monitoring/apiv3/metric_client.go - gocloud - Git at Google

 // 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 monitoring

 import (
 	"fmt"
 	"math"
 	"runtime"
 	"time"

 	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"
 	metricpb "google.golang.org/genproto/googleapis/api/metric"
 	monitoredrespb "google.golang.org/genproto/googleapis/api/monitoredres"
 	monitoringpb "google.golang.org/genproto/googleapis/monitoring/v3"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/metadata"
 )

 var (
 	metricProjectPathTemplate                     = gax.MustCompilePathTemplate("projects/{project}")
 	metricMetricDescriptorPathTemplate            = gax.MustCompilePathTemplate("projects/{project}/metricDescriptors/{metric_descriptor=**}")
 	metricMonitoredResourceDescriptorPathTemplate = gax.MustCompilePathTemplate("projects/{project}/monitoredResourceDescriptors/{monitored_resource_descriptor}")
 )

 // MetricCallOptions contains the retry settings for each method of MetricClient.
 type MetricCallOptions struct {
 	ListMonitoredResourceDescriptors []gax.CallOption
 	GetMonitoredResourceDescriptor   []gax.CallOption
 	ListMetricDescriptors            []gax.CallOption
 	GetMetricDescriptor              []gax.CallOption
 	CreateMetricDescriptor           []gax.CallOption
 	DeleteMetricDescriptor           []gax.CallOption
 	ListTimeSeries                   []gax.CallOption
 	CreateTimeSeries                 []gax.CallOption
 }

 func defaultMetricClientOptions() []option.ClientOption {
 	return []option.ClientOption{
 		option.WithEndpoint("monitoring.googleapis.com:443"),
 		option.WithScopes(
 			"https://www.googleapis.com/auth/cloud-platform",
 			"https://www.googleapis.com/auth/monitoring",
 			"https://www.googleapis.com/auth/monitoring.read",
 			"https://www.googleapis.com/auth/monitoring.write",
 		),
 	}
 }

 func defaultMetricCallOptions() *MetricCallOptions {
 	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 &MetricCallOptions{
 		ListMonitoredResourceDescriptors: retry[[2]string{"default", "idempotent"}],
 		GetMonitoredResourceDescriptor:   retry[[2]string{"default", "idempotent"}],
 		ListMetricDescriptors:            retry[[2]string{"default", "idempotent"}],
 		GetMetricDescriptor:              retry[[2]string{"default", "idempotent"}],
 		CreateMetricDescriptor:           retry[[2]string{"default", "non_idempotent"}],
 		DeleteMetricDescriptor:           retry[[2]string{"default", "idempotent"}],
 		ListTimeSeries:                   retry[[2]string{"default", "idempotent"}],
 		CreateTimeSeries:                 retry[[2]string{"default", "non_idempotent"}],
 	}
 }

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

 	// The gRPC API client.
 	metricClient monitoringpb.MetricServiceClient

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

 	// The metadata to be sent with each request.
 	metadata metadata.MD
 }

 // NewMetricClient creates a new metric service client.
 //
 // Manages metric descriptors, monitored resource descriptors, and
 // time series data.
 func NewMetricClient(ctx context.Context, opts ...option.ClientOption) (*MetricClient, error) {
 	conn, err := transport.DialGRPC(ctx, append(defaultMetricClientOptions(), opts...)...)
 	if err != nil {
 		return nil, err
 	}
 	c := &MetricClient{
 		conn:        conn,
 		CallOptions: defaultMetricCallOptions(),

 		metricClient: monitoringpb.NewMetricServiceClient(conn),
 	}
 	c.SetGoogleClientInfo("gax", gax.Version)
 	return c, nil
 }

 // Connection returns the client's connection to the API service.
 func (c *MetricClient) 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 *MetricClient) 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 *MetricClient) SetGoogleClientInfo(name, version string) {
 	v := fmt.Sprintf("%s/%s %s gax/%s go/%s", name, version, gapicNameVersion, gax.Version, runtime.Version())
 	c.metadata = metadata.Pairs("x-goog-api-client", v)
 }

 // MetricProjectPath returns the path for the project resource.
 func MetricProjectPath(project string) string {
 	path, err := metricProjectPathTemplate.Render(map[string]string{
 		"project": project,
 	})
 	if err != nil {
 		panic(err)
 	}
 	return path
 }

