| // Copyright 2016 Google Inc. All Rights Reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| // AUTO-GENERATED CODE. DO NOT EDIT. |
| |
| package pubsub |
| |
| import ( |
| "fmt" |
| "math" |
| "runtime" |
| "time" |
| |
| gax "github.com/googleapis/gax-go" |
| "golang.org/x/net/context" |
| "google.golang.org/api/option" |
| "google.golang.org/api/transport" |
| pubsubpb "google.golang.org/genproto/googleapis/pubsub/v1" |
| "google.golang.org/grpc" |
| "google.golang.org/grpc/codes" |
| "google.golang.org/grpc/metadata" |
| ) |
| |
| var ( |
| subscriberProjectPathTemplate = gax.MustCompilePathTemplate("projects/{project}") |
| subscriberSubscriptionPathTemplate = gax.MustCompilePathTemplate("projects/{project}/subscriptions/{subscription}") |
| subscriberTopicPathTemplate = gax.MustCompilePathTemplate("projects/{project}/topics/{topic}") |
| ) |
| |
| // SubscriberCallOptions contains the retry settings for each method of this client. |
| type SubscriberCallOptions struct { |
| CreateSubscription []gax.CallOption |
| GetSubscription []gax.CallOption |
| ListSubscriptions []gax.CallOption |
| DeleteSubscription []gax.CallOption |
| ModifyAckDeadline []gax.CallOption |
| Acknowledge []gax.CallOption |
| Pull []gax.CallOption |
| ModifyPushConfig []gax.CallOption |
| } |
| |
| func defaultSubscriberClientOptions() []option.ClientOption { |
| return []option.ClientOption{ |
| option.WithEndpoint("pubsub.googleapis.com:443"), |
| option.WithScopes( |
| "https://www.googleapis.com/auth/cloud-platform", |
| "https://www.googleapis.com/auth/pubsub", |
| ), |
| } |
| } |
| |
| func defaultSubscriberCallOptions() *SubscriberCallOptions { |
| retry := map[[2]string][]gax.CallOption{ |
| {"default", "idempotent"}: { |
| gax.WithRetry(func() gax.Retryer { |
| return gax.OnCodes([]codes.Code{ |
| codes.DeadlineExceeded, |
| codes.Unavailable, |
| }, gax.Backoff{ |
| Initial: 100 * time.Millisecond, |
| Max: 60000 * time.Millisecond, |
| Multiplier: 1.3, |
| }) |
| }), |
| }, |
| } |
| |
| return &SubscriberCallOptions{ |
| CreateSubscription: retry[[2]string{"default", "idempotent"}], |
| GetSubscription: retry[[2]string{"default", "idempotent"}], |
| ListSubscriptions: retry[[2]string{"default", "idempotent"}], |
| DeleteSubscription: retry[[2]string{"default", "idempotent"}], |
| ModifyAckDeadline: retry[[2]string{"default", "non_idempotent"}], |
| Acknowledge: retry[[2]string{"messaging", "non_idempotent"}], |
| Pull: retry[[2]string{"messaging", "non_idempotent"}], |
| ModifyPushConfig: retry[[2]string{"default", "non_idempotent"}], |
| } |
| } |
| |
| // SubscriberClient is a client for interacting with Subscriber. |
| type SubscriberClient struct { |
| // The connection to the service. |
| conn *grpc.ClientConn |
| |
| // The gRPC API client. |
| client pubsubpb.SubscriberClient |
| |
| // The call options for this service. |
| CallOptions *SubscriberCallOptions |
| |
| // The metadata to be sent with each request. |
| metadata map[string][]string |
| } |
| |
| // NewSubscriberClient creates a new subscriber service client. |
| // |
| // The service that an application uses to manipulate subscriptions and to |
| // consume messages from a subscription via the `Pull` method. |
| func NewSubscriberClient(ctx context.Context, opts ...option.ClientOption) (*SubscriberClient, error) { |
| conn, err := transport.DialGRPC(ctx, append(defaultSubscriberClientOptions(), opts...)...) |
| if err != nil { |
| return nil, err |
| } |
| c := &SubscriberClient{ |
| conn: conn, |
| client: pubsubpb.NewSubscriberClient(conn), |
| CallOptions: defaultSubscriberCallOptions(), |
