request

package
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 Go to latest Published: Jun 6, 2018 License: Apache-2.0 Imports: 17 Imported by: 0

Documentation

Index

Constants

View Source 
const (
	// ErrCodeSerialization is the serialization error code that is received
	// during protocol unmarshaling.
	ErrCodeSerialization = "SerializationError"

	// ErrCodeRead is an error that is returned during HTTP reads.
	ErrCodeRead = "ReadError"

	// ErrCodeResponseTimeout is the connection timeout error that is received
	// during body reads.
	ErrCodeResponseTimeout = "ResponseTimeout"

	// CanceledErrorCode is the error code that will be returned by an
	// API request that was canceled. Requests given a aws.Context may
	// return this error when canceled.
	CanceledErrorCode = "RequestCanceled"
)
View Source 
const (
	// InvalidParameterErrCode is the error code for invalid parameters errors
	InvalidParameterErrCode = "InvalidParameter"
	// ParamRequiredErrCode is the error code for required parameter errors
	ParamRequiredErrCode = "ParamRequiredError"
	// ParamMinValueErrCode is the error code for fields with too low of a
	// number value.
	ParamMinValueErrCode = "ParamMinValueError"
	// ParamMinLenErrCode is the error code for fields without enough elements.
	ParamMinLenErrCode = "ParamMinLenError"
)
View Source 
const (
	// HandlerResponseTimeout is what we use to signify the name of the
	// response timeout handler.
	HandlerResponseTimeout = "ResponseTimeoutHandler"
)
View Source 
const WaiterResourceNotReadyErrorCode = "ResourceNotReady"

WaiterResourceNotReadyErrorCode is the error code returned by a waiter when the waiter's max attempts have been exhausted.

Variables

View Source 
var NoBody = http.NoBody

NoBody is a http.NoBody reader instructing Go HTTP client to not include and body in the HTTP request.

Functions

func AddToUserAgent 

func AddToUserAgent(r *Request, s string)

AddToUserAgent adds the string to the end of the request's current user agent.

func HandlerListLogItem 

func HandlerListLogItem(item HandlerListRunItem) bool

HandlerListLogItem logs the request handler and the state of the request's Error value. Always returns true to continue iterating request handlers in a HandlerList.

func HandlerListStopOnError 

func HandlerListStopOnError(item HandlerListRunItem) bool

HandlerListStopOnError returns false to stop the HandlerList iterating over request handlers if Request.Error is not nil. True otherwise to continue iterating.

func IsErrorExpiredCreds 

func IsErrorExpiredCreds(err error) bool

IsErrorExpiredCreds returns whether the error code is a credential expiry error. Returns false if error is nil.

func IsErrorRetryable 

func IsErrorRetryable(err error) bool

IsErrorRetryable returns whether the error is retryable, based on its Code. Returns false if error is nil.

func IsErrorThrottle 

func IsErrorThrottle(err error) bool

IsErrorThrottle returns whether the error is to be throttled based on its code. Returns false if error is nil.

func MakeAddToUserAgentFreeFormHandler 

func MakeAddToUserAgentFreeFormHandler(s string) func(*Request)

MakeAddToUserAgentFreeFormHandler adds the input to the User-Agent request header. The input string will be concatenated with the current request's user agent string.

func MakeAddToUserAgentHandler 

func MakeAddToUserAgentHandler(name, version string, extra ...string) func(*Request)

MakeAddToUserAgentHandler will add the name/version pair to the User-Agent request header. If the extra parameters are provided they will be added as metadata to the name/version pair resulting in the following format. "name/version (extra0; extra1; ...)" The user agent part will be concatenated with this current request's user agent string.

func WithRetryer 

func WithRetryer(cfg *aws.Config, retryer Retryer) *aws.Config

WithRetryer sets a config Retryer value to the given Config returning it for chaining.

