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// Copyright 2020 Google LLC
//
// 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
//
// https://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.
// Code generated by protoc-gen-go_gapic. DO NOT EDIT.
package memcache
import (
"context"
"fmt"
"math"
"net/url"
"time"
"cloud.google.com/go/longrunning"
lroauto "cloud.google.com/go/longrunning/autogen"
"github.com/golang/protobuf/proto"
gax "github.com/googleapis/gax-go/v2"
"google.golang.org/api/iterator"
"google.golang.org/api/option"
gtransport "google.golang.org/api/transport/grpc"
memcachepb "google.golang.org/genproto/googleapis/cloud/memcache/v1beta2"
longrunningpb "google.golang.org/genproto/googleapis/longrunning"
"google.golang.org/grpc"
"google.golang.org/grpc/metadata"
)
// CloudMemcacheCallOptions contains the retry settings for each method of CloudMemcacheClient.
type CloudMemcacheCallOptions struct {
ListInstances []gax.CallOption
GetInstance []gax.CallOption
CreateInstance []gax.CallOption
UpdateInstance []gax.CallOption
UpdateParameters []gax.CallOption
DeleteInstance []gax.CallOption
ApplyParameters []gax.CallOption
}
func defaultCloudMemcacheClientOptions() []option.ClientOption {
return []option.ClientOption{
option.WithEndpoint("memcache.googleapis.com:443"),
option.WithGRPCDialOption(grpc.WithDisableServiceConfig()),
option.WithScopes(DefaultAuthScopes()...),
option.WithGRPCDialOption(grpc.WithDefaultCallOptions(
grpc.MaxCallRecvMsgSize(math.MaxInt32))),
}
}
func defaultCloudMemcacheCallOptions() *CloudMemcacheCallOptions {
return &CloudMemcacheCallOptions{
ListInstances: []gax.CallOption{},
GetInstance: []gax.CallOption{},
CreateInstance: []gax.CallOption{},
UpdateInstance: []gax.CallOption{},
UpdateParameters: []gax.CallOption{},
DeleteInstance: []gax.CallOption{},
ApplyParameters: []gax.CallOption{},
}
}
// CloudMemcacheClient is a client for interacting with Cloud Memorystore for Memcached API.
//
// Methods, except Close, may be called concurrently. However, fields must not be modified concurrently with method calls.
type CloudMemcacheClient struct {
// Connection pool of gRPC connections to the service.
connPool gtransport.ConnPool
// The gRPC API client.
cloudMemcacheClient memcachepb.CloudMemcacheClient
// LROClient is used internally to handle longrunning operations.
// It is exposed so that its CallOptions can be modified if required.
// Users should not Close this client.
LROClient *lroauto.OperationsClient
// The call options for this service.
CallOptions *CloudMemcacheCallOptions
// The x-goog-* metadata to be sent with each request.
xGoogMetadata metadata.MD
}
// NewCloudMemcacheClient creates a new cloud memcache client.
//
// Configures and manages Cloud Memorystore for Memcached instances.
//
// The memcache.googleapis.com service implements the Google Cloud Memorystore
// for Memcached API and defines the following resource model for managing
// Memorystore Memcached (also called Memcached below) instances:
//
// The service works with a collection of cloud projects, named: /projects/*
//
// Each project has a collection of available locations, named: /locations/*
//
// Each location has a collection of Memcached instances, named:
// /instances/*
//
// As such, Memcached instances are resources of the form:
// /projects/{project_id}/locations/{location_id}/instances/{instance_id}
//
// Note that location_id must be refering to a GCP region; for example:
//
// projects/my-memcached-project/locations/us-central1/instances/my-memcached
func NewCloudMemcacheClient(ctx context.Context, opts ...option.ClientOption) (*CloudMemcacheClient, error) {
connPool, err := gtransport.DialPool(ctx, append(defaultCloudMemcacheClientOptions(), opts...)...)
if err != nil {
return nil, err
}
c := &CloudMemcacheClient{
connPool: connPool,
CallOptions: defaultCloudMemcacheCallOptions(),
cloudMemcacheClient: memcachepb.NewCloudMemcacheClient(connPool),
}
c.setGoogleClientInfo()
c.LROClient, err = lroauto.NewOperationsClient(ctx, gtransport.WithConnPool(connPool))
if err != nil {
// This error "should not happen", since we are just reusing old connection pool
// and never actually need to dial.
