autorest

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 Go to latest Published: Aug 9, 2018 License: Apache-2.0 Imports: 21 Imported by: 0

Documentation

Overview

Package autorest implements an HTTP request pipeline suitable for use across multiple go-routines and provides the shared routines relied on by AutoRest (see https://github.com/Azure/autorest/) generated Go code.

The package breaks sending and responding to HTTP requests into three phases: Preparing, Sending, and Responding. A typical pattern is: 

req, err := Prepare(&http.Request{},
  token.WithAuthorization())

resp, err := Send(req,
  WithLogging(logger),
  DoErrorIfStatusCode(http.StatusInternalServerError),
  DoCloseIfError(),
  DoRetryForAttempts(5, time.Second))

err = Respond(resp,
  ByDiscardingBody(),
  ByClosing())

Each phase relies on decorators to modify and / or manage processing. Decorators may first modify and then pass the data along, pass the data first and then modify the result, or wrap themselves around passing the data (such as a logger might do). Decorators run in the order provided. For example, the following: 

req, err := Prepare(&http.Request{},
  WithBaseURL("https://microsoft.com/"),
  WithPath("a"),
  WithPath("b"),
  WithPath("c"))

will set the URL to: 

https://microsoft.com/a/b/c

Preparers and Responders may be shared and re-used (assuming the underlying decorators support sharing and re-use). Performant use is obtained by creating one or more Preparers and Responders shared among multiple go-routines, and a single Sender shared among multiple sending go-routines, all bound together by means of input / output channels.

Decorators hold their passed state within a closure (such as the path components in the example above). Be careful to share Preparers and Responders only in a context where such held state applies. For example, it may not make sense to share a Preparer that applies a query string from a fixed set of values. Similarly, sharing a Responder that reads the response body into a passed struct (e.g., ByUnmarshallingJson) is likely incorrect.

Lastly, the Swagger specification (https://swagger.io) that drives AutoRest (https://github.com/Azure/autorest/) precisely defines two date forms: date and date-time. The github.com/Azure/go-autorest/autorest/date package provides time.Time derivations to ensure correct parsing and formatting.

Errors raised by autorest objects and methods will conform to the autorest.Error interface.

See the included examples for more detail. For details on the suggested use of this package by generated clients, see the Client described below.

Index

Examples

Constants

View Source 
const (
	// HeaderLocation specifies the HTTP Location header.
	HeaderLocation = "Location"

	// HeaderRetryAfter specifies the HTTP Retry-After header.
	HeaderRetryAfter = "Retry-After"
)
View Source 
const (
	// DefaultPollingDelay is a reasonable delay between polling requests.
	DefaultPollingDelay = 60 * time.Second

	// DefaultPollingDuration is a reasonable total polling duration.
	DefaultPollingDuration = 15 * time.Minute

	// DefaultRetryAttempts is number of attempts for retry status codes (5xx).
	DefaultRetryAttempts = 3

	// DefaultRetryDuration is the duration to wait between retries.
	DefaultRetryDuration = 30 * time.Second
)
View Source 
const (
	// UndefinedStatusCode is used when HTTP status code is not available for an error.
	UndefinedStatusCode = 0
)

Variables

View Source 
var (
	// StatusCodesForRetry are a defined group of status code for which the client will retry
	StatusCodesForRetry = []int{
		http.StatusRequestTimeout,
		http.StatusTooManyRequests,
		http.StatusInternalServerError,
		http.StatusBadGateway,
		http.StatusServiceUnavailable,
		http.StatusGatewayTimeout,
	}
)

Functions

func AsStringSlice 

func AsStringSlice(s interface{}) ([]string, error)

AsStringSlice method converts interface{} to []string. This expects a that the parameter passed to be a slice or array of a type that has the underlying type a string.

Example 
type TestEnumType string

a := []TestEnumType{"value1", "value2"}
b, _ := AsStringSlice(a)
for _, c := range b {
	fmt.Println(c)
}

Output:

value1
value2

func ChangeToGet 

func ChangeToGet(req *http.Request) *http.Request

ChangeToGet turns the specified http.Request into a GET (it assumes it wasn't). This is mainly useful for long-running operations that use the Azure-AsyncOperation header, so we change the initial PUT into a GET to retrieve the final result.

func CopyAndDecode 

func CopyAndDecode(encodedAs EncodedAs, r io.Reader, v interface{}) (bytes.Buffer, error)

CopyAndDecode decodes the data from the passed io.Reader while making a copy. Having a copy is especially useful if there is a chance the data will fail to decode. encodedAs specifies the expected encoding, r provides the io.Reader to the data, and v is the decoding destination.

func DelayForBackoff 

func DelayForBackoff(backoff time.Duration, attempt int, cancel <-chan struct{}) bool

DelayForBackoff invokes time.After for the supplied backoff duration raised to the power of passed attempt (i.e., an exponential backoff delay). Backoff duration is in seconds and can set to zero for no delay. The delay may be canceled by closing the passed channel. If terminated early, returns false. Note: Passing attempt 1 will result in doubling "backoff" duration. Treat this as a zero-based attempt count.

func DelayWithRetryAfter 

func DelayWithRetryAfter(resp *http.Response, cancel <-chan struct{}) bool

DelayWithRetryAfter invokes time.After for the duration specified in the "Retry-After" header in responses with status code 429

func Encode 

func Encode(location string, v interface{}, sep ...string) string

Encode method encodes url path and query parameters.

func ExtractHeader 

func ExtractHeader(header string, resp *http.Response) []string

ExtractHeader extracts all values of the specified header from the http.Response. It returns an empty string slice if the passed http.Response is nil or the header does not exist.

func ExtractHeaderValue 

func ExtractHeaderValue(header string, resp *http.Response) string

ExtractHeaderValue extracts the first value of the specified header from the http.Response. It returns an empty string if the passed http.Response is nil or the header does not exist.

func GetLocation 

func GetLocation(resp *http.Response) string

GetLocation retrieves the URL from the Location header of the passed response.

func GetRetryAfter 

func GetRetryAfter(resp *http.Response, defaultDelay time.Duration) time.Duration

