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MultiAddress.String representation question #230

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0xTylerHolmes opened this issue Jan 23, 2024 · 8 comments
Closed

MultiAddress.String representation question #230

0xTylerHolmes opened this issue Jan 23, 2024 · 8 comments

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@0xTylerHolmes
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I'm trying to understand some of the caveats of the different NewMultiaddr functions. Is the string representation of a multiaddress supposed to be compatible with the string constructor? e.g.

// m is a previously constructed MultiAddr
m2, err := ma.NewMultiaddr(m.String())

Should NewMultiaddr ever fail? My understanding is that m2 should always succeed and that m.Equal(m2) should always be true.
@Jorropo
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Jorropo commented Jan 24, 2024

This is correct.

@Jorropo
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Jorropo commented Jan 24, 2024

I think there are edge cases like base64 where you can add extra padding which is trimmed off if you do the round trip.

@Jorropo
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Jorropo commented Jan 24, 2024 •
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Actually no, I was completely wrong, there are plenty of counter examples where we canonicalize old encodings:

--- FAIL: FuzzNewMultiaddrString (0.01s)
    --- FAIL: FuzzNewMultiaddrString/seed#23 (0.00s)
        multiaddr_test.go:543: before and after don't match "/garlic32/566niximlxdzpanmn4qouucvua3k7neniwss47li5r6ugoertzuqzwassw" "/garlic32/566niximlxdzpanmn4qouucvua3k7neniwss47li5r6ugoertzuqzwassu"
    --- FAIL: FuzzNewMultiaddrString/seed#35 (0.00s)
        multiaddr_test.go:543: before and after don't match "/ipfs/QmcgpsyWgH8Y8ajJz1Cu72KnS5uo2Aa2LpzU7kinSupNKC" "/p2p/QmcgpsyWgH8Y8ajJz1Cu72KnS5uo2Aa2LpzU7kinSupNKC"
    --- FAIL: FuzzNewMultiaddrString/seed#36 (0.00s)
        multiaddr_test.go:543: before and after don't match "/ipfs/k2k4r8oqamigqdo6o7hsbfwd45y70oyynp98usk7zmyfrzpqxh1pohl7" "/p2p/QmcgpsyWgH8Y8ajJz1Cu72KnS5uo2Aa2LpzU7kinSupNKC"
    --- FAIL: FuzzNewMultiaddrString/seed#38 (0.00s)
        multiaddr_test.go:543: before and after don't match "/p2p/k2k4r8oqamigqdo6o7hsbfwd45y70oyynp98usk7zmyfrzpqxh1pohl7" "/p2p/QmcgpsyWgH8Y8ajJz1Cu72KnS5uo2Aa2LpzU7kinSupNKC"
    --- FAIL: FuzzNewMultiaddrString/seed#39 (0.00s)
        multiaddr_test.go:543: before and after don't match "/p2p/bafzbeigvf25ytwc3akrijfecaotc74udrhcxzh2cx3we5qqnw5vgrei4bm" "/p2p/QmcgpsyWgH8Y8ajJz1Cu72KnS5uo2Aa2LpzU7kinSupNKC"
    --- FAIL: FuzzNewMultiaddrString/seed#41 (0.00s)
        multiaddr_test.go:543: before and after don't match "/p2p/k51qzi5uqu5dhb6l8spkdx7yxafegfkee5by8h7lmjh2ehc2sgg34z7c15vzqs" "/p2p/12D3KooWCryG7Mon9orvQxcS1rYZjotPgpwoJNHHKcLLfE4Hf5mV"
    --- FAIL: FuzzNewMultiaddrString/seed#42 (0.00s)
        multiaddr_test.go:543: before and after don't match "/p2p/bafzaajaiaejcalj543iwv2d7pkjt7ykvefrkfu7qjfi6sduakhso4lay6abn2d5u" "/p2p/12D3KooWCryG7Mon9orvQxcS1rYZjotPgpwoJNHHKcLLfE4Hf5mV"
    --- FAIL: FuzzNewMultiaddrString/seed#49 (0.00s)
        multiaddr_test.go:543: before and after don't match "/ipfs/QmcgpsyWgH8Y8ajJz1Cu72KnS5uo2Aa2LpzU7kinSupNKC/tcp/1234" "/p2p/QmcgpsyWgH8Y8ajJz1Cu72KnS5uo2Aa2LpzU7kinSupNKC/tcp/1234"
    --- FAIL: FuzzNewMultiaddrString/seed#50 (0.00s)
        multiaddr_test.go:543: before and after don't match "/ipfs/k2k4r8oqamigqdo6o7hsbfwd45y70oyynp98usk7zmyfrzpqxh1pohl7/tcp/1234" "/p2p/QmcgpsyWgH8Y8ajJz1Cu72KnS5uo2Aa2LpzU7kinSupNKC/tcp/1234"
    --- FAIL: FuzzNewMultiaddrString/seed#52 (0.00s)
        multiaddr_test.go:543: before and after don't match "/p2p/k2k4r8oqamigqdo6o7hsbfwd45y70oyynp98usk7zmyfrzpqxh1pohl7/tcp/1234" "/p2p/QmcgpsyWgH8Y8ajJz1Cu72KnS5uo2Aa2LpzU7kinSupNKC/tcp/1234"