// If this does happen, we could leak connp. However, we cannot close conn:
// If the user invoked the constructor with option.WithGRPCConn,
// we would close a connection that's still in use.
// TODO: investigate error conditions.
return nil, err
}
return c, nil
}
// Connection returns a connection to the API service.
//
// Deprecated.
func (c *CloudMemcacheClient) Connection() *grpc.ClientConn {
return c.connPool.Conn()
}
// Close closes the connection to the API service. The user should invoke this when
// the client is no longer required.
func (c *CloudMemcacheClient) Close() error {
return c.connPool.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 *CloudMemcacheClient) setGoogleClientInfo(keyval ...string) {
kv := append([]string{"gl-go", versionGo()}, keyval...)
kv = append(kv, "gapic", versionClient, "gax", gax.Version, "grpc", grpc.Version)
c.xGoogMetadata = metadata.Pairs("x-goog-api-client", gax.XGoogHeader(kv...))
}
// ListInstances lists Instances in a given project and location.
func (c *CloudMemcacheClient) ListInstances(ctx context.Context, req *memcachepb.ListInstancesRequest, opts ...gax.CallOption) *InstanceIterator {
md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent())))
ctx = insertMetadata(ctx, c.xGoogMetadata, md)
opts = append(c.CallOptions.ListInstances[0:len(c.CallOptions.ListInstances):len(c.CallOptions.ListInstances)], opts...)
it := &InstanceIterator{}
req = proto.Clone(req).(*memcachepb.ListInstancesRequest)
it.InternalFetch = func(pageSize int, pageToken string) ([]*memcachepb.Instance, string, error) {
var resp *memcachepb.ListInstancesResponse
req.PageToken = pageToken
if pageSize > math.MaxInt32 {
req.PageSize = math.MaxInt32
} else {
req.PageSize = int32(pageSize)
}
err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
var err error
resp, err = c.cloudMemcacheClient.ListInstances(ctx, req, settings.GRPC...)
return err
}, opts...)
if err != nil {
return nil, "", err
}
it.Response = resp
return resp.Resources, resp.NextPageToken, nil
}
fetch := func(pageSize int, pageToken string) (string, error) {
items, nextPageToken, err := it.InternalFetch(pageSize, pageToken)
if err != nil {
return "", err
}
it.items = append(it.items, items...)
return nextPageToken, nil
}
it.pageInfo, it.nextFunc = iterator.NewPageInfo(fetch, it.bufLen, it.takeBuf)
it.pageInfo.MaxSize = int(req.PageSize)
it.pageInfo.Token = req.PageToken
return it
}
// GetInstance gets details of a single Instance.
func (c *CloudMemcacheClient) GetInstance(ctx context.Context, req *memcachepb.GetInstanceRequest, opts ...gax.CallOption) (*memcachepb.Instance, error) {
md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName())))
ctx = insertMetadata(ctx, c.xGoogMetadata, md)
opts = append(c.CallOptions.GetInstance[0:len(c.CallOptions.GetInstance):len(c.CallOptions.GetInstance)], opts...)
var resp *memcachepb.Instance
err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
var err error
resp, err = c.cloudMemcacheClient.GetInstance(ctx, req, settings.GRPC...)
return err
}, opts...)
if err != nil {
return nil, err
}
return resp, nil
}
// CreateInstance creates a new Instance in a given project and location.
func (c *CloudMemcacheClient) CreateInstance(ctx context.Context, req *memcachepb.CreateInstanceRequest, opts ...gax.CallOption) (*CreateInstanceOperation, error) {
md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent())))
ctx = insertMetadata(ctx, c.xGoogMetadata, md)
opts = append(c.CallOptions.CreateInstance[0:len(c.CallOptions.CreateInstance):len(c.CallOptions.CreateInstance)], opts...)
var resp *longrunningpb.Operation
err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
var err error
resp, err = c.cloudMemcacheClient.CreateInstance(ctx, req, settings.GRPC...)
return err
}, opts...)
if err != nil {
return nil, err
}
return &CreateInstanceOperation{
lro: longrunning.InternalNewOperation(c.LROClient, resp),
}, nil
}
// UpdateInstance updates an existing Instance in a given project and location.
func (c *CloudMemcacheClient) UpdateInstance(ctx context.Context, req *memcachepb.UpdateInstanceRequest, opts ...gax.CallOption) (*UpdateInstanceOperation, error) {
md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "resource.name", url.QueryEscape(req.GetResource().GetName())))
ctx = insertMetadata(ctx, c.xGoogMetadata, md)
opts = append(c.CallOptions.UpdateInstance[0:len(c.CallOptions.UpdateInstance):len(c.CallOptions.UpdateInstance)], opts...)
var resp *longrunningpb.Operation
err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
var err error
resp, err = c.cloudMemcacheClient.UpdateInstance(ctx, req, settings.GRPC...)
return err
}, opts...)
if err != nil {
return nil, err
}
return &UpdateInstanceOperation{
lro: longrunning.InternalNewOperation(c.LROClient, resp),
}, nil
}
// UpdateParameters updates the defined Memcached Parameters for an existing Instance.