Types

type ErrInvalidParam 

type ErrInvalidParam interface {
	awserr.Error

	// Field name the error occurred on.
	Field() string

	// SetContext updates the context of the error.
	SetContext(string)

	// AddNestedContext updates the error's context to include a nested level.
	AddNestedContext(string)
}

An ErrInvalidParam represents an invalid parameter error type.

type ErrInvalidParams 

type ErrInvalidParams struct {
	// Context is the base context of the invalid parameter group.
	Context string
	// contains filtered or unexported fields
}

An ErrInvalidParams provides wrapping of invalid parameter errors found when validating API operation input parameters.

func (*ErrInvalidParams) Add 

func (e *ErrInvalidParams) Add(err ErrInvalidParam)

Add adds a new invalid parameter error to the collection of invalid parameters. The context of the invalid parameter will be updated to reflect this collection.

func (*ErrInvalidParams) AddNested 

func (e *ErrInvalidParams) AddNested(nestedCtx string, nested ErrInvalidParams)

AddNested adds the invalid parameter errors from another ErrInvalidParams value into this collection. The nested errors will have their nested context updated and base context to reflect the merging.

Use for nested validations errors.

func (ErrInvalidParams) Code 

func (e ErrInvalidParams) Code() string

Code returns the code of the error

func (ErrInvalidParams) Error 

func (e ErrInvalidParams) Error() string

Error returns the string formatted form of the invalid parameters.

func (ErrInvalidParams) Len 

func (e ErrInvalidParams) Len() int

Len returns the number of invalid parameter errors

func (ErrInvalidParams) Message 

func (e ErrInvalidParams) Message() string

Message returns the message of the error

func (ErrInvalidParams) OrigErr 

func (e ErrInvalidParams) OrigErr() error

OrigErr returns the invalid parameters as a awserr.BatchedErrors value

func (ErrInvalidParams) OrigErrs 

func (e ErrInvalidParams) OrigErrs() []error

OrigErrs returns a slice of the invalid parameters

type ErrParamMinLen 

type ErrParamMinLen struct {
	// contains filtered or unexported fields
}

An ErrParamMinLen represents a minimum length parameter error.

func NewErrParamMinLen 

func NewErrParamMinLen(field string, min int) *ErrParamMinLen

NewErrParamMinLen creates a new minimum length parameter error.

func (*ErrParamMinLen) AddNestedContext 

func (e *ErrParamMinLen) AddNestedContext(ctx string)

AddNestedContext prepends a context to the field's path.

func (*ErrParamMinLen) Code 

func (e *ErrParamMinLen) Code() string

Code returns the error code for the type of invalid parameter.

func (*ErrParamMinLen) Error 

func (e *ErrParamMinLen) Error() string

Error returns the string version of the invalid parameter error.

func (*ErrParamMinLen) Field 

func (e *ErrParamMinLen) Field() string

Field Returns the field and context the error occurred.

func (*ErrParamMinLen) Message 

func (e *ErrParamMinLen) Message() string

Message returns the reason the parameter was invalid, and its context.

func (*ErrParamMinLen) MinLen 

func (e *ErrParamMinLen) MinLen() int

MinLen returns the field's required minimum length.

func (*ErrParamMinLen) OrigErr 

func (e *ErrParamMinLen) OrigErr() error

OrigErr returns nil, Implemented for awserr.Error interface.

func (*ErrParamMinLen) SetContext 

func (e *ErrParamMinLen) SetContext(ctx string)

SetContext updates the base context of the error.

type ErrParamMinValue 

type ErrParamMinValue struct {
	// contains filtered or unexported fields
}

An ErrParamMinValue represents a minimum value parameter error.

func NewErrParamMinValue 

func NewErrParamMinValue(field string, min float64) *ErrParamMinValue

NewErrParamMinValue creates a new minimum value parameter error.

func (*ErrParamMinValue) AddNestedContext 

func (e *ErrParamMinValue) AddNestedContext(ctx string)

AddNestedContext prepends a context to the field's path.

func (*ErrParamMinValue) Code 

func (e *ErrParamMinValue) Code() string

Code returns the error code for the type of invalid parameter.

func (*ErrParamMinValue) Error 

func (e *ErrParamMinValue) Error() string

Error returns the string version of the invalid parameter error.

func (*ErrParamMinValue) Field 

func (e *ErrParamMinValue) Field() string

Field Returns the field and context the error occurred.

func (*ErrParamMinValue) Message 

func (e *ErrParamMinValue) Message() string

Message returns the reason the parameter was invalid, and its context.

func (*ErrParamMinValue) MinValue 

func (e *ErrParamMinValue) MinValue() float64

MinValue returns the field's require minimum value.

float64 is returned for both int and float min values.

