vendor: update all dependencies to latest versions

vendor/github.com/ncw/go-acd/changes.go

@@ -0,0 +1,85 @@
+package acd
+
+import (
+	"encoding/json"
+	"io"
+	"net/http"
+)
+
+// ChangesService provides access to incemental changes in the Amazon Cloud Drive API.
+//
+// See: https://developer.amazon.com/public/apis/experience/cloud-drive/content/changes
+type ChangesService struct {
+	client *Client
+}
+
+// A ChangeSet is collection of node changes as received from the Changes API
+type ChangeSet struct {
+	Checkpoint string  `json:"checkpoint"`
+	Nodes      []*Node `json:"nodes"`
+	Reset      bool    `json:"reset"`
+	StatusCode int     `json:"statusCode"`
+	End        bool    `json:"end"`
+}
+
+// ChangesOptions contains all possible arguments for the Changes API
+type ChangesOptions struct {
+	Checkpoint    string `json:"checkpoint,omitempty"`
+	ChunkSize     int    `json:"chunkSize,omitempty"`
+	MaxNodes      int    `json:"maxNodes,omitempty"`
+	IncludePurged bool   `json:"includePurged,omitempty,string"`
+}
+
+// GetChanges returns all the changes since opts.Checkpoint
+func (s *ChangesService) GetChanges(opts *ChangesOptions) ([]*ChangeSet, *http.Response, error) {
+	var changeSets []*ChangeSet
+	resp, err := s.GetChangesFunc(opts, func(cs *ChangeSet, err error) error {
+		if err != nil {
+			return err
+		}
+		changeSets = append(changeSets, cs)
+		return nil
+	})
+	return changeSets, resp, err
+}
+
+// GetChangesChan gets all the changes since opts.Checkpoint sending each ChangeSet to the channel.
+// The provided channel is closed before returning
+func (s *ChangesService) GetChangesChan(opts *ChangesOptions, ch chan<- *ChangeSet) (*http.Response, error) {
+	defer close(ch)
+
+	return s.GetChangesFunc(opts, func(cs *ChangeSet, err error) error {
+		if err != nil {
+			return err
+		}
+		ch <- cs
+		return nil
+	})
+}
+
+// GetChangesFunc gets all the changes since opts.Checkpoint and calls f with the ChangeSet or the error received.
+// If f returns a non nil value, GetChangesFunc exits and returns the given error.
+func (s *ChangesService) GetChangesFunc(opts *ChangesOptions, f func(*ChangeSet, error) error) (*http.Response, error) {
+	req, err := s.client.NewMetadataRequest("POST", "changes", opts)
+	if err != nil {
+		return nil, err
+	}
+	resp, err := s.client.Do(req, nil)
+	if err != nil {
+		return resp, err
+	}
+	defer resp.Body.Close()
+
+	decoder := json.NewDecoder(resp.Body)
+	for {
+		changeSet := &ChangeSet{}
+		err := decoder.Decode(&changeSet)
+		if err == io.EOF {
+			return resp, nil
+		}
+		err = f(changeSet, err)
+		if err != nil {
+			return resp, err
+		}
+	}
+}