 // MetricMetricDescriptorPath returns the path for the metric descriptor resource.
 func MetricMetricDescriptorPath(project, metricDescriptor string) string {
 	path, err := metricMetricDescriptorPathTemplate.Render(map[string]string{
 		"project":           project,
 		"metric_descriptor": metricDescriptor,
 	})
 	if err != nil {
 		panic(err)
 	}
 	return path
 }

 // MetricMonitoredResourceDescriptorPath returns the path for the monitored resource descriptor resource.
 func MetricMonitoredResourceDescriptorPath(project, monitoredResourceDescriptor string) string {
 	path, err := metricMonitoredResourceDescriptorPathTemplate.Render(map[string]string{
 		"project":                       project,
 		"monitored_resource_descriptor": monitoredResourceDescriptor,
 	})
 	if err != nil {
 		panic(err)
 	}
 	return path
 }

 // ListMonitoredResourceDescriptors lists monitored resource descriptors that match a filter. This method does not require a Stackdriver account.
 func (c *MetricClient) ListMonitoredResourceDescriptors(ctx context.Context, req *monitoringpb.ListMonitoredResourceDescriptorsRequest) *MonitoredResourceDescriptorIterator {
 	md, _ := metadata.FromContext(ctx)
 	ctx = metadata.NewContext(ctx, metadata.Join(md, c.metadata))
 	it := &MonitoredResourceDescriptorIterator{}
 	it.InternalFetch = func(pageSize int, pageToken string) ([]*monitoredrespb.MonitoredResourceDescriptor, string, error) {
 		var resp *monitoringpb.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) error {
 			var err error
 			resp, err = c.metricClient.ListMonitoredResourceDescriptors(ctx, req)
 			return err
 		}, c.CallOptions.ListMonitoredResourceDescriptors...)
 		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
 }

 // GetMonitoredResourceDescriptor gets a single monitored resource descriptor. This method does not require a Stackdriver account.
 func (c *MetricClient) GetMonitoredResourceDescriptor(ctx context.Context, req *monitoringpb.GetMonitoredResourceDescriptorRequest) (*monitoredrespb.MonitoredResourceDescriptor, error) {
 	md, _ := metadata.FromContext(ctx)
 	ctx = metadata.NewContext(ctx, metadata.Join(md, c.metadata))
 	var resp *monitoredrespb.MonitoredResourceDescriptor
 	err := gax.Invoke(ctx, func(ctx context.Context) error {
 		var err error
 		resp, err = c.metricClient.GetMonitoredResourceDescriptor(ctx, req)
 		return err
 	}, c.CallOptions.GetMonitoredResourceDescriptor...)
 	if err != nil {
 		return nil, err
 	}
 	return resp, nil
 }

 // ListMetricDescriptors lists metric descriptors that match a filter. This method does not require a Stackdriver account.
 func (c *MetricClient) ListMetricDescriptors(ctx context.Context, req *monitoringpb.ListMetricDescriptorsRequest) *MetricDescriptorIterator {
 	md, _ := metadata.FromContext(ctx)
 	ctx = metadata.NewContext(ctx, metadata.Join(md, c.metadata))
 	it := &MetricDescriptorIterator{}
 	it.InternalFetch = func(pageSize int, pageToken string) ([]*metricpb.MetricDescriptor, string, error) {
 		var resp *monitoringpb.ListMetricDescriptorsResponse
 		req.PageToken = pageToken
 		if pageSize > math.MaxInt32 {
 			req.PageSize = math.MaxInt32
 		} else {
 			req.PageSize = int32(pageSize)
 		}
 		err := gax.Invoke(ctx, func(ctx context.Context) error {
 			var err error
 			resp, err = c.metricClient.ListMetricDescriptors(ctx, req)
 			return err
 		}, c.CallOptions.ListMetricDescriptors...)
 		if err != nil {
 			return nil, "", err
 		}
 		return resp.MetricDescriptors, 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
 }