// This method only stages the parameters, it must be followed by
// ApplyParameters to apply the parameters to nodes of the Memcached Instance.
func (c *CloudMemcacheClient) UpdateParameters(ctx context.Context, req *memcachepb.UpdateParametersRequest, opts ...gax.CallOption) (*UpdateParametersOperation, error) {
md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName())))
ctx = insertMetadata(ctx, c.xGoogMetadata, md)
opts = append(c.CallOptions.UpdateParameters[0:len(c.CallOptions.UpdateParameters):len(c.CallOptions.UpdateParameters)], opts...)
var resp *longrunningpb.Operation
err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
var err error
resp, err = c.cloudMemcacheClient.UpdateParameters(ctx, req, settings.GRPC...)
return err
}, opts...)
if err != nil {
return nil, err
}
return &UpdateParametersOperation{
lro: longrunning.InternalNewOperation(c.LROClient, resp),
}, nil
}
// DeleteInstance deletes a single Instance.
func (c *CloudMemcacheClient) DeleteInstance(ctx context.Context, req *memcachepb.DeleteInstanceRequest, opts ...gax.CallOption) (*DeleteInstanceOperation, error) {
md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName())))
ctx = insertMetadata(ctx, c.xGoogMetadata, md)
opts = append(c.CallOptions.DeleteInstance[0:len(c.CallOptions.DeleteInstance):len(c.CallOptions.DeleteInstance)], opts...)
var resp *longrunningpb.Operation
err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
var err error
resp, err = c.cloudMemcacheClient.DeleteInstance(ctx, req, settings.GRPC...)
return err
}, opts...)
if err != nil {
return nil, err
}
return &DeleteInstanceOperation{
lro: longrunning.InternalNewOperation(c.LROClient, resp),
}, nil
}
// ApplyParameters applyParameters will update current set of Parameters to the set of
// specified nodes of the Memcached Instance.
func (c *CloudMemcacheClient) ApplyParameters(ctx context.Context, req *memcachepb.ApplyParametersRequest, opts ...gax.CallOption) (*ApplyParametersOperation, error) {
md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName())))
ctx = insertMetadata(ctx, c.xGoogMetadata, md)
opts = append(c.CallOptions.ApplyParameters[0:len(c.CallOptions.ApplyParameters):len(c.CallOptions.ApplyParameters)], opts...)
var resp *longrunningpb.Operation
err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
var err error
resp, err = c.cloudMemcacheClient.ApplyParameters(ctx, req, settings.GRPC...)
return err
}, opts...)
if err != nil {
return nil, err
}
return &ApplyParametersOperation{
lro: longrunning.InternalNewOperation(c.LROClient, resp),
}, nil
}
// ApplyParametersOperation manages a long-running operation from ApplyParameters.
type ApplyParametersOperation struct {
lro *longrunning.Operation
}
// ApplyParametersOperation returns a new ApplyParametersOperation from a given name.
// The name must be that of a previously created ApplyParametersOperation, possibly from a different process.
func (c *CloudMemcacheClient) ApplyParametersOperation(name string) *ApplyParametersOperation {
return &ApplyParametersOperation{
lro: longrunning.InternalNewOperation(c.LROClient, &longrunningpb.Operation{Name: name}),
}
}
// Wait blocks until the long-running operation is completed, returning the response and any errors encountered.
//
// See documentation of Poll for error-handling information.
func (op *ApplyParametersOperation) Wait(ctx context.Context, opts ...gax.CallOption) (*memcachepb.Instance, error) {
var resp memcachepb.Instance
if err := op.lro.WaitWithInterval(ctx, &resp, time.Minute, opts...); err != nil {
return nil, err
}
return &resp, nil
}
// Poll fetches the latest state of the long-running operation.
//
// Poll also fetches the latest metadata, which can be retrieved by Metadata.
