Vendor dependencies
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// Code generated by smithy-go/middleware/generate.go DO NOT EDIT.
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package middleware
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import (
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"context"
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"fmt"
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)
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// InitializeInput wraps the input parameters for the InitializeMiddlewares to
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// consume. InitializeMiddleware may modify the parameter value before
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// forwarding it along to the next InitializeHandler.
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type InitializeInput struct {
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Parameters interface{}
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}
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// InitializeOutput provides the result returned by the next InitializeHandler.
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type InitializeOutput struct {
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Result interface{}
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}
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// InitializeHandler provides the interface for the next handler the
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// InitializeMiddleware will call in the middleware chain.
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type InitializeHandler interface {
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HandleInitialize(ctx context.Context, in InitializeInput) (
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out InitializeOutput, metadata Metadata, err error,
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)
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}
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// InitializeMiddleware provides the interface for middleware specific to the
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// initialize step. Delegates to the next InitializeHandler for further
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// processing.
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type InitializeMiddleware interface {
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// ID returns a unique ID for the middleware in the InitializeStep. The step does not
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// allow duplicate IDs.
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ID() string
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// HandleInitialize invokes the middleware behavior which must delegate to the next handler
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// for the middleware chain to continue. The method must return a result or
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// error to its caller.
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HandleInitialize(ctx context.Context, in InitializeInput, next InitializeHandler) (
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out InitializeOutput, metadata Metadata, err error,
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)
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}
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// InitializeMiddlewareFunc returns a InitializeMiddleware with the unique ID provided,
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// and the func to be invoked.
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func InitializeMiddlewareFunc(id string, fn func(context.Context, InitializeInput, InitializeHandler) (InitializeOutput, Metadata, error)) InitializeMiddleware {
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return initializeMiddlewareFunc{
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id: id,
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fn: fn,
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}
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}
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type initializeMiddlewareFunc struct {
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// Unique ID for the middleware.
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id string
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// Middleware function to be called.
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fn func(context.Context, InitializeInput, InitializeHandler) (
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InitializeOutput, Metadata, error,
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)
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}
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// ID returns the unique ID for the middleware.
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func (s initializeMiddlewareFunc) ID() string { return s.id }
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// HandleInitialize invokes the middleware Fn.
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func (s initializeMiddlewareFunc) HandleInitialize(ctx context.Context, in InitializeInput, next InitializeHandler) (
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out InitializeOutput, metadata Metadata, err error,
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) {
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return s.fn(ctx, in, next)
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}
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var _ InitializeMiddleware = (initializeMiddlewareFunc{})
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// InitializeStep provides the ordered grouping of InitializeMiddleware to be
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// invoked on a handler.
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type InitializeStep struct {
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head *decoratedInitializeHandler
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tail *decoratedInitializeHandler
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}
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// NewInitializeStep returns an InitializeStep ready to have middleware for
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// initialize added to it.
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func NewInitializeStep() *InitializeStep {
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return &InitializeStep{}
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}
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var _ Middleware = (*InitializeStep)(nil)
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// ID returns the unique ID of the step as a middleware.
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func (s *InitializeStep) ID() string {
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return "Initialize stack step"
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}
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// HandleMiddleware invokes the middleware by decorating the next handler
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// provided. Returns the result of the middleware and handler being invoked.
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//
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// Implements Middleware interface.
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func (s *InitializeStep) HandleMiddleware(ctx context.Context, in interface{}, next Handler) (
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out interface{}, metadata Metadata, err error,
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) {
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sIn := InitializeInput{
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Parameters: in,
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}
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wh := &initializeWrapHandler{next}
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if s.head == nil {
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res, metadata, err := wh.HandleInitialize(ctx, sIn)
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return res.Result, metadata, err
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}
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s.tail.Next = wh
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res, metadata, err := s.head.HandleInitialize(ctx, sIn)
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return res.Result, metadata, err
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}
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// Get retrieves the middleware identified by id. If the middleware is not present, returns false.
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func (s *InitializeStep) Get(id string) (InitializeMiddleware, bool) {
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found, _ := s.get(id)
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if found == nil {
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return nil, false
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}
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return found.With, true
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}
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// Add injects the middleware to the relative position of the middleware group.
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//
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// Add never returns an error. It used to for duplicate phases but this
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// behavior has since been removed as part of a performance optimization. The
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// return value from Add can be ignored.
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func (s *InitializeStep) Add(m InitializeMiddleware, pos RelativePosition) error {
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if s.head == nil {
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s.head = &decoratedInitializeHandler{nil, m}
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s.tail = s.head
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return nil
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}
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if pos == Before {
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s.head = &decoratedInitializeHandler{s.head, m}
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} else {
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tail := &decoratedInitializeHandler{nil, m}
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s.tail.Next = tail
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s.tail = tail
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}
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return nil
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}
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// Insert injects the middleware relative to an existing middleware ID.
