// Copyright 2019 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 gapic-generator. DO NOT EDIT.

package admin

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

	"cloud.google.com/go/iam/admin/apiv1/adminpb"
	"cloud.google.com/go/iam/apiv1/iampb"
	gax "github.com/googleapis/gax-go/v2"
	"google.golang.org/api/iterator"
	"google.golang.org/api/option"
	gtransport "google.golang.org/api/transport/grpc"
	"google.golang.org/grpc"
	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/metadata"
	"google.golang.org/protobuf/proto"
)

// IamCallOptions contains the retry settings for each method of IamClient.
type IamCallOptions struct {
	ListServiceAccounts      []gax.CallOption
	GetServiceAccount        []gax.CallOption
	CreateServiceAccount     []gax.CallOption
	UpdateServiceAccount     []gax.CallOption
	DeleteServiceAccount     []gax.CallOption
	ListServiceAccountKeys   []gax.CallOption
	GetServiceAccountKey     []gax.CallOption
	CreateServiceAccountKey  []gax.CallOption
	DeleteServiceAccountKey  []gax.CallOption
	SignBlob                 []gax.CallOption
	GetIamPolicy             []gax.CallOption
	SetIamPolicy             []gax.CallOption
	TestIamPermissions       []gax.CallOption
	QueryGrantableRoles      []gax.CallOption
	SignJwt                  []gax.CallOption
	ListRoles                []gax.CallOption
	GetRole                  []gax.CallOption
	CreateRole               []gax.CallOption
	UpdateRole               []gax.CallOption
	DeleteRole               []gax.CallOption
	UndeleteRole             []gax.CallOption
	QueryTestablePermissions []gax.CallOption
}

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

func defaultIamCallOptions() *IamCallOptions {
	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 &IamCallOptions{
		ListServiceAccounts:      retry[[2]string{"default", "idempotent"}],
		GetServiceAccount:        retry[[2]string{"default", "idempotent"}],
		CreateServiceAccount:     retry[[2]string{"default", "non_idempotent"}],
		UpdateServiceAccount:     retry[[2]string{"default", "idempotent"}],
		DeleteServiceAccount:     retry[[2]string{"default", "idempotent"}],
		ListServiceAccountKeys:   retry[[2]string{"default", "idempotent"}],
		GetServiceAccountKey:     retry[[2]string{"default", "idempotent"}],
		CreateServiceAccountKey:  retry[[2]string{"default", "non_idempotent"}],
		DeleteServiceAccountKey:  retry[[2]string{"default", "idempotent"}],
		SignBlob:                 retry[[2]string{"default", "non_idempotent"}],
		GetIamPolicy:             retry[[2]string{"default", "non_idempotent"}],
		SetIamPolicy:             retry[[2]string{"default", "non_idempotent"}],
		TestIamPermissions:       retry[[2]string{"default", "non_idempotent"}],
		QueryGrantableRoles:      retry[[2]string{"default", "non_idempotent"}],
		SignJwt:                  retry[[2]string{"default", "non_idempotent"}],
		ListRoles:                retry[[2]string{"default", "idempotent"}],
		GetRole:                  retry[[2]string{"default", "idempotent"}],
		CreateRole:               retry[[2]string{"default", "non_idempotent"}],
		UpdateRole:               retry[[2]string{"default", "non_idempotent"}],
		DeleteRole:               retry[[2]string{"default", "non_idempotent"}],
		UndeleteRole:             retry[[2]string{"default", "non_idempotent"}],
		QueryTestablePermissions: retry[[2]string{"default", "non_idempotent"}],
	}
}

// IamClient is a client for interacting with Google Identity and Access Management (IAM) API.
//
// Methods, except Close, may be called concurrently. However, fields must not be modified concurrently with method calls.
type IamClient struct {
	// The connection to the service.
	connPool gtransport.ConnPool

	// The gRPC API client.
	iamClient adminpb.IAMClient

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

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

// NewIamClient creates a new iam client.
//
// Creates and manages service account objects.
//
// Service account is an account that belongs to your project instead
// of to an individual end user. It is used to authenticate calls
// to a Google API.
//
// To create a service account, specify the project_id and account_id
// for the account.  The account_id is unique within the project, and used
// to generate the service account email address and a stable
// unique_id.
//
// All other methods can identify accounts using the format
// projects/{PROJECT_ID}/serviceAccounts/{SERVICE_ACCOUNT_EMAIL}.
// Using - as a wildcard for the project will infer the project from
// the account. The account value can be the email address or the
// unique_id of the service account.
func NewIamClient(ctx context.Context, opts ...option.ClientOption) (*IamClient, error) {
	connPool, err := gtransport.DialPool(ctx, append(defaultIamClientOptions(), opts...)...)
	if err != nil {
		return nil, err
	}
	c := &IamClient{
		connPool:    connPool,
		CallOptions: defaultIamCallOptions(),

		iamClient: adminpb.NewIAMClient(connPool),
	}
	c.setGoogleClientInfo()
	return c, nil
}