GetRetryAfter extracts the retry delay from the Retry-After header of the passed response. If the header is absent or is malformed, it will return the supplied default delay time.Duration.

func IsTemporaryNetworkError 

func IsTemporaryNetworkError(err error) bool

IsTemporaryNetworkError returns true if the specified error is a temporary network error or false if it's not. If the error doesn't implement the net.Error interface the return value is true.

func IsTokenRefreshError 

func IsTokenRefreshError(err error) bool

IsTokenRefreshError returns true if the specified error implements the TokenRefreshError interface. If err is a DetailedError it will walk the chain of Original errors.

func MapToValues 

func MapToValues(m map[string]interface{}) url.Values

MapToValues method converts map[string]interface{} to url.Values.

func NewPollingRequest 

func NewPollingRequest(resp *http.Response, cancel <-chan struct{}) (*http.Request, error)

NewPollingRequest allocates and returns a new http.Request to poll for the passed response.

func NewPollingRequestWithContext 

func NewPollingRequestWithContext(ctx context.Context, resp *http.Response) (*http.Request, error)

NewPollingRequestWithContext allocates and returns a new http.Request with the specified context to poll for the passed response.

func Prepare 

func Prepare(r *http.Request, decorators ...PrepareDecorator) (*http.Request, error)

Prepare accepts an http.Request and a, possibly empty, set of PrepareDecorators. It creates a Preparer from the decorators which it then applies to the passed http.Request.

Example

Create and prepare an http.Request in one call 

r, err := Prepare(&http.Request{},
	AsGet(),
	WithBaseURL("https://microsoft.com/"),
	WithPath("a/b/c/"))
if err != nil {
	fmt.Printf("ERROR: %v\n", err)
} else {
	fmt.Printf("%s %s", r.Method, r.URL)
}

Output:

GET https://microsoft.com/a/b/c/

func Respond 

func Respond(r *http.Response, decorators ...RespondDecorator) error

Respond accepts an http.Response and a, possibly empty, set of RespondDecorators. It creates a Responder from the decorators it then applies to the passed http.Response.

func ResponseHasStatusCode 

func ResponseHasStatusCode(resp *http.Response, codes ...int) bool

ResponseHasStatusCode returns true if the status code in the HTTP Response is in the passed set and false otherwise.

func Send 

func Send(r *http.Request, decorators ...SendDecorator) (*http.Response, error)

Send sends, by means of the default http.Client, the passed http.Request, returning the http.Response and possible error. It also accepts a, possibly empty, set of SendDecorators which it will apply the http.Client before invoking the Do method.

Send is a convenience method and not recommended for production. Advanced users should use SendWithSender, passing and sharing their own Sender (e.g., instance of http.Client).

Send will not poll or retry requests.

func SendWithSender 

func SendWithSender(s Sender, r *http.Request, decorators ...SendDecorator) (*http.Response, error)

SendWithSender sends the passed http.Request, through the provided Sender, returning the http.Response and possible error. It also accepts a, possibly empty, set of SendDecorators which it will apply the http.Client before invoking the Do method.

SendWithSender will not poll or retry requests.

Example 
r := mocks.NewResponseWithStatus("202 Accepted", http.StatusAccepted)
mocks.SetAcceptedHeaders(r)

client := mocks.NewSender()
client.AppendAndRepeatResponse(r, 10)

logger := log.New(os.Stdout, "autorest: ", 0)
na := NullAuthorizer{}

req, _ := Prepare(&http.Request{},
	AsGet(),
	WithBaseURL("https://microsoft.com/a/b/c/"),
	na.WithAuthorization())

r, _ = SendWithSender(client, req,
	WithLogging(logger),
	DoErrorIfStatusCode(http.StatusAccepted),
	DoCloseIfError(),
	DoRetryForAttempts(5, time.Duration(0)))

Respond(r,
	ByDiscardingBody(),
	ByClosing())

Output:

autorest: Sending GET https://microsoft.com/a/b/c/
autorest: GET https://microsoft.com/a/b/c/ received 202 Accepted
autorest: Sending GET https://microsoft.com/a/b/c/
autorest: GET https://microsoft.com/a/b/c/ received 202 Accepted
autorest: Sending GET https://microsoft.com/a/b/c/
autorest: GET https://microsoft.com/a/b/c/ received 202 Accepted
autorest: Sending GET https://microsoft.com/a/b/c/
autorest: GET https://microsoft.com/a/b/c/ received 202 Accepted
autorest: Sending GET https://microsoft.com/a/b/c/
autorest: GET https://microsoft.com/a/b/c/ received 202 Accepted

func String 

func String(v interface{}, sep ...string) string

String method converts interface v to string. If interface is a list, it joins list elements using the seperator. Note that only sep[0] will be used for joining if any separator is specified.

Example 
m := []string{
	"string1",
	"string2",
	"string3",
}

fmt.Println(String(m, ","))

Output:

string1,string2,string3

func TeeReadCloser 

func TeeReadCloser(rc io.ReadCloser, w io.Writer) io.ReadCloser

TeeReadCloser returns a ReadCloser that writes to w what it reads from rc. It utilizes io.TeeReader to copy the data read and has the same behavior when reading. Further, when it is closed, it ensures that rc is closed as well.

func Version 

func Version() string

Version returns the semantic version (see http://semver.org).

