device: optimize Peer.String
Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
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parent
5846b62283
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25ad08a591
@ -9,7 +9,6 @@ import (
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"container/list"
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"encoding/base64"
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"errors"
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"fmt"
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"sync"
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"sync/atomic"
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"time"
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@ -144,12 +143,26 @@ func (peer *Peer) SendBuffer(buffer []byte) error {
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}
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func (peer *Peer) String() string {
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base64Key := base64.StdEncoding.EncodeToString(peer.handshake.remoteStatic[:])
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abbreviatedKey := "invalid"
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if len(base64Key) == 44 {
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abbreviatedKey = base64Key[0:4] + "…" + base64Key[39:43]
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}
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return fmt.Sprintf("peer(%s)", abbreviatedKey)
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// The awful goo that follows is identical to:
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//
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// base64Key := base64.StdEncoding.EncodeToString(peer.handshake.remoteStatic[:])
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// abbreviatedKey := base64Key[0:4] + "…" + base64Key[39:43]
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// return fmt.Sprintf("peer(%s)", abbreviatedKey)
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//
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// except that it is considerably more efficient.
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const prefix = "peer("
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b := make([]byte, len(prefix)+44)
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copy(b, prefix)
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r := b[len(prefix):]
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base64.StdEncoding.Encode(r, peer.handshake.remoteStatic[:])
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r = r[4:]
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copy(r, "…")
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r = r[len("…"):]
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copy(r, b[len(prefix)+39:len(prefix)+43])
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r = r[4:]
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r[0] = ')'
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r = r[1:]
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return string(b[:len(b)-len(r)])
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}
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func (peer *Peer) Start() {
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