// Connection returns the client's connection to the API service.
func (c *IamClient) 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 *IamClient) 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 *IamClient) setGoogleClientInfo(keyval ...string) {
	kv := append([]string{"gl-go", gax.GoVersion}, keyval...)
	kv = append(kv, "gapic", versionClient, "gax", gax.Version, "grpc", grpc.Version)
	c.xGoogMetadata = metadata.Pairs("x-goog-api-client", gax.XGoogHeader(kv...))
}

// ListServiceAccounts lists [ServiceAccounts][google.iam.admin.v1.ServiceAccount] for a project.
func (c *IamClient) ListServiceAccounts(ctx context.Context, req *adminpb.ListServiceAccountsRequest, opts ...gax.CallOption) *ServiceAccountIterator {
	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.ListServiceAccounts[0:len(c.CallOptions.ListServiceAccounts):len(c.CallOptions.ListServiceAccounts)], opts...)
	it := &ServiceAccountIterator{}
	req = proto.Clone(req).(*adminpb.ListServiceAccountsRequest)
	it.InternalFetch = func(pageSize int, pageToken string) ([]*adminpb.ServiceAccount, string, error) {
		var resp *adminpb.ListServiceAccountsResponse
		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.iamClient.ListServiceAccounts(ctx, req, settings.GRPC...)
			return err
		}, opts...)
		if err != nil {
			return nil, "", err
		}
		return resp.Accounts, 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
}

// GetServiceAccount gets a [ServiceAccount][google.iam.admin.v1.ServiceAccount].
func (c *IamClient) GetServiceAccount(ctx context.Context, req *adminpb.GetServiceAccountRequest, opts ...gax.CallOption) (*adminpb.ServiceAccount, 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.GetServiceAccount[0:len(c.CallOptions.GetServiceAccount):len(c.CallOptions.GetServiceAccount)], opts...)
	var resp *adminpb.ServiceAccount
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.iamClient.GetServiceAccount(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// CreateServiceAccount creates a [ServiceAccount][google.iam.admin.v1.ServiceAccount]
// and returns it.
func (c *IamClient) CreateServiceAccount(ctx context.Context, req *adminpb.CreateServiceAccountRequest, opts ...gax.CallOption) (*adminpb.ServiceAccount, 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.CreateServiceAccount[0:len(c.CallOptions.CreateServiceAccount):len(c.CallOptions.CreateServiceAccount)], opts...)
	var resp *adminpb.ServiceAccount
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.iamClient.CreateServiceAccount(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// UpdateServiceAccount updates a [ServiceAccount][google.iam.admin.v1.ServiceAccount].
//
// Currently, only the following fields are updatable:
// display_name .
// The etag is mandatory.
func (c *IamClient) UpdateServiceAccount(ctx context.Context, req *adminpb.ServiceAccount, opts ...gax.CallOption) (*adminpb.ServiceAccount, 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.UpdateServiceAccount[0:len(c.CallOptions.UpdateServiceAccount):len(c.CallOptions.UpdateServiceAccount)], opts...)
	var resp *adminpb.ServiceAccount
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.iamClient.UpdateServiceAccount(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// DeleteServiceAccount deletes a [ServiceAccount][google.iam.admin.v1.ServiceAccount].
func (c *IamClient) DeleteServiceAccount(ctx context.Context, req *adminpb.DeleteServiceAccountRequest, 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.DeleteServiceAccount[0:len(c.CallOptions.DeleteServiceAccount):len(c.CallOptions.DeleteServiceAccount)], opts...)
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		_, err = c.iamClient.DeleteServiceAccount(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	return err
}

