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* [Bitcoin-development] BIP70/71 issue, RFD
@ 2014-01-26 21:11 Andreas Schildbach
  2014-01-26 21:24 ` Mike Hearn
  0 siblings, 1 reply; 7+ messages in thread
From: Andreas Schildbach @ 2014-01-26 21:11 UTC (permalink / raw)
  To: bitcoin-development

I'm experimenting with BIP70/71 (payment protocol) usage in face to face
payments (more on that soon).

I've excountered an issue with the protobuf format. Protobufs are not
self-delimiting. That means if you're reading from an undelimited
stream, you will read endlessly because you don't know how much to read.

The current BIP70 implementations probably work because they're reading
either from a file or from an HTTP resource which sets the
Content-Length header. Trouble is the Content-Length header is optional,
and also there are many kinds of streams that don't have this built-in
delimiting mechanism.

The Java protobuf API solves this by offering delimited I/O, like

payment.writeDelimitedTo(os);

This writes the size of the message as a varint before writing the data.
I don't know about protobuf implementations for other languages but I'd
expect them to offer something compatible.

However, this leading varint is an incompatible change and would need to
be added to the spec.

I specifically encountered this with PaymentMessage and PaymentACK, but
it might be a good idea to apply this to all messages if any. Open for
discussion.




^ permalink raw reply	[flat|nested] 7+ messages in thread

• * Re: [Bitcoin-development] BIP70/71 issue, RFD
    2014-01-26 21:11 [Bitcoin-development] BIP70/71 issue, RFD Andreas Schildbach
  @ 2014-01-26 21:24 ` Mike Hearn
    2014-01-26 21:32   ` Andreas Schildbach
    0 siblings, 1 reply; 7+ messages in thread
  From: Mike Hearn @ 2014-01-26 21:24 UTC (permalink / raw)
    To: Andreas Schildbach; +Cc: Bitcoin Dev
  
  [-- Attachment #1: Type: text/plain, Size: 2039 bytes --]
  
  Which medium is this an issue for? As you note, for files and HTTP
  responses it's not a problem in practice. i'd guess nor for NFC tags nor QR
  codes.
  
  
  On Sun, Jan 26, 2014 at 10:11 PM, Andreas Schildbach
  <andreas@schildbach•de>wrote:
  
  > I'm experimenting with BIP70/71 (payment protocol) usage in face to face
  > payments (more on that soon).
  >
  > I've excountered an issue with the protobuf format. Protobufs are not
  > self-delimiting. That means if you're reading from an undelimited
  > stream, you will read endlessly because you don't know how much to read.
  >
  > The current BIP70 implementations probably work because they're reading
  > either from a file or from an HTTP resource which sets the
  > Content-Length header. Trouble is the Content-Length header is optional,
  > and also there are many kinds of streams that don't have this built-in
  > delimiting mechanism.
  >
  > The Java protobuf API solves this by offering delimited I/O, like
  >
  > payment.writeDelimitedTo(os);
  >
  > This writes the size of the message as a varint before writing the data.
  > I don't know about protobuf implementations for other languages but I'd
  > expect them to offer something compatible.
  >
  > However, this leading varint is an incompatible change and would need to
  > be added to the spec.
  >
  > I specifically encountered this with PaymentMessage and PaymentACK, but
  > it might be a good idea to apply this to all messages if any. Open for
  > discussion.
  >
  >
  >
  > ------------------------------------------------------------------------------
  > CenturyLink Cloud: The Leader in Enterprise Cloud Services.
  > Learn Why More Businesses Are Choosing CenturyLink Cloud For
  > Critical Workloads, Development Environments & Everything In Between.
  > Get a Quote or Start a Free Trial Today.
  >
  > http://pubads.g.doubleclick.net/gampad/clk?id=119420431&iu=/4140/ostg.clktrk
  > _______________________________________________
  > Bitcoin-development mailing list
  > Bitcoin-development@lists•sourceforge.net
  > https://lists.sourceforge.net/lists/listinfo/bitcoin-development
  >
  
  [-- Attachment #2: Type: text/html, Size: 2780 bytes --]
  
  ^ permalink raw reply	[flat|nested] 7+ messages in thread

• • * Re: [Bitcoin-development] BIP70/71 issue, RFD
      2014-01-26 21:24 ` Mike Hearn
    @ 2014-01-26 21:32   ` Andreas Schildbach
      2014-01-26 22:00     ` Mike Hearn
      0 siblings, 1 reply; 7+ messages in thread
    From: Andreas Schildbach @ 2014-01-26 21:32 UTC (permalink / raw)
      To: bitcoin-development
    
    Bluetooth, Wifi Direct, HTTP request/responses via broken proxies, smoke
    signals... basically anything that is a stream rather than a file.
    
