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Commit Graph

Author	SHA1	Message	Date
Marius G	6e33dbf96a	p2p: fix flaky test TestServerPortMapping (#30241 ) The test specifies `ListenAddr: ":0"`, which means a random ephemeral port will be chosen for the TCP listener by the OS. Additionally, since no `DiscAddr` was specified, the same port that is chosen automatically by the OS will also be used for the UDP listener in the discovery UDP setup. This sometimes leads to test failures if the TCP listener picks a free TCP port that is already taken for UDP. By specifying `DiscAddr: ":0"`, the UDP port will be chosen independently from the TCP port, fixing the random failure. See issue #29830. Verified using ``` cd p2p go test -c -race stress ./p2p.test -test.run=TestServerPortMapping ... 5m0s: 4556 runs so far, 0 failures ``` The issue described above can technically lead to sporadic failures on systems that specify a listen address via the `--port` flag of 0 while not setting `--discovery.port`. Since the default is using port `30303` and using a random ephemeral port is likely not used much to begin with, not addressing the root cause might be acceptable.	6 months ago
Felix Lange	bc6569462d	p2p: use netip.Addr where possible (#29891 ) enode.Node was recently changed to store a cache of endpoint information. The IP address in the cache is a netip.Addr. I chose that type over net.IP because it is just better. netip.Addr is meant to be used as a value type. Copying it does not allocate, it can be compared with ==, and can be used as a map key. This PR changes most uses of Node.IP() into Node.IPAddr(), which returns the cached value directly without allocating. While there are still some public APIs left where net.IP is used, I have converted all code used internally by p2p/discover to the new types. So this does change some public Go API, but hopefully not APIs any external code actually uses. There weren't supposed to be any semantic differences resulting from this refactoring, however it does introduce one: In package p2p/netutil we treated the 0.0.0.0/8 network (addresses 0.x.y.z) as LAN, but netip.Addr.IsPrivate() doesn't. The treatment of this particular IP address range is controversial, with some software supporting it and others not. IANA lists it as special-purpose and invalid as a destination for a long time, so I don't know why I put it into the LAN list. It has now been marked as special in p2p/netutil as well.	8 months ago
Seungbae Yu	60ecf48dd4	cmd/bootnode, p2p: support for alternate mapped ports (#26359 ) This changes the port mapping procedure such that, when the requested port is unavailable an alternative port suggested by the router is used instead. We now also repeatedly request the external IP from the router in order to catch any IP changes. Co-authored-by: Felix Lange <fjl@twurst.com>	2 years ago

Author

SHA1

Message

Date

Marius G

6e33dbf96a

p2p: fix flaky test TestServerPortMapping (#30241 )

The test specifies `ListenAddr: ":0"`, which means a random ephemeral
port will be chosen for the TCP listener by the OS. Additionally, since
no `DiscAddr` was specified, the same port that is chosen automatically
by the OS will also be used for the UDP listener in the discovery UDP
setup. This sometimes leads to test failures if the TCP listener picks a
free TCP port that is already taken for UDP. By specifying `DiscAddr:
":0"`, the UDP port will be chosen independently from the TCP port,
fixing the random failure.

See issue #29830.

Verified using
```
cd p2p
go test -c -race
stress ./p2p.test -test.run=TestServerPortMapping
...
5m0s: 4556 runs so far, 0 failures
```

The issue described above can technically lead to sporadic failures on
systems that specify a listen address via the `--port` flag of 0 while
not setting `--discovery.port`. Since the default is using port `30303`
and using a random ephemeral port is likely not used much to begin with,
not addressing the root cause might be acceptable.

6 months ago

Felix Lange

bc6569462d

p2p: use netip.Addr where possible (#29891 )

enode.Node was recently changed to store a cache of endpoint information. The IP address in the cache is a netip.Addr. I chose that type over net.IP because it is just better. netip.Addr is meant to be used as a value type. Copying it does not allocate, it can be compared with ==, and can be used as a map key.

This PR changes most uses of Node.IP() into Node.IPAddr(), which returns the cached value directly without allocating.
While there are still some public APIs left where net.IP is used, I have converted all code used internally by p2p/discover to the new types. So this does change some public Go API, but hopefully not APIs any external code actually uses.

There weren't supposed to be any semantic differences resulting from this refactoring, however it does introduce one: In package p2p/netutil we treated the 0.0.0.0/8 network (addresses 0.x.y.z) as LAN, but netip.Addr.IsPrivate() doesn't. The treatment of this particular IP address range is controversial, with some software supporting it and others not. IANA lists it as special-purpose and invalid as a destination for a long time, so I don't know why I put it into the LAN list. It has now been marked as special in p2p/netutil as well.

8 months ago

Seungbae Yu

60ecf48dd4

cmd/bootnode, p2p: support for alternate mapped ports (#26359 )

This changes the port mapping procedure such that, when the requested port is unavailable
an alternative port suggested by the router is used instead.

We now also repeatedly request the external IP from the router in order to catch any IP changes.

Co-authored-by: Felix Lange <fjl@twurst.com>

2 years ago

3 Commits (9848e9b046f67bfef015b4ac7c834c8de9229147)