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all: use syncs.AtomicValue

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Signed-off-by: Maisem Ali <maisem@tailscale.com>
This commit is contained in:
Maisem Ali
2022-08-04 10:43:49 -07:00
committed by Maisem Ali
parent b75f81ec00
commit a9f6cd41fd
23 changed files with 97 additions and 101 deletions
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7
cmd/derper/bootstrap_dns.go
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@@ -12,11 +12,12 @@ import (
"net"
"net/http"
"strings"
"sync/atomic"
"time"
"tailscale.com/syncs"
)
var dnsCache atomic.Value // of []byte
var dnsCache syncs.AtomicValue[[]byte]
var bootstrapDNSRequests = expvar.NewInt("counter_bootstrap_dns_requests")
@@ -58,7 +59,7 @@ func refreshBootstrapDNS() {
func handleBootstrapDNS(w http.ResponseWriter, r *http.Request) {
bootstrapDNSRequests.Add(1)
w.Header().Set("Content-Type", "application/json")
j, _ := dnsCache.Load().([]byte)
j := dnsCache.Load()
// Bootstrap DNS requests occur cross-regions,
// and are randomized per request,
// so keeping a connection open is pointlessly expensive.

2
cmd/tailscale/depaware.txt
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@@ -71,7 +71,7 @@ tailscale.com/cmd/tailscale dependencies: (generated by github.com/tailscale/dep
💣 tailscale.com/net/tshttpproxy from tailscale.com/derp/derphttp+
tailscale.com/paths from tailscale.com/cmd/tailscale/cli+
tailscale.com/safesocket from tailscale.com/cmd/tailscale/cli+
tailscale.com/syncs from tailscale.com/net/netcheck
tailscale.com/syncs from tailscale.com/net/netcheck+
tailscale.com/tailcfg from tailscale.com/cmd/tailscale/cli+
tailscale.com/tka from tailscale.com/types/key
W tailscale.com/tsconst from tailscale.com/net/interfaces