 // GetMetricDescriptor gets a single metric descriptor. This method does not require a Stackdriver account.
 func (c *MetricClient) GetMetricDescriptor(ctx context.Context, req *monitoringpb.GetMetricDescriptorRequest) (*metricpb.MetricDescriptor, error) {
 	md, _ := metadata.FromContext(ctx)
 	ctx = metadata.NewContext(ctx, metadata.Join(md, c.metadata))
 	var resp *metricpb.MetricDescriptor
 	err := gax.Invoke(ctx, func(ctx context.Context) error {
 		var err error
 		resp, err = c.metricClient.GetMetricDescriptor(ctx, req)
 		return err
 	}, c.CallOptions.GetMetricDescriptor...)
 	if err != nil {
 		return nil, err
 	}
 	return resp, nil
 }

 // CreateMetricDescriptor creates a new metric descriptor.
 // User-created metric descriptors define
 // [custom metrics](/monitoring/custom-metrics).
 func (c *MetricClient) CreateMetricDescriptor(ctx context.Context, req *monitoringpb.CreateMetricDescriptorRequest) (*metricpb.MetricDescriptor, error) {
 	md, _ := metadata.FromContext(ctx)
 	ctx = metadata.NewContext(ctx, metadata.Join(md, c.metadata))
 	var resp *metricpb.MetricDescriptor
 	err := gax.Invoke(ctx, func(ctx context.Context) error {
 		var err error
 		resp, err = c.metricClient.CreateMetricDescriptor(ctx, req)
 		return err
 	}, c.CallOptions.CreateMetricDescriptor...)
 	if err != nil {
 		return nil, err
 	}
 	return resp, nil
 }

 // DeleteMetricDescriptor deletes a metric descriptor. Only user-created
 // [custom metrics](/monitoring/custom-metrics) can be deleted.
 func (c *MetricClient) DeleteMetricDescriptor(ctx context.Context, req *monitoringpb.DeleteMetricDescriptorRequest) error {
 	md, _ := metadata.FromContext(ctx)
 	ctx = metadata.NewContext(ctx, metadata.Join(md, c.metadata))
 	err := gax.Invoke(ctx, func(ctx context.Context) error {
 		var err error
 		_, err = c.metricClient.DeleteMetricDescriptor(ctx, req)
 		return err
 	}, c.CallOptions.DeleteMetricDescriptor...)
 	return err
 }

 // ListTimeSeries lists time series that match a filter. This method does not require a Stackdriver account.
 func (c *MetricClient) ListTimeSeries(ctx context.Context, req *monitoringpb.ListTimeSeriesRequest) *TimeSeriesIterator {
 	md, _ := metadata.FromContext(ctx)
 	ctx = metadata.NewContext(ctx, metadata.Join(md, c.metadata))
 	it := &TimeSeriesIterator{}
 	it.InternalFetch = func(pageSize int, pageToken string) ([]*monitoringpb.TimeSeries, string, error) {
 		var resp *monitoringpb.ListTimeSeriesResponse
 		req.PageToken = pageToken
 		if pageSize > math.MaxInt32 {
 			req.PageSize = math.MaxInt32
 		} else {
 			req.PageSize = int32(pageSize)
 		}
 		err := gax.Invoke(ctx, func(ctx context.Context) error {
 			var err error
 			resp, err = c.metricClient.ListTimeSeries(ctx, req)
 			return err
 		}, c.CallOptions.ListTimeSeries...)
 		if err != nil {
 			return nil, "", err
 		}
 		return resp.TimeSeries, 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
 }

 // CreateTimeSeries creates or adds data to one or more time series.
 // The response is empty if all time series in the request were written.
 // If any time series could not be written, a corresponding failure message is
 // included in the error response.
 func (c *MetricClient) CreateTimeSeries(ctx context.Context, req *monitoringpb.CreateTimeSeriesRequest) error {
 	md, _ := metadata.FromContext(ctx)
 	ctx = metadata.NewContext(ctx, metadata.Join(md, c.metadata))
 	err := gax.Invoke(ctx, func(ctx context.Context) error {
 		var err error
 		_, err = c.metricClient.CreateTimeSeries(ctx, req)
 		return err
 	}, c.CallOptions.CreateTimeSeries...)
 	return err
 }

 // MetricDescriptorIterator manages a stream of *metricpb.MetricDescriptor.
 type MetricDescriptorIterator struct {
 	items    []*metricpb.MetricDescriptor
 	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 []*metricpb.MetricDescriptor, nextPageToken string, err error)
 }

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

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

 func (it *MetricDescriptorIterator) 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) {
 	if err := it.nextFunc(); err != nil {
 		return nil, 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
 }

