From: Mike Hearn <mike@plan99•net>
To: Turkey Breast <turkeybreast@yahoo•com>
Cc: "bitcoin-development@lists•sourceforge.net"
<bitcoin-development@lists•sourceforge.net>
Subject: Re: [Bitcoin-development] Missing fRelayTxes in version message
Date: Wed, 19 Jun 2013 12:43:29 +0200 [thread overview]
Message-ID: <CANEZrP05z2gs7e=oVZOMpVxUbQRzWF1aBKTc5TLvgWSN+NY-sw@mail.gmail.com> (raw)
In-Reply-To: <1371637993.17115.YahooMailNeo@web162701.mail.bf1.yahoo.com>
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Bitcoin-Qt on master does send it now although it doesn't affect anything,
but as old pre-filtering versions will continue to exist, you'll always
have to be able to deserialize version messages without it.
Bitcoin version messages have always had variable length, look at how the
code is written in main.cpp. If you didn't experience issues until now all
it means is that no sufficiently old nodes were talking to yours.
The standard does not say it should appear. Read it again - BIP 37 says
about the new version message field:
If false then broadcast transactions will not be announced until a
filter{load,add,clear} command is received. *If missing or true*, no change
in protocol behaviour occurs.
On Wed, Jun 19, 2013 at 12:33 PM, Turkey Breast <turkeybreast@yahoo•com>wrote:
> It's a problem if you work with iterators to deserialize the byte stream.
> Even failing that, it's just sloppy programming. What happens in the future
> when new fields are added to the version message? It's not a big deal to
> say that this protocol version has X number of fields, that (higher)
> protocol version message has X + N number of fields. Deterministic number
> of fields per protocol version is sensical and how Bitcoin has been for a
> long time.
>
> And yes, it was a problem for me that caused a lot of confusion why this
> byte didn't exist in many version messages despite the standard saying it
> should and the code in bitcoind indicating it should. Nowhere was this
> written. It doesn't help other implementations to have an unclear behaviour
> that depends on some magic from one implementation.
>
> ------------------------------
> *From:* Mike Hearn <mike@plan99•net>
> *To:* Turkey Breast <turkeybreast@yahoo•com>
> *Cc:* "bitcoin-development@lists•sourceforge.net" <
> bitcoin-development@lists•sourceforge.net>
> *Sent:* Wednesday, June 19, 2013 11:39 AM
>
> *Subject:* Re: [Bitcoin-development] Missing fRelayTxes in version message
>
> It has to be optional because old clients don't send it, obviously.
>
> Why is this even an issue? There's no problem with variable length
> messages in any codebase that I'm aware of. Is this solving some actual
> problem?
>
>
> On Wed, Jun 19, 2013 at 12:30 AM, Turkey Breast <turkeybreast@yahoo•com>wrote:
>
> That's me. I never said to make all messages fixed length. I said to make
> a fixed number of fields per protocol. So given a protocol version number,
> you know the number of fields in a message. This is not only easier for
> parsing messages, but just good practice. I don't see why a 1 byte flag
> needs to be optional anyway.
>
> ------------------------------
> *From:* Mike Hearn <mike@plan99•net>
> *To:* Turkey Breast <turkeybreast@yahoo•com>
> *Cc:* Bitcoin Dev <bitcoin-development@lists•sourceforge.net>
> *Sent:* Tuesday, June 18, 2013 9:48 PM
> *Subject:* Re: [Bitcoin-development] Missing fRelayTxes in version message
>
> It's not a bug (although there was recently a change to make bitcoind/qt
> always send this field anyway).
>
> I don't know where Amir is going with BIP 60. Version messages have always
> been variable length. There's nothing inherent in the Bitcoin protocol that
> says all messages are fixed length, indeed, tx messages are allowed to have
> arbitrary data appended after them that gets relayed.
>
>
> On Tue, Jun 18, 2013 at 7:45 PM, Turkey Breast <turkeybreast@yahoo•com>wrote:
>
> See this BIP. I'm not sure if this is a bug or what, but it would be good
> if messages always had a fixed number of fields per protocol version.
>
> https://en.bitcoin.it/wiki/BIP_0060#Code_Updates
>
> This BIP details everything that needs to be done and proposes a protocol
> upgrade.
>
>
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next prev parent reply other threads:[~2013-06-19 10:43 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-18 17:45 Turkey Breast
2013-06-18 19:48 ` Mike Hearn
2013-06-18 22:30 ` Turkey Breast
2013-06-19 9:39 ` Mike Hearn
2013-06-19 10:33 ` Turkey Breast
2013-06-19 10:43 ` Mike Hearn [this message]
2013-06-19 13:03 Paul Lyon
2013-06-19 13:20 ` Mike Hearn
2013-06-20 6:20 ` Turkey Breast
2013-06-20 7:10 ` Mike Hearn
2013-06-20 7:13 ` Addy Yeow
2013-06-20 13:35 ` Jeff Garzik
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