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getDevice.go
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getDevice.go
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package service
import (
"bytes"
"encoding/json"
"errors"
"io"
"net/http"
"net/http/httptest"
"github.com/google/go-querystring/query"
"github.com/gorilla/mux"
jsoniter "github.com/json-iterator/go"
"github.com/plgd-dev/hub/v2/http-gateway/serverMux"
"github.com/plgd-dev/hub/v2/http-gateway/uri"
kitNetGrpc "github.com/plgd-dev/hub/v2/pkg/net/grpc"
"google.golang.org/grpc/codes"
)
func toSimpleResponse(w http.ResponseWriter, rec *httptest.ResponseRecorder, writeError func(w http.ResponseWriter, err error), responseKeys ...string) {
iter := json.NewDecoder(bytes.NewReader(rec.Body.Bytes()))
datas := make([]interface{}, 0, 1)
for {
var v interface{}
err := iter.Decode(&v)
if errors.Is(err, io.EOF) {
break
}
if err != nil {
writeError(w, err)
return
}
datas = append(datas, v)
}
if len(datas) == 0 {
writeError(w, kitNetGrpc.ForwardErrorf(codes.NotFound, "not found"))
return
}
if len(datas) != 1 {
writeError(w, kitNetGrpc.ForwardErrorf(codes.InvalidArgument, "invalid number of responses"))
return
}
encoder := jsoniter.NewEncoder(w)
var result interface{}
result = datas[0]
for _, key := range responseKeys {
m, ok := result.(map[string]interface{})
if !ok {
break
}
tmp, ok := m[key]
if ok {
result = tmp
} else {
break
}
}
// copy everything from response recorder
// to actual response writer
for k, v := range rec.Header() {
w.Header()[k] = v
}
w.WriteHeader(rec.Code)
err := encoder.Encode(result)
if err != nil {
writeError(w, kitNetGrpc.ForwardErrorf(codes.Internal, "cannot encode response: %v", err))
}
}
func (requestHandler *RequestHandler) getDevice(w http.ResponseWriter, r *http.Request) {
vars := mux.Vars(r)
deviceID := vars[uri.DeviceIDKey]
type Options struct {
DeviceIDFilter []string `url:"deviceIdFilter"`
}
opt := Options{
DeviceIDFilter: []string{deviceID},
}
v, err := query.Values(opt)
if err != nil {
serverMux.WriteError(w, kitNetGrpc.ForwardErrorf(codes.InvalidArgument, "cannot get device('%v'): %v", deviceID, err))
return
}
r.URL.Path = uri.Devices
r.URL.RawQuery = v.Encode()
rec := httptest.NewRecorder()
requestHandler.mux.ServeHTTP(rec, r)
toSimpleResponse(w, rec, func(w http.ResponseWriter, err error) {
serverMux.WriteError(w, kitNetGrpc.ForwardErrorf(codes.InvalidArgument, "cannot get device('%v'): %v", deviceID, err))
}, streamResponseKey)
}