func (*ErrParamMinValue) OrigErr 

func (e *ErrParamMinValue) OrigErr() error

OrigErr returns nil, Implemented for awserr.Error interface.

func (*ErrParamMinValue) SetContext 

func (e *ErrParamMinValue) SetContext(ctx string)

SetContext updates the base context of the error.

type ErrParamRequired 

type ErrParamRequired struct {
	// contains filtered or unexported fields
}

An ErrParamRequired represents an required parameter error.

func NewErrParamRequired 

func NewErrParamRequired(field string) *ErrParamRequired

NewErrParamRequired creates a new required parameter error.

func (*ErrParamRequired) AddNestedContext 

func (e *ErrParamRequired) AddNestedContext(ctx string)

AddNestedContext prepends a context to the field's path.

func (*ErrParamRequired) Code 

func (e *ErrParamRequired) Code() string

Code returns the error code for the type of invalid parameter.

func (*ErrParamRequired) Error 

func (e *ErrParamRequired) Error() string

Error returns the string version of the invalid parameter error.

func (*ErrParamRequired) Field 

func (e *ErrParamRequired) Field() string

Field Returns the field and context the error occurred.

func (*ErrParamRequired) Message 

func (e *ErrParamRequired) Message() string

Message returns the reason the parameter was invalid, and its context.

func (*ErrParamRequired) OrigErr 

func (e *ErrParamRequired) OrigErr() error

OrigErr returns nil, Implemented for awserr.Error interface.

func (*ErrParamRequired) SetContext 

func (e *ErrParamRequired) SetContext(ctx string)

SetContext updates the base context of the error.

type HandlerList 

type HandlerList struct {

	// Called after each request handler in the list is called. If set
	// and the func returns true the HandlerList will continue to iterate
	// over the request handlers. If false is returned the HandlerList
	// will stop iterating.
	//
	// Should be used if extra logic to be performed between each handler
	// in the list. This can be used to terminate a list's iteration
	// based on a condition such as error like, HandlerListStopOnError.
	// Or for logging like HandlerListLogItem.
	AfterEachFn func(item HandlerListRunItem) bool
	// contains filtered or unexported fields
}

A HandlerList manages zero or more handlers in a list.

func (*HandlerList) Clear 

func (l *HandlerList) Clear()

Clear clears the handler list.

func (*HandlerList) Len 

func (l *HandlerList) Len() int

Len returns the number of handlers in the list.

func (*HandlerList) PushBack 

func (l *HandlerList) PushBack(f func(*Request))

PushBack pushes handler f to the back of the handler list.

func (*HandlerList) PushBackNamed 

func (l *HandlerList) PushBackNamed(n NamedHandler)

PushBackNamed pushes named handler f to the back of the handler list.

func (*HandlerList) PushFront 

func (l *HandlerList) PushFront(f func(*Request))

PushFront pushes handler f to the front of the handler list.

func (*HandlerList) PushFrontNamed 

func (l *HandlerList) PushFrontNamed(n NamedHandler)

PushFrontNamed pushes named handler f to the front of the handler list.

func (*HandlerList) Remove 

func (l *HandlerList) Remove(n NamedHandler)

Remove removes a NamedHandler n

func (*HandlerList) RemoveByName 

func (l *HandlerList) RemoveByName(name string)

RemoveByName removes a NamedHandler by name.

func (*HandlerList) Run 

func (l *HandlerList) Run(r *Request)

Run executes all handlers in the list with a given request object.

func (*HandlerList) SetBackNamed 

func (l *HandlerList) SetBackNamed(n NamedHandler)

SetBackNamed will replace the named handler if it exists in the handler list. If the handler does not exist the handler will be added to the end of the list.

func (*HandlerList) SetFrontNamed 

func (l *HandlerList) SetFrontNamed(n NamedHandler)

SetFrontNamed will replace the named handler if it exists in the handler list. If the handler does not exist the handler will be added to the beginning of the list.

func (*HandlerList) SwapNamed 

func (l *HandlerList) SwapNamed(n NamedHandler) (swapped bool)

SwapNamed will swap out any existing handlers with the same name as the passed in NamedHandler returning true if handlers were swapped. False is returned otherwise.

type HandlerListRunItem 

type HandlerListRunItem struct {
	Index   int
	Handler NamedHandler
	Request *Request
}

A HandlerListRunItem represents an entry in the HandlerList which is being run.