Types

type APIKeyAuthorizer 

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

APIKeyAuthorizer implements API Key authorization.

func NewAPIKeyAuthorizer 

func NewAPIKeyAuthorizer(headers map[string]interface{}, queryParameters map[string]interface{}) *APIKeyAuthorizer

NewAPIKeyAuthorizer creates an ApiKeyAuthorizer with headers.

func NewAPIKeyAuthorizerWithHeaders 

func NewAPIKeyAuthorizerWithHeaders(headers map[string]interface{}) *APIKeyAuthorizer

NewAPIKeyAuthorizerWithHeaders creates an ApiKeyAuthorizer with headers.

func NewAPIKeyAuthorizerWithQueryParameters 

func NewAPIKeyAuthorizerWithQueryParameters(queryParameters map[string]interface{}) *APIKeyAuthorizer

NewAPIKeyAuthorizerWithQueryParameters creates an ApiKeyAuthorizer with query parameters.

func (*APIKeyAuthorizer) WithAuthorization 

func (aka *APIKeyAuthorizer) WithAuthorization() PrepareDecorator

WithAuthorization returns a PrepareDecorator that adds an HTTP headers and Query Paramaters

type Authorizer 

type Authorizer interface {
	WithAuthorization() PrepareDecorator
}

Authorizer is the interface that provides a PrepareDecorator used to supply request authorization. Most often, the Authorizer decorator runs last so it has access to the full state of the formed HTTP request.

type BearerAuthorizer 

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

BearerAuthorizer implements the bearer authorization

func NewBearerAuthorizer 

func NewBearerAuthorizer(tp adal.OAuthTokenProvider) *BearerAuthorizer

NewBearerAuthorizer crates a BearerAuthorizer using the given token provider

func (*BearerAuthorizer) WithAuthorization 

func (ba *BearerAuthorizer) WithAuthorization() PrepareDecorator

WithAuthorization returns a PrepareDecorator that adds an HTTP Authorization header whose value is "Bearer " followed by the token.

By default, the token will be automatically refreshed through the Refresher interface.

type BearerAuthorizerCallback 

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

BearerAuthorizerCallback implements bearer authorization via a callback.

func NewBearerAuthorizerCallback 

func NewBearerAuthorizerCallback(sender Sender, callback BearerAuthorizerCallbackFunc) *BearerAuthorizerCallback

NewBearerAuthorizerCallback creates a bearer authorization callback. The callback is invoked when the HTTP request is submitted.

func (*BearerAuthorizerCallback) WithAuthorization 

func (bacb *BearerAuthorizerCallback) WithAuthorization() PrepareDecorator

WithAuthorization returns a PrepareDecorator that adds an HTTP Authorization header whose value is "Bearer " followed by the token. The BearerAuthorizer is obtained via a user-supplied callback.

By default, the token will be automatically refreshed through the Refresher interface.

type BearerAuthorizerCallbackFunc 

type BearerAuthorizerCallbackFunc func(tenantID, resource string) (*BearerAuthorizer, error)

BearerAuthorizerCallbackFunc is the authentication callback signature.

type Client 

type Client struct {
	Authorizer        Authorizer
	Sender            Sender
	RequestInspector  PrepareDecorator
	ResponseInspector RespondDecorator

	// PollingDelay sets the polling frequency used in absence of a Retry-After HTTP header
	PollingDelay time.Duration

	// PollingDuration sets the maximum polling time after which an error is returned.
	PollingDuration time.Duration

	// RetryAttempts sets the default number of retry attempts for client.
	RetryAttempts int

	// RetryDuration sets the delay duration for retries.
	RetryDuration time.Duration

	// UserAgent, if not empty, will be set as the HTTP User-Agent header on all requests sent
	// through the Do method.
	UserAgent string

	Jar http.CookieJar

	// Set to true to skip attempted registration of resource providers (false by default).
	SkipResourceProviderRegistration bool
}

Client is the base for autorest generated clients. It provides default, "do nothing" implementations of an Authorizer, RequestInspector, and ResponseInspector. It also returns the standard, undecorated http.Client as a default Sender.

Generated clients should also use Error (see NewError and NewErrorWithError) for errors and return responses that compose with Response.

Most customization of generated clients is best achieved by supplying a custom Authorizer, custom RequestInspector, and / or custom ResponseInspector. Users may log requests, implement circuit breakers (see https://msdn.microsoft.com/en-us/library/dn589784.aspx) or otherwise influence sending the request by providing a decorated Sender.

func NewClientWithUserAgent 

func NewClientWithUserAgent(ua string) Client

NewClientWithUserAgent returns an instance of a Client with the UserAgent set to the passed string.

func (*Client) AddToUserAgent 

func (c *Client) AddToUserAgent(extension string) error

AddToUserAgent adds an extension to the current user agent

func (Client) ByInspecting 

func (c Client) ByInspecting() RespondDecorator

ByInspecting is a convenience method that passes the response to the supplied ResponseInspector, if present, or returns the ByIgnoring RespondDecorator otherwise.

func (Client) Do 

func (c Client) Do(r *http.Request) (*http.Response, error)

Do implements the Sender interface by invoking the active Sender after applying authorization. If Sender is not set, it uses a new instance of http.Client. In both cases it will, if UserAgent is set, apply set the User-Agent header.

func (Client) WithAuthorization 

func (c Client) WithAuthorization() PrepareDecorator

WithAuthorization is a convenience method that returns the WithAuthorization PrepareDecorator from the current Authorizer. If not Authorizer is set, it uses the NullAuthorizer.

func (Client) WithInspection 

func (c Client) WithInspection() PrepareDecorator

WithInspection is a convenience method that passes the request to the supplied RequestInspector, if present, or returns the WithNothing PrepareDecorator otherwise.

type CognitiveServicesAuthorizer 

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

CognitiveServicesAuthorizer implements authorization for Cognitive Services.

func NewCognitiveServicesAuthorizer 

func NewCognitiveServicesAuthorizer(subscriptionKey string) *CognitiveServicesAuthorizer

NewCognitiveServicesAuthorizer is

func (*CognitiveServicesAuthorizer) WithAuthorization 

func (csa *CognitiveServicesAuthorizer) WithAuthorization() PrepareDecorator

WithAuthorization is

type Decoder 

type Decoder interface {
	Decode(v interface{}) error
}

Decoder defines the decoding method json.Decoder and xml.Decoder share

func NewDecoder 

func NewDecoder(encodedAs EncodedAs, r io.Reader) Decoder

NewDecoder creates a new decoder appropriate to the passed encoding. encodedAs specifies the type of encoding and r supplies the io.Reader containing the encoded data.

type DetailedError 

type DetailedError struct {
	Original error

	// PackageType is the package type of the object emitting the error. For types, the value
	// matches that produced the the '%T' format specifier of the fmt package. For other elements,
	// such as functions, it is just the package name (e.g., "autorest").
	PackageType string

