// 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 osconfig

import (
	"context"
	"fmt"
	"math"
	"net/url"
	"time"

	"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"
	osconfigpb "google.golang.org/genproto/googleapis/cloud/osconfig/v1beta"
	"google.golang.org/grpc"
	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/metadata"
)

var newClientHook clientHook

// CallOptions contains the retry settings for each method of Client.
type CallOptions struct {
	ExecutePatchJob             []gax.CallOption
	GetPatchJob                 []gax.CallOption
	CancelPatchJob              []gax.CallOption
	ListPatchJobs               []gax.CallOption
	ListPatchJobInstanceDetails []gax.CallOption
	CreatePatchDeployment       []gax.CallOption
	GetPatchDeployment          []gax.CallOption
	ListPatchDeployments        []gax.CallOption
	DeletePatchDeployment       []gax.CallOption
	CreateGuestPolicy           []gax.CallOption
	GetGuestPolicy              []gax.CallOption
	ListGuestPolicies           []gax.CallOption
	UpdateGuestPolicy           []gax.CallOption
	DeleteGuestPolicy           []gax.CallOption
	LookupEffectiveGuestPolicy  []gax.CallOption
}

func defaultClientOptions() []option.ClientOption {
	return []option.ClientOption{
		option.WithEndpoint("osconfig.googleapis.com:443"),
		option.WithGRPCDialOption(grpc.WithDisableServiceConfig()),
		option.WithScopes(DefaultAuthScopes()...),
		option.WithGRPCDialOption(grpc.WithDefaultCallOptions(
			grpc.MaxCallRecvMsgSize(math.MaxInt32))),
	}
}

func defaultCallOptions() *CallOptions {
	return &CallOptions{
		ExecutePatchJob: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.Unavailable,
				}, gax.Backoff{
					Initial:    1000 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
		GetPatchJob: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.Unavailable,
				}, gax.Backoff{
					Initial:    1000 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
		CancelPatchJob: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.Unavailable,
				}, gax.Backoff{
					Initial:    1000 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
		ListPatchJobs: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.Unavailable,
				}, gax.Backoff{
					Initial:    1000 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
		ListPatchJobInstanceDetails: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.Unavailable,
				}, gax.Backoff{
					Initial:    1000 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
		CreatePatchDeployment: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.Unavailable,
				}, gax.Backoff{
					Initial:    1000 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
		GetPatchDeployment: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.Unavailable,
				}, gax.Backoff{
					Initial:    1000 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
		ListPatchDeployments: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.Unavailable,
				}, gax.Backoff{
					Initial:    1000 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
		DeletePatchDeployment: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.Unavailable,
				}, gax.Backoff{
					Initial:    1000 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
		CreateGuestPolicy: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.Unavailable,
				}, gax.Backoff{
					Initial:    1000 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
		GetGuestPolicy: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.Unavailable,
				}, gax.Backoff{
					Initial:    1000 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
		ListGuestPolicies: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.Unavailable,
				}, gax.Backoff{
					Initial:    1000 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
		UpdateGuestPolicy: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.Unavailable,
				}, gax.Backoff{
					Initial:    1000 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
		DeleteGuestPolicy: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.Unavailable,
				}, gax.Backoff{
					Initial:    1000 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
		LookupEffectiveGuestPolicy: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.Unavailable,
				}, gax.Backoff{
					Initial:    1000 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
	}
}

// Client is a client for interacting with Cloud OS Config API.
//
// Methods, except Close, may be called concurrently. However, fields must not be modified concurrently with method calls.
type Client struct {
	// Connection pool of gRPC connections to the service.
	connPool gtransport.ConnPool

	// The gRPC API client.
	client osconfigpb.OsConfigServiceClient

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

	// The x-goog-* metadata to be sent with each request.
	xGoogMetadata metadata.MD
}

