aws

package
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 Go to latest Published: Jan 26, 2021 License: Apache-2.0 Imports: 19 Imported by: 28

Documentation

Overview

Package aws provides core functionality for making requests to AWS services.

Index

Constants

View Source 
const DefaultRetries = -1

The default number of retries for a service. The value of -1 indicates that the service specific retry default will be used.

View Source 
const SDKName = "aws-sdk-go"

SDKName is the name of this AWS SDK

View Source 
const SDKVersion = "0.6.5"

SDKVersion is the version of this SDK

Variables

View Source 
var (
	// ErrMissingRegion is an error that is returned if region configuration is
	// not found.
	ErrMissingRegion error = apierr.New("MissingRegion", "could not find region configuration", nil)

	// ErrMissingEndpoint is an error that is returned if an endpoint cannot be
	// resolved for a service.
	ErrMissingEndpoint error = apierr.New("MissingEndpoint", "'Endpoint' configuration is required for this service", nil)
)
View Source 
var DefaultChainCredentials = credentials.NewChainCredentials(
	[]credentials.Provider{
		&credentials.EnvProvider{},
		&credentials.SharedCredentialsProvider{Filename: "", Profile: ""},
		&credentials.EC2RoleProvider{ExpiryWindow: 5 * time.Minute},
	})

DefaultChainCredentials is a Credentials which will find the first available credentials Value from the list of Providers.

This should be used in the default case. Once the type of credentials are known switching to the specific Credentials will be more efficient.

View Source 
var DefaultConfig = &Config{
	Credentials:             DefaultChainCredentials,
	Endpoint:                "",
	Region:                  os.Getenv("AWS_REGION"),
	DisableSSL:              false,
	ManualSend:              false,
	HTTPClient:              http.DefaultClient,
	LogHTTPBody:             false,
	LogLevel:                0,
	Logger:                  os.Stdout,
	MaxRetries:              DefaultRetries,
	DisableParamValidation:  false,
	DisableComputeChecksums: false,
	S3ForcePathStyle:        false,
}

DefaultConfig is the default all service configuration will be based off of.

Functions

func AfterRetryHandler 

func AfterRetryHandler(r *Request)

AfterRetryHandler performs final checks to determine if the request should be retried and how long to delay.

func Boolean 

func Boolean(v bool) *bool

Boolean converts a Go bool into a boolean pointer.

func BuildContentLength 

func BuildContentLength(r *Request)

BuildContentLength builds the content length of a request based on the body, or will use the HTTPRequest.Header's "Content-Length" if defined. If unable to determine request body length and no "Content-Length" was specified it will panic.

func ContentTypeHandler 

func ContentTypeHandler(r *Request)

func Double 

func Double(v float64) *float64

Double converts a Go float64 into a double pointer.

func Long 

func Long(v int64) *int64

Long converts a Go int64 into a long pointer.

func SendHandler 

func SendHandler(r *Request)

SendHandler is a request handler to send service request using HTTP client.

func String 

func String(v string) *string

String converts a Go string into a string pointer.

func Time 

func Time(t time.Time) *time.Time

Time converts a Go Time into a Time pointer

func UserAgentHandler 

func UserAgentHandler(r *Request)

UserAgentHandler is a request handler for injecting User agent into requests.

func ValidateEndpointHandler 

func ValidateEndpointHandler(r *Request)

ValidateEndpointHandler is a request handler to validate a request had the appropriate Region and Endpoint set. Will set r.Error if the endpoint or region is not valid.

func ValidateParameters 

func ValidateParameters(r *Request)

ValidateParameters is a request handler to validate the input parameters. Validating parameters only has meaning if done prior to the request being sent.

func ValidateResponseHandler 

func ValidateResponseHandler(r *Request)

ValidateResponseHandler is a request handler to validate service response.

Types

type Config 

type Config struct {
	Credentials             *credentials.Credentials
	Endpoint                string
	Region                  string
	DisableSSL              bool
	ManualSend              bool
	HTTPClient              *http.Client
	LogHTTPBody             bool
	LogLevel                uint
	Logger                  io.Writer
	MaxRetries              int
	DisableParamValidation  bool
	DisableComputeChecksums bool
	S3ForcePathStyle        bool
}

A Config provides service configuration

func (Config) Copy 

func (c Config) Copy() Config

Copy will return a shallow copy of the Config object.

func (Config) Merge 

func (c Config) Merge(newcfg *Config) *Config

Merge merges the newcfg attribute values into this Config. Each attribute will be merged into this config if the newcfg attribute's value is non-zero. Due to this, newcfg attributes with zero values cannot be merged in. For example bool attributes cannot be cleared using Merge, and must be explicitly set on the Config structure.

