// NewHTTPClient returns an HTTP client for use communicating with a Google cloud
// service, configured with the given ClientOptions. It also returns the endpoint
// for the service as specified in the options.
func NewHTTPClient(ctx context.Context, opts ...option.ClientOption) (*http.Client, string, error) {
var o internal.DialSettings
for _, opt := range opts {
opt.Apply(&o)
}
if o.GRPCConn != nil {
return nil, "", errors.New("unsupported gRPC connection specified")
}
// TODO(djd): Set UserAgent on all outgoing requests.
if o.HTTPClient != nil {
return o.HTTPClient, o.Endpoint, nil
}
if o.ServiceAccountJSONFilename != "" {
ts, err := serviceAcctTokenSource(ctx, o.ServiceAccountJSONFilename, o.Scopes...)
if err != nil {
return nil, "", err
}
o.TokenSource = ts
}
if o.TokenSource == nil {
var err error
o.TokenSource, err = google.DefaultTokenSource(ctx, o.Scopes...)
if err != nil {
return nil, "", fmt.Errorf("google.DefaultTokenSource: %v", err)
}
}
return oauth2.NewClient(ctx, o.TokenSource), o.Endpoint, nil
}
// DialGRPC returns a GRPC connection for use communicating with a Google cloud
// service, configured with the given ClientOptions.
func DialGRPC(ctx context.Context, opts ...option.ClientOption) (*grpc.ClientConn, error) {
var o internal.DialSettings
for _, opt := range opts {
opt.Apply(&o)
}
if o.HTTPClient != nil {
return nil, errors.New("unsupported HTTP client specified")
}
if o.GRPCConn != nil {
return o.GRPCConn, nil
}
if o.ServiceAccountJSONFilename != "" {
ts, err := serviceAcctTokenSource(ctx, o.ServiceAccountJSONFilename, o.Scopes...)
if err != nil {
return nil, err
}
o.TokenSource = ts
}
if o.TokenSource == nil {
var err error
o.TokenSource, err = google.DefaultTokenSource(ctx, o.Scopes...)
if err != nil {
return nil, fmt.Errorf("google.DefaultTokenSource: %v", err)
}
}
grpcOpts := []grpc.DialOption{
grpc.WithPerRPCCredentials(oauth.TokenSource{o.TokenSource}),
grpc.WithTransportCredentials(credentials.NewClientTLSFromCert(nil, "")),
}
if appengineDialerHook != nil {
// Use the Socket API on App Engine.
grpcOpts = append(grpcOpts, appengineDialerHook(ctx))
}
grpcOpts = append(grpcOpts, o.GRPCDialOpts...)
if o.UserAgent != "" {
grpcOpts = append(grpcOpts, grpc.WithUserAgent(o.UserAgent))
}
return grpc.DialContext(ctx, o.Endpoint, grpcOpts...)
}
func (w withHTTPClient) Apply(o *internal.DialSettings) {
o.HTTPClient = w.client
}
func (w withUA) Apply(o *internal.DialSettings) { o.UserAgent = string(w) }
func (w withScopes) Apply(o *internal.DialSettings) {
s := make([]string, len(w))
copy(s, w)
o.Scopes = s
}
func (w withEndpoint) Apply(o *internal.DialSettings) {
o.Endpoint = string(w)
}
func (w withServiceAccountFile) Apply(o *internal.DialSettings) {
o.ServiceAccountJSONFilename = string(w)
}
func (w withTokenSource) Apply(o *internal.DialSettings) {
o.TokenSource = w.ts
}
func (w withGRPCConnectionPool) Apply(o *internal.DialSettings) {
balancer := grpc.RoundRobin(internal.NewPoolResolver(int(w), o))
o.GRPCDialOpts = append(o.GRPCDialOpts, grpc.WithBalancer(balancer))
}
func (w withGRPCDialOption) Apply(o *internal.DialSettings) {
o.GRPCDialOpts = append(o.GRPCDialOpts, w.opt)
}
func (w withGRPCConn) Apply(o *internal.DialSettings) {
o.GRPCConn = w.conn
}
func (w withAPIKey) Apply(o *internal.DialSettings) { o.APIKey = string(w) }