vendor/cloud.google.com/go/logging/apiv2/logging_client.go - gddo - Git at Google

 // Copyright 2017, 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 logging

 import (
 	"math"
 	"time"

 	"cloud.google.com/go/internal/version"
 	gax "github.com/googleapis/gax-go"
 	"golang.org/x/net/context"
 	"google.golang.org/api/iterator"
 	"google.golang.org/api/option"
 	"google.golang.org/api/transport"
 	monitoredrespb "google.golang.org/genproto/googleapis/api/monitoredres"
 	loggingpb "google.golang.org/genproto/googleapis/logging/v2"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/codes"
 )

 // CallOptions contains the retry settings for each method of Client.
 type CallOptions struct {
 	DeleteLog                        []gax.CallOption
 	WriteLogEntries                  []gax.CallOption
 	ListLogEntries                   []gax.CallOption
 	ListMonitoredResourceDescriptors []gax.CallOption
 	ListLogs                         []gax.CallOption
 }

 func defaultClientOptions() []option.ClientOption {
 	return []option.ClientOption{
 		option.WithEndpoint("logging.googleapis.com:443"),
 		option.WithScopes(DefaultAuthScopes()...),
 	}
 }

 func defaultCallOptions() *CallOptions {
 	retry := map[[2]string][]gax.CallOption{
 		{"default", "idempotent"}: {
 			gax.WithRetry(func() gax.Retryer {
 				return gax.OnCodes([]codes.Code{
 					codes.DeadlineExceeded,
 					codes.Internal,
 					codes.Unavailable,
 				}, gax.Backoff{
 					Initial:    100 * time.Millisecond,
 					Max:        1000 * time.Millisecond,
 					Multiplier: 1.2,
 				})
 			}),
 		},
 		{"list", "idempotent"}: {
 			gax.WithRetry(func() gax.Retryer {
 				return gax.OnCodes([]codes.Code{
 					codes.DeadlineExceeded,
 					codes.Internal,
 					codes.Unavailable,
 				}, gax.Backoff{
 					Initial:    100 * time.Millisecond,
 					Max:        1000 * time.Millisecond,
 					Multiplier: 1.2,
 				})
 			}),
 		},
 	}
 	return &CallOptions{
 		DeleteLog:                        retry[[2]string{"default", "idempotent"}],
 		WriteLogEntries:                  retry[[2]string{"default", "non_idempotent"}],
 		ListLogEntries:                   retry[[2]string{"list", "idempotent"}],
 		ListMonitoredResourceDescriptors: retry[[2]string{"default", "idempotent"}],
 		ListLogs: retry[[2]string{"default", "idempotent"}],
 	}
 }

 // Client is a client for interacting with Stackdriver Logging API.
 type Client struct {
 	// The connection to the service.
 	conn *grpc.ClientConn

 	// The gRPC API client.
 	client loggingpb.LoggingServiceV2Client

 	// The call options for this service.
 	CallOptions *CallOptions

 	// The metadata to be sent with each request.
 	xGoogHeader []string
 }

 // NewClient creates a new logging service v2 client.
 //
 // Service for ingesting and querying logs.
 func NewClient(ctx context.Context, opts ...option.ClientOption) (*Client, error) {
 	conn, err := transport.DialGRPC(ctx, append(defaultClientOptions(), opts...)...)
 	if err != nil {
 		return nil, err
 	}
 	c := &Client{
 		conn:        conn,
 		CallOptions: defaultCallOptions(),

 		client: loggingpb.NewLoggingServiceV2Client(conn),
 	}
 	c.SetGoogleClientInfo()
 	return c, nil
 }

 // Connection returns the client's connection to the API service.
 func (c *Client) 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 *Client) 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 *Client) SetGoogleClientInfo(keyval ...string) {
 	kv := append([]string{"gl-go", version.Go()}, keyval...)
 	kv = append(kv, "gapic", version.Repo, "gax", gax.Version, "grpc", grpc.Version)
 	c.xGoogHeader = []string{gax.XGoogHeader(kv...)}
 }

