Mux, d Definition) {
r.Route("/"+d.URL, func(r chi.Router) {
if d.ReaderPipe != nil {
if ops, err := NewReadOperationsFromJSON(d.ReaderPipe); err != nil {
d.Error(err)
} else {
SetReadHandler(r, ops)
}
}
if d.WriterPipe != nil {
if ops, err := NewWriteOperationsFromJSON(d.WriterPipe); err != nil {
d.Error(err)
} else {
SetWriteHandler(r, ops)
}
}
if d.Deleter != nil {
if del, err := DeleterFromJSON(d.Deleter); err != nil {
d.Error(err)
} else {
SetDeleteHandler(r, del)
}
}
})
}
// SetReadHandler sets a chi handler for a Reader.
func SetReadHandler(r chi.Router, ops *ReadOperations) {
handler := func(w http.ResponseWriter, r *http.Request) {
id := chi.URLParam(r, "id")
if reader, err := ops.Input.NewReader(id); err != nil {
http.Error(w, http.StatusText(404), 404)
} else {
defer reader.Close()
p := pipe.New(reader)
if err := ops.SetPipe(p); err != nil {
http.Error(w, http.StatusText(500), 500)
}
p.To(w)
if err := p.Exec(); err != nil {
http.Error(w, http.StatusText(500), 500)
}
}
}
r.Get("/{id}", handler)
}
// SetDeleteHandler sets a chi handler for a Deleter.
func SetDeleteHandler(r chi.Router, del rw.Deleter) {
handler := func(w http.ResponseWriter, r *http.Request) {
id := chi.URLParam(r, "id")
if err := del.Delete(id); err != nil {
http.Error(w, http.StatusText(500), 500)
} else {
http.Error(w, http.StatusText(204), 204)
}
}
r.Delete("/{id}", handler)
}
// WriteResponse is returned as a json response on a sucessfull write.
type WriteResponse struct {
ID string `json:"id"`
BytesIn int64 `json:"bytes_in"`
BytesOut int64 `json:"bytes_out"`
}
// SetWriteHandler sets a chi router for a Writer.
func SetWriteHandler(r chi.Router, ops *WriteOperations) {
handler := func(id string, w http.ResponseWriter, r *http.Request) {
var reader io.Reader
if fr, _, err := r.FormFile("file"); err != nil {
defer r.Body.Close()
reader = r.Body
} else {
defer fr.Close()
reader = fr
}
p := pipe.New(reader)
if err := ops.SetPipe(p, id); err != nil {
http.Error(w, http.StatusText(500), 500)
} else if err := p.Exec(); err != nil {
http.Error(w, http.StatusText(500), 500)
} else {
data := &WriteResponse{id, p.TotalIn, p.TotalOut}
if res, err := json.Marshal(data); err != nil {
http.Error(w, http.StatusText(500), 500)
} else {
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(201)
if _, err = w.Write(res); err != nil {
http.Error(w, http.StatusText(500), 500)
}
}
}
}
generateID := func(w http.ResponseWriter, r *http.Request) {
id := ksuid.New().String()
handler(id, w, r)
}
extractID := func(w http.ResponseWriter, r *http.Request) {
id := chi.URLParam(r, "id")
handler(id, w, r)
}
r.Post("/", generateID)
r.Put("/", generateID)
r.Post("/{id}", extractID)
r.Put("/{id}", extractID)
}