type Handlers 

type Handlers struct {
	Validate         HandlerList
	Build            HandlerList
	Sign             HandlerList
	Send             HandlerList
	ValidateResponse HandlerList
	Unmarshal        HandlerList
	UnmarshalMeta    HandlerList
	UnmarshalError   HandlerList
	Retry            HandlerList
	AfterRetry       HandlerList
	Complete         HandlerList
}

A Handlers provides a collection of request handlers for various stages of handling requests.

func (*Handlers) Clear 

func (h *Handlers) Clear()

Clear removes callback functions for all handlers

func (*Handlers) Copy 

func (h *Handlers) Copy() Handlers

Copy returns of this handler's lists.

type NamedHandler 

type NamedHandler struct {
	Name string
	Fn   func(*Request)
}

A NamedHandler is a struct that contains a name and function callback.

type Operation 

type Operation struct {
	Name       string
	HTTPMethod string
	HTTPPath   string
	*Paginator

	BeforePresignFn func(r *Request) error
}

An Operation is the service API operation to be made.

type Option 

type Option func(*Request)

A Option is a functional option that can augment or modify a request when using a WithContext API operation method.

func WithAppendUserAgent 

func WithAppendUserAgent(s string) Option

WithAppendUserAgent will add a string to the user agent prefixed with a single white space.

func WithGetResponseHeader 

func WithGetResponseHeader(key string, val *string) Option

WithGetResponseHeader builds a request Option which will retrieve a single header value from the HTTP Response. If there are multiple values for the header key use WithGetResponseHeaders instead to access the http.Header map directly. The passed in val pointer must be non-nil.

This Option can be used multiple times with a single API operation. 

var id2, versionID string
svc.PutObjectWithContext(ctx, params,
    request.WithGetResponseHeader("x-amz-id-2", &id2),
    request.WithGetResponseHeader("x-amz-version-id", &versionID),
)

func WithGetResponseHeaders 

func WithGetResponseHeaders(headers *http.Header) Option

WithGetResponseHeaders builds a request Option which will retrieve the headers from the HTTP response and assign them to the passed in headers variable. The passed in headers pointer must be non-nil. 

var headers http.Header
svc.PutObjectWithContext(ctx, params, request.WithGetResponseHeaders(&headers))

func WithLogLevel 

func WithLogLevel(l aws.LogLevelType) Option

WithLogLevel is a request option that will set the request to use a specific log level when the request is made. 

svc.PutObjectWithContext(ctx, params, request.WithLogLevel(aws.LogDebugWithHTTPBody)

func WithResponseReadTimeout 

func WithResponseReadTimeout(duration time.Duration) Option

WithResponseReadTimeout is a request option that will wrap the body in a timeout read closer. This will allow for per read timeouts. If a timeout occurred, we will return the ErrCodeResponseTimeout. 

svc.PutObjectWithContext(ctx, params, request.WithTimeoutReadCloser(30 * time.Second)

type Pagination 

type Pagination struct {
	// Function to return a Request value for each pagination request.
	// Any configuration or handlers that need to be applied to the request
	// prior to getting the next page should be done here before the request
	// returned.
	//
	// NewRequest should always be built from the same API operations. It is
	// undefined if different API operations are returned on subsequent calls.
	NewRequest func() (*Request, error)
	// contains filtered or unexported fields
}

A Pagination provides paginating of SDK API operations which are paginatable. Generally you should not use this type directly, but use the "Pages" API operations method to automatically perform pagination for you. Such as, "S3.ListObjectsPages", and "S3.ListObjectsPagesWithContext" methods.

Pagination differs from a Paginator type in that pagination is the type that does the pagination between API operations, and Paginator defines the configuration that will be used per page request. 

cont := true
for p.Next() && cont {
    data := p.Page().(*s3.ListObjectsOutput)
    // process the page's data
}
return p.Err()

See service client API operation Pages methods for examples how the SDK will use the Pagination type.

func (*Pagination) Err 

func (p *Pagination) Err() error

Err returns the error Pagination encountered when retrieving the next page.

func (*Pagination) HasNextPage 

func (p *Pagination) HasNextPage() bool

HasNextPage will return true if Pagination is able to determine that the API operation has additional pages. False will be returned if there are no more pages remaining.