    --- FAIL: FuzzNewMultiaddrString/seed#56 (0.00s)
        multiaddr_test.go:543: before and after don't match "/ip4/127.0.0.1/tcp/1234/" "/ip4/127.0.0.1/tcp/1234"
    --- FAIL: FuzzNewMultiaddrString/seed#60 (0.00s)
        multiaddr_test.go:543: before and after don't match "/ip4/127.0.0.1/udp/1234/quic-v1/webtransport/certhash/b2uaraocy6yrdblb4sfptaddgimjmmpy" "/ip4/127.0.0.1/udp/1234/quic-v1/webtransport/certhash/u1QEQOFj2IjCsPJFfMAxmQxLGPw"
    --- FAIL: FuzzNewMultiaddrString/seed#61 (0.00s)
        multiaddr_test.go:543: before and after don't match "/ip4/127.0.0.1/udp/1234/quic-v1/webtransport/certhash/b2uaraocy6yrdblb4sfptaddgimjmmpy/certhash/zQmbWTwYGcmdyK9CYfNBcfs9nhZs17a6FQ4Y8oea278xx41" "/ip4/127.0.0.1/udp/1234/quic-v1/webtransport/certhash/u1QEQOFj2IjCsPJFfMAxmQxLGPw/certhash/uEiDDq4_xNyDorZBH3TlGazyJdOWSwvo4PUo5YHFMrvDE8g"
    --- FAIL: FuzzNewMultiaddrString/seed#62 (0.00s)
        multiaddr_test.go:543: before and after don't match "/ip4/127.0.0.1/ipfs/QmcgpsyWgH8Y8ajJz1Cu72KnS5uo2Aa2LpzU7kinSupNKC" "/ip4/127.0.0.1/p2p/QmcgpsyWgH8Y8ajJz1Cu72KnS5uo2Aa2LpzU7kinSupNKC"
    --- FAIL: FuzzNewMultiaddrString/seed#63 (0.00s)
        multiaddr_test.go:543: before and after don't match "/ip4/127.0.0.1/ipfs/QmcgpsyWgH8Y8ajJz1Cu72KnS5uo2Aa2LpzU7kinSupNKC/tcp/1234" "/ip4/127.0.0.1/p2p/QmcgpsyWgH8Y8ajJz1Cu72KnS5uo2Aa2LpzU7kinSupNKC/tcp/1234"
    --- FAIL: FuzzNewMultiaddrString/seed#64 (0.00s)
        multiaddr_test.go:543: before and after don't match "/ip4/127.0.0.1/ipfs/k2k4r8oqamigqdo6o7hsbfwd45y70oyynp98usk7zmyfrzpqxh1pohl7" "/ip4/127.0.0.1/p2p/QmcgpsyWgH8Y8ajJz1Cu72KnS5uo2Aa2LpzU7kinSupNKC"
    --- FAIL: FuzzNewMultiaddrString/seed#65 (0.00s)
        multiaddr_test.go:543: before and after don't match "/ip4/127.0.0.1/ipfs/k2k4r8oqamigqdo6o7hsbfwd45y70oyynp98usk7zmyfrzpqxh1pohl7/tcp/1234" "/ip4/127.0.0.1/p2p/QmcgpsyWgH8Y8ajJz1Cu72KnS5uo2Aa2LpzU7kinSupNKC/tcp/1234"
    --- FAIL: FuzzNewMultiaddrString/seed#68 (0.00s)
        multiaddr_test.go:543: before and after don't match "/ip4/127.0.0.1/p2p/k2k4r8oqamigqdo6o7hsbfwd45y70oyynp98usk7zmyfrzpqxh1pohl7" "/ip4/127.0.0.1/p2p/QmcgpsyWgH8Y8ajJz1Cu72KnS5uo2Aa2LpzU7kinSupNKC"
    --- FAIL: FuzzNewMultiaddrString/seed#69 (0.00s)
        multiaddr_test.go:543: before and after don't match "/ip4/127.0.0.1/p2p/k2k4r8oqamigqdo6o7hsbfwd45y70oyynp98usk7zmyfrzpqxh1pohl7/tcp/1234" "/ip4/127.0.0.1/p2p/QmcgpsyWgH8Y8ajJz1Cu72KnS5uo2Aa2LpzU7kinSupNKC/tcp/1234"
    --- FAIL: FuzzNewMultiaddrString/seed#73 (0.00s)
        multiaddr_test.go:543: before and after don't match "/ip4/127.0.0.1/ipfs/QmcgpsyWgH8Y8ajJz1Cu72KnS5uo2Aa2LpzU7kinSupNKC/tcp/1234/unix/stdio" "/ip4/127.0.0.1/p2p/QmcgpsyWgH8Y8ajJz1Cu72KnS5uo2Aa2LpzU7kinSupNKC/tcp/1234/unix/stdio"
    --- FAIL: FuzzNewMultiaddrString/seed#74 (0.00s)
        multiaddr_test.go:543: before and after don't match "/ip4/127.0.0.1/ipfs/k2k4r8oqamigqdo6o7hsbfwd45y70oyynp98usk7zmyfrzpqxh1pohl7/tcp/1234/unix/stdio" "/ip4/127.0.0.1/p2p/QmcgpsyWgH8Y8ajJz1Cu72KnS5uo2Aa2LpzU7kinSupNKC/tcp/1234/unix/stdio"
    --- FAIL: FuzzNewMultiaddrString/seed#76 (0.00s)
        multiaddr_test.go:543: before and after don't match "/ip4/127.0.0.1/p2p/k2k4r8oqamigqdo6o7hsbfwd45y70oyynp98usk7zmyfrzpqxh1pohl7/tcp/1234/unix/stdio" "/ip4/127.0.0.1/p2p/QmcgpsyWgH8Y8ajJz1Cu72KnS5uo2Aa2LpzU7kinSupNKC/tcp/1234/unix/stdio"
    --- FAIL: FuzzNewMultiaddrString/63891c9534054d61 (0.00s)
        multiaddr_test.go:543: before and after don't match "/p2p/BAfZA2jA222222222222222222222222222222222222222222222222222222222" "/p2p/2wkP41SiPzyR6TaGRLzjiywpQVC1HgGK2Ea3tSUeWtobGyZAivsT"
    --- FAIL: FuzzNewMultiaddrString/95a479f85dc92117 (0.00s)
        multiaddr_test.go:543: before and after don't match "/p2p/BAfZBAjA222222222222222222222222222222222222222222222222222222222" "/p2p/3PVGmVXQvTiq21ca5aBR7WEH9nnxnw5VWZSSZoWvzL4j7y9nD8HF"

