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logtail, net/portmapper, wgengine/magicsock: use fmt.Appendf

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Fixes #5206

Change-Id: I490bb92e774ce7c044040537e2cd864fcf1dbe5a
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick 2022-08-03 21:29:11 -07:00 committed by Brad Fitzpatrick
parent 4aa88bc2c0
commit 5381437664
4 changed files with 4 additions and 7 deletions
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5
logtail/buffer.go
View File

@ -5,7 +5,6 @@
package logtail
import (
"bytes"
"errors"
"fmt"
"sync"
@ -51,9 +50,7 @@ func (m *memBuffer) TryReadLine() ([]byte, error) {
case ent := <-m.pending:
if ent.dropCount > 0 {
m.next = ent.msg
buf := new(bytes.Buffer)
fmt.Fprintf(buf, "----------- %d logs dropped ----------", ent.dropCount)
return buf.Bytes(), nil
return fmt.Appendf(nil, "----------- %d logs dropped ----------", ent.dropCount), nil
}
return ent.msg, nil
default:

2
logtail/logtail.go
View File

@ -270,7 +270,7 @@ func (l *Logger) drainPending(scratch []byte) (res []byte) {
if err == io.EOF {
break
} else if err != nil {
b = []byte(fmt.Sprintf("reading ringbuffer: %v", err))
b = fmt.Appendf(nil, "reading ringbuffer: %v", err)
batchDone = true
} else if b == nil {
if entries > 0 {

2
net/portmapper/igd_test.go
View File

@ -143,7 +143,7 @@ func (d *TestIGD) serveUPnPDiscovery() {
pkt := buf[:n]
if bytes.Equal(pkt, uPnPPacket) { // a super lazy "parse"
d.inc(&d.counters.numUPnPDiscoRecv)
resPkt := []byte(fmt.Sprintf("HTTP/1.1 200 OK\r\nCACHE-CONTROL: max-age=120\r\nST: urn:schemas-upnp-org:device:InternetGatewayDevice:1\r\nUSN: uuid:bee7052b-49e8-3597-b545-55a1e38ac11::urn:schemas-upnp-org:device:InternetGatewayDevice:1\r\nEXT:\r\nSERVER: Tailscale-Test/1.0 UPnP/1.1 MiniUPnPd/2.2.1\r\nLOCATION: %s\r\nOPT: \"http://schemas.upnp.org/upnp/1/0/\"; ns=01\r\n01-NLS: 1627958564\r\nBOOTID.UPNP.ORG: 1627958564\r\nCONFIGID.UPNP.ORG: 1337\r\n\r\n", d.ts.URL+"/rootDesc.xml"))
resPkt := fmt.Appendf(nil, "HTTP/1.1 200 OK\r\nCACHE-CONTROL: max-age=120\r\nST: urn:schemas-upnp-org:device:InternetGatewayDevice:1\r\nUSN: uuid:bee7052b-49e8-3597-b545-55a1e38ac11::urn:schemas-upnp-org:device:InternetGatewayDevice:1\r\nEXT:\r\nSERVER: Tailscale-Test/1.0 UPnP/1.1 MiniUPnPd/2.2.1\r\nLOCATION: %s\r\nOPT: \"http://schemas.upnp.org/upnp/1/0/\"; ns=01\r\n01-NLS: 1627958564\r\nBOOTID.UPNP.ORG: 1627958564\r\nCONFIGID.UPNP.ORG: 1337\r\n\r\n", d.ts.URL+"/rootDesc.xml")
if d.doUPnP {
_, err = d.upnpConn.WriteTo(resPkt, src)
if err != nil {

2
wgengine/magicsock/magicsock.go
View File

@ -811,7 +811,7 @@ func (c *Conn) pickDERPFallback() int {
}
h := fnv.New64()
h.Write([]byte(fmt.Sprintf("%p/%d", c, processStartUnixNano))) // arbitrary
fmt.Fprintf(h, "%p/%d", c, processStartUnixNano) // arbitrary
return ids[rand.New(rand.NewSource(int64(h.Sum64()))).Intn(len(ids))]
}