 // TimeSeriesIterator manages a stream of *monitoringpb.TimeSeries.
 type TimeSeriesIterator struct {
 	items    []*monitoringpb.TimeSeries
 	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 []*monitoringpb.TimeSeries, nextPageToken string, err error)
 }

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

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

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

	import (
	"fmt"
	"math"
	"runtime"
	"time"

	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"
	metricpb "google.golang.org/genproto/googleapis/api/metric"
	monitoredrespb "google.golang.org/genproto/googleapis/api/monitoredres"
	monitoringpb "google.golang.org/genproto/googleapis/monitoring/v3"
	"google.golang.org/grpc"
	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/metadata"
	)

	var (
	metricProjectPathTemplate = gax.MustCompilePathTemplate("projects/{project}")
	metricMetricDescriptorPathTemplate = gax.MustCompilePathTemplate("projects/{project}/metricDescriptors/{metric_descriptor=**}")
	metricMonitoredResourceDescriptorPathTemplate = gax.MustCompilePathTemplate("projects/{project}/monitoredResourceDescriptors/{monitored_resource_descriptor}")
	)

	// MetricCallOptions contains the retry settings for each method of MetricClient.
	type MetricCallOptions struct {
	ListMonitoredResourceDescriptors []gax.CallOption
	GetMonitoredResourceDescriptor []gax.CallOption
	ListMetricDescriptors []gax.CallOption
	GetMetricDescriptor []gax.CallOption
	CreateMetricDescriptor []gax.CallOption
	DeleteMetricDescriptor []gax.CallOption
	ListTimeSeries []gax.CallOption
	CreateTimeSeries []gax.CallOption
	}

	func defaultMetricClientOptions() []option.ClientOption {
	return []option.ClientOption{
	option.WithEndpoint("monitoring.googleapis.com:443"),
	option.WithScopes(
	"https://www.googleapis.com/auth/cloud-platform",
	"https://www.googleapis.com/auth/monitoring",
	"https://www.googleapis.com/auth/monitoring.read",
	"https://www.googleapis.com/auth/monitoring.write",
	),
	}
	}

	func defaultMetricCallOptions() *MetricCallOptions {
	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 &MetricCallOptions{
	ListMonitoredResourceDescriptors: retry[[2]string{"default", "idempotent"}],
	GetMonitoredResourceDescriptor: retry[[2]string{"default", "idempotent"}],
	ListMetricDescriptors: retry[[2]string{"default", "idempotent"}],
	GetMetricDescriptor: retry[[2]string{"default", "idempotent"}],
	CreateMetricDescriptor: retry[[2]string{"default", "non_idempotent"}],
	DeleteMetricDescriptor: retry[[2]string{"default", "idempotent"}],
	ListTimeSeries: retry[[2]string{"default", "idempotent"}],
	CreateTimeSeries: retry[[2]string{"default", "non_idempotent"}],
	}
	}

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

	// The gRPC API client.
	metricClient monitoringpb.MetricServiceClient

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

	// The metadata to be sent with each request.
	metadata metadata.MD
	}

	// NewMetricClient creates a new metric service client.
	//
	// Manages metric descriptors, monitored resource descriptors, and
	// time series data.
	func NewMetricClient(ctx context.Context, opts ...option.ClientOption) (*MetricClient, error) {
	conn, err := transport.DialGRPC(ctx, append(defaultMetricClientOptions(), opts...)...)
	if err != nil {
	return nil, err
	}
	c := &MetricClient{
	conn: conn,
	CallOptions: defaultMetricCallOptions(),

	metricClient: monitoringpb.NewMetricServiceClient(conn),
	}
	c.SetGoogleClientInfo("gax", gax.Version)
	return c, nil
	}

	// Connection returns the client's connection to the API service.
	func (c MetricClient) 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 *MetricClient) 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 *MetricClient) SetGoogleClientInfo(name, version string) {
	v := fmt.Sprintf("%s/%s %s gax/%s go/%s", name, version, gapicNameVersion, gax.Version, runtime.Version())
	c.metadata = metadata.Pairs("x-goog-api-client", v)
	}

	// MetricProjectPath returns the path for the project resource.
	func MetricProjectPath(project string) string {
	path, err := metricProjectPathTemplate.Render(map[string]string{
	"project": project,
	})
	if err != nil {
	panic(err)
	}
	return path
	}