type HandlerList 

type HandlerList struct {
	// 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 handlers f to the back of the handler list.

func (*HandlerList) PushFront 

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

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

func (*HandlerList) Run 

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

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

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
}

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

type Operation 

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

An Operation is the service API operation to be made.

type Paginator 

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

Paginator keeps track of pagination configuration for an API operation.

type ReaderSeekerCloser 

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

ReaderSeekerCloser represents a reader that can also delegate io.Seeker and io.Closer interfaces to the underlying object if they are available.

func ReadSeekCloser 

func ReadSeekCloser(r io.Reader) ReaderSeekerCloser

ReadSeekCloser wraps a io.Reader returning a ReaderSeakerCloser

func (ReaderSeekerCloser) Close 

func (r ReaderSeekerCloser) Close() error

Close closes the ReaderSeekerCloser.

If the ReaderSeekerCloser is not an io.Closer nothing will be done.

func (ReaderSeekerCloser) Read 

func (r ReaderSeekerCloser) Read(p []byte) (int, error)

Read reads from the reader up to size of p. The number of bytes read, and error if it occurred will be returned.

If the reader is not an io.Reader zero bytes read, and nil error will be returned.

Performs the same functionality as io.Reader Read

func (ReaderSeekerCloser) Seek 

func (r ReaderSeekerCloser) Seek(offset int64, whence int) (int64, error)

Seek sets the offset for the next Read to offset, interpreted according to whence: 0 means relative to the origin of the file, 1 means relative to the current offset, and 2 means relative to the end. Seek returns the new offset and an error, if any.

If the ReaderSeekerCloser is not an io.Seeker nothing will be done.

type Request 

type Request struct {
	*Service
	Handlers     Handlers
	Time         time.Time
	ExpireTime   time.Duration
	Operation    *Operation
	HTTPRequest  *http.Request
	HTTPResponse *http.Response
	Body         io.ReadSeeker

	Params     interface{}
	Error      error
	Data       interface{}
	RequestID  string
	RetryCount uint
	Retryable  SettableBool
	RetryDelay time.Duration
	// contains filtered or unexported fields
}

A Request is the service request to be made.

func NewRequest 

func NewRequest(service *Service, operation *Operation, params interface{}, data interface{}) *Request

NewRequest 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) 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) 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.

func (*Request) HasNextPage 

func (r *Request) HasNextPage() bool

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

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.

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) 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.

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) 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 retuning 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 Service 

type Service struct {
	Config            *Config
	Handlers          Handlers
	ManualSend        bool
	ServiceName       string
	APIVersion        string
	Endpoint          string
	SigningName       string
	SigningRegion     string
	JSONVersion       string
	TargetPrefix      string
	RetryRules        func(*Request) time.Duration
	ShouldRetry       func(*Request) bool
	DefaultMaxRetries uint
}

A Service implements the base service request and response handling used by all services.

func NewService 

func NewService(config *Config) *Service

NewService will return a pointer to a new Server object initialized.

func (*Service) AddDebugHandlers 

func (s *Service) AddDebugHandlers()

AddDebugHandlers injects debug logging handlers into the service to log request debug information.

func (*Service) Initialize 

func (s *Service) Initialize()

Initialize initializes the service.

func (*Service) MaxRetries 

func (s *Service) MaxRetries() uint

MaxRetries returns the number of maximum returns the service will use to make an individual API request.

type SettableBool 

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

A SettableBool provides a boolean value which includes the state if the value was set or unset. The set state is in addition to the value's value(true|false)

func SetBool 

func SetBool(value bool) SettableBool

SetBool returns a SettableBool with a value set

func (*SettableBool) Get 

func (b *SettableBool) Get() bool

Get returns the value. Will always be false if the SettableBool was not set.

func (*SettableBool) GoString 

func (b *SettableBool) GoString() string

GoString returns the string representation of the SettableBool value and state

func (*SettableBool) IsSet 

func (b *SettableBool) IsSet() bool

IsSet returns if the value has been set

func (*SettableBool) Reset 

func (b *SettableBool) Reset()

Reset resets the state and value of the SettableBool to its initial default state of not set and zero value.

func (*SettableBool) Set 

func (b *SettableBool) Set(value bool)

Set sets the value and updates the state that the value has been set.

func (*SettableBool) String 

func (b *SettableBool) String() string

String returns the string representation of the value if set. Zero if not set.

Source Files

View all Source files

Directories

Path Synopsis
Package awserr represents API error interface accessors for the SDK.
 Package awserr represents API error interface accessors for the SDK.
Package credentials provides credential retrieval and management The Credentials is the primary method of getting access to and managing credentials Values.
 Package credentials provides credential retrieval and management The Credentials is the primary method of getting access to and managing credentials Values.

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