Method loadAttachmentsData

db/attachment.go:211–241

Goes through a given attachments map, loads attachments (by their 'digest' properties) and adds 'data' properties containing the data. The data is added as raw []byte; the JSON marshaller will convert that to base64. If minRevpos is > 0, then only attachments that have been changed in a revision of

(attachments AttachmentsMeta, minRevpos int, docid string)

// If minRevpos is > 0, then only attachments that have been changed in a revision of that
// generation or later are loaded.
func (c *DatabaseCollection) loadAttachmentsData(attachments AttachmentsMeta, minRevpos int, docid string) (newAttachments AttachmentsMeta, err error) {
	newAttachments = attachments.ShallowCopy()

	for attachmentName, value := range newAttachments {
		meta := value.(map[string]interface{})
		revpos, ok := base.ToInt64(meta["revpos"])
		if ok && revpos >= int64(minRevpos) {
			digest, ok := meta["digest"]
			if !ok {
				return nil, base.RedactErrorf("Unable to load attachment for doc: %v with name: %v and revpos: %v due to missing digest field", base.UD(docid), base.UD(attachmentName), revpos)
			}
			digestStr, ok := digest.(string)
			if !ok {
				return nil, base.RedactErrorf("Unable to load attachment for doc: %v with name: %v and revpos: %v due to unexpected digest field: %v", base.UD(docid), base.UD(attachmentName), revpos, digest)
			}
			version, ok := GetAttachmentVersion(meta)
			if !ok {
				return nil, base.RedactErrorf("Unable to load attachment for doc: %v with name: %v, revpos: %v and digest: %v due to unexpected version value: %v", base.UD(docid), base.UD(attachmentName), revpos, digest, version)
			}
			attachmentKey := MakeAttachmentKey(version, docid, digestStr)
			data, err := c.GetAttachment(attachmentKey)
			if err != nil {
				return nil, err
			}
			meta["data"] = data
			delete(meta, "stub")
		}
	}

	return newAttachments, nil
}

// DeleteAttachmentVersion removes attachment versions from the AttachmentsMeta map specified.
func DeleteAttachmentVersion(attachments AttachmentsMeta) {