// NewClient creates a new os config service client.
//
// OS Config API
//
// The OS Config service is a server-side component that you can use to
// manage package installations and patch jobs for virtual machine instances.
func NewClient(ctx context.Context, opts ...option.ClientOption) (*Client, error) {
	clientOpts := defaultClientOptions()

	if newClientHook != nil {
		hookOpts, err := newClientHook(ctx, clientHookParams{})
		if err != nil {
			return nil, err
		}
		clientOpts = append(clientOpts, hookOpts...)
	}

	connPool, err := gtransport.DialPool(ctx, append(clientOpts, opts...)...)
	if err != nil {
		return nil, err
	}
	c := &Client{
		connPool:    connPool,
		CallOptions: defaultCallOptions(),

		client: osconfigpb.NewOsConfigServiceClient(connPool),
	}
	c.setGoogleClientInfo()

	return c, nil
}

// Connection returns a connection to the API service.
//
// Deprecated.
func (c *Client) 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 *Client) 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 *Client) 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...))
}

// ExecutePatchJob patch VM instances by creating and running a patch job.
func (c *Client) ExecutePatchJob(ctx context.Context, req *osconfigpb.ExecutePatchJobRequest, opts ...gax.CallOption) (*osconfigpb.PatchJob, 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.ExecutePatchJob[0:len(c.CallOptions.ExecutePatchJob):len(c.CallOptions.ExecutePatchJob)], opts...)
	var resp *osconfigpb.PatchJob
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.client.ExecutePatchJob(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// GetPatchJob get the patch job. This can be used to track the progress of an
// ongoing patch job or review the details of completed jobs.
func (c *Client) GetPatchJob(ctx context.Context, req *osconfigpb.GetPatchJobRequest, opts ...gax.CallOption) (*osconfigpb.PatchJob, 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.GetPatchJob[0:len(c.CallOptions.GetPatchJob):len(c.CallOptions.GetPatchJob)], opts...)
	var resp *osconfigpb.PatchJob
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.client.GetPatchJob(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// CancelPatchJob cancel a patch job. The patch job must be active. Canceled patch jobs
// cannot be restarted.
func (c *Client) CancelPatchJob(ctx context.Context, req *osconfigpb.CancelPatchJobRequest, opts ...gax.CallOption) (*osconfigpb.PatchJob, 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.CancelPatchJob[0:len(c.CallOptions.CancelPatchJob):len(c.CallOptions.CancelPatchJob)], opts...)
	var resp *osconfigpb.PatchJob
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.client.CancelPatchJob(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// ListPatchJobs get a list of patch jobs.
func (c *Client) ListPatchJobs(ctx context.Context, req *osconfigpb.ListPatchJobsRequest, opts ...gax.CallOption) *PatchJobIterator {
	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.ListPatchJobs[0:len(c.CallOptions.ListPatchJobs):len(c.CallOptions.ListPatchJobs)], opts...)
	it := &PatchJobIterator{}
	req = proto.Clone(req).(*osconfigpb.ListPatchJobsRequest)
	it.InternalFetch = func(pageSize int, pageToken string) ([]*osconfigpb.PatchJob, string, error) {
		var resp *osconfigpb.ListPatchJobsResponse
		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.ListPatchJobs(ctx, req, settings.GRPC...)
			return err
		}, opts...)
		if err != nil {
			return nil, "", err
		}

		it.Response = resp
		return resp.PatchJobs, 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
}

// ListPatchJobInstanceDetails get a list of instance details for a given patch job.
func (c *Client) ListPatchJobInstanceDetails(ctx context.Context, req *osconfigpb.ListPatchJobInstanceDetailsRequest, opts ...gax.CallOption) *PatchJobInstanceDetailsIterator {
	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.ListPatchJobInstanceDetails[0:len(c.CallOptions.ListPatchJobInstanceDetails):len(c.CallOptions.ListPatchJobInstanceDetails)], opts...)
	it := &PatchJobInstanceDetailsIterator{}
	req = proto.Clone(req).(*osconfigpb.ListPatchJobInstanceDetailsRequest)
	it.InternalFetch = func(pageSize int, pageToken string) ([]*osconfigpb.PatchJobInstanceDetails, string, error) {
		var resp *osconfigpb.ListPatchJobInstanceDetailsResponse
		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.ListPatchJobInstanceDetails(ctx, req, settings.GRPC...)
			return err
		}, opts...)
		if err != nil {
			return nil, "", err
		}

		it.Response = resp
		return resp.PatchJobInstanceDetails, 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
}