	// Method is the name of the method raising the error.
	Method string

	// StatusCode is the HTTP Response StatusCode (if non-zero) that led to the error.
	StatusCode interface{}

	// Message is the error message.
	Message string

	// Service Error is the response body of failed API in bytes
	ServiceError []byte

	// Response is the response object that was returned during failure if applicable.
	Response *http.Response
}

DetailedError encloses a error with details of the package, method, and associated HTTP status code (if any).

func NewError 

func NewError(packageType string, method string, message string, args ...interface{}) DetailedError

NewError creates a new Error conforming object from the passed packageType, method, and message. message is treated as a format string to which the optional args apply.

func NewErrorWithError 

func NewErrorWithError(original error, packageType string, method string, resp *http.Response, message string, args ...interface{}) DetailedError

NewErrorWithError creates a new Error conforming object from the passed packageType, method, statusCode of the given resp (UndefinedStatusCode if resp is nil), message, and original error. message is treated as a format string to which the optional args apply.

func NewErrorWithResponse 

func NewErrorWithResponse(packageType string, method string, resp *http.Response, message string, args ...interface{}) DetailedError

NewErrorWithResponse creates a new Error conforming object from the passed packageType, method, statusCode of the given resp (UndefinedStatusCode if resp is nil), and message. message is treated as a format string to which the optional args apply.

func (DetailedError) Error 

func (e DetailedError) Error() string

Error returns a formatted containing all available details (i.e., PackageType, Method, StatusCode, Message, and original error (if any)).

type EncodedAs 

type EncodedAs string

EncodedAs is a series of constants specifying various data encodings 

const (
	// EncodedAsJSON states that data is encoded as JSON
	EncodedAsJSON EncodedAs = "JSON"

	// EncodedAsXML states that data is encoded as Xml
	EncodedAsXML EncodedAs = "XML"
)

type EventGridKeyAuthorizer 

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

EventGridKeyAuthorizer implements authorization for event grid using key authentication.

func NewEventGridKeyAuthorizer 

func NewEventGridKeyAuthorizer(topicKey string) EventGridKeyAuthorizer

NewEventGridKeyAuthorizer creates a new EventGridKeyAuthorizer with the specified topic key.

func (EventGridKeyAuthorizer) WithAuthorization 

func (egta EventGridKeyAuthorizer) WithAuthorization() PrepareDecorator

WithAuthorization returns a PrepareDecorator that adds the aeg-sas-key authentication header.

type LoggingInspector 

type LoggingInspector struct {
	Logger *log.Logger
}

LoggingInspector implements request and response inspectors that log the full request and response to a supplied log.

func (LoggingInspector) ByInspecting 

func (li LoggingInspector) ByInspecting() RespondDecorator

ByInspecting returns a RespondDecorator that emits the http.Response to the supplied logger. The body is restored after being emitted.

Note: Since it reads the entire Body, this decorator should not be used where body streaming is important. It is best used to trace JSON or similar body values.

func (LoggingInspector) WithInspection 

func (li LoggingInspector) WithInspection() PrepareDecorator

WithInspection returns a PrepareDecorator that emits the http.Request to the supplied logger. The body is restored after being emitted.

Note: Since it reads the entire Body, this decorator should not be used where body streaming is important. It is best used to trace JSON or similar body values.

type NullAuthorizer 

type NullAuthorizer struct{}

NullAuthorizer implements a default, "do nothing" Authorizer.

func (NullAuthorizer) WithAuthorization 

func (na NullAuthorizer) WithAuthorization() PrepareDecorator

WithAuthorization returns a PrepareDecorator that does nothing.

type PrepareDecorator 

type PrepareDecorator func(Preparer) Preparer

PrepareDecorator takes and possibly decorates, by wrapping, a Preparer. Decorators may affect the http.Request and pass it along or, first, pass the http.Request along then affect the result.

Example

PrepareDecorators wrap and invoke a Preparer. Most often, the decorator invokes the passed Preparer and decorates the response. 

path := "a/b/c/"
pd := func() PrepareDecorator {
	return func(p Preparer) Preparer {
		return PreparerFunc(func(r *http.Request) (*http.Request, error) {
			r, err := p.Prepare(r)
			if err == nil {
				if r.URL == nil {
					return r, fmt.Errorf("ERROR: URL is not set")
				}
				r.URL.Path += path
			}
			return r, err
		})
	}
}

r, _ := Prepare(&http.Request{},
	WithBaseURL("https://microsoft.com/"),
	pd())

fmt.Printf("Path is %s\n", r.URL)

Output:

Path is https://microsoft.com/a/b/c/
Example (Pre)

PrepareDecorators may also modify and then invoke the Preparer. 

pd := func() PrepareDecorator {
	return func(p Preparer) Preparer {
		return PreparerFunc(func(r *http.Request) (*http.Request, error) {
			r.Header.Add(http.CanonicalHeaderKey("ContentType"), "application/json")
			return p.Prepare(r)
		})
	}
}

r, _ := Prepare(&http.Request{Header: http.Header{}},
	pd())

fmt.Printf("ContentType is %s\n", r.Header.Get("ContentType"))

Output:

ContentType is application/json

func AsContentType 

func AsContentType(contentType string) PrepareDecorator

AsContentType returns a PrepareDecorator that adds an HTTP Content-Type header whose value is the passed contentType.

func AsDelete 

func AsDelete() PrepareDecorator

AsDelete returns a PrepareDecorator that sets the HTTP method to DELETE.

func AsFormURLEncoded 

func AsFormURLEncoded() PrepareDecorator

AsFormURLEncoded returns a PrepareDecorator that adds an HTTP Content-Type header whose value is "application/x-www-form-urlencoded".

func AsGet 

func AsGet() PrepareDecorator

AsGet returns a PrepareDecorator that sets the HTTP method to GET.

func AsHead 

func AsHead() PrepareDecorator

AsHead returns a PrepareDecorator that sets the HTTP method to HEAD.

func AsJSON 

func AsJSON() PrepareDecorator

AsJSON returns a PrepareDecorator that adds an HTTP Content-Type header whose value is "application/json".

func AsOctetStream 

func AsOctetStream() PrepareDecorator

AsOctetStream returns a PrepareDecorator that adds the "application/octet-stream" Content-Type header.

func AsOptions 

func AsOptions() PrepareDecorator

AsOptions returns a PrepareDecorator that sets the HTTP method to OPTIONS.

func AsPatch 

func AsPatch() PrepareDecorator

AsPatch returns a PrepareDecorator that sets the HTTP method to PATCH.

func AsPost 

func AsPost() PrepareDecorator

AsPost returns a PrepareDecorator that sets the HTTP method to POST.

func AsPut 

func AsPut() PrepareDecorator

AsPut returns a PrepareDecorator that sets the HTTP method to PUT.

func WithBaseURL 

func WithBaseURL(baseURL string) PrepareDecorator

WithBaseURL returns a PrepareDecorator that populates the http.Request with a url.URL constructed from the supplied baseUrl.