    Right, NFC NDEF and QR codes are not affected, so we can skip the
    delimiter for these mediums.
    
    
    On 01/26/2014 10:24 PM, Mike Hearn wrote:
    > Which medium is this an issue for? As you note, for files and HTTP
    > responses it's not a problem in practice. i'd guess nor for NFC tags nor
    > QR codes.
    > 
    > 
    > On Sun, Jan 26, 2014 at 10:11 PM, Andreas Schildbach
    > <andreas@schildbach•de <mailto:andreas@schildbach•de>> wrote:
    > 
    >     I'm experimenting with BIP70/71 (payment protocol) usage in face to face
    >     payments (more on that soon).
    > 
    >     I've excountered an issue with the protobuf format. Protobufs are not
    >     self-delimiting. That means if you're reading from an undelimited
    >     stream, you will read endlessly because you don't know how much to read.
    > 
    >     The current BIP70 implementations probably work because they're reading
    >     either from a file or from an HTTP resource which sets the
    >     Content-Length header. Trouble is the Content-Length header is optional,
    >     and also there are many kinds of streams that don't have this built-in
    >     delimiting mechanism.
    > 
    >     The Java protobuf API solves this by offering delimited I/O, like
    > 
    >     payment.writeDelimitedTo(os);
    > 
    >     This writes the size of the message as a varint before writing the data.
    >     I don't know about protobuf implementations for other languages but I'd
    >     expect them to offer something compatible.
    > 
    >     However, this leading varint is an incompatible change and would need to
    >     be added to the spec.
    > 
    >     I specifically encountered this with PaymentMessage and PaymentACK, but
    >     it might be a good idea to apply this to all messages if any. Open for
    >     discussion.
    > 
    > 
    >     ------------------------------------------------------------------------------
    >     CenturyLink Cloud: The Leader in Enterprise Cloud Services.
    >     Learn Why More Businesses Are Choosing CenturyLink Cloud For
    >     Critical Workloads, Development Environments & Everything In Between.
    >     Get a Quote or Start a Free Trial Today.
    >     http://pubads.g.doubleclick.net/gampad/clk?id=119420431&iu=/4140/ostg.clktrk
    >     _______________________________________________
    >     Bitcoin-development mailing list
    >     Bitcoin-development@lists•sourceforge.net
    >     <mailto:Bitcoin-development@lists•sourceforge.net>
    >     https://lists.sourceforge.net/lists/listinfo/bitcoin-development
    > 
    > 
    > 
    > 
    > ------------------------------------------------------------------------------
    > CenturyLink Cloud: The Leader in Enterprise Cloud Services.
    > Learn Why More Businesses Are Choosing CenturyLink Cloud For
    > Critical Workloads, Development Environments & Everything In Between.
    > Get a Quote or Start a Free Trial Today.
    > http://pubads.g.doubleclick.net/gampad/clk?id=119420431&iu=/4140/ostg.clktrk
    > 
    > 
    > 
    > _______________________________________________
    > Bitcoin-development mailing list
    > Bitcoin-development@lists•sourceforge.net
    > https://lists.sourceforge.net/lists/listinfo/bitcoin-development
    > 
    
    
    
    
    
    ^ permalink raw reply	[flat|nested] 7+ messages in thread

  • • * Re: [Bitcoin-development] BIP70/71 issue, RFD
        2014-01-26 21:32   ` Andreas Schildbach
      @ 2014-01-26 22:00     ` Mike Hearn
        2014-01-26 22:14       ` Andreas Schildbach
        0 siblings, 1 reply; 7+ messages in thread
      From: Mike Hearn @ 2014-01-26 22:00 UTC (permalink / raw)
        To: Andreas Schildbach; +Cc: Bitcoin Dev
      
      [-- Attachment #1: Type: text/plain, Size: 4332 bytes --]
      
      I think for "binding" the payment protocol to those transports we should
      indeed use protobuf varint length prefixes. But it's unnecessary for all
      cases. Unless Gavin feels it'd be better to be consistent everywhere and is
      willing to change the spec and code - as far as I know though we're trying
      to ship 0.9rc1 soonish .....
      
