xhttp

package
v1.2.0 Latest Latest
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 Go to latest Published: Jul 15, 2019 License: Apache-2.0 Imports: 21 Imported by: 0

Documentation

Overview

Package xhttp provides extended functionality for net/http and go-kit's transport/http packages

Index

Constants

View Source 
const (
	DefaultMaxRedirects = 10
)
View Source 
const DefaultRetryInterval = time.Second

Variables

View Source 
var ErrBufferedWriterClosed = errors.New("BufferedWriter has been closed")

Functions

func ApplyURLParser 

func ApplyURLParser(parser func(string) (*url.URL, error), values ...string) ([]*url.URL, error)

ApplyURLParser applies a given URL parser, such as url.Parse or url.ParseRequestURI, to zero or more strings. The resulting slice is ordered the same as the values. Any error halts parsing of subsequent values.

func Busy 

func Busy(maxTransactions int) func(http.Handler) http.Handler

Busy creates an Alice-style constructor that limits the number of HTTP transactions handled by decorated handlers. The decorated handler blocks waiting on a semaphore until the request's context is canceled. If a transaction is not allowed to proceed, http.StatusServiceUnavailable.

func CheckRedirect 

func CheckRedirect(p RedirectPolicy) func(*http.Request, []*http.Request) error

CheckRedirect produces a redirect policy function given a policy descriptor

func DefaultShouldRetry 

func DefaultShouldRetry(err error) bool

DefaultShouldRetry is the default retry predicate. It returns true if and only if err exposes a Temporary() bool method and that method returns true. That means, for example, that for a net.DNSError with the temporary flag set to true this predicate also returns true.

func DefaultShouldRetryStatus added in v1.1.0 

func DefaultShouldRetryStatus(status int) bool

DefaultShouldRetryStatus is the default retry predicate. It returns false on all status codes aka. it will never retry

func EnsureRewindable 

func EnsureRewindable(r *http.Request) error

EnsureRewindable configures the given request's contents to be restreamed in the event of a redirect or other arbitrary code that must resubmit a request. If this function is successful, Rewind can be used to rewind the request.

If a GetBody function is already present on the request, this function does nothing as the given request is already rewindable. Additionally, if there is no Body on the request, this function does nothing as there's no body to rewind.

func GetErrorEncoder 

func GetErrorEncoder(ctx context.Context) gokithttp.ErrorEncoder

GetErrorEncoder returns the go-kit HTTP ErrorEncoder associated with the context. If no encoder is present within the context, DefaultErrorEncoder is returned.

func NewRewind 

func NewRewind(r io.Reader) (io.ReadCloser, func() (io.ReadCloser, error), error)

NewRewind extracts all remaining bytes from an io.Reader, then uses NewRewindableBytes to produce a body and a get body function. If any error occurred during reading, that error is returned and the other return values will be nil.

This function performs certain optimizations on the returned body and get body function. If r implements io.Seeker, then a get body function that simply invokes Seek(0, 0) is used. Additionally, this function honors the case where r implements io.Closer, preserving its Close() semantics.

func NewRewindBytes 

func NewRewindBytes(b []byte) (io.ReadCloser, func() (io.ReadCloser, error))

NewRewindBytes produces both an io.ReadCloser that returns the given bytes and a function that produces a new io.ReadCloser that returns those same bytes. Both return values from this function are appropriate for http.Request.Body and http.Request.GetBody, respectively.

func NewServer 

func NewServer(o ServerOptions) *http.Server

NewServer creates a Server from a supplied set of options.

func NewServerConnStateLogger 

func NewServerConnStateLogger(logger log.Logger) func(net.Conn, http.ConnState)

NewServerConnStateLogger adapts a go-kit Logger onto a connection state handler appropriate for http.Server.ConnState.

func NewServerLogger 

func NewServerLogger(logger log.Logger) *stdlog.Logger

NewServerLogger adapts a go-kit Logger onto a golang Logger in a way that is appropriate for http.Server.ErrorLog.

func NewStarter 

func NewStarter(o StartOptions, s httpServer) func() error

NewStarter returns a starter closure for the given HTTP server. The start options are first applied to the server instance, and the server instance must not have already been started prior to invoking this method.