| } |
| c.SetGoogleClientInfo("gax", gax.Version) |
| return c, nil |
| } |
| |
| // Connection returns the client's connection to the API service. |
| func (c *SubscriberClient) Connection() *grpc.ClientConn { |
| return c.conn |
| } |
| |
| // Close closes the connection to the API service. The user should invoke this when |
| // the client is no longer required. |
| func (c *SubscriberClient) Close() error { |
| return c.conn.Close() |
| } |
| |
| // SetGoogleClientInfo sets the name and version of the application in |
| // the `x-goog-api-client` header passed on each request. Intended for |
| // use by Google-written clients. |
| func (c *SubscriberClient) SetGoogleClientInfo(name, version string) { |
| c.metadata = map[string][]string{ |
| "x-goog-api-client": {fmt.Sprintf("%s/%s %s gax/%s go/%s", name, version, gapicNameVersion, gax.Version, runtime.Version())}, |
| } |
| } |
| |
| // ProjectPath returns the path for the project resource. |
| func SubscriberProjectPath(project string) string { |
| path, err := subscriberProjectPathTemplate.Render(map[string]string{ |
| "project": project, |
| }) |
| if err != nil { |
| panic(err) |
| } |
| return path |
| } |
| |
| // SubscriptionPath returns the path for the subscription resource. |
| func SubscriberSubscriptionPath(project string, subscription string) string { |
| path, err := subscriberSubscriptionPathTemplate.Render(map[string]string{ |
| "project": project, |
| "subscription": subscription, |
| }) |
| if err != nil { |
| panic(err) |
| } |
| return path |
| } |
| |
| // TopicPath returns the path for the topic resource. |
| func SubscriberTopicPath(project string, topic string) string { |
| path, err := subscriberTopicPathTemplate.Render(map[string]string{ |
| "project": project, |
| "topic": topic, |
| }) |
| if err != nil { |
| panic(err) |
| } |
| return path |
| } |
| |
| // CreateSubscription creates a subscription to a given topic for a given subscriber. |
| // If the subscription already exists, returns `ALREADY_EXISTS`. |
| // If the corresponding topic doesn't exist, returns `NOT_FOUND`. |
| // |
| // If the name is not provided in the request, the server will assign a random |
| // name for this subscription on the same project as the topic. |
| func (c *SubscriberClient) CreateSubscription(ctx context.Context, req *pubsubpb.Subscription) (*pubsubpb.Subscription, error) { |
| ctx = metadata.NewContext(ctx, c.metadata) |
| var resp *pubsubpb.Subscription |
| err := gax.Invoke(ctx, func(ctx context.Context) error { |
| var err error |
| resp, err = c.client.CreateSubscription(ctx, req) |
| return err |
| }, c.CallOptions.CreateSubscription...) |
| if err != nil { |
| return nil, err |
| } |
| return resp, nil |
| } |
| |
| // GetSubscription gets the configuration details of a subscription. |
| func (c *SubscriberClient) GetSubscription(ctx context.Context, req *pubsubpb.GetSubscriptionRequest) (*pubsubpb.Subscription, error) { |
| ctx = metadata.NewContext(ctx, c.metadata) |
| var resp *pubsubpb.Subscription |
| err := gax.Invoke(ctx, func(ctx context.Context) error { |
| var err error |
| resp, err = c.client.GetSubscription(ctx, req) |
| return err |
| }, c.CallOptions.GetSubscription...) |
| if err != nil { |
| return nil, err |
| } |
| return resp, nil |
| } |
| |
| // ListSubscriptions lists matching subscriptions. |
| func (c *SubscriberClient) ListSubscriptions(ctx context.Context, req *pubsubpb.ListSubscriptionsRequest) *SubscriptionIterator { |
| ctx = metadata.NewContext(ctx, c.metadata) |
| it := &SubscriptionIterator{} |
| it.apiCall = func() error { |