//
// If Poll fails, the error is returned and op is unmodified. If Poll succeeds and
// the operation has completed with failure, the error is returned and op.Done will return true.
// If Poll succeeds and the operation has completed successfully,
// op.Done will return true, and the response of the operation is returned.
// If Poll succeeds and the operation has not completed, the returned response and error are both nil.
func (op *ApplyParametersOperation) Poll(ctx context.Context, opts ...gax.CallOption) (*memcachepb.Instance, error) {
var resp memcachepb.Instance
if err := op.lro.Poll(ctx, &resp, opts...); err != nil {
return nil, err
}
if !op.Done() {
return nil, nil
}
return &resp, nil
}
// Metadata returns metadata associated with the long-running operation.
// Metadata itself does not contact the server, but Poll does.
// To get the latest metadata, call this method after a successful call to Poll.
// If the metadata is not available, the returned metadata and error are both nil.
func (op *ApplyParametersOperation) Metadata() (*memcachepb.OperationMetadata, error) {
var meta memcachepb.OperationMetadata
if err := op.lro.Metadata(&meta); err == longrunning.ErrNoMetadata {
return nil, nil
} else if err != nil {
return nil, err
}
return &meta, nil
}
// Done reports whether the long-running operation has completed.
func (op *ApplyParametersOperation) Done() bool {
return op.lro.Done()
}
// Name returns the name of the long-running operation.
// The name is assigned by the server and is unique within the service from which the operation is created.
func (op *ApplyParametersOperation) Name() string {
return op.lro.Name()
}
// CreateInstanceOperation manages a long-running operation from CreateInstance.
type CreateInstanceOperation struct {
lro *longrunning.Operation
}
// CreateInstanceOperation returns a new CreateInstanceOperation from a given name.
// The name must be that of a previously created CreateInstanceOperation, possibly from a different process.
func (c *CloudMemcacheClient) CreateInstanceOperation(name string) *CreateInstanceOperation {
return &CreateInstanceOperation{
lro: longrunning.InternalNewOperation(c.LROClient, &longrunningpb.Operation{Name: name}),
}
}
// Wait blocks until the long-running operation is completed, returning the response and any errors encountered.
//
// See documentation of Poll for error-handling information.
func (op *CreateInstanceOperation) Wait(ctx context.Context, opts ...gax.CallOption) (*memcachepb.Instance, error) {
var resp memcachepb.Instance
if err := op.lro.WaitWithInterval(ctx, &resp, time.Minute, opts...); err != nil {
return nil, err
}
return &resp, nil
}
// Poll fetches the latest state of the long-running operation.
//
// Poll also fetches the latest metadata, which can be retrieved by Metadata.
//
// If Poll fails, the error is returned and op is unmodified. If Poll succeeds and
// the operation has completed with failure, the error is returned and op.Done will return true.
// If Poll succeeds and the operation has completed successfully,
// op.Done will return true, and the response of the operation is returned.
// If Poll succeeds and the operation has not completed, the returned response and error are both nil.
func (op *CreateInstanceOperation) Poll(ctx context.Context, opts ...gax.CallOption) (*memcachepb.Instance, error) {
var resp memcachepb.Instance
if err := op.lro.Poll(ctx, &resp, opts...); err != nil {
return nil, err
}
if !op.Done() {
return nil, nil
}
return &resp, nil
}
// Metadata returns metadata associated with the long-running operation.
// Metadata itself does not contact the server, but Poll does.
// To get the latest metadata, call this method after a successful call to Poll.
// If the metadata is not available, the returned metadata and error are both nil.
func (op *CreateInstanceOperation) Metadata() (*memcachepb.OperationMetadata, error) {
var meta memcachepb.OperationMetadata
if err := op.lro.Metadata(&meta); err == longrunning.ErrNoMetadata {
return nil, nil
} else if err != nil {
return nil, err
}
return &meta, nil
}
// Done reports whether the long-running operation has completed.
func (op *CreateInstanceOperation) Done() bool {
return op.lro.Done()
}
// Name returns the name of the long-running operation.
// The name is assigned by the server and is unique within the service from which the operation is created.
func (op *CreateInstanceOperation) Name() string {
return op.lro.Name()
}
// DeleteInstanceOperation manages a long-running operation from DeleteInstance.
type DeleteInstanceOperation struct {
lro *longrunning.Operation
}
// DeleteInstanceOperation returns a new DeleteInstanceOperation from a given name.