The returned closure will invoke the correct method on the server to start it, e.g. Serve, ServeTLS, etc. The selection of which server method is based on the options. For example, if CertificateFile and KeyFile are set, either of the xxxTLS methods will be invoked based on whether there is a Listener configured.

Note: tlsConfig is expected to already be set

func NilConstructor 

func NilConstructor(next http.Handler) http.Handler

NilConstructor is an Alice-style decorator for http.Handler instances that does no decoration, i.e. it simply returns its next handler unmodified. This is useful in cases where returning nil from configuration is undesireable. Configuration code can always return a non-nil constructor, using this function in cases where no decoration has been configured.

func RetryTransactor 

func RetryTransactor(o RetryOptions, next func(*http.Request) (*http.Response, error)) func(*http.Request) (*http.Response, error)

RetryTransactor returns an HTTP transactor function, of the same signature as http.Client.Do, that retries a certain number of times. Note that net/http.RoundTripper.RoundTrip also is of this signature, so this decorator can be used with a RoundTripper or an http.Client equally well.

If o.Retries is nonpositive, next is returned undecorated.

func Rewind 

func Rewind(r *http.Request) error

Rewind prepares a request body to be replayed. If a GetBody function is present, that function is invoked. An error is returned if this function could not rewind the request.

func ServerKey 

func ServerKey() interface{}

ServerKey returns the contextual logging key for the server name

func StaticHeaders 

func StaticHeaders(extra http.Header) func(http.Handler) http.Handler

StaticHeaders returns an Alice-style constructor that emits a static set of headers into every response. If the set of headers is empty, the constructor does no decoration.

func WithClient 

func WithClient(ctx context.Context, c Client) context.Context

WithClient associates an HTTP Client with the context. If the supplied client is nil, the supplied context is returned as is.

func WithErrorEncoder 

func WithErrorEncoder(ctx context.Context, ee gokithttp.ErrorEncoder) context.Context

WithErrorEncoder associates a go-kit ErrorEncoder with the context. If the supplied ErrorEncoder is nil, the supplied context is returned as is.

func WriteError 

func WriteError(response http.ResponseWriter, code int, value interface{}) (int, error)

WriteError provides print-style functionality for writing a JSON message as a response. No format parameters are used. The value parameter is subjected to the default stringizing rules of the fmt package.

func WriteErrorf 

func WriteErrorf(response http.ResponseWriter, code int, format string, parameters ...interface{}) (int, error)

WriteErrorf provides printf-style functionality for writing out the results of some operation. The response status code is set to code, and a JSON message of the form {"code": %d, "message": "%s"} is written as the response body. fmt.Sprintf is used to turn the format and parameters into a single string for the message.

Although the typical use case for this function is to return a JSON error, this function can be used for non-error responses.

Types

type BufferedWriter 

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

BufferedWriter is a closeable http.ResponseWriter that holds all written response information in memory. The zero value of this type is a fully usable writer.

The http.ResponseWriter methods of this type are not safe for concurrent execution. However, it is safe to invoke Close concurrently with the other methods.