| var resp *pubsubpb.ListSubscriptionsResponse |
| err := gax.Invoke(ctx, func(ctx context.Context) error { |
| var err error |
| req.PageToken = it.nextPageToken |
| req.PageSize = it.pageSize |
| resp, err = c.client.ListSubscriptions(ctx, req) |
| return err |
| }, c.CallOptions.ListSubscriptions...) |
| if err != nil { |
| return err |
| } |
| if resp.NextPageToken == "" { |
| it.atLastPage = true |
| } |
| it.nextPageToken = resp.NextPageToken |
| it.items = resp.Subscriptions |
| return nil |
| } |
| return it |
| } |
| |
| // DeleteSubscription deletes an existing subscription. All pending messages in the subscription |
| // are immediately dropped. Calls to `Pull` after deletion will return |
| // `NOT_FOUND`. After a subscription is deleted, a new one may be created with |
| // the same name, but the new one has no association with the old |
| // subscription, or its topic unless the same topic is specified. |
| func (c *SubscriberClient) DeleteSubscription(ctx context.Context, req *pubsubpb.DeleteSubscriptionRequest) error { |
| ctx = metadata.NewContext(ctx, c.metadata) |
| err := gax.Invoke(ctx, func(ctx context.Context) error { |
| var err error |
| _, err = c.client.DeleteSubscription(ctx, req) |
| return err |
| }, c.CallOptions.DeleteSubscription...) |
| return err |
| } |
| |
| // ModifyAckDeadline modifies the ack deadline for a specific message. This method is useful |
| // to indicate that more time is needed to process a message by the |
| // subscriber, or to make the message available for redelivery if the |
| // processing was interrupted. |
| func (c *SubscriberClient) ModifyAckDeadline(ctx context.Context, req *pubsubpb.ModifyAckDeadlineRequest) error { |
| ctx = metadata.NewContext(ctx, c.metadata) |
| err := gax.Invoke(ctx, func(ctx context.Context) error { |
| var err error |
| _, err = c.client.ModifyAckDeadline(ctx, req) |
| return err |
| }, c.CallOptions.ModifyAckDeadline...) |
| return err |
| } |
| |
| // Acknowledge acknowledges the messages associated with the `ack_ids` in the |
| // `AcknowledgeRequest`. The Pub/Sub system can remove the relevant messages |
| // from the subscription. |
| // |
| // Acknowledging a message whose ack deadline has expired may succeed, |
| // but such a message may be redelivered later. Acknowledging a message more |
| // than once will not result in an error. |
| func (c *SubscriberClient) Acknowledge(ctx context.Context, req *pubsubpb.AcknowledgeRequest) error { |
| ctx = metadata.NewContext(ctx, c.metadata) |
| err := gax.Invoke(ctx, func(ctx context.Context) error { |
| var err error |
| _, err = c.client.Acknowledge(ctx, req) |
| return err |
| }, c.CallOptions.Acknowledge...) |
| return err |
| } |
| |
| // Pull pulls messages from the server. Returns an empty list if there are no |
| // messages available in the backlog. The server may return `UNAVAILABLE` if |
| // there are too many concurrent pull requests pending for the given |
| // subscription. |
| func (c *SubscriberClient) Pull(ctx context.Context, req *pubsubpb.PullRequest) (*pubsubpb.PullResponse, error) { |
| ctx = metadata.NewContext(ctx, c.metadata) |
| var resp *pubsubpb.PullResponse |
| err := gax.Invoke(ctx, func(ctx context.Context) error { |
| var err error |
| resp, err = c.client.Pull(ctx, req) |
| return err |
| }, c.CallOptions.Pull...) |
| if err != nil { |
| return nil, err |
| } |
| return resp, nil |
| } |
| |
| // ModifyPushConfig modifies the `PushConfig` for a specified subscription. |
| // |
| // This may be used to change a push subscription to a pull one (signified by |