Generally they have the same semantics, m2.Equal(m) should always be true however.

@0xTylerHolmes
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In general though m2 should always succeed correct?

@Jorropo
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Jorropo commented Jan 24, 2024 •
edited
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should is doing heavy work here.
I doubt this actually happens, a counter example probably exists somewhere.

Some weird edge case invalid thing can slip through the cracks.

@0xTylerHolmes
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0xTylerHolmes commented Jan 24, 2024 •
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Thanks for clarity, there are several edge cases here generally around different encoding types. It does seem a bit troubling that the str representation isn't valid. (e.g. I have several cases where we error on m2 creation or if we do succeed !m.Equal(m2)), but I don't see a valid use case where someone would want to do this in production.

As long as this doesn't sound alarming I'm satisfied with my current understanding and I'll close this issue.

@Jorropo
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Jorropo commented Feb 9, 2024

Hey I improved fuzzing and @sukunrt fixed a bunch of edge cases in 77f3edf.
Could you retry your:

I have several cases where we error on m2 creation or if we do succeed !m.Equal(m2)

cases with v0.12.2 they should be consistent now.

Again I don't think it's critical to have complete consistency but it's still nice.

@sukunrt
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sukunrt commented Mar 4, 2024

Fixed by #232

@sukunrt sukunrt closed this as completed Mar 4, 2024
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@sukunrt @Jorropo @0xTylerHolmes