// CreatePatchDeployment create an OS Config patch deployment.
func (c *Client) CreatePatchDeployment(ctx context.Context, req *osconfigpb.CreatePatchDeploymentRequest, opts ...gax.CallOption) (*osconfigpb.PatchDeployment, 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.CreatePatchDeployment[0:len(c.CallOptions.CreatePatchDeployment):len(c.CallOptions.CreatePatchDeployment)], opts...)
	var resp *osconfigpb.PatchDeployment
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.client.CreatePatchDeployment(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// GetPatchDeployment get an OS Config patch deployment.
func (c *Client) GetPatchDeployment(ctx context.Context, req *osconfigpb.GetPatchDeploymentRequest, opts ...gax.CallOption) (*osconfigpb.PatchDeployment, 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.GetPatchDeployment[0:len(c.CallOptions.GetPatchDeployment):len(c.CallOptions.GetPatchDeployment)], opts...)
	var resp *osconfigpb.PatchDeployment
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.client.GetPatchDeployment(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// ListPatchDeployments get a page of OS Config patch deployments.
func (c *Client) ListPatchDeployments(ctx context.Context, req *osconfigpb.ListPatchDeploymentsRequest, opts ...gax.CallOption) *PatchDeploymentIterator {
	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.ListPatchDeployments[0:len(c.CallOptions.ListPatchDeployments):len(c.CallOptions.ListPatchDeployments)], opts...)
	it := &PatchDeploymentIterator{}
	req = proto.Clone(req).(*osconfigpb.ListPatchDeploymentsRequest)
	it.InternalFetch = func(pageSize int, pageToken string) ([]*osconfigpb.PatchDeployment, string, error) {
		var resp *osconfigpb.ListPatchDeploymentsResponse
		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.ListPatchDeployments(ctx, req, settings.GRPC...)
			return err
		}, opts...)
		if err != nil {
			return nil, "", err
		}

		it.Response = resp
		return resp.PatchDeployments, 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
}

// DeletePatchDeployment delete an OS Config patch deployment.
func (c *Client) DeletePatchDeployment(ctx context.Context, req *osconfigpb.DeletePatchDeploymentRequest, opts ...gax.CallOption) 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.DeletePatchDeployment[0:len(c.CallOptions.DeletePatchDeployment):len(c.CallOptions.DeletePatchDeployment)], opts...)
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		_, err = c.client.DeletePatchDeployment(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	return err
}

// CreateGuestPolicy create an OS Config guest policy.
func (c *Client) CreateGuestPolicy(ctx context.Context, req *osconfigpb.CreateGuestPolicyRequest, opts ...gax.CallOption) (*osconfigpb.GuestPolicy, 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.CreateGuestPolicy[0:len(c.CallOptions.CreateGuestPolicy):len(c.CallOptions.CreateGuestPolicy)], opts...)
	var resp *osconfigpb.GuestPolicy
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.client.CreateGuestPolicy(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// GetGuestPolicy get an OS Config guest policy.
func (c *Client) GetGuestPolicy(ctx context.Context, req *osconfigpb.GetGuestPolicyRequest, opts ...gax.CallOption) (*osconfigpb.GuestPolicy, 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.GetGuestPolicy[0:len(c.CallOptions.GetGuestPolicy):len(c.CallOptions.GetGuestPolicy)], opts...)
	var resp *osconfigpb.GuestPolicy
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.client.GetGuestPolicy(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// ListGuestPolicies get a page of OS Config guest policies.
func (c *Client) ListGuestPolicies(ctx context.Context, req *osconfigpb.ListGuestPoliciesRequest, opts ...gax.CallOption) *GuestPolicyIterator {
	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.ListGuestPolicies[0:len(c.CallOptions.ListGuestPolicies):len(c.CallOptions.ListGuestPolicies)], opts...)
	it := &GuestPolicyIterator{}
	req = proto.Clone(req).(*osconfigpb.ListGuestPoliciesRequest)
	it.InternalFetch = func(pageSize int, pageToken string) ([]*osconfigpb.GuestPolicy, string, error) {
		var resp *osconfigpb.ListGuestPoliciesResponse
		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.ListGuestPolicies(ctx, req, settings.GRPC...)
			return err
		}, opts...)
		if err != nil {
			return nil, "", err
		}