Will always return true if Next has not been called yet.

func (*Pagination) Next 

func (p *Pagination) Next() bool

Next will attempt to retrieve the next page for the API operation. When a page is retrieved true will be returned. If the page cannot be retrieved, or there are no more pages false will be returned.

Use the Page method to retrieve the current page data. The data will need to be cast to the API operation's output type.

Use the Err method to determine if an error occurred if Page returns false.

func (*Pagination) Page 

func (p *Pagination) Page() interface{}

Page returns the current page. Page should only be called after a successful call to Next. It is undefined what Page will return if Page is called after Next returns false.

type Paginator 

type Paginator struct {
	InputTokens     []string
	OutputTokens    []string
	LimitToken      string
	TruncationToken string
}

A Paginator is the configuration data that defines how an API operation should be paginated. This type is used by the API service models to define the generated pagination config for service APIs.

The Pagination type is what provides iterating between pages of an API. It is only used to store the token metadata the SDK should use for performing pagination.

type Request 

type Request struct {
	Config     aws.Config
	ClientInfo metadata.ClientInfo
	Handlers   Handlers

	Retryer
	Time                   time.Time
	ExpireTime             time.Duration
	Operation              *Operation
	HTTPRequest            *http.Request
	HTTPResponse           *http.Response
	Body                   io.ReadSeeker
	BodyStart              int64 // offset from beginning of Body that the request body starts
	Params                 interface{}
	Error                  error
	Data                   interface{}
	RequestID              string
	RetryCount             int
	Retryable              *bool
	RetryDelay             time.Duration
	NotHoist               bool
	SignedHeaderVals       http.Header
	LastSignedAt           time.Time
	DisableFollowRedirects bool
	// contains filtered or unexported fields
}

A Request is the service request to be made.

func New 

func New(cfg aws.Config, clientInfo metadata.ClientInfo, handlers Handlers,
	retryer Retryer, operation *Operation, params interface{}, data interface{}) *Request

New returns a new Request pointer for the service API operation and parameters.

Params is any value of input parameters to be the request payload. Data is pointer value to an object which the request's response payload will be deserialized to.

func (*Request) ApplyOptions 

func (r *Request) ApplyOptions(opts ...Option)

ApplyOptions will apply each option to the request calling them in the order the were provided.

func (*Request) Build 

func (r *Request) Build() error

Build will build the request's object so it can be signed and sent to the service. Build will also validate all the request's parameters. Anny additional build Handlers set on this request will be run in the order they were set.

The request will only be built once. Multiple calls to build will have no effect.

If any Validate or Build errors occur the build will stop and the error which occurred will be returned.

func (*Request) Context 

func (r *Request) Context() aws.Context

Context will always returns a non-nil context. If Request does not have a context aws.BackgroundContext will be returned.

func (*Request) DataFilled 

func (r *Request) DataFilled() bool

DataFilled returns true if the request's data for response deserialization target has been set and is a valid. False is returned if data is not set, or is invalid.

func (*Request) EachPage 

func (r *Request) EachPage(fn func(data interface{}, isLastPage bool) (shouldContinue bool)) error

EachPage iterates over each page of a paginated request object. The fn parameter should be a function with the following sample signature: 

func(page *T, lastPage bool) bool {
    return true // return false to stop iterating
}

Where "T" is the structure type matching the output structure of the given operation. For example, a request object generated by DynamoDB.ListTablesRequest() would expect to see dynamodb.ListTablesOutput as the structure "T". The lastPage value represents whether the page is the last page of data or not. The return value of this function should return true to keep iterating or false to stop.

Deprecated Use Pagination type for configurable pagination of API operations

func (*Request) GetBody 

func (r *Request) GetBody() io.ReadSeeker

GetBody will return an io.ReadSeeker of the Request's underlying input body with a concurrency safe wrapper.

func (*Request) HasNextPage 

func (r *Request) HasNextPage() bool

HasNextPage returns true if this request has more pages of data available.

Deprecated Use Pagination type for configurable pagination of API operations

func (*Request) IsErrorExpired 

func (r *Request) IsErrorExpired() bool

IsErrorExpired returns whether the error code is a credential expiry error. Returns false if the request has no Error set.

Alias for the utility function IsErrorExpiredCreds

func (*Request) IsErrorRetryable 

func (r *Request) IsErrorRetryable() bool

IsErrorRetryable returns whether the error is retryable, based on its Code. Returns false if the request has no Error set.

