// NewRemoteContext returns a context that gives access to the production
// APIs for the application at the given host. All communication will be
// performed over SSL unless the host is localhost.
func NewRemoteContext(host string, client *http.Client) (context.Context, error) {
// Add an appcfg header to outgoing requests.
t := client.Transport
if t == nil {
t = http.DefaultTransport
}
client.Transport = &headerAddingRoundTripper{t}
url := url.URL{
Scheme: "https",
Host: host,
Path: "/_ah/remote_api",
}
if host == "localhost" || strings.HasPrefix(host, "localhost:") {
url.Scheme = "http"
}
u := url.String()
appID, err := getAppID(client, u)
if err != nil {
return nil, fmt.Errorf("unable to contact server: %v", err)
}
rc := &remoteContext{
client: client,
url: u,
}
ctx := internal.WithCallOverride(context.Background(), rc.call)
ctx = internal.WithLogOverride(ctx, rc.logf)
ctx = internal.WithAppIDOverride(ctx, appID)
return ctx, nil
}
// FakeSingleContext returns a context whose Call invocations will be serviced
// by f, which should be a function that has two arguments of the input and output
// protocol buffer type, and one error return.
func FakeSingleContext(t *testing.T, service, method string, f interface{}) context.Context {
fv := reflect.ValueOf(f)
if fv.Kind() != reflect.Func {
t.Fatal("not a function")
}
ft := fv.Type()
if ft.NumIn() != 2 || ft.NumOut() != 1 {
t.Fatalf("f has %d in and %d out, want 2 in and 1 out", ft.NumIn(), ft.NumOut())
}
for i := 0; i < 2; i++ {
at := ft.In(i)
if !at.Implements(protoMessageType) {
t.Fatalf("arg %d does not implement proto.Message", i)
}
}
if ft.Out(0) != errorType {
t.Fatalf("f's return is %v, want error", ft.Out(0))
}
s := &single{
t: t,
service: service,
method: method,
f: fv,
}
return internal.WithCallOverride(context.Background(), s.call)
}
// WithCallOverride returns a copy of the parent context
// that will cause API calls to invoke f instead of their normal operation.
//
// This is intended for advanced users only.
func WithAPICallFunc(ctx context.Context, f APICallFunc) context.Context {
return internal.WithCallOverride(ctx, internal.CallOverrideFunc(f))
}