Example

Create a request for a supplied base URL and path 

r, err := Prepare(&http.Request{},
	WithBaseURL("https://microsoft.com/a/b/c/"))
if err != nil {
	fmt.Printf("ERROR: %v\n", err)
} else {
	fmt.Println(r.URL)
}

Output:

https://microsoft.com/a/b/c/
Example (Second) 
_, err := Prepare(&http.Request{}, WithBaseURL(":"))
fmt.Println(err)

Output:

parse :: missing protocol scheme

func WithBearerAuthorization 

func WithBearerAuthorization(token string) PrepareDecorator

WithBearerAuthorization returns a PrepareDecorator that adds an HTTP Authorization header whose value is "Bearer " followed by the supplied token.

func WithBool 

func WithBool(v bool) PrepareDecorator

WithBool returns a PrepareDecorator that encodes the passed bool into the body of the request and sets the Content-Length header.

func WithCustomBaseURL 

func WithCustomBaseURL(baseURL string, urlParameters map[string]interface{}) PrepareDecorator

WithCustomBaseURL returns a PrepareDecorator that replaces brace-enclosed keys within the request base URL (i.e., http.Request.URL) with the corresponding values from the passed map.

Example 
r, err := Prepare(&http.Request{},
	WithCustomBaseURL("https://{account}.{service}.core.windows.net/",
		map[string]interface{}{
			"account": "myaccount",
			"service": "blob",
		}))
if err != nil {
	fmt.Printf("ERROR: %v\n", err)
} else {
	fmt.Println(r.URL)
}

Output:

https://myaccount.blob.core.windows.net/
Example (Second) 
_, err := Prepare(&http.Request{},
	WithCustomBaseURL(":", map[string]interface{}{}))
fmt.Println(err)

Output:

parse :: missing protocol scheme

func WithEscapedPathParameters 

func WithEscapedPathParameters(path string, pathParameters map[string]interface{}) PrepareDecorator

WithEscapedPathParameters returns a PrepareDecorator that replaces brace-enclosed keys within the request path (i.e., http.Request.URL.Path) with the corresponding values from the passed map. The values will be escaped (aka URL encoded) before insertion into the path.

Example

Create a request from a path with escaped parameters 

params := map[string]interface{}{
	"param1": "a b c",
	"param2": "d e f",
}
r, err := Prepare(&http.Request{},
	WithBaseURL("https://microsoft.com/"),
	WithEscapedPathParameters("/{param1}/b/{param2}/", params))
if err != nil {
	fmt.Printf("ERROR: %v\n", err)
} else {
	fmt.Println(r.URL)
}

Output:

https://microsoft.com/a+b+c/b/d+e+f/

func WithFile 

func WithFile(f io.ReadCloser) PrepareDecorator

WithFile returns a PrepareDecorator that sends file in request body.

func WithFloat32 

func WithFloat32(v float32) PrepareDecorator

WithFloat32 returns a PrepareDecorator that encodes the passed float32 into the body of the request and sets the Content-Length header.

func WithFloat64 

func WithFloat64(v float64) PrepareDecorator

WithFloat64 returns a PrepareDecorator that encodes the passed float64 into the body of the request and sets the Content-Length header.

func WithFormData 

func WithFormData(v url.Values) PrepareDecorator

WithFormData returns a PrepareDecoratore that "URL encodes" (e.g., bar=baz&foo=quux) into the http.Request body.

Example

Create a request whose Body is the JSON encoding of a structure 

v := url.Values{}
v.Add("name", "Rob Pike")
v.Add("age", "42")

r, err := Prepare(&http.Request{},
	WithFormData(v))
if err != nil {
	fmt.Printf("ERROR: %v\n", err)
}

b, err := ioutil.ReadAll(r.Body)
if err != nil {
	fmt.Printf("ERROR: %v\n", err)
} else {
	fmt.Printf("Request Body contains %s\n", string(b))
}

Output:

Request Body contains age=42&name=Rob+Pike

func WithHeader 

func WithHeader(header string, value string) PrepareDecorator

WithHeader returns a PrepareDecorator that sets the specified HTTP header of the http.Request to the passed value. It canonicalizes the passed header name (via http.CanonicalHeaderKey) before adding the header.

Example

Create a request with a custom HTTP header 

r, err := Prepare(&http.Request{},
	WithBaseURL("https://microsoft.com/a/b/c/"),
	WithHeader("x-foo", "bar"))
if err != nil {
	fmt.Printf("ERROR: %v\n", err)
} else {
	fmt.Printf("Header %s=%s\n", "x-foo", r.Header.Get("x-foo"))
}

Output:

Header x-foo=bar

func WithHeaders 

func WithHeaders(headers map[string]interface{}) PrepareDecorator

WithHeaders returns a PrepareDecorator that sets the specified HTTP headers of the http.Request to the passed value. It canonicalizes the passed headers name (via http.CanonicalHeaderKey) before adding them.

func WithInt32 

func WithInt32(v int32) PrepareDecorator

WithInt32 returns a PrepareDecorator that encodes the passed int32 into the body of the request and sets the Content-Length header.

func WithInt64 

func WithInt64(v int64) PrepareDecorator

WithInt64 returns a PrepareDecorator that encodes the passed int64 into the body of the request and sets the Content-Length header.

func WithJSON 

func WithJSON(v interface{}) PrepareDecorator

WithJSON returns a PrepareDecorator that encodes the data passed as JSON into the body of the request and sets the Content-Length header.