// The name must be that of a previously created DeleteInstanceOperation, possibly from a different process.
func (c *CloudMemcacheClient) DeleteInstanceOperation(name string) *DeleteInstanceOperation {
return &DeleteInstanceOperation{
lro: longrunning.InternalNewOperation(c.LROClient, &longrunningpb.Operation{Name: name}),
}
}
// Wait blocks until the long-running operation is completed, returning the response and any errors encountered.
//
// See documentation of Poll for error-handling information.
func (op *DeleteInstanceOperation) Wait(ctx context.Context, opts ...gax.CallOption) error {
return op.lro.WaitWithInterval(ctx, nil, time.Minute, opts...)
}
// Poll fetches the latest state of the long-running operation.
//
// Poll also fetches the latest metadata, which can be retrieved by Metadata.
//
// If Poll fails, the error is returned and op is unmodified. If Poll succeeds and
// the operation has completed with failure, the error is returned and op.Done will return true.
// If Poll succeeds and the operation has completed successfully,
// op.Done will return true, and the response of the operation is returned.
// If Poll succeeds and the operation has not completed, the returned response and error are both nil.
func (op *DeleteInstanceOperation) Poll(ctx context.Context, opts ...gax.CallOption) error {
return op.lro.Poll(ctx, nil, opts...)
}
// Metadata returns metadata associated with the long-running operation.
// Metadata itself does not contact the server, but Poll does.
// To get the latest metadata, call this method after a successful call to Poll.
// If the metadata is not available, the returned metadata and error are both nil.
func (op *DeleteInstanceOperation) Metadata() (*memcachepb.OperationMetadata, error) {
var meta memcachepb.OperationMetadata
if err := op.lro.Metadata(&meta); err == longrunning.ErrNoMetadata {
return nil, nil
} else if err != nil {
return nil, err
}
return &meta, nil
}
// Done reports whether the long-running operation has completed.
func (op *DeleteInstanceOperation) Done() bool {
return op.lro.Done()
}
// Name returns the name of the long-running operation.
// The name is assigned by the server and is unique within the service from which the operation is created.
func (op *DeleteInstanceOperation) Name() string {
return op.lro.Name()
}
// UpdateInstanceOperation manages a long-running operation from UpdateInstance.
type UpdateInstanceOperation struct {
lro *longrunning.Operation
}
// UpdateInstanceOperation returns a new UpdateInstanceOperation from a given name.
// The name must be that of a previously created UpdateInstanceOperation, possibly from a different process.
func (c *CloudMemcacheClient) UpdateInstanceOperation(name string) *UpdateInstanceOperation {
return &UpdateInstanceOperation{
lro: longrunning.InternalNewOperation(c.LROClient, &longrunningpb.Operation{Name: name}),
}
}
// Wait blocks until the long-running operation is completed, returning the response and any errors encountered.
//
// See documentation of Poll for error-handling information.
func (op *UpdateInstanceOperation) Wait(ctx context.Context, opts ...gax.CallOption) (*memcachepb.Instance, error) {
var resp memcachepb.Instance
if err := op.lro.WaitWithInterval(ctx, &resp, time.Minute, opts...); err != nil {
return nil, err
}
return &resp, nil
}
// Poll fetches the latest state of the long-running operation.
//
// Poll also fetches the latest metadata, which can be retrieved by Metadata.
//
// If Poll fails, the error is returned and op is unmodified. If Poll succeeds and
// the operation has completed with failure, the error is returned and op.Done will return true.
// If Poll succeeds and the operation has completed successfully,
// op.Done will return true, and the response of the operation is returned.
// If Poll succeeds and the operation has not completed, the returned response and error are both nil.
func (op *UpdateInstanceOperation) Poll(ctx context.Context, opts ...gax.CallOption) (*memcachepb.Instance, error) {
var resp memcachepb.Instance
if err := op.lro.Poll(ctx, &resp, opts...); err != nil {
return nil, err
}
if !op.Done() {
return nil, nil
}
return &resp, nil
}
// Metadata returns metadata associated with the long-running operation.
// Metadata itself does not contact the server, but Poll does.
// To get the latest metadata, call this method after a successful call to Poll.
// If the metadata is not available, the returned metadata and error are both nil.
func (op *UpdateInstanceOperation) Metadata() (*memcachepb.OperationMetadata, error) {
var meta memcachepb.OperationMetadata
if err := op.lro.Metadata(&meta); err == longrunning.ErrNoMetadata {
return nil, nil
} else if err != nil {
return nil, err
}
return &meta, nil
}
// Done reports whether the long-running operation has completed.
func (op *UpdateInstanceOperation) Done() bool {
return op.lro.Done()
}
// Name returns the name of the long-running operation.