Once closed, future Write and WriteTo calls will return errors. This type is ideal for http.Handler code that should be Buffered and optionally discarded depending on other logic.

func (*BufferedWriter) Close 

func (bw *BufferedWriter) Close() error

Close closes this writer. Once closed, this writer will reject writes with an error. This method is idempotent, and will return an error if called more than once on a given writer instance.

func (*BufferedWriter) Header 

func (bw *BufferedWriter) Header() http.Header

Header returns the HTTP header to write to the response. This method is unaffected by the close state.

func (*BufferedWriter) Write 

func (bw *BufferedWriter) Write(p []byte) (int, error)

Write buffers content for later writing to a real http.ResponseWriter. If this writer is closed, this method returns a count of 0 with an error.

func (*BufferedWriter) WriteHeader 

func (bw *BufferedWriter) WriteHeader(code int)

WriteHeader sets a status code and in most other ways behaves as the standard net/http ResponseWriter. This method is idempotent. Only the first invocation will have an effect. If this writer is closed, this method has no effect.

func (*BufferedWriter) WriteTo 

func (bw *BufferedWriter) WriteTo(response http.ResponseWriter) (int, error)

WriteTo transfers this writer's state to the given ResponseWriter. This method will only take effect once. Once this method has been invoked successfully, this writer instance is closed and will reject future writes (including this method).

type Client 

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

Client is an interface implemented by net/http.Client

func GetClient 

func GetClient(ctx context.Context) Client

GetClient returns the HTTP client associated with the context. If no client is present in the context, http.DefaultClient is returned.

type Constant 

type Constant struct {
	Code   int
	Header http.Header
	Body   []byte
}

Constant represents an http.Handler that writes prebuilt, constant information to the response writer.

func (Constant) ServeHTTP 

func (c Constant) ServeHTTP(response http.ResponseWriter, _ *http.Request)

ServeHTTP simply writes the configured information out to the response.

type Error 

type Error struct {
	Code   int
	Header http.Header
	Text   string
}

Error is an HTTP-specific carrier of error information. In addition to implementing error, this type also implements go-kit's StatusCoder and Headerer. The json.Marshaler interface is implemented so that the default go-kit error encoder will always emit a JSON message.

func (*Error) Error 

func (e *Error) Error() string

func (*Error) Headers 

func (e *Error) Headers() http.Header

func (*Error) MarshalJSON 

func (e *Error) MarshalJSON() ([]byte, error)

func (*Error) StatusCode 

func (e *Error) StatusCode() int

type ReadSeekerCloser 

type ReadSeekerCloser interface {
	io.ReadSeeker
	io.Closer
}

ReadSeekerCloser combines the behavior of io.Reader, io.Seeker, and io.Closer. This package uses this interface for basic optimizations.

func NopCloser 

func NopCloser(rs io.ReadSeeker) ReadSeekerCloser

NopCloser is an analog of ioutil.NopCloser. This function preserves io.Seeker semantics in the returned instance. Additionally, if rs already implements io.Closer, this function returns rs as is.

type RedirectPolicy 

type RedirectPolicy struct {
	// Logger is the go-kit Logger used for logging.  If unset, the request context's logger is used.
	Logger log.Logger

	// MaxRedirects is the maximum number of redirects to follow.  If unset, DefaultMaxRedirects is used.
	MaxRedirects int

	// ExcludeHeaders is the blacklist of headers that should not be copied from previous requests.
	ExcludeHeaders []string
}

RedirectPolicy is the configurable policy for handling redirects

type RetryOptions 

type RetryOptions struct {
	// Logger is the go-kit logger to use.  Defaults to logging.DefaultLogger() if unset.
	Logger log.Logger

	// Retries is the count of retries.  If not positive, then no transactor decoration is performed.
	Retries int

	// Interval is the time between retries.  If not set, DefaultRetryInterval is used.
	Interval time.Duration

	// Sleep is function used to wait out a duration.  If unset, time.Sleep is used.
	Sleep func(time.Duration)

	// ShouldRetry is the retry predicate.  Defaults to DefaultShouldRetry if unset.
	ShouldRetry ShouldRetryFunc

	// ShouldRetryStatus is the retry predicate.  Defaults to DefaultShouldRetry if unset.
	ShouldRetryStatus ShouldRetryStatusFunc

	// Counter is the counter for total retries.  If unset, no metrics are collected on retries.
	Counter metrics.Counter