	// MetricMetricDescriptorPath returns the path for the metric descriptor resource.
	func MetricMetricDescriptorPath(project, metricDescriptor string) string {
	path, err := metricMetricDescriptorPathTemplate.Render(map[string]string{
	"project": project,
	"metric_descriptor": metricDescriptor,
	})
	if err != nil {
	panic(err)
	}
	return path
	}

	// MetricMonitoredResourceDescriptorPath returns the path for the monitored resource descriptor resource.
	func MetricMonitoredResourceDescriptorPath(project, monitoredResourceDescriptor string) string {
	path, err := metricMonitoredResourceDescriptorPathTemplate.Render(map[string]string{
	"project": project,
	"monitored_resource_descriptor": monitoredResourceDescriptor,
	})
	if err != nil {
	panic(err)
	}
	return path
	}

	// ListMonitoredResourceDescriptors lists monitored resource descriptors that match a filter. This method does not require a Stackdriver account.
	func (c MetricClient) ListMonitoredResourceDescriptors(ctx context.Context, req monitoringpb.ListMonitoredResourceDescriptorsRequest) *MonitoredResourceDescriptorIterator {
	md, _ := metadata.FromContext(ctx)
	ctx = metadata.NewContext(ctx, metadata.Join(md, c.metadata))
	it := &MonitoredResourceDescriptorIterator{}
	it.InternalFetch = func(pageSize int, pageToken string) ([]*monitoredrespb.MonitoredResourceDescriptor, string, error) {
	var resp *monitoringpb.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) error {
	var err error
	resp, err = c.metricClient.ListMonitoredResourceDescriptors(ctx, req)
	return err
	}, c.CallOptions.ListMonitoredResourceDescriptors...)
	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
	}

	// GetMonitoredResourceDescriptor gets a single monitored resource descriptor. This method does not require a Stackdriver account.
	func (c MetricClient) GetMonitoredResourceDescriptor(ctx context.Context, req monitoringpb.GetMonitoredResourceDescriptorRequest) (*monitoredrespb.MonitoredResourceDescriptor, error) {
	md, _ := metadata.FromContext(ctx)
	ctx = metadata.NewContext(ctx, metadata.Join(md, c.metadata))
	var resp *monitoredrespb.MonitoredResourceDescriptor
	err := gax.Invoke(ctx, func(ctx context.Context) error {
	var err error
	resp, err = c.metricClient.GetMonitoredResourceDescriptor(ctx, req)
	return err
	}, c.CallOptions.GetMonitoredResourceDescriptor...)
	if err != nil {
	return nil, err
	}
	return resp, nil
	}

	// ListMetricDescriptors lists metric descriptors that match a filter. This method does not require a Stackdriver account.
	func (c MetricClient) ListMetricDescriptors(ctx context.Context, req monitoringpb.ListMetricDescriptorsRequest) *MetricDescriptorIterator {
	md, _ := metadata.FromContext(ctx)
	ctx = metadata.NewContext(ctx, metadata.Join(md, c.metadata))
	it := &MetricDescriptorIterator{}
	it.InternalFetch = func(pageSize int, pageToken string) ([]*metricpb.MetricDescriptor, string, error) {
	var resp *monitoringpb.ListMetricDescriptorsResponse
	req.PageToken = pageToken
	if pageSize > math.MaxInt32 {
	req.PageSize = math.MaxInt32
	} else {
	req.PageSize = int32(pageSize)
	}
	err := gax.Invoke(ctx, func(ctx context.Context) error {
	var err error
	resp, err = c.metricClient.ListMetricDescriptors(ctx, req)
	return err
	}, c.CallOptions.ListMetricDescriptors...)
	if err != nil {
	return nil, "", err
	}
	return resp.MetricDescriptors, 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
	}

	// GetMetricDescriptor gets a single metric descriptor. This method does not require a Stackdriver account.
	func (c MetricClient) GetMetricDescriptor(ctx context.Context, req monitoringpb.GetMetricDescriptorRequest) (*metricpb.MetricDescriptor, error) {
	md, _ := metadata.FromContext(ctx)
	ctx = metadata.NewContext(ctx, metadata.Join(md, c.metadata))
	var resp *metricpb.MetricDescriptor
	err := gax.Invoke(ctx, func(ctx context.Context) error {
	var err error
	resp, err = c.metricClient.GetMetricDescriptor(ctx, req)
	return err
	}, c.CallOptions.GetMetricDescriptor...)
	if err != nil {
	return nil, err
	}
	return resp, nil
	}