 // ProjectPath returns the path for the project resource.
 func ProjectPath(project string) string {
 	return "" +
 		"projects/" +
 		project +
 		""
 }

 // LogPath returns the path for the log resource.
 func LogPath(project, log string) string {
 	return "" +
 		"projects/" +
 		project +
 		"/logs/" +
 		log +
 		""
 }

 // DeleteLog deletes all the log entries in a log.
 // The log reappears if it receives new entries.
 // Log entries written shortly before the delete operation might not be
 // deleted.
 func (c *Client) DeleteLog(ctx context.Context, req *loggingpb.DeleteLogRequest, opts ...gax.CallOption) error {
 	ctx = insertXGoog(ctx, c.xGoogHeader)
 	opts = append(c.CallOptions.DeleteLog[0:len(c.CallOptions.DeleteLog):len(c.CallOptions.DeleteLog)], opts...)
 	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
 		var err error
 		_, err = c.client.DeleteLog(ctx, req, settings.GRPC...)
 		return err
 	}, opts...)
 	return err
 }

 // WriteLogEntries writes log entries to Stackdriver Logging.
 func (c *Client) WriteLogEntries(ctx context.Context, req *loggingpb.WriteLogEntriesRequest, opts ...gax.CallOption) (*loggingpb.WriteLogEntriesResponse, error) {
 	ctx = insertXGoog(ctx, c.xGoogHeader)
 	opts = append(c.CallOptions.WriteLogEntries[0:len(c.CallOptions.WriteLogEntries):len(c.CallOptions.WriteLogEntries)], opts...)
 	var resp *loggingpb.WriteLogEntriesResponse
 	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
 		var err error
 		resp, err = c.client.WriteLogEntries(ctx, req, settings.GRPC...)
 		return err
 	}, opts...)
 	if err != nil {
 		return nil, err
 	}
 	return resp, nil
 }

 // ListLogEntries lists log entries.  Use this method to retrieve log entries from
 // Stackdriver Logging.  For ways to export log entries, see
 // Exporting Logs (at /logging/docs/export).
 func (c *Client) ListLogEntries(ctx context.Context, req *loggingpb.ListLogEntriesRequest, opts ...gax.CallOption) *LogEntryIterator {
 	ctx = insertXGoog(ctx, c.xGoogHeader)
 	opts = append(c.CallOptions.ListLogEntries[0:len(c.CallOptions.ListLogEntries):len(c.CallOptions.ListLogEntries)], opts...)
 	it := &LogEntryIterator{}
 	it.InternalFetch = func(pageSize int, pageToken string) ([]*loggingpb.LogEntry, string, error) {
 		var resp *loggingpb.ListLogEntriesResponse
 		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.client.ListLogEntries(ctx, req, settings.GRPC...)
 			return err
 		}, opts...)
 		if err != nil {
 			return nil, "", err
 		}
 		return resp.Entries, 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)
 	return it
 }

 // ListMonitoredResourceDescriptors lists the descriptors for monitored resource types used by Stackdriver
 // Logging.
 func (c *Client) ListMonitoredResourceDescriptors(ctx context.Context, req *loggingpb.ListMonitoredResourceDescriptorsRequest, opts ...gax.CallOption) *MonitoredResourceDescriptorIterator {
 	ctx = insertXGoog(ctx, c.xGoogHeader)
 	opts = append(c.CallOptions.ListMonitoredResourceDescriptors[0:len(c.CallOptions.ListMonitoredResourceDescriptors):len(c.CallOptions.ListMonitoredResourceDescriptors)], opts...)
 	it := &MonitoredResourceDescriptorIterator{}
 	it.InternalFetch = func(pageSize int, pageToken string) ([]*monitoredrespb.MonitoredResourceDescriptor, string, error) {
 		var resp *loggingpb.ListMonitoredResourceDescriptorsResponse
 		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.client.ListMonitoredResourceDescriptors(ctx, req, settings.GRPC...)
 			return err
 		}, opts...)
 		if err != nil {
 			return nil, "", err
 		}
 		return resp.ResourceDescriptors, 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)
 	return it
 }

