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// Copyright 2011 Google Inc. All rights reserved.
// Use of this source code is governed by the Apache 2.0
// license that can be found in the LICENSE file.
/*
Package capability exposes information about outages and scheduled downtime
for specific API capabilities.
This package does not work in App Engine "flexible environment".
Example:
if !capability.Enabled(c, "datastore_v3", "write") {
// show user a different page
}
*/
package capability // import "google.golang.org/appengine/capability"
import (
"golang.org/x/net/context"
"google.golang.org/appengine/internal"
"google.golang.org/appengine/log"
pb "google.golang.org/appengine/internal/capability"
)
// Enabled returns whether an API's capabilities are enabled.
// The wildcard "*" capability matches every capability of an API.
// If the underlying RPC fails (if the package is unknown, for example),
// false is returned and information is written to the application log.
func Enabled(ctx context.Context, api, capability string) bool {
req := &pb.IsEnabledRequest{
Package: &api,
Capability: []string{capability},
}
res := &pb.IsEnabledResponse{}
if err := internal.Call(ctx, "capability_service", "IsEnabled", req, res); err != nil {
log.Warningf(ctx, "capability.Enabled: RPC failed: %v", err)
return false
}
switch *res.SummaryStatus {
case pb.IsEnabledResponse_ENABLED,
pb.IsEnabledResponse_SCHEDULED_FUTURE,
pb.IsEnabledResponse_SCHEDULED_NOW:
return true
case pb.IsEnabledResponse_UNKNOWN:
log.Errorf(ctx, "capability.Enabled: unknown API capability %s/%s", api, capability)
return false
default:
return false
}
}
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