Alias for the utility function IsErrorRetryable

func (*Request) IsErrorThrottle 

func (r *Request) IsErrorThrottle() bool

IsErrorThrottle returns whether the error is to be throttled based on its code. Returns false if the request has no Error set

Alias for the utility function IsErrorThrottle

func (*Request) NextPage 

func (r *Request) NextPage() *Request

NextPage returns a new Request that can be executed to return the next page of result data. Call .Send() on this request to execute it.

Deprecated Use Pagination type for configurable pagination of API operations

func (*Request) ParamsFilled 

func (r *Request) ParamsFilled() bool

ParamsFilled returns if the request's parameters have been populated and the parameters are valid. False is returned if no parameters are provided or invalid.

func (*Request) Presign 

func (r *Request) Presign(expireTime time.Duration) (string, error)

Presign returns the request's signed URL. Error will be returned if the signing fails.

func (*Request) PresignRequest 

func (r *Request) PresignRequest(expireTime time.Duration) (string, http.Header, error)

PresignRequest behaves just like presign, with the addition of returning a set of headers that were signed.

Returns the URL string for the API operation with signature in the query string, and the HTTP headers that were included in the signature. These headers must be included in any HTTP request made with the presigned URL.

To prevent hoisting any headers to the query string set NotHoist to true on this Request value prior to calling PresignRequest.

func (*Request) ResetBody 

func (r *Request) ResetBody()

ResetBody rewinds the request body back to its starting position, and set's the HTTP Request body reference. When the body is read prior to being sent in the HTTP request it will need to be rewound.

ResetBody will automatically be called by the SDK's build handler, but if the request is being used directly ResetBody must be called before the request is Sent. SetStringBody, SetBufferBody, and SetReaderBody will automatically call ResetBody.

Will also set the Go 1.8's http.Request.GetBody member to allow retrying PUT/POST redirects.

func (*Request) Send 

func (r *Request) Send() error

Send will send the request returning error if errors are encountered.

Send will sign the request prior to sending. All Send Handlers will be executed in the order they were set.

Canceling a request is non-deterministic. If a request has been canceled, then the transport will choose, randomly, one of the state channels during reads or getting the connection.

readLoop() and getConn(req *Request, cm connectMethod) https://github.com/golang/go/blob/master/src/net/http/transport.go

Send will not close the request.Request's body.

func (*Request) SetBufferBody 

func (r *Request) SetBufferBody(buf []byte)

SetBufferBody will set the request's body bytes that will be sent to the service API.

func (*Request) SetContext 

func (r *Request) SetContext(ctx aws.Context)

SetContext adds a Context to the current request that can be used to cancel a in-flight request. The Context value must not be nil, or this method will panic.

Unlike http.Request.WithContext, SetContext does not return a copy of the Request. It is not safe to use use a single Request value for multiple requests. A new Request should be created for each API operation request.

Go 1.6 and below: The http.Request's Cancel field will be set to the Done() value of the context. This will overwrite the Cancel field's value.

Go 1.7 and above: The http.Request.WithContext will be used to set the context on the underlying http.Request. This will create a shallow copy of the http.Request. The SDK may create sub contexts in the future for nested requests such as retries.

func (*Request) SetReaderBody 

func (r *Request) SetReaderBody(reader io.ReadSeeker)

SetReaderBody will set the request's body reader.

func (*Request) SetStringBody 

func (r *Request) SetStringBody(s string)

SetStringBody sets the body of the request to be backed by a string.

func (*Request) Sign 

func (r *Request) Sign() error

Sign will sign the request returning error if errors are encountered.

Send will build the request prior to signing. All Sign Handlers will be executed in the order they were set.

func (*Request) WillRetry 

func (r *Request) WillRetry() bool

WillRetry returns if the request's can be retried.

type Retryer 

type Retryer interface {
	RetryRules(*Request) time.Duration
	ShouldRetry(*Request) bool
	MaxRetries() int
}

Retryer is an interface to control retry logic for a given service. The default implementation used by most services is the client.DefaultRetryer structure, which contains basic retry logic using exponential backoff.

type Validator 

type Validator interface {
	Validate() error
}

Validator provides a way for types to perform validation logic on their input values that external code can use to determine if a type's values are valid.

type Waiter 

type Waiter struct {
	Name      string
	Acceptors []WaiterAcceptor
	Logger    aws.Logger

	MaxAttempts int
	Delay       WaiterDelay

	RequestOptions   []Option
	NewRequest       func([]Option) (*Request, error)
	SleepWithContext func(aws.Context, time.Duration) error
}

A Waiter provides the functionality to perform a blocking call which will wait for a resource state to be satisfied by a service.

