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Closes #11
This PR adds a `Msg.Read()` method which satisfies the `io.Reader` interface
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c001ac5b94
commit
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3 changed files with 78 additions and 1 deletions
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@ -32,8 +32,9 @@ Some of the features of this library:
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* [X] Support for common mail header field generation (Message-ID, Date, Bulk-Precedence, Priority, etc.)
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* [X] Reusing the same SMTP connection to send multiple mails
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* [X] Support for attachments and inline embeds
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* [X] Support for different encodings (existing but not fully tested)
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* [X] Support for different encodings
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* [X] Support sending mails via a local sendmail command
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* [X] Message object satisfies `io.WriteTo` and `io.Reader` interfaces
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go-mail works like a programatic email client and provides lots of methods and functionalities you would consider
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standard in a MUA.
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10
msg.go
10
msg.go
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@ -552,6 +552,16 @@ func (m *Msg) WriteToSendmailWithContext(ctx context.Context, sp string, a ...st
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return nil
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}
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// Read outputs the length of p into p to satisfy the io.Reader interface
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func (m *Msg) Read(p []byte) (int, error) {
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wbuf := bytes.Buffer{}
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_, err := m.WriteTo(&wbuf)
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if err != nil {
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return 0, fmt.Errorf("failed to write message to internal write buffer: %w", err)
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}
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return wbuf.Read(p)
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}
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// encodeString encodes a string based on the configured message encoder and the corresponding
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// charset for the Msg
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func (m *Msg) encodeString(s string) string {
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66
msg_test.go
66
msg_test.go
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@ -1272,3 +1272,69 @@ func TestMsg_multipleWrites(t *testing.T) {
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t.Errorf("second WriteTo() body does not contain unique string: %s", ts)
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}
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}
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// TestMsg_Read tests the Msg.Read method that implements the io.Reader interface
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func TestMsg_Read(t *testing.T) {
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tests := []struct {
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name string
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plen int
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}{
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{"P length is bigger than the mail", 32000},
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{"P length is smaller than the mail", 128},
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}
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m := NewMsg()
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m.SetBodyString(TypeTextPlain, "TEST123")
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wbuf := bytes.Buffer{}
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_, err := m.Write(&wbuf)
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if err != nil {
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t.Errorf("failed to write message into temporary buffer: %s", err)
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}
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elen := wbuf.Len()
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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p := make([]byte, tt.plen)
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n, err := m.Read(p)
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if err != nil {
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t.Errorf("failed to Read(): %s", err)
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}
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if n == 0 {
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t.Errorf("failed to Read() - received 0 bytes of data")
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}
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if tt.plen >= elen && n != elen {
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t.Errorf("failed to Read() - not all data received. Expected: %d, got: %d", elen, n)
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}
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if tt.plen < elen && n != tt.plen {
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t.Errorf("failed to Read() - full length of p wasn't filled with data. Expected: %d, got: %d",
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tt.plen, n)
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}
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})
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}
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}
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// TestMsg_Read_ioCopy tests the Msg.Read method using io.Copy
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func TestMsg_Read_ioCopy(t *testing.T) {
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wbuf1 := bytes.Buffer{}
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wbuf2 := bytes.Buffer{}
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m := NewMsg()
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m.SetBodyString(TypeTextPlain, "TEST123")
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// First we use WriteTo to have something to compare to
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_, err := m.WriteTo(&wbuf1)
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if err != nil {
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t.Errorf("failed to write body to buffer: %s", err)
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}
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// Then we write to wbuf2 via io.Copy
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n, err := io.Copy(&wbuf2, m)
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if err != nil {
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t.Errorf("failed to use io.Copy on Msg: %s", err)
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}
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if n != int64(wbuf1.Len()) {
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t.Errorf("message length of WriteTo and io.Copy differ. Expected: %d, got: %d", wbuf1.Len(), n)
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}
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if wbuf1.String() != wbuf2.String() {
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t.Errorf("message content of WriteTo and io.Copy differ")
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}
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}
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