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to compress the entire IMAP connection. tested with thunderbird, meli, k9, ios mail. the initial implementation had interoperability issues with some of these clients: if they write the deflate stream and flush in "partial mode", the go stdlib flate reader does not return any data (until there is an explicit zero-length "sync flush" block, or until the history/sliding window is full), blocking progress, resulting in clients closing the seemingly stuck connection after considering the connection timed out. this includes a coy of the flate package with a new reader that returns partially flushed blocks earlier. this also adds imap trace logging to imapclient.Conn, which was useful for debugging.
46 lines
978 B
Go
46 lines
978 B
Go
package imapserver
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import (
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"bufio"
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"io"
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"net"
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)
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// prefixConn is a net.Conn with a buffer from which the first reads are satisfied.
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// used for STARTTLS where already did a buffered read of initial TLS data.
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type prefixConn struct {
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prefix []byte
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net.Conn
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}
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func (c *prefixConn) Read(buf []byte) (int, error) {
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if len(c.prefix) > 0 {
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n := len(buf)
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if n > len(c.prefix) {
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n = len(c.prefix)
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}
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copy(buf[:n], c.prefix[:n])
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c.prefix = c.prefix[n:]
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if len(c.prefix) == 0 {
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c.prefix = nil
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}
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return n, nil
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}
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return c.Conn.Read(buf)
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}
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// xprefixConn returns either the original net.Conn passed as parameter, or returns
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// a *prefixConn returning the buffered data available in br followed data from the
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// net.Conn passed in.
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func xprefixConn(c net.Conn, br *bufio.Reader) net.Conn {
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n := br.Buffered()
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if n == 0 {
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return c
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}
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buf := make([]byte, n)
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_, err := io.ReadFull(c, buf)
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xcheckf(err, "get buffered data")
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return &prefixConn{buf, c}
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}
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