This type should not be used directly. The API operations provided in the service packages prefixed with "WaitUntil" should be used instead.

func (*Waiter) ApplyOptions 

func (w *Waiter) ApplyOptions(opts ...WaiterOption)

ApplyOptions updates the waiter with the list of waiter options provided.

func (Waiter) WaitWithContext 

func (w Waiter) WaitWithContext(ctx aws.Context) error

WaitWithContext will make requests for the API operation using NewRequest to build API requests. The request's response will be compared against the Waiter's Acceptors to determine the successful state of the resource the waiter is inspecting.

The passed in context must not be nil. If it is nil a panic will occur. The Context will be used to cancel the waiter's pending requests and retry delays. Use aws.BackgroundContext if no context is available.

The waiter will continue until the target state defined by the Acceptors, or the max attempts expires.

Will return the WaiterResourceNotReadyErrorCode error code if the waiter's retryer ShouldRetry returns false. This normally will happen when the max wait attempts expires.

type WaiterAcceptor 

type WaiterAcceptor struct {
	State    WaiterState
	Matcher  WaiterMatchMode
	Argument string
	Expected interface{}
}

A WaiterAcceptor provides the information needed to wait for an API operation to complete.

type WaiterDelay 

type WaiterDelay func(attempt int) time.Duration

WaiterDelay will return a delay the waiter should pause between attempts to check the resource state. The passed in attempt is the number of times the Waiter has checked the resource state.

Attempt is the number of attempts the Waiter has made checking the resource state.

func ConstantWaiterDelay 

func ConstantWaiterDelay(delay time.Duration) WaiterDelay

ConstantWaiterDelay returns a WaiterDelay that will always return a constant delay the waiter should use between attempts. It ignores the number of attempts made.

type WaiterMatchMode 

type WaiterMatchMode int

WaiterMatchMode is the mode that the waiter will use to match the WaiterAcceptor definition's Expected attribute. 

const (
	PathAllWaiterMatch  WaiterMatchMode = iota // match on all paths
	PathWaiterMatch                            // match on specific path
	PathAnyWaiterMatch                         // match on any path
	PathListWaiterMatch                        // match on list of paths
	StatusWaiterMatch                          // match on status code
	ErrorWaiterMatch                           // match on error
)

Modes the waiter will use when inspecting API response to identify target resource states.

func (WaiterMatchMode) String 

func (m WaiterMatchMode) String() string

String returns the string representation of the waiter match mode.

type WaiterOption 

type WaiterOption func(*Waiter)

A WaiterOption is a function that will update the Waiter value's fields to configure the waiter.

func WithWaiterDelay 

func WithWaiterDelay(delayer WaiterDelay) WaiterOption

WithWaiterDelay will set the Waiter to use the WaiterDelay passed in.

func WithWaiterLogger 

func WithWaiterLogger(logger aws.Logger) WaiterOption

WithWaiterLogger returns a waiter option to set the logger a waiter should use to log warnings and errors to.

func WithWaiterMaxAttempts 

func WithWaiterMaxAttempts(max int) WaiterOption

WithWaiterMaxAttempts returns the maximum number of times the waiter should attempt to check the resource for the target state.

func WithWaiterRequestOptions 

func WithWaiterRequestOptions(opts ...Option) WaiterOption

WithWaiterRequestOptions returns a waiter option setting the request options for each request the waiter makes. Appends to waiter's request options already set.

type WaiterState 

type WaiterState int

WaiterState are states the waiter uses based on WaiterAcceptor definitions to identify if the resource state the waiter is waiting on has occurred. 

const (
	SuccessWaiterState WaiterState = iota // waiter successful
	FailureWaiterState                    // waiter failed
	RetryWaiterState                      // waiter needs to be retried
)

States the waiter acceptors will use to identify target resource states.

func (WaiterState) String 

func (s WaiterState) String() string

String returns the string representation of the waiter state.

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