 // ListLogs lists the logs in projects, organizations, folders, or billing accounts.
 // Only logs that have entries are listed.
 func (c *Client) ListLogs(ctx context.Context, req *loggingpb.ListLogsRequest, opts ...gax.CallOption) *StringIterator {
 	ctx = insertXGoog(ctx, c.xGoogHeader)
 	opts = append(c.CallOptions.ListLogs[0:len(c.CallOptions.ListLogs):len(c.CallOptions.ListLogs)], opts...)
 	it := &StringIterator{}
 	it.InternalFetch = func(pageSize int, pageToken string) ([]string, string, error) {
 		var resp *loggingpb.ListLogsResponse
 		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.client.ListLogs(ctx, req, settings.GRPC...)
 			return err
 		}, opts...)
 		if err != nil {
 			return nil, "", err
 		}
 		return resp.LogNames, 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)
 	return it
 }

 // LogEntryIterator manages a stream of *loggingpb.LogEntry.
 type LogEntryIterator struct {
 	items    []*loggingpb.LogEntry
 	pageInfo *iterator.PageInfo
 	nextFunc func() error

 	// 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 []*loggingpb.LogEntry, nextPageToken string, err error)
 }

 // PageInfo supports pagination. See the google.golang.org/api/iterator package for details.
 func (it *LogEntryIterator) 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 *LogEntryIterator) Next() (*loggingpb.LogEntry, error) {
 	var item *loggingpb.LogEntry
 	if err := it.nextFunc(); err != nil {
 		return item, err
 	}
 	item = it.items[0]
 	it.items = it.items[1:]
 	return item, nil
 }

 func (it *LogEntryIterator) bufLen() int {
 	return len(it.items)
 }

 func (it *LogEntryIterator) takeBuf() interface{} {
 	b := it.items
 	it.items = nil
 	return b
 }

 // MonitoredResourceDescriptorIterator manages a stream of *monitoredrespb.MonitoredResourceDescriptor.
 type MonitoredResourceDescriptorIterator struct {
 	items    []*monitoredrespb.MonitoredResourceDescriptor
 	pageInfo *iterator.PageInfo
 	nextFunc func() error

 	// 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 []*monitoredrespb.MonitoredResourceDescriptor, nextPageToken string, err error)
 }

 // PageInfo supports pagination. See the google.golang.org/api/iterator package for details.
 func (it *MonitoredResourceDescriptorIterator) 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 *MonitoredResourceDescriptorIterator) Next() (*monitoredrespb.MonitoredResourceDescriptor, error) {
 	var item *monitoredrespb.MonitoredResourceDescriptor
 	if err := it.nextFunc(); err != nil {
 		return item, err
 	}
 	item = it.items[0]
 	it.items = it.items[1:]
 	return item, nil
 }

 func (it *MonitoredResourceDescriptorIterator) bufLen() int {
 	return len(it.items)
 }

 func (it *MonitoredResourceDescriptorIterator) takeBuf() interface{} {
 	b := it.items
 	it.items = nil
 	return b
 }

 // StringIterator manages a stream of string.
 type StringIterator struct {
 	items    []string
 	pageInfo *iterator.PageInfo
 	nextFunc func() error

 	// 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 []string, nextPageToken string, err error)
 }