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// Returns error if the original middleware does not exist, or the middleware
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// being added already exists.
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func (s *InitializeStep) Insert(m InitializeMiddleware, relativeTo string, pos RelativePosition) error {
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found, prev := s.get(relativeTo)
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if found == nil {
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return fmt.Errorf("not found: %s", m.ID())
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}
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if pos == Before {
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if prev == nil { // at the front
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s.head = &decoratedInitializeHandler{s.head, m}
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} else { // somewhere in the middle
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prev.Next = &decoratedInitializeHandler{found, m}
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}
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} else {
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if found.Next == nil { // at the end
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tail := &decoratedInitializeHandler{nil, m}
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s.tail.Next = tail
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s.tail = tail
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} else { // somewhere in the middle
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found.Next = &decoratedInitializeHandler{found.Next, m}
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}
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}
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return nil
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}
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// Swap removes the middleware by id, replacing it with the new middleware.
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// Returns the middleware removed, or error if the middleware to be removed
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// doesn't exist.
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func (s *InitializeStep) Swap(id string, m InitializeMiddleware) (InitializeMiddleware, error) {
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found, _ := s.get(id)
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if found == nil {
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return nil, fmt.Errorf("not found: %s", m.ID())
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}
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swapped := found.With
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found.With = m
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return swapped, nil
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}
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// Remove removes the middleware by id. Returns error if the middleware
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// doesn't exist.
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func (s *InitializeStep) Remove(id string) (InitializeMiddleware, error) {
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found, prev := s.get(id)
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if found == nil {
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return nil, fmt.Errorf("not found: %s", id)
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}
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if s.head == s.tail { // it's the only one
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s.head = nil
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s.tail = nil
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} else if found == s.head { // at the front
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s.head = s.head.Next.(*decoratedInitializeHandler)
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} else if found == s.tail { // at the end
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prev.Next = nil
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s.tail = prev
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} else {
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prev.Next = found.Next // somewhere in the middle
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}
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return found.With, nil
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}
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// List returns a list of the middleware in the step.
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func (s *InitializeStep) List() []string {
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var ids []string
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for h := s.head; h != nil; {
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ids = append(ids, h.With.ID())
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if h.Next == nil {
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break
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}
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// once executed, tail.Next of the list will be set to an
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// *initializeWrapHandler, make sure to check for that
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if hnext, ok := h.Next.(*decoratedInitializeHandler); ok {
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h = hnext
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} else {
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break
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}
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}
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return ids
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}
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// Clear removes all middleware in the step.
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func (s *InitializeStep) Clear() {
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s.head = nil
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s.tail = nil
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}
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func (s *InitializeStep) get(id string) (found, prev *decoratedInitializeHandler) {
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for h := s.head; h != nil; {
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if h.With.ID() == id {
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found = h
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return
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}
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prev = h
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if h.Next == nil {
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return
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}
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// once executed, tail.Next of the list will be set to an
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// *initializeWrapHandler
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h, _ = h.Next.(*decoratedInitializeHandler)
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}
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return
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}
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type initializeWrapHandler struct {
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Next Handler
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}
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var _ InitializeHandler = (*initializeWrapHandler)(nil)
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// HandleInitialize implements InitializeHandler, converts types and delegates to underlying
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// generic handler.
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func (w initializeWrapHandler) HandleInitialize(ctx context.Context, in InitializeInput) (
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out InitializeOutput, metadata Metadata, err error,
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) {
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res, metadata, err := w.Next.Handle(ctx, in.Parameters)
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return InitializeOutput{
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Result: res,
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}, metadata, err
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}
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type decoratedInitializeHandler struct {
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Next InitializeHandler
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With InitializeMiddleware
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}
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var _ InitializeHandler = (*decoratedInitializeHandler)(nil)
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func (h decoratedInitializeHandler) HandleInitialize(ctx context.Context, in InitializeInput) (
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out InitializeOutput, metadata Metadata, err error,
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) {
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return h.With.HandleInitialize(ctx, in, h.Next)
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}
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// InitializeHandlerFunc provides a wrapper around a function to be used as initializeMiddleware.
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type InitializeHandlerFunc func(context.Context, InitializeInput) (InitializeOutput, Metadata, error)
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// HandleInitialize calls the wrapped function with the provided arguments.
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func (f InitializeHandlerFunc) HandleInitialize(ctx context.Context, in InitializeInput) (InitializeOutput, Metadata, error) {
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return f(ctx, in)
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}
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var _ InitializeHandler = InitializeHandlerFunc(nil)
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