Example

Create a request whose Body is the JSON encoding of a structure 

t := mocks.T{Name: "Rob Pike", Age: 42}

r, err := Prepare(&http.Request{},
	WithJSON(&t))
if err != nil {
	fmt.Printf("ERROR: %v\n", err)
}

b, err := ioutil.ReadAll(r.Body)
if err != nil {
	fmt.Printf("ERROR: %v\n", err)
} else {
	fmt.Printf("Request Body contains %s\n", string(b))
}

Output:

Request Body contains {"name":"Rob Pike","age":42}

func WithMethod 

func WithMethod(method string) PrepareDecorator

WithMethod returns a PrepareDecorator that sets the HTTP method of the passed request. The decorator does not validate that the passed method string is a known HTTP method.

func WithMultiPartFormData 

func WithMultiPartFormData(formDataParameters map[string]interface{}) PrepareDecorator

WithMultiPartFormData returns a PrepareDecoratore that "URL encodes" (e.g., bar=baz&foo=quux) form parameters into the http.Request body.

func WithNothing 

func WithNothing() PrepareDecorator

WithNothing returns a "do nothing" PrepareDecorator that makes no changes to the passed http.Request.

func WithPath 

func WithPath(path string) PrepareDecorator

WithPath returns a PrepareDecorator that adds the supplied path to the request URL. If the path is absolute (that is, it begins with a "/"), it replaces the existing path.

func WithPathParameters 

func WithPathParameters(path string, pathParameters map[string]interface{}) PrepareDecorator

WithPathParameters returns a PrepareDecorator that replaces brace-enclosed keys within the request path (i.e., http.Request.URL.Path) with the corresponding values from the passed map.

Example

Create a request from a path with parameters 

params := map[string]interface{}{
	"param1": "a",
	"param2": "c",
}
r, err := Prepare(&http.Request{},
	WithBaseURL("https://microsoft.com/"),
	WithPathParameters("/{param1}/b/{param2}/", params))
if err != nil {
	fmt.Printf("ERROR: %v\n", err)
} else {
	fmt.Println(r.URL)
}

Output:

https://microsoft.com/a/b/c/

func WithQueryParameters 

func WithQueryParameters(queryParameters map[string]interface{}) PrepareDecorator

WithQueryParameters returns a PrepareDecorators that encodes and applies the query parameters given in the supplied map (i.e., key=value).

Example

Create a request with query parameters 

params := map[string]interface{}{
	"q1": "value1",
	"q2": "value2",
}
r, err := Prepare(&http.Request{},
	WithBaseURL("https://microsoft.com/"),
	WithPath("/a/b/c/"),
	WithQueryParameters(params))
if err != nil {
	fmt.Printf("ERROR: %v\n", err)
} else {
	fmt.Println(r.URL)
}

Output:

https://microsoft.com/a/b/c/?q1=value1&q2=value2

func WithString 

func WithString(v string) PrepareDecorator

WithString returns a PrepareDecorator that encodes the passed string into the body of the request and sets the Content-Length header.

func WithUserAgent 

func WithUserAgent(ua string) PrepareDecorator

WithUserAgent returns a PrepareDecorator that adds an HTTP User-Agent header whose value is the passed string.

type Preparer 

type Preparer interface {
	Prepare(*http.Request) (*http.Request, error)
}

Preparer is the interface that wraps the Prepare method.

Prepare accepts and possibly modifies an http.Request (e.g., adding Headers). Implementations must ensure to not share or hold per-invocation state since Preparers may be shared and re-used.

func CreatePreparer 

func CreatePreparer(decorators ...PrepareDecorator) Preparer

CreatePreparer creates, decorates, and returns a Preparer. Without decorators, the returned Preparer returns the passed http.Request unmodified. Preparers are safe to share and re-use.

Example

Create a sequence of three Preparers that build up the URL path. 

p := CreatePreparer(
	WithBaseURL("https://microsoft.com/"),
	WithPath("a"),
	WithPath("b"),
	WithPath("c"))
r, err := p.Prepare(&http.Request{})
if err != nil {
	fmt.Printf("ERROR: %v\n", err)
} else {
	fmt.Println(r.URL)
}

Output:

https://microsoft.com/a/b/c
Example (Chain)

Create and chain separate Preparers 

params := map[string]interface{}{
	"param1": "a",
	"param2": "c",
}

p := CreatePreparer(WithBaseURL("https://microsoft.com/"))
p = DecoratePreparer(p, WithPathParameters("/{param1}/b/{param2}/", params))

r, err := p.Prepare(&http.Request{})
if err != nil {
	fmt.Printf("ERROR: %v\n", err)
} else {
	fmt.Println(r.URL)
}

Output:

https://microsoft.com/a/b/c/
Example (Multiple)

Create and apply separate Preparers 

params := map[string]interface{}{
	"param1": "a",
	"param2": "c",
}

p1 := CreatePreparer(WithBaseURL("https://microsoft.com/"))
p2 := CreatePreparer(WithPathParameters("/{param1}/b/{param2}/", params))

r, err := p1.Prepare(&http.Request{})
if err != nil {
	fmt.Printf("ERROR: %v\n", err)
}

r, err = p2.Prepare(r)
if err != nil {
	fmt.Printf("ERROR: %v\n", err)
} else {
	fmt.Println(r.URL)
}

Output:

https://microsoft.com/a/b/c/

func DecoratePreparer 

func DecoratePreparer(p Preparer, decorators ...PrepareDecorator) Preparer

DecoratePreparer accepts a Preparer and a, possibly empty, set of PrepareDecorators, which it applies to the Preparer. Decorators are applied in the order received, but their affect upon the request depends on whether they are a pre-decorator (change the http.Request and then pass it along) or a post-decorator (pass the http.Request along and alter it on return).

type PreparerFunc 

type PreparerFunc func(*http.Request) (*http.Request, error)

PreparerFunc is a method that implements the Preparer interface.