// The name is assigned by the server and is unique within the service from which the operation is created.
func (op *UpdateInstanceOperation) Name() string {
return op.lro.Name()
}
// UpdateParametersOperation manages a long-running operation from UpdateParameters.
type UpdateParametersOperation struct {
lro *longrunning.Operation
}
// UpdateParametersOperation returns a new UpdateParametersOperation from a given name.
// The name must be that of a previously created UpdateParametersOperation, possibly from a different process.
func (c *CloudMemcacheClient) UpdateParametersOperation(name string) *UpdateParametersOperation {
return &UpdateParametersOperation{
lro: longrunning.InternalNewOperation(c.LROClient, &longrunningpb.Operation{Name: name}),
}
}
// Wait blocks until the long-running operation is completed, returning the response and any errors encountered.
//
// See documentation of Poll for error-handling information.
func (op *UpdateParametersOperation) Wait(ctx context.Context, opts ...gax.CallOption) (*memcachepb.Instance, error) {
var resp memcachepb.Instance
if err := op.lro.WaitWithInterval(ctx, &resp, time.Minute, opts...); err != nil {
return nil, err
}
return &resp, nil
}
// Poll fetches the latest state of the long-running operation.
//
// Poll also fetches the latest metadata, which can be retrieved by Metadata.
//
// If Poll fails, the error is returned and op is unmodified. If Poll succeeds and
// the operation has completed with failure, the error is returned and op.Done will return true.
// If Poll succeeds and the operation has completed successfully,
// op.Done will return true, and the response of the operation is returned.
// If Poll succeeds and the operation has not completed, the returned response and error are both nil.
func (op *UpdateParametersOperation) Poll(ctx context.Context, opts ...gax.CallOption) (*memcachepb.Instance, error) {
var resp memcachepb.Instance
if err := op.lro.Poll(ctx, &resp, opts...); err != nil {
return nil, err
}
if !op.Done() {
return nil, nil
}
return &resp, nil
}
// Metadata returns metadata associated with the long-running operation.
// Metadata itself does not contact the server, but Poll does.
// To get the latest metadata, call this method after a successful call to Poll.
// If the metadata is not available, the returned metadata and error are both nil.
func (op *UpdateParametersOperation) Metadata() (*memcachepb.OperationMetadata, error) {
var meta memcachepb.OperationMetadata
if err := op.lro.Metadata(&meta); err == longrunning.ErrNoMetadata {
return nil, nil
} else if err != nil {
return nil, err
}
return &meta, nil
}
// Done reports whether the long-running operation has completed.
func (op *UpdateParametersOperation) Done() bool {
return op.lro.Done()
}
// Name returns the name of the long-running operation.
// The name is assigned by the server and is unique within the service from which the operation is created.
func (op *UpdateParametersOperation) Name() string {
return op.lro.Name()
}
// InstanceIterator manages a stream of *memcachepb.Instance.
type InstanceIterator struct {
items []*memcachepb.Instance
pageInfo *iterator.PageInfo
nextFunc func() error
// Response is the raw response for the current page.
// It must be cast to the RPC response type.
// Calling Next() or InternalFetch() updates this value.
Response interface{}
// InternalFetch is for use by the Google Cloud Libraries only.
// It is not part of the stable interface of this package.
//
// InternalFetch returns results from a single call to the underlying RPC.
// The number of results is no greater than pageSize.
// If there are no more results, nextPageToken is empty and err is nil.
InternalFetch func(pageSize int, pageToken string) (results []*memcachepb.Instance, nextPageToken string, err error)
}
// PageInfo supports pagination. See the google.golang.org/api/iterator package for details.
func (it *InstanceIterator) PageInfo() *iterator.PageInfo {
return it.pageInfo
}
// Next returns the next result. Its second return value is iterator.Done if there are no more
// results. Once Next returns Done, all subsequent calls will return Done.
func (it *InstanceIterator) Next() (*memcachepb.Instance, error) {
var item *memcachepb.Instance
if err := it.nextFunc(); err != nil {
return item, err
}
item = it.items[0]
it.items = it.items[1:]
return item, nil
}
func (it *InstanceIterator) bufLen() int {
return len(it.items)
}
func (it *InstanceIterator) takeBuf() interface{} {
b := it.items
it.items = nil
return b
}