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cmd/derpprobe: bound node pair probe duration

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Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick 2021-07-14 12:05:39 -07:00
parent e28bc49e5f
commit ee71c966fd
1 changed files with 10 additions and 0 deletions
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10
cmd/derpprobe/derpprobe.go
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@ -190,6 +190,16 @@ func probe() error {
}
func probeNodePair(ctx context.Context, dm *tailcfg.DERPMap, from, to *tailcfg.DERPNode) (latency time.Duration, err error) {
// The passed in context is a minute for the whole region. The
// idea is that each node pair in the region will be done
// serially and regularly in the future, reusing connections
// (at least in the happy path). For now they don't reuse
// connections and probe at most once every 15 seconds. We
// bound the duration of a single node pair within a region
// so one bad one can't starve others.
ctx, cancel := context.WithTimeout(ctx, 10*time.Second)
defer cancel()
fromc, err := newConn(ctx, dm, from)
if err != nil {
return 0, err