 // PageInfo supports pagination. See the google.golang.org/api/iterator package for details.
 func (it *StringIterator) 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 *StringIterator) Next() (string, error) {
 	var item string
 	if err := it.nextFunc(); err != nil {
 		return item, err
 	}
 	item = it.items[0]
 	it.items = it.items[1:]
 	return item, nil
 }

 func (it *StringIterator) bufLen() int {
 	return len(it.items)
 }

 func (it *StringIterator) takeBuf() interface{} {
 	b := it.items
 	it.items = nil
 	return b
 }
	// Copyright 2017, 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 logging

	import (
	"math"
	"time"

	"cloud.google.com/go/internal/version"
	gax "github.com/googleapis/gax-go"
	"golang.org/x/net/context"
	"google.golang.org/api/iterator"
	"google.golang.org/api/option"
	"google.golang.org/api/transport"
	monitoredrespb "google.golang.org/genproto/googleapis/api/monitoredres"
	loggingpb "google.golang.org/genproto/googleapis/logging/v2"
	"google.golang.org/grpc"
	"google.golang.org/grpc/codes"
	)

	// CallOptions contains the retry settings for each method of Client.
	type CallOptions struct {
	DeleteLog []gax.CallOption
	WriteLogEntries []gax.CallOption
	ListLogEntries []gax.CallOption
	ListMonitoredResourceDescriptors []gax.CallOption
	ListLogs []gax.CallOption
	}

	func defaultClientOptions() []option.ClientOption {
	return []option.ClientOption{
	option.WithEndpoint("logging.googleapis.com:443"),
	option.WithScopes(DefaultAuthScopes()...),
	}
	}

	func defaultCallOptions() *CallOptions {
	retry := map[[2]string][]gax.CallOption{
	{"default", "idempotent"}: {
	gax.WithRetry(func() gax.Retryer {
	return gax.OnCodes([]codes.Code{
	codes.DeadlineExceeded,
	codes.Internal,
	codes.Unavailable,
	}, gax.Backoff{
	Initial: 100 * time.Millisecond,
	Max: 1000 * time.Millisecond,
	Multiplier: 1.2,
	})
	}),
	},
	{"list", "idempotent"}: {
	gax.WithRetry(func() gax.Retryer {
	return gax.OnCodes([]codes.Code{
	codes.DeadlineExceeded,
	codes.Internal,
	codes.Unavailable,
	}, gax.Backoff{
	Initial: 100 * time.Millisecond,
	Max: 1000 * time.Millisecond,
	Multiplier: 1.2,
	})
	}),
	},
	}
	return &CallOptions{
	DeleteLog: retry[[2]string{"default", "idempotent"}],
	WriteLogEntries: retry[[2]string{"default", "non_idempotent"}],
	ListLogEntries: retry[[2]string{"list", "idempotent"}],
	ListMonitoredResourceDescriptors: retry[[2]string{"default", "idempotent"}],
	ListLogs: retry[[2]string{"default", "idempotent"}],
	}
	}

	// Client is a client for interacting with Stackdriver Logging API.
	type Client struct {
	// The connection to the service.
	conn *grpc.ClientConn

	// The gRPC API client.
	client loggingpb.LoggingServiceV2Client

	// The call options for this service.
	CallOptions *CallOptions

	// The metadata to be sent with each request.
	xGoogHeader []string
	}

	// NewClient creates a new logging service v2 client.
	//
	// Service for ingesting and querying logs.
	func NewClient(ctx context.Context, opts ...option.ClientOption) (*Client, error) {
	conn, err := transport.DialGRPC(ctx, append(defaultClientOptions(), opts...)...)
	if err != nil {
	return nil, err
	}
	c := &Client{
	conn: conn,
	CallOptions: defaultCallOptions(),

	client: loggingpb.NewLoggingServiceV2Client(conn),
	}
	c.SetGoogleClientInfo()
	return c, nil
	}

	// Connection returns the client's connection to the API service.
	func (c Client) 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 *Client) 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 *Client) SetGoogleClientInfo(keyval ...string) {
	kv := append([]string{"gl-go", version.Go()}, keyval...)
	kv = append(kv, "gapic", version.Repo, "gax", gax.Version, "grpc", grpc.Version)
	c.xGoogHeader = []string{gax.XGoogHeader(kv...)}
	}