func (PreparerFunc) Prepare 

func (pf PreparerFunc) Prepare(r *http.Request) (*http.Request, error)

Prepare implements the Preparer interface on PreparerFunc.

type RespondDecorator 

type RespondDecorator func(Responder) Responder

RespondDecorator takes and possibly decorates, by wrapping, a Responder. Decorators may react to the http.Response and pass it along or, first, pass the http.Response along then react.

func ByClosing 

func ByClosing() RespondDecorator

ByClosing returns a RespondDecorator that first invokes the passed Responder after which it closes the response body. Since the passed Responder is invoked prior to closing the response body, the decorator may occur anywhere within the set.

func ByClosingIfError 

func ByClosingIfError() RespondDecorator

ByClosingIfError returns a RespondDecorator that first invokes the passed Responder after which it closes the response if the passed Responder returns an error and the response body exists.

func ByCopying 

func ByCopying(b *bytes.Buffer) RespondDecorator

ByCopying copies the contents of the http.Response Body into the passed bytes.Buffer as the Body is read.

func ByDiscardingBody 

func ByDiscardingBody() RespondDecorator

ByDiscardingBody returns a RespondDecorator that first invokes the passed Responder after which it copies the remaining bytes (if any) in the response body to ioutil.Discard. Since the passed Responder is invoked prior to discarding the response body, the decorator may occur anywhere within the set.

func ByIgnoring 

func ByIgnoring() RespondDecorator

ByIgnoring returns a RespondDecorator that ignores the passed http.Response passing it unexamined to the next RespondDecorator.

func ByUnmarshallingJSON 

func ByUnmarshallingJSON(v interface{}) RespondDecorator

ByUnmarshallingJSON returns a RespondDecorator that decodes a JSON document returned in the response Body into the value pointed to by v.

Example 
c := `
	{
		"name" : "Rob Pike",
		"age"  : 42
	}
	`

type V struct {
	Name string `json:"name"`
	Age  int    `json:"age"`
}

v := &V{}

Respond(mocks.NewResponseWithContent(c),
	ByUnmarshallingJSON(v),
	ByClosing())

fmt.Printf("%s is %d years old\n", v.Name, v.Age)

Output:

Rob Pike is 42 years old

func ByUnmarshallingXML 

func ByUnmarshallingXML(v interface{}) RespondDecorator

ByUnmarshallingXML returns a RespondDecorator that decodes a XML document returned in the response Body into the value pointed to by v.

Example 
c := `<?xml version="1.0" encoding="UTF-8"?>
	<Person>
	  <Name>Rob Pike</Name>
	  <Age>42</Age>
	</Person>`

type V struct {
	Name string `xml:"Name"`
	Age  int    `xml:"Age"`
}

v := &V{}

Respond(mocks.NewResponseWithContent(c),
	ByUnmarshallingXML(v),
	ByClosing())

fmt.Printf("%s is %d years old\n", v.Name, v.Age)

Output:

Rob Pike is 42 years old

func WithErrorUnlessOK 

func WithErrorUnlessOK() RespondDecorator

WithErrorUnlessOK returns a RespondDecorator that emits an error if the response StatusCode is anything other than HTTP 200.

Example 
r := mocks.NewResponse()
r.Request = mocks.NewRequest()

// Respond and leave the response body open (for a subsequent responder to close)
err := Respond(r,
	WithErrorUnlessOK(),
	ByDiscardingBody(),
	ByClosingIfError())

if err == nil {
	fmt.Printf("%s of %s returned HTTP 200", r.Request.Method, r.Request.URL)

	// Complete handling the response and close the body
	Respond(r,
		ByDiscardingBody(),
		ByClosing())
}

Output:

GET of https://microsoft.com/a/b/c/ returned HTTP 200

func WithErrorUnlessStatusCode 

func WithErrorUnlessStatusCode(codes ...int) RespondDecorator

WithErrorUnlessStatusCode returns a RespondDecorator that emits an error unless the response StatusCode is among the set passed. On error, response body is fully read into a buffer and presented in the returned error, as well as in the response body.

type Responder 

type Responder interface {
	Respond(*http.Response) error
}

Responder is the interface that wraps the Respond method.

Respond accepts and reacts to an http.Response. Implementations must ensure to not share or hold state since Responders may be shared and re-used.

func CreateResponder 

func CreateResponder(decorators ...RespondDecorator) Responder

CreateResponder creates, decorates, and returns a Responder. Without decorators, the returned Responder returns the passed http.Response unmodified. Responders may or may not be safe to share and re-used: It depends on the applied decorators. For example, a standard decorator that closes the response body is fine to share whereas a decorator that reads the body into a passed struct is not.

To prevent memory leaks, ensure that at least one Responder closes the response body.

func DecorateResponder 

func DecorateResponder(r Responder, decorators ...RespondDecorator) Responder

DecorateResponder accepts a Responder and a, possibly empty, set of RespondDecorators, which it applies to the Responder. Decorators are applied in the order received, but their affect upon the request depends on whether they are a pre-decorator (react to the http.Response and then pass it along) or a post-decorator (pass the http.Response along and then react).

type ResponderFunc 

type ResponderFunc func(*http.Response) error

ResponderFunc is a method that implements the Responder interface.

func (ResponderFunc) Respond 

func (rf ResponderFunc) Respond(r *http.Response) error

Respond implements the Responder interface on ResponderFunc.

type Response 

type Response struct {
	*http.Response `json:"-"`
}

Response serves as the base for all responses from generated clients. It provides access to the last http.Response.

type RetriableRequest 

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

RetriableRequest provides facilities for retrying an HTTP request.

func NewRetriableRequest 

func NewRetriableRequest(req *http.Request) *RetriableRequest

NewRetriableRequest returns a wrapper around an HTTP request that support retry logic.

func (*RetriableRequest) Prepare 

func (rr *RetriableRequest) Prepare() (err error)

Prepare signals that the request is about to be sent.

func (*RetriableRequest) Request 

func (rr *RetriableRequest) Request() *http.Request

Request returns the wrapped HTTP request.

