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Fix Attach/EmbedReader and implement Attach/EmbedReadSeeker
This PR addresses #110. `Msg.AttachReader()` would not output the attached file after consecutive writes (e.g. a write to a file and then send via Client). This PR fixes this behaviour by first reading the io.Reader into memory and then creating a new `bytes.Reader`, which does support seeking. In the writeFunc we then seek to position 0 after a successful `io.Copy`. This is probably not the most memory efficient way of handling this, but otherwise we'll have to break the `io.Reader` interface. Additionally, a new way of attaching/embedding files has been added: `Msg.AttachReadSeeker()` and `Msg.EmbedReadSeeker()` which take a ´io.ReadSeeker` as argument instead. These two methods will skip the reading into memory and make use of the `Seek` method of the corresponding interface instead.
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commit
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1 changed files with 39 additions and 5 deletions
44
msg.go
44
msg.go
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@ -719,6 +719,12 @@ func (m *Msg) AttachReader(n string, r io.Reader, o ...FileOption) {
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m.attachments = m.appendFile(m.attachments, f, o...)
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}
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// AttachReadSeeker adds an attachment File via io.ReadSeeker to the Msg
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func (m *Msg) AttachReadSeeker(n string, r io.ReadSeeker, o ...FileOption) {
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f := fileFromReadSeeker(n, r)
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m.attachments = m.appendFile(m.attachments, f, o...)
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}
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// AttachHTMLTemplate adds the output of a html/template.Template pointer as File attachment to the Msg
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func (m *Msg) AttachHTMLTemplate(n string, t *ht.Template, d interface{}, o ...FileOption) error {
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f, err := fileFromHTMLTemplate(n, t, d)
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@ -767,6 +773,12 @@ func (m *Msg) EmbedReader(n string, r io.Reader, o ...FileOption) {
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m.embeds = m.appendFile(m.embeds, f, o...)
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}
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// EmbedReadSeeker adds an embedded File from an io.ReadSeeker to the Msg
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func (m *Msg) EmbedReadSeeker(n string, r io.ReadSeeker, o ...FileOption) {
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f := fileFromReadSeeker(n, r)
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m.embeds = m.appendFile(m.embeds, f, o...)
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}
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// EmbedHTMLTemplate adds the output of a html/template.Template pointer as embedded File to the Msg
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func (m *Msg) EmbedHTMLTemplate(n string, t *ht.Template, d interface{}, o ...FileOption) error {
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f, err := fileFromHTMLTemplate(n, t, d)
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@ -1114,15 +1126,37 @@ func fileFromFS(n string) *File {
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// fileFromReader returns a File pointer from a given io.Reader
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func fileFromReader(n string, r io.Reader) *File {
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d, err := io.ReadAll(r)
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if err != nil {
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return &File{}
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}
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br := bytes.NewReader(d)
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return &File{
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Name: filepath.Base(n),
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Name: n,
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Header: make(map[string][]string),
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Writer: func(w io.Writer) (int64, error) {
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nb, err := io.Copy(w, r)
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if err != nil {
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return nb, err
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rb, cerr := io.Copy(w, br)
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if cerr != nil {
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return rb, cerr
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}
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return nb, nil
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_, cerr = br.Seek(0, io.SeekStart)
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return rb, cerr
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},
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}
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}
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// fileFromReadSeeker returns a File pointer from a given io.ReadSeeker
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func fileFromReadSeeker(n string, r io.ReadSeeker) *File {
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return &File{
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Name: n,
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Header: make(map[string][]string),
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Writer: func(w io.Writer) (int64, error) {
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rb, err := io.Copy(w, r)
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if err != nil {
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return rb, err
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}
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_, err = r.Seek(0, io.SeekStart)
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return rb, err
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},
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}
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}
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