// ListServiceAccountKeys lists [ServiceAccountKeys][google.iam.admin.v1.ServiceAccountKey].
func (c *IamClient) ListServiceAccountKeys(ctx context.Context, req *adminpb.ListServiceAccountKeysRequest, opts ...gax.CallOption) (*adminpb.ListServiceAccountKeysResponse, 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.ListServiceAccountKeys[0:len(c.CallOptions.ListServiceAccountKeys):len(c.CallOptions.ListServiceAccountKeys)], opts...)
	var resp *adminpb.ListServiceAccountKeysResponse
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.iamClient.ListServiceAccountKeys(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// GetServiceAccountKey gets the [ServiceAccountKey][google.iam.admin.v1.ServiceAccountKey]
// by key id.
func (c *IamClient) GetServiceAccountKey(ctx context.Context, req *adminpb.GetServiceAccountKeyRequest, opts ...gax.CallOption) (*adminpb.ServiceAccountKey, 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.GetServiceAccountKey[0:len(c.CallOptions.GetServiceAccountKey):len(c.CallOptions.GetServiceAccountKey)], opts...)
	var resp *adminpb.ServiceAccountKey
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.iamClient.GetServiceAccountKey(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// CreateServiceAccountKey creates a [ServiceAccountKey][google.iam.admin.v1.ServiceAccountKey]
// and returns it.
func (c *IamClient) CreateServiceAccountKey(ctx context.Context, req *adminpb.CreateServiceAccountKeyRequest, opts ...gax.CallOption) (*adminpb.ServiceAccountKey, 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.CreateServiceAccountKey[0:len(c.CallOptions.CreateServiceAccountKey):len(c.CallOptions.CreateServiceAccountKey)], opts...)
	var resp *adminpb.ServiceAccountKey
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.iamClient.CreateServiceAccountKey(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// DeleteServiceAccountKey deletes a [ServiceAccountKey][google.iam.admin.v1.ServiceAccountKey].
func (c *IamClient) DeleteServiceAccountKey(ctx context.Context, req *adminpb.DeleteServiceAccountKeyRequest, 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.DeleteServiceAccountKey[0:len(c.CallOptions.DeleteServiceAccountKey):len(c.CallOptions.DeleteServiceAccountKey)], opts...)
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		_, err = c.iamClient.DeleteServiceAccountKey(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	return err
}