type SendDecorator 

type SendDecorator func(Sender) Sender

SendDecorator takes and possibily decorates, by wrapping, a Sender. Decorators may affect the http.Request and pass it along or, first, pass the http.Request along then react to the http.Response result.

func AfterDelay 

func AfterDelay(d time.Duration) SendDecorator

AfterDelay returns a SendDecorator that delays for the passed time.Duration before invoking the Sender. The delay may be terminated by closing the optional channel on the http.Request. If canceled, no further Senders are invoked.

func AsIs 

func AsIs() SendDecorator

AsIs returns a SendDecorator that invokes the passed Sender without modifying the http.Request.

func DoCloseIfError 

func DoCloseIfError() SendDecorator

DoCloseIfError returns a SendDecorator that first invokes the passed Sender after which it closes the response if the passed Sender returns an error and the response body exists.

func DoErrorIfStatusCode 

func DoErrorIfStatusCode(codes ...int) SendDecorator

DoErrorIfStatusCode returns a SendDecorator that emits an error if the response StatusCode is among the set passed. Since these are artificial errors, the response body may still require closing.

Example 
client := mocks.NewSender()
client.AppendAndRepeatResponse(mocks.NewResponseWithStatus("204 NoContent", http.StatusNoContent), 10)

// Chain decorators to retry the request, up to five times, if the status code is 204
r, _ := SendWithSender(client, mocks.NewRequest(),
	DoErrorIfStatusCode(http.StatusNoContent),
	DoCloseIfError(),
	DoRetryForAttempts(5, time.Duration(0)))

Respond(r,
	ByDiscardingBody(),
	ByClosing())

fmt.Printf("Retry stopped after %d attempts with code %s", client.Attempts(), r.Status)

Output:

Retry stopped after 5 attempts with code 204 NoContent

func DoErrorUnlessStatusCode 

func DoErrorUnlessStatusCode(codes ...int) SendDecorator

DoErrorUnlessStatusCode returns a SendDecorator that emits an error unless the response StatusCode is among the set passed. Since these are artificial errors, the response body may still require closing.

func DoPollForStatusCodes 

func DoPollForStatusCodes(duration time.Duration, delay time.Duration, codes ...int) SendDecorator

DoPollForStatusCodes returns a SendDecorator that polls if the http.Response contains one of the passed status codes. It expects the http.Response to contain a Location header providing the URL at which to poll (using GET) and will poll until the time passed is equal to or greater than the supplied duration. It will delay between requests for the duration specified in the RetryAfter header or, if the header is absent, the passed delay. Polling may be canceled by closing the optional channel on the http.Request.

func DoRetryForAttempts 

func DoRetryForAttempts(attempts int, backoff time.Duration) SendDecorator

DoRetryForAttempts returns a SendDecorator that retries a failed request for up to the specified number of attempts, exponentially backing off between requests using the supplied backoff time.Duration (which may be zero). Retrying may be canceled by closing the optional channel on the http.Request.

Example 
client := mocks.NewSender()
client.SetAndRepeatError(fmt.Errorf("Faux Error"), 10)

// Retry with backoff -- ensure returned Bodies are closed
r, _ := SendWithSender(client, mocks.NewRequest(),
	DoCloseIfError(),
	DoRetryForAttempts(5, time.Duration(0)))

Respond(r,
	ByDiscardingBody(),
	ByClosing())

fmt.Printf("Retry stopped after %d attempts", client.Attempts())

Output:

Retry stopped after 5 attempts

func DoRetryForDuration 

func DoRetryForDuration(d time.Duration, backoff time.Duration) SendDecorator

DoRetryForDuration returns a SendDecorator that retries the request until the total time is equal to or greater than the specified duration, exponentially backing off between requests using the supplied backoff time.Duration (which may be zero). Retrying may be canceled by closing the optional channel on the http.Request.

func DoRetryForStatusCodes 

func DoRetryForStatusCodes(attempts int, backoff time.Duration, codes ...int) SendDecorator

DoRetryForStatusCodes returns a SendDecorator that retries for specified statusCodes for up to the specified number of attempts, exponentially backing off between requests using the supplied backoff time.Duration (which may be zero). Retrying may be canceled by closing the optional channel on the http.Request.

func WithLogging 

func WithLogging(logger *log.Logger) SendDecorator

WithLogging returns a SendDecorator that implements simple before and after logging of the request.

type Sender 

type Sender interface {
	Do(*http.Request) (*http.Response, error)
}

Sender is the interface that wraps the Do method to send HTTP requests.

The standard http.Client conforms to this interface.

func CreateSender 

func CreateSender(decorators ...SendDecorator) Sender

CreateSender creates, decorates, and returns, as a Sender, the default http.Client.

func DecorateSender 

func DecorateSender(s Sender, decorators ...SendDecorator) Sender

DecorateSender accepts a Sender and a, possibly empty, set of SendDecorators, which is applies to the Sender. Decorators are applied in the order received, but their affect upon the request depends on whether they are a pre-decorator (change the http.Request and then pass it along) or a post-decorator (pass the http.Request along and react to the results in http.Response).

type SenderFunc 

type SenderFunc func(*http.Request) (*http.Response, error)

SenderFunc is a method that implements the Sender interface.

func (SenderFunc) Do 

func (sf SenderFunc) Do(r *http.Request) (*http.Response, error)

Do implements the Sender interface on SenderFunc.

Source Files

View all Source files

Directories

Path Synopsis
cmd
Package azure provides Azure-specific implementations used with AutoRest.
 Package azure provides Azure-specific implementations used with AutoRest.
auth
cli
example
Package date provides time.Time derivatives that conform to the Swagger.io (https://swagger.io/) defined date formats: Date and DateTime.
 Package date provides time.Time derivatives that conform to the Swagger.io (https://swagger.io/) defined date formats: Date and DateTime.
Package mocks provides mocks and helpers used in testing.
 Package mocks provides mocks and helpers used in testing.
Package to provides helpers to ease working with pointer values of marshalled structures.
 Package to provides helpers to ease working with pointer values of marshalled structures.
Package validation provides methods for validating parameter value using reflection.
 Package validation provides methods for validating parameter value using reflection.

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