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views.go
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views.go
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package frontend
import (
"encoding/json"
"errors"
"fmt"
"io"
"net/http"
"time"
"github.com/aukbit/pluto"
"github.com/aukbit/pluto/client"
pb "github.com/aukbit/pluto/examples/user/proto"
"github.com/aukbit/pluto/reply"
"github.com/aukbit/pluto/server/router"
"github.com/golang/protobuf/jsonpb"
"github.com/google/uuid"
"github.com/rs/zerolog/log"
)
var (
errClientUserNotAvailable = errors.New("Client user not available")
)
// PostHandler ...
func PostHandler(w http.ResponseWriter, r *http.Request) *router.Err {
// get context
ctx := r.Context()
// new user
nu := &pb.NewUser{}
if err := json.NewDecoder(r.Body).Decode(nu); err != nil {
return &router.Err{
Err: err,
Message: err.Error(),
Status: http.StatusInternalServerError,
}
}
defer r.Body.Close()
// get gRPC client from service
c, ok := pluto.FromContext(ctx).Client("user")
if !ok {
return &router.Err{
Err: errClientUserNotAvailable,
Message: errClientUserNotAvailable.Error(),
Status: http.StatusInternalServerError,
}
}
// dial
conn, err := c.Dial(client.Timeout(2 * time.Second))
if err != nil {
return &router.Err{
Err: err,
Message: err.Error(),
Status: http.StatusInternalServerError,
}
}
defer conn.Close()
// make call
user, err := c.Stub(conn).(pb.UserServiceClient).CreateUser(ctx, nu)
if err != nil {
return &router.Err{
Err: err,
Message: err.Error(),
Status: http.StatusInternalServerError,
}
}
log.Ctx(ctx).Info().Msg(fmt.Sprintf("POST user %s created", user.Id))
// set header location
w.Header().Set("Location", r.URL.Path+"/"+user.Id)
reply.Jsonpb(w, r, http.StatusCreated, &jsonpb.Marshaler{}, user)
return nil
}
// GetHandlerDetail ...
func GetHandlerDetail(w http.ResponseWriter, r *http.Request) *router.Err {
// get context
ctx := r.Context()
// get id context
id := router.FromContext(ctx, "id")
validID, err := uuid.Parse(id)
if err != nil {
return &router.Err{
Err: fmt.Errorf("Id %v not found", id),
Message: fmt.Errorf("Id %v not found", id).Error(),
Status: http.StatusNotFound,
}
}
// set proto user
user := &pb.User{Id: validID.String()}
// get gRPC client from service
c, ok := pluto.FromContext(ctx).Client("user")
if !ok {
return &router.Err{
Err: errClientUserNotAvailable,
Message: errClientUserNotAvailable.Error(),
Status: http.StatusInternalServerError,
}
}
// dial
conn, err := c.Dial()
if err != nil {
return &router.Err{
Err: err,
Message: err.Error(),
Status: http.StatusInternalServerError,
}
}
defer conn.Close()
// make a call the backend service
user, err = c.Stub(conn).(pb.UserServiceClient).ReadUser(ctx, user)
if err != nil {
return &router.Err{
Err: err,
Message: err.Error(),
Status: http.StatusInternalServerError,
}
}
log.Ctx(r.Context()).Info().Msg(fmt.Sprintf("GET user %s", user.Id))
// set header location
w.Header().Add("Location", r.URL.Path)
reply.Jsonpb(w, r, http.StatusOK, &jsonpb.Marshaler{}, user)
return nil
}
// PutHandler ...
func PutHandler(w http.ResponseWriter, r *http.Request) *router.Err {
// get context
ctx := r.Context()
// get id context
id := router.FromContext(ctx, "id")
validID, err := uuid.Parse(id)
if err != nil {
return &router.Err{
Err: fmt.Errorf("Id %v not found", id),
Status: http.StatusNotFound,
}
}
// set proto user
user := &pb.User{Id: validID.String()}
// unmarshal body
if err = jsonpb.Unmarshal(r.Body, user); err != nil {
return &router.Err{
Err: err,
Status: http.StatusInternalServerError,
}
}
// get gRPC client from service
c, ok := pluto.FromContext(ctx).Client("user")
if !ok {
return &router.Err{
Err: errClientUserNotAvailable,
Status: http.StatusInternalServerError,
}
}
// dial
conn, err := c.Dial()
if err != nil {
return &router.Err{
Err: err,
Status: http.StatusInternalServerError,
}
}
defer conn.Close()
// make a call the backend service
user, err = c.Stub(conn).(pb.UserServiceClient).UpdateUser(ctx, user)
if err != nil {
return &router.Err{
Err: err,
Status: http.StatusInternalServerError,
}
}
log.Ctx(r.Context()).Info().Msg(fmt.Sprintf("PUT user %s updated", user.Id))
// set header location
w.Header().Set("Location", r.URL.Path)
reply.Jsonpb(w, r, http.StatusOK, &jsonpb.Marshaler{}, user)
return nil
}
// DeleteHandler ...