// SignBlob signs a blob using a service account's system-managed private key.
func (c *IamClient) SignBlob(ctx context.Context, req *adminpb.SignBlobRequest, opts ...gax.CallOption) (*adminpb.SignBlobResponse, 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.SignBlob[0:len(c.CallOptions.SignBlob):len(c.CallOptions.SignBlob)], opts...)
	var resp *adminpb.SignBlobResponse
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.iamClient.SignBlob(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// getIamPolicy returns the IAM access control policy for a
// [ServiceAccount][google.iam.admin.v1.ServiceAccount].
func (c *IamClient) getIamPolicy(ctx context.Context, req *iampb.GetIamPolicyRequest, opts ...gax.CallOption) (*iampb.Policy, error) {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "resource", url.QueryEscape(req.GetResource())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.GetIamPolicy[0:len(c.CallOptions.GetIamPolicy):len(c.CallOptions.GetIamPolicy)], opts...)
	var resp *iampb.Policy
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.iamClient.GetIamPolicy(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// setIamPolicy sets the IAM access control policy for a
// [ServiceAccount][google.iam.admin.v1.ServiceAccount].
func (c *IamClient) setIamPolicy(ctx context.Context, req *iampb.SetIamPolicyRequest, opts ...gax.CallOption) (*iampb.Policy, error) {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "resource", url.QueryEscape(req.GetResource())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.SetIamPolicy[0:len(c.CallOptions.SetIamPolicy):len(c.CallOptions.SetIamPolicy)], opts...)
	var resp *iampb.Policy
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.iamClient.SetIamPolicy(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// TestIamPermissions tests the specified permissions against the IAM access control policy
// for a [ServiceAccount][google.iam.admin.v1.ServiceAccount].
func (c *IamClient) TestIamPermissions(ctx context.Context, req *iampb.TestIamPermissionsRequest, opts ...gax.CallOption) (*iampb.TestIamPermissionsResponse, error) {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "resource", url.QueryEscape(req.GetResource())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.TestIamPermissions[0:len(c.CallOptions.TestIamPermissions):len(c.CallOptions.TestIamPermissions)], opts...)
	var resp *iampb.TestIamPermissionsResponse
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.iamClient.TestIamPermissions(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// QueryGrantableRoles queries roles that can be granted on a particular resource.
// A role is grantable if it can be used as the role in a binding for a policy
// for that resource.
func (c *IamClient) QueryGrantableRoles(ctx context.Context, req *adminpb.QueryGrantableRolesRequest, opts ...gax.CallOption) (*adminpb.QueryGrantableRolesResponse, error) {
	ctx = insertMetadata(ctx, c.xGoogMetadata)
	opts = append(c.CallOptions.QueryGrantableRoles[0:len(c.CallOptions.QueryGrantableRoles):len(c.CallOptions.QueryGrantableRoles)], opts...)
	var resp *adminpb.QueryGrantableRolesResponse
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.iamClient.QueryGrantableRoles(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// SignJwt signs a JWT using a service account's system-managed private key.
//
// If no expiry time (exp) is provided in the SignJwtRequest, IAM sets an
// an expiry time of one hour by default. If you request an expiry time of
// more than one hour, the request will fail.
func (c *IamClient) SignJwt(ctx context.Context, req *adminpb.SignJwtRequest, opts ...gax.CallOption) (*adminpb.SignJwtResponse, 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.SignJwt[0:len(c.CallOptions.SignJwt):len(c.CallOptions.SignJwt)], opts...)
	var resp *adminpb.SignJwtResponse
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.iamClient.SignJwt(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// ListRoles lists the Roles defined on a resource.
func (c *IamClient) ListRoles(ctx context.Context, req *adminpb.ListRolesRequest, opts ...gax.CallOption) (*adminpb.ListRolesResponse, error) {
	ctx = insertMetadata(ctx, c.xGoogMetadata)
	opts = append(c.CallOptions.ListRoles[0:len(c.CallOptions.ListRoles):len(c.CallOptions.ListRoles)], opts...)
	var resp *adminpb.ListRolesResponse
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.iamClient.ListRoles(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// GetRole gets a Role definition.
func (c *IamClient) GetRole(ctx context.Context, req *adminpb.GetRoleRequest, opts ...gax.CallOption) (*adminpb.Role, 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.GetRole[0:len(c.CallOptions.GetRole):len(c.CallOptions.GetRole)], opts...)
	var resp *adminpb.Role
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.iamClient.GetRole(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// CreateRole creates a new Role.
func (c *IamClient) CreateRole(ctx context.Context, req *adminpb.CreateRoleRequest, opts ...gax.CallOption) (*adminpb.Role, 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.CreateRole[0:len(c.CallOptions.CreateRole):len(c.CallOptions.CreateRole)], opts...)
	var resp *adminpb.Role
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.iamClient.CreateRole(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// UpdateRole updates a Role definition.
func (c *IamClient) UpdateRole(ctx context.Context, req *adminpb.UpdateRoleRequest, opts ...gax.CallOption) (*adminpb.Role, 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.UpdateRole[0:len(c.CallOptions.UpdateRole):len(c.CallOptions.UpdateRole)], opts...)
	var resp *adminpb.Role
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.iamClient.UpdateRole(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// DeleteRole soft deletes a role. The role is suspended and cannot be used to create new
// IAM Policy Bindings.
// The Role will not be included in ListRoles() unless show_deleted is set
// in the ListRolesRequest. The Role contains the deleted boolean set.
// Existing Bindings remains, but are inactive. The Role can be undeleted
// within 7 days. After 7 days the Role is deleted and all Bindings associated
// with the role are removed.
func (c *IamClient) DeleteRole(ctx context.Context, req *adminpb.DeleteRoleRequest, opts ...gax.CallOption) (*adminpb.Role, 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.DeleteRole[0:len(c.CallOptions.DeleteRole):len(c.CallOptions.DeleteRole)], opts...)
	var resp *adminpb.Role
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.iamClient.DeleteRole(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// UndeleteRole undelete a Role, bringing it back in its previous state.
func (c *IamClient) UndeleteRole(ctx context.Context, req *adminpb.UndeleteRoleRequest, opts ...gax.CallOption) (*adminpb.Role, 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.UndeleteRole[0:len(c.CallOptions.UndeleteRole):len(c.CallOptions.UndeleteRole)], opts...)
	var resp *adminpb.Role
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.iamClient.UndeleteRole(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// QueryTestablePermissions lists the permissions testable on a resource.
// A permission is testable if it can be tested for an identity on a resource.
func (c *IamClient) QueryTestablePermissions(ctx context.Context, req *adminpb.QueryTestablePermissionsRequest, opts ...gax.CallOption) (*adminpb.QueryTestablePermissionsResponse, error) {
	ctx = insertMetadata(ctx, c.xGoogMetadata)
	opts = append(c.CallOptions.QueryTestablePermissions[0:len(c.CallOptions.QueryTestablePermissions):len(c.CallOptions.QueryTestablePermissions)], opts...)
	var resp *adminpb.QueryTestablePermissionsResponse
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.iamClient.QueryTestablePermissions(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// ServiceAccountIterator manages a stream of *adminpb.ServiceAccount.
type ServiceAccountIterator struct {
	items    []*adminpb.ServiceAccount
	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 []*adminpb.ServiceAccount, nextPageToken string, err error)
}

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

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

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