		it.Response = resp
		return resp.GuestPolicies, 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
}

// UpdateGuestPolicy update an OS Config guest policy.
func (c *Client) UpdateGuestPolicy(ctx context.Context, req *osconfigpb.UpdateGuestPolicyRequest, opts ...gax.CallOption) (*osconfigpb.GuestPolicy, error) {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "guest_policy.name", url.QueryEscape(req.GetGuestPolicy().GetName())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.UpdateGuestPolicy[0:len(c.CallOptions.UpdateGuestPolicy):len(c.CallOptions.UpdateGuestPolicy)], opts...)
	var resp *osconfigpb.GuestPolicy
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.client.UpdateGuestPolicy(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// DeleteGuestPolicy delete an OS Config guest policy.
func (c *Client) DeleteGuestPolicy(ctx context.Context, req *osconfigpb.DeleteGuestPolicyRequest, opts ...gax.CallOption) 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.DeleteGuestPolicy[0:len(c.CallOptions.DeleteGuestPolicy):len(c.CallOptions.DeleteGuestPolicy)], opts...)
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		_, err = c.client.DeleteGuestPolicy(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	return err
}

// LookupEffectiveGuestPolicy lookup the effective guest policy that applies to a VM instance. This
// lookup merges all policies that are assigned to the instance ancestry.
func (c *Client) LookupEffectiveGuestPolicy(ctx context.Context, req *osconfigpb.LookupEffectiveGuestPolicyRequest, opts ...gax.CallOption) (*osconfigpb.EffectiveGuestPolicy, error) {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "instance", url.QueryEscape(req.GetInstance())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.LookupEffectiveGuestPolicy[0:len(c.CallOptions.LookupEffectiveGuestPolicy):len(c.CallOptions.LookupEffectiveGuestPolicy)], opts...)
	var resp *osconfigpb.EffectiveGuestPolicy
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.client.LookupEffectiveGuestPolicy(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// GuestPolicyIterator manages a stream of *osconfigpb.GuestPolicy.
type GuestPolicyIterator struct {
	items    []*osconfigpb.GuestPolicy
	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 []*osconfigpb.GuestPolicy, nextPageToken string, err error)
}

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

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

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

// PatchDeploymentIterator manages a stream of *osconfigpb.PatchDeployment.
type PatchDeploymentIterator struct {
	items    []*osconfigpb.PatchDeployment
	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 []*osconfigpb.PatchDeployment, nextPageToken string, err error)
}

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

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

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

// PatchJobInstanceDetailsIterator manages a stream of *osconfigpb.PatchJobInstanceDetails.
type PatchJobInstanceDetailsIterator struct {
	items    []*osconfigpb.PatchJobInstanceDetails
	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 []*osconfigpb.PatchJobInstanceDetails, nextPageToken string, err error)
}

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

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

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

// PatchJobIterator manages a stream of *osconfigpb.PatchJob.
type PatchJobIterator struct {
	items    []*osconfigpb.PatchJob
	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 []*osconfigpb.PatchJob, nextPageToken string, err error)
}

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

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

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