func DeleteHandler(w http.ResponseWriter, r *http.Request) *router.Err {
// get context
ctx := r.Context()
// get id context
id := router.FromContext(ctx, "id")
validID, err := uuid.Parse(id)
if err != nil {
return &router.Err{
Err: fmt.Errorf("Id %v not found", id),
Message: fmt.Errorf("Id %v not found", id).Error(),
Status: http.StatusNotFound,
}
}
// set proto user
user := &pb.User{Id: validID.String()}
// get gRPC client from service
c, ok := pluto.FromContext(ctx).Client("user")
if !ok {
return &router.Err{
Err: errClientUserNotAvailable,
Message: errClientUserNotAvailable.Error(),
Status: http.StatusInternalServerError,
}
}
// dial
conn, err := c.Dial()
if err != nil {
return &router.Err{
Err: err,
Message: err.Error(),
Status: http.StatusInternalServerError,
}
}
defer conn.Close()
// make a call the backend service
user, err = c.Stub(conn).(pb.UserServiceClient).DeleteUser(ctx, user)
if err != nil {
return &router.Err{
Err: err,
Message: err.Error(),
Status: http.StatusInternalServerError,
}
}
log.Ctx(r.Context()).Info().Msg(fmt.Sprintf("DELETE user %s deleted", user.Id))
reply.Jsonpb(w, r, http.StatusOK, &jsonpb.Marshaler{}, user)
return nil
}
// GetHandler ...
func GetHandler(w http.ResponseWriter, r *http.Request) *router.Err {
// get context
ctx := r.Context()
// get parameters
n := r.URL.Query().Get("name")
// set proto filter
filter := &pb.Filter{Name: n}
// get gRPC client from service
c, ok := pluto.FromContext(ctx).Client("user")
if !ok {
return &router.Err{
Err: errClientUserNotAvailable,
Message: errClientUserNotAvailable.Error(),
Status: http.StatusInternalServerError,
}
}
// dial
conn, err := c.Dial()
if err != nil {
return &router.Err{
Err: err,
Message: err.Error(),
Status: http.StatusInternalServerError,
}
}
defer conn.Close()
// make a call the backend service
users, err := c.Stub(conn).(pb.UserServiceClient).FilterUsers(ctx, filter)
if err != nil {
return &router.Err{
Err: err,
Message: err.Error(),
Status: http.StatusInternalServerError,
}
}
log.Ctx(r.Context()).Info().Msg(fmt.Sprintf("GET users %v", users))
reply.Jsonpb(w, r, http.StatusOK, &jsonpb.Marshaler{}, users)
return nil
}
// GetStreamHandler ...
func GetStreamHandler(w http.ResponseWriter, r *http.Request) *router.Err {
// get context
ctx := r.Context()
// get parameters
n := r.URL.Query().Get("name")
// set proto filter
filter := &pb.Filter{Name: n}
// get gRPC client from service
c, ok := pluto.FromContext(ctx).Client("user")
if !ok {
return &router.Err{
Err: errClientUserNotAvailable,
Message: errClientUserNotAvailable.Error(),
Status: http.StatusInternalServerError,
}
}
// dial
conn, err := c.Dial()
if err != nil {
return &router.Err{
Err: err,
Message: err.Error(),
Status: http.StatusInternalServerError,
}
}
defer conn.Close()
// make call
stream, err := c.Stub(conn).(pb.UserServiceClient).StreamUsers(ctx, filter)
if err != nil {
return &router.Err{
Err: err,
Message: err.Error(),
Status: http.StatusInternalServerError,
}
}
users := &pb.Users{}
for {
u, err := stream.Recv()
if err == io.EOF {
break
}
if err != nil {
return &router.Err{
Err: fmt.Errorf("%v.StreamUsers(_) = _, %v", c.Stub(conn), err),
Message: fmt.Errorf("%v.StreamUsers(_) = _, %v", c.Stub(conn), err).Error(),
Status: http.StatusInternalServerError,
}
}
users.Data = append(users.Data, u)
}
log.Ctx(r.Context()).Info().Msg(fmt.Sprintf("GET Stream users %v", users))
reply.Jsonpb(w, r, http.StatusOK, &jsonpb.Marshaler{}, users)
return nil
}