	// CreateMetricDescriptor creates a new metric descriptor.
	// User-created metric descriptors define
	// [custom metrics](/monitoring/custom-metrics).
	func (c MetricClient) CreateMetricDescriptor(ctx context.Context, req monitoringpb.CreateMetricDescriptorRequest) (*metricpb.MetricDescriptor, error) {
	md, _ := metadata.FromContext(ctx)
	ctx = metadata.NewContext(ctx, metadata.Join(md, c.metadata))
	var resp *metricpb.MetricDescriptor
	err := gax.Invoke(ctx, func(ctx context.Context) error {
	var err error
	resp, err = c.metricClient.CreateMetricDescriptor(ctx, req)
	return err
	}, c.CallOptions.CreateMetricDescriptor...)
	if err != nil {
	return nil, err
	}
	return resp, nil
	}

	// DeleteMetricDescriptor deletes a metric descriptor. Only user-created
	// [custom metrics](/monitoring/custom-metrics) can be deleted.
	func (c MetricClient) DeleteMetricDescriptor(ctx context.Context, req monitoringpb.DeleteMetricDescriptorRequest) error {
	md, _ := metadata.FromContext(ctx)
	ctx = metadata.NewContext(ctx, metadata.Join(md, c.metadata))
	err := gax.Invoke(ctx, func(ctx context.Context) error {
	var err error
	_, err = c.metricClient.DeleteMetricDescriptor(ctx, req)
	return err
	}, c.CallOptions.DeleteMetricDescriptor...)
	return err
	}

	// ListTimeSeries lists time series that match a filter. This method does not require a Stackdriver account.
	func (c MetricClient) ListTimeSeries(ctx context.Context, req monitoringpb.ListTimeSeriesRequest) *TimeSeriesIterator {
	md, _ := metadata.FromContext(ctx)
	ctx = metadata.NewContext(ctx, metadata.Join(md, c.metadata))
	it := &TimeSeriesIterator{}
	it.InternalFetch = func(pageSize int, pageToken string) ([]*monitoringpb.TimeSeries, string, error) {
	var resp *monitoringpb.ListTimeSeriesResponse
	req.PageToken = pageToken
	if pageSize > math.MaxInt32 {
	req.PageSize = math.MaxInt32
	} else {
	req.PageSize = int32(pageSize)
	}
	err := gax.Invoke(ctx, func(ctx context.Context) error {
	var err error
	resp, err = c.metricClient.ListTimeSeries(ctx, req)
	return err
	}, c.CallOptions.ListTimeSeries...)
	if err != nil {
	return nil, "", err
	}
	return resp.TimeSeries, 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
	}

	// CreateTimeSeries creates or adds data to one or more time series.
	// The response is empty if all time series in the request were written.
	// If any time series could not be written, a corresponding failure message is
	// included in the error response.
	func (c MetricClient) CreateTimeSeries(ctx context.Context, req monitoringpb.CreateTimeSeriesRequest) error {
	md, _ := metadata.FromContext(ctx)
	ctx = metadata.NewContext(ctx, metadata.Join(md, c.metadata))
	err := gax.Invoke(ctx, func(ctx context.Context) error {
	var err error
	_, err = c.metricClient.CreateTimeSeries(ctx, req)
	return err
	}, c.CallOptions.CreateTimeSeries...)
	return err
	}

	// MetricDescriptorIterator manages a stream of *metricpb.MetricDescriptor.
	type MetricDescriptorIterator struct {
	items []*metricpb.MetricDescriptor
	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 []*metricpb.MetricDescriptor, nextPageToken string, err error)
	}

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

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

	func (it *MetricDescriptorIterator) 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) {
	if err := it.nextFunc(); err != nil {
	return nil, 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
	}

	// TimeSeriesIterator manages a stream of *monitoringpb.TimeSeries.
	type TimeSeriesIterator struct {
	items []*monitoringpb.TimeSeries
	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 []*monitoringpb.TimeSeries, nextPageToken string, err error)
	}

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

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

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