	// ProjectPath returns the path for the project resource.
	func ProjectPath(project string) string {
	return "" +
	"projects/" +
	project +
	""
	}

	// LogPath returns the path for the log resource.
	func LogPath(project, log string) string {
	return "" +
	"projects/" +
	project +
	"/logs/" +
	log +
	""
	}

	// DeleteLog deletes all the log entries in a log.
	// The log reappears if it receives new entries.
	// Log entries written shortly before the delete operation might not be
	// deleted.
	func (c Client) DeleteLog(ctx context.Context, req loggingpb.DeleteLogRequest, opts ...gax.CallOption) error {
	ctx = insertXGoog(ctx, c.xGoogHeader)
	opts = append(c.CallOptions.DeleteLog[0:len(c.CallOptions.DeleteLog):len(c.CallOptions.DeleteLog)], opts...)
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
	var err error
	_, err = c.client.DeleteLog(ctx, req, settings.GRPC...)
	return err
	}, opts...)
	return err
	}

	// WriteLogEntries writes log entries to Stackdriver Logging.
	func (c Client) WriteLogEntries(ctx context.Context, req loggingpb.WriteLogEntriesRequest, opts ...gax.CallOption) (*loggingpb.WriteLogEntriesResponse, error) {
	ctx = insertXGoog(ctx, c.xGoogHeader)
	opts = append(c.CallOptions.WriteLogEntries[0:len(c.CallOptions.WriteLogEntries):len(c.CallOptions.WriteLogEntries)], opts...)
	var resp *loggingpb.WriteLogEntriesResponse
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
	var err error
	resp, err = c.client.WriteLogEntries(ctx, req, settings.GRPC...)
	return err
	}, opts...)
	if err != nil {
	return nil, err
	}
	return resp, nil
	}

	// ListLogEntries lists log entries. Use this method to retrieve log entries from
	// Stackdriver Logging. For ways to export log entries, see
	// Exporting Logs (at /logging/docs/export).
	func (c Client) ListLogEntries(ctx context.Context, req loggingpb.ListLogEntriesRequest, opts ...gax.CallOption) *LogEntryIterator {
	ctx = insertXGoog(ctx, c.xGoogHeader)
	opts = append(c.CallOptions.ListLogEntries[0:len(c.CallOptions.ListLogEntries):len(c.CallOptions.ListLogEntries)], opts...)
	it := &LogEntryIterator{}
	it.InternalFetch = func(pageSize int, pageToken string) ([]*loggingpb.LogEntry, string, error) {
	var resp *loggingpb.ListLogEntriesResponse
	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.client.ListLogEntries(ctx, req, settings.GRPC...)
	return err
	}, opts...)
	if err != nil {
	return nil, "", err
	}
	return resp.Entries, 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)
	return it
	}

	// ListMonitoredResourceDescriptors lists the descriptors for monitored resource types used by Stackdriver
	// Logging.
	func (c Client) ListMonitoredResourceDescriptors(ctx context.Context, req loggingpb.ListMonitoredResourceDescriptorsRequest, opts ...gax.CallOption) *MonitoredResourceDescriptorIterator {
	ctx = insertXGoog(ctx, c.xGoogHeader)
	opts = append(c.CallOptions.ListMonitoredResourceDescriptors[0:len(c.CallOptions.ListMonitoredResourceDescriptors):len(c.CallOptions.ListMonitoredResourceDescriptors)], opts...)
	it := &MonitoredResourceDescriptorIterator{}
	it.InternalFetch = func(pageSize int, pageToken string) ([]*monitoredrespb.MonitoredResourceDescriptor, string, error) {
	var resp *loggingpb.ListMonitoredResourceDescriptorsResponse
	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.client.ListMonitoredResourceDescriptors(ctx, req, settings.GRPC...)
	return err
	}, opts...)
	if err != nil {
	return nil, "", err
	}
	return resp.ResourceDescriptors, 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)
	return it
	}

