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net/connstats: invert network logging data flow (#6272)

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Previously, tstun.Wrapper and magicsock.Conn managed their
own statistics data structure and relied on an external call to
Extract to extract (and reset) the statistics.
This makes it difficult to ensure a maximum size on the statistics
as the caller has no introspection into whether the number
of unique connections is getting too large.

Invert the control flow such that a *connstats.Statistics
is registered with tstun.Wrapper and magicsock.Conn.
Methods on non-nil *connstats.Statistics are called for every packet.
This allows the implementation of connstats.Statistics (in the future)
to better control when it needs to flush to ensure
bounds on maximum sizes.

The value registered into tstun.Wrapper and magicsock.Conn could
be an interface, but that has two performance detriments:

1. Method calls on interface values are more expensive since
they must go through a virtual method dispatch.

2. The implementation would need a sync.Mutex to protect the
statistics value instead of using an atomic.Pointer.

Given that methods on constats.Statistics are called for every packet,
we want reduce the CPU cost on this hot path.

Signed-off-by: Joe Tsai <joetsai@digital-static.net>
This commit is contained in:
Joe Tsai
2022-11-28 15:59:33 -08:00
committed by GitHub
parent 35c10373b5
commit 2e5d08ec4f
10 changed files with 172 additions and 252 deletions
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4
cmd/tailscaled/depaware.txt
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@@ -218,6 +218,7 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
tailscale.com/logtail/backoff from tailscale.com/control/controlclient+
tailscale.com/logtail/filch from tailscale.com/logpolicy
tailscale.com/metrics from tailscale.com/derp+
tailscale.com/net/connstats from tailscale.com/net/tstun+
tailscale.com/net/dns from tailscale.com/ipn/ipnlocal+
tailscale.com/net/dns/publicdns from tailscale.com/net/dns/resolver+
tailscale.com/net/dns/resolvconffile from tailscale.com/net/dns+
@@ -245,7 +246,6 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
tailscale.com/net/tsdial from tailscale.com/control/controlclient+
💣 tailscale.com/net/tshttpproxy from tailscale.com/control/controlclient+
tailscale.com/net/tstun from tailscale.com/net/dns+
tailscale.com/net/tunstats from tailscale.com/net/tstun
tailscale.com/net/wsconn from tailscale.com/control/controlhttp+
tailscale.com/paths from tailscale.com/ipn/ipnlocal+
💣 tailscale.com/portlist from tailscale.com/ipn/ipnlocal
@@ -268,7 +268,7 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
tailscale.com/types/key from tailscale.com/control/controlbase+
tailscale.com/types/logger from tailscale.com/control/controlclient+
tailscale.com/types/logid from tailscale.com/logtail+
tailscale.com/types/netlogtype from tailscale.com/net/tstun+
tailscale.com/types/netlogtype from tailscale.com/net/connstats+
tailscale.com/types/netmap from tailscale.com/control/controlclient+
tailscale.com/types/nettype from tailscale.com/wgengine/magicsock+
tailscale.com/types/opt from tailscale.com/control/controlclient+