| // an empty `PushConfig`) or vice versa, or change the endpoint URL and other |
| // attributes of a push subscription. Messages will accumulate for delivery |
| // continuously through the call regardless of changes to the `PushConfig`. |
| func (c *SubscriberClient) ModifyPushConfig(ctx context.Context, req *pubsubpb.ModifyPushConfigRequest) error { |
| ctx = metadata.NewContext(ctx, c.metadata) |
| err := gax.Invoke(ctx, func(ctx context.Context) error { |
| var err error |
| _, err = c.client.ModifyPushConfig(ctx, req) |
| return err |
| }, c.CallOptions.ModifyPushConfig...) |
| return err |
| } |
| |
| // SubscriptionIterator manages a stream of *pubsubpb.Subscription. |
| type SubscriptionIterator struct { |
| // The current page data. |
| items []*pubsubpb.Subscription |
| atLastPage bool |
| currentIndex int |
| pageSize int32 |
| nextPageToken string |
| apiCall func() error |
| } |
| |
| // NextPage returns the next page of results. |
| // It will return at most the number of results specified by the last call to SetPageSize. |
| // If SetPageSize was never called or was called with a value less than 1, |
| // the page size is determined by the underlying service. |
| // |
| // NextPage may return a second return value of Done along with the last page of results. After |
| // NextPage returns Done, all subsequent calls to NextPage will return (nil, Done). |
| // |
| // Next and NextPage should not be used with the same iterator. |
| func (it *SubscriptionIterator) NextPage() ([]*pubsubpb.Subscription, error) { |
| if it.atLastPage { |
| // We already returned Done with the last page of items. Continue to |
| // return Done, but with no items. |
| return nil, Done |
| } |
| if err := it.apiCall(); err != nil { |
| return nil, err |
| } |
| if it.atLastPage { |
| return it.items, Done |
| } |
| return it.items, nil |
| } |
| |
| // Next returns the next result. Its second return value is Done if there are no more results. |
| // Once next returns Done, all subsequent calls will return Done. |
| // |
| // Internally, Next retrieves results in bulk. You can call SetPageSize as a performance hint to |
| // affect how many results are retrieved in a single RPC. |
| // |
| // SetPageToken should not be called when using Next. |
| // |
| // Next and NextPage should not be used with the same iterator. |
| func (it *SubscriptionIterator) Next() (*pubsubpb.Subscription, error) { |
| for it.currentIndex >= len(it.items) { |
| if it.atLastPage { |
| return nil, Done |
| } |
| if err := it.apiCall(); err != nil { |
| return nil, err |
| } |
| it.currentIndex = 0 |
| } |
| result := it.items[it.currentIndex] |
| it.currentIndex++ |
| return result, nil |
| } |
| |
| // PageSize returns the page size for all subsequent calls to NextPage. |
| func (it *SubscriptionIterator) PageSize() int { |
| return int(it.pageSize) |
| } |
| |
| // SetPageSize sets the page size for all subsequent calls to NextPage. |
| func (it *SubscriptionIterator) SetPageSize(pageSize int) { |
| if pageSize > math.MaxInt32 { |
| pageSize = math.MaxInt32 |
| } |
| it.pageSize = int32(pageSize) |
| } |
| |
| // SetPageToken sets the page token for the next call to NextPage, to resume the iteration from |
| // a previous point. |
| func (it *SubscriptionIterator) SetPageToken(token string) { |
| it.nextPageToken = token |
| } |
| |
| // NextPageToken returns a page token that can be used with SetPageToken to resume |
| // iteration from the next page. It returns the empty string if there are no more pages. |
| func (it *SubscriptionIterator) NextPageToken() string { |
| return it.nextPageToken |
| } |