	// ListLogs lists the logs in projects, organizations, folders, or billing accounts.
	// Only logs that have entries are listed.
	func (c Client) ListLogs(ctx context.Context, req loggingpb.ListLogsRequest, opts ...gax.CallOption) *StringIterator {
	ctx = insertXGoog(ctx, c.xGoogHeader)
	opts = append(c.CallOptions.ListLogs[0:len(c.CallOptions.ListLogs):len(c.CallOptions.ListLogs)], opts...)
	it := &StringIterator{}
	it.InternalFetch = func(pageSize int, pageToken string) ([]string, string, error) {
	var resp *loggingpb.ListLogsResponse
	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.client.ListLogs(ctx, req, settings.GRPC...)
	return err
	}, opts...)
	if err != nil {
	return nil, "", err
	}
	return resp.LogNames, 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)
	return it
	}

	// LogEntryIterator manages a stream of *loggingpb.LogEntry.
	type LogEntryIterator struct {
	items []*loggingpb.LogEntry
	pageInfo *iterator.PageInfo
	nextFunc func() error

	// 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 []*loggingpb.LogEntry, nextPageToken string, err error)
	}

	// PageInfo supports pagination. See the google.golang.org/api/iterator package for details.
	func (it LogEntryIterator) 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 LogEntryIterator) Next() (loggingpb.LogEntry, error) {
	var item *loggingpb.LogEntry
	if err := it.nextFunc(); err != nil {
	return item, err
	}
	item = it.items[0]
	it.items = it.items[1:]
	return item, nil
	}

	func (it *LogEntryIterator) bufLen() int {
	return len(it.items)
	}

	func (it *LogEntryIterator) takeBuf() interface{} {
	b := it.items
	it.items = nil
	return b
	}

	// MonitoredResourceDescriptorIterator manages a stream of *monitoredrespb.MonitoredResourceDescriptor.
	type MonitoredResourceDescriptorIterator struct {
	items []*monitoredrespb.MonitoredResourceDescriptor
	pageInfo *iterator.PageInfo
	nextFunc func() error

	// 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 []*monitoredrespb.MonitoredResourceDescriptor, nextPageToken string, err error)
	}

	// PageInfo supports pagination. See the google.golang.org/api/iterator package for details.
	func (it MonitoredResourceDescriptorIterator) 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 MonitoredResourceDescriptorIterator) Next() (monitoredrespb.MonitoredResourceDescriptor, error) {
	var item *monitoredrespb.MonitoredResourceDescriptor
	if err := it.nextFunc(); err != nil {
	return item, err
	}
	item = it.items[0]
	it.items = it.items[1:]
	return item, nil
	}

	func (it *MonitoredResourceDescriptorIterator) bufLen() int {
	return len(it.items)
	}

	func (it *MonitoredResourceDescriptorIterator) takeBuf() interface{} {
	b := it.items
	it.items = nil
	return b
	}

	// StringIterator manages a stream of string.
	type StringIterator struct {
	items []string
	pageInfo *iterator.PageInfo
	nextFunc func() error

	// 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 []string, nextPageToken string, err error)
	}

	// PageInfo supports pagination. See the google.golang.org/api/iterator package for details.
	func (it StringIterator) 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 *StringIterator) Next() (string, error) {
	var item string
	if err := it.nextFunc(); err != nil {
	return item, err
	}
	item = it.items[0]
	it.items = it.items[1:]
	return item, nil
	}

	func (it *StringIterator) bufLen() int {
	return len(it.items)
	}

	func (it *StringIterator) takeBuf() interface{} {
	b := it.items
	it.items = nil
	return b
	}