	// UpdateRequest provides the ability to update the request before it is sent. default is noop
	UpdateRequest func(*http.Request)
}

RetryOptions are the configuration options for a retry transactor

type ServerOptions 

type ServerOptions struct {
	// Logger is the go-kit Logger to use for server startup and error logging.  If not
	// supplied, logging.DefaultLogger() is used instead.
	Logger log.Logger `json:"-"`

	// Address is the bind address of the server.  If not supplied, defaults to the internal net/http default.
	Address string `json:"address,omitempty"`

	// ReadTimeout is the maximum duration for reading the entire request.  If not supplied, defaults to the
	// internal net/http default.
	ReadTimeout time.Duration `json:"readTimeout,omitempty"`

	// ReadHeaderTimeout is the amount of time allowed to read request headers.  If not supplied, defaults to
	// the internal net/http default.
	ReadHeaderTimeout time.Duration `json:"readHeaderTimeout,omitempty"`

	// WriteTimeout is the maximum duration before timing out writes of the response.  If not supplied, defaults
	// to the internal net/http default.
	WriteTimeout time.Duration `json:"writeTimeout,omitempty"`

	// IdleTimeout is the maximum amount of time to wait for the next request when keep-alives are enabled.
	// If not supplied, defaults to the internal net/http default.
	IdleTimeout time.Duration `json:"idleTimeout,omitempty"`

	// MaxHeaderBytes controls the maximum number of bytes the server will read parsing the request header's
	// keys and values.  If not supplied, defaults to the internal net/http default.
	MaxHeaderBytes int `json:"maxHeaderBytes,omitempty"`

	// Listener is the optional net.Listener to use.  If not supplied, the http.Server default
	// listener is used.
	Listener net.Listener `json:"-"`

	// DisableKeepAlives indicates whether the server should honor keep alives
	DisableKeepAlives bool `json:"disableKeepAlives,omitempty"`

	// CertificateFile is the HTTPS certificate file.  If both this field and KeyFile are set,
	// an HTTPS starter function is created.
	CertificateFile []string `json:"certificateFile,omitempty"`

	// KeyFile is the HTTPS key file.  If both this field and CertificateFile are set,
	// an HTTPS starter function is created.
	KeyFile []string `json:"keyFile,omitempty"`
}

ServerOptions describes the superset of options for both construction an http.Server and starting it.

func (*ServerOptions) StartOptions 

func (so *ServerOptions) StartOptions() StartOptions

StartOptions produces a StartOptions with the corresponding values from this ServerOptions

type ShouldRetryFunc 

type ShouldRetryFunc func(error) bool

ShouldRetryFunc is a predicate for determining if the error returned from an HTTP transaction should be retried.

type ShouldRetryStatusFunc added in v1.1.0 

type ShouldRetryStatusFunc func(int) bool

ShouldRetryStatusFunc is a predicate for determining if the status coded returned from an HTTP transaction should be retried.

type StartOptions 

type StartOptions struct {
	// Logger is the go-kit Logger to use for server startup and error logging.  If not
	// supplied, logging.DefaultLogger() is used instead.
	Logger log.Logger `json:"-"`

	// Listener is the optional net.Listener to use.  If not supplied, the http.Server default
	// listener is used.
	Listener net.Listener `json:"-"`

	// DisableKeepAlives indicates whether the server should honor keep alives
	DisableKeepAlives bool `json:"disableKeepAlives,omitempty"`

	// CertificateFile is the HTTPS certificate file(s).  If both this field and KeyFile are set,
	// an HTTPS starter function is created.
	CertificateFile []string `json:"certificateFile,omitempty"`

	// KeyFile is the HTTPS key file(s).  If both this field and CertificateFile are set,
	// an HTTPS starter function is created.
	KeyFile []string `json:"keyFile,omitempty"`
}

StartOptions represents the subset of server options that have to do with how an HTTP server is started.

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