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// Package option contains options for Google API clients.
package option
import (
"net/http"
"golang.org/x/oauth2"
"google.golang.org/api/internal"
"google.golang.org/grpc"
)
// A ClientOption is an option for a Google API client.
type ClientOption interface {
Apply(*internal.DialSettings)
}
// WithTokenSource returns a ClientOption that specifies an OAuth2 token
// source to be used as the basis for authentication.
func WithTokenSource(s oauth2.TokenSource) ClientOption {
return withTokenSource{s}
}
type withTokenSource struct{ ts oauth2.TokenSource }
func (w withTokenSource) Apply(o *internal.DialSettings) {
o.TokenSource = w.ts
}
// WithEndpoint returns a ClientOption that overrides the default endpoint
// to be used for a service.
func WithEndpoint(url string) ClientOption {
return withEndpoint(url)
}
type withEndpoint string
func (w withEndpoint) Apply(o *internal.DialSettings) {
o.Endpoint = string(w)
}
// WithScopes returns a ClientOption that overrides the default OAuth2 scopes
// to be used for a service.
func WithScopes(scope ...string) ClientOption {
return withScopes(scope)
}
type withScopes []string
func (w withScopes) Apply(o *internal.DialSettings) {
s := make([]string, len(w))
copy(s, w)
o.Scopes = s
}
// WithUserAgent returns a ClientOption that sets the User-Agent.
func WithUserAgent(ua string) ClientOption {
return withUA(ua)
}
type withUA string
func (w withUA) Apply(o *internal.DialSettings) { o.UserAgent = string(w) }
// WithHTTPClient returns a ClientOption that specifies the HTTP client to use
// as the basis of communications. This option may only be used with services
// that support HTTP as their communication transport. When used, the
// WithHTTPClient option takes precedent over all other supplied options.
func WithHTTPClient(client *http.Client) ClientOption {
return withHTTPClient{client}
}
type withHTTPClient struct{ client *http.Client }
func (w withHTTPClient) Apply(o *internal.DialSettings) {
o.HTTPClient = w.client
}
// WithGRPCConn returns a ClientOption that specifies the gRPC client
// connection to use as the basis of communications. This option many only be
// used with services that support gRPC as their communication transport. When
// used, the WithGRPCConn option takes precedent over all other supplied
// options.
func WithGRPCConn(conn *grpc.ClientConn) ClientOption {
return withGRPCConn{conn}
}
type withGRPCConn struct{ conn *grpc.ClientConn }
func (w withGRPCConn) Apply(o *internal.DialSettings) {
o.GRPCConn = w.conn
}
// WithGRPCDialOption returns a ClientOption that appends a new grpc.DialOption
// to an underlying gRPC dial. It does not work with WithGRPCConn.
func WithGRPCDialOption(opt grpc.DialOption) ClientOption {
return withGRPCDialOption{opt}
}
type withGRPCDialOption struct{ opt grpc.DialOption }
func (w withGRPCDialOption) Apply(o *internal.DialSettings) {
o.GRPCDialOpts = append(o.GRPCDialOpts, w.opt)
}
// WithGRPCConnectionPool returns a ClientOption that creates a pool of gRPC
// connections that requests will be balanced between.
// This is an EXPERIMENTAL API and may be changed or removed in the future.
func WithGRPCConnectionPool(size int) ClientOption {
return withGRPCConnectionPool(size)
}
type withGRPCConnectionPool int
func (w withGRPCConnectionPool) Apply(o *internal.DialSettings) {
balancer := grpc.RoundRobin(internal.NewPoolResolver(int(w), o))
o.GRPCDialOpts = append(o.GRPCDialOpts, grpc.WithBalancer(balancer))
}
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