      
      On Sun, Jan 26, 2014 at 10:32 PM, Andreas Schildbach
      <andreas@schildbach•de>wrote:
      
      > Bluetooth, Wifi Direct, HTTP request/responses via broken proxies, smoke
      > signals... basically anything that is a stream rather than a file.
      >
      > Right, NFC NDEF and QR codes are not affected, so we can skip the
      > delimiter for these mediums.
      >
      >
      > On 01/26/2014 10:24 PM, Mike Hearn wrote:
      > > Which medium is this an issue for? As you note, for files and HTTP
      > > responses it's not a problem in practice. i'd guess nor for NFC tags nor
      > > QR codes.
      > >
      > >
      > > On Sun, Jan 26, 2014 at 10:11 PM, Andreas Schildbach
      > > <andreas@schildbach•de <mailto:andreas@schildbach•de>> wrote:
      > >
      > >     I'm experimenting with BIP70/71 (payment protocol) usage in face to
      > face
      > >     payments (more on that soon).
      > >
      > >     I've excountered an issue with the protobuf format. Protobufs are not
      > >     self-delimiting. That means if you're reading from an undelimited
      > >     stream, you will read endlessly because you don't know how much to
      > read.
      > >
      > >     The current BIP70 implementations probably work because they're
      > reading
      > >     either from a file or from an HTTP resource which sets the
      > >     Content-Length header. Trouble is the Content-Length header is
      > optional,
      > >     and also there are many kinds of streams that don't have this
      > built-in
      > >     delimiting mechanism.
      > >
      > >     The Java protobuf API solves this by offering delimited I/O, like
      > >
      > >     payment.writeDelimitedTo(os);
      > >
      > >     This writes the size of the message as a varint before writing the
      > data.
      > >     I don't know about protobuf implementations for other languages but
      > I'd
      > >     expect them to offer something compatible.
      > >
      > >     However, this leading varint is an incompatible change and would
      > need to
      > >     be added to the spec.
      > >
      > >     I specifically encountered this with PaymentMessage and PaymentACK,
      > but
      > >     it might be a good idea to apply this to all messages if any. Open
      > for
      > >     discussion.
      > >
      > >
      > >
      > ------------------------------------------------------------------------------
      > >     CenturyLink Cloud: The Leader in Enterprise Cloud Services.
      > >     Learn Why More Businesses Are Choosing CenturyLink Cloud For
      > >     Critical Workloads, Development Environments & Everything In Between.
      > >     Get a Quote or Start a Free Trial Today.
      > >
      > http://pubads.g.doubleclick.net/gampad/clk?id=119420431&iu=/4140/ostg.clktrk
      > >     _______________________________________________
      > >     Bitcoin-development mailing list
      > >     Bitcoin-development@lists•sourceforge.net
      > >     <mailto:Bitcoin-development@lists•sourceforge.net>
      > >     https://lists.sourceforge.net/lists/listinfo/bitcoin-development
      > >
      > >
      > >
      > >
      > >
      > ------------------------------------------------------------------------------
      > > CenturyLink Cloud: The Leader in Enterprise Cloud Services.
      > > Learn Why More Businesses Are Choosing CenturyLink Cloud For
      > > Critical Workloads, Development Environments & Everything In Between.
      > > Get a Quote or Start a Free Trial Today.
      > >
      > http://pubads.g.doubleclick.net/gampad/clk?id=119420431&iu=/4140/ostg.clktrk
      > >
      > >
      > >
      > > _______________________________________________
      > > Bitcoin-development mailing list
      > > Bitcoin-development@lists•sourceforge.net
      > > https://lists.sourceforge.net/lists/listinfo/bitcoin-development
      > >
      >
      >
      >
      >
      > ------------------------------------------------------------------------------
      > CenturyLink Cloud: The Leader in Enterprise Cloud Services.
      > Learn Why More Businesses Are Choosing CenturyLink Cloud For
      > Critical Workloads, Development Environments & Everything In Between.
      > Get a Quote or Start a Free Trial Today.
      >
      > http://pubads.g.doubleclick.net/gampad/clk?id=119420431&iu=/4140/ostg.clktrk
      > _______________________________________________
      > Bitcoin-development mailing list
      > Bitcoin-development@lists•sourceforge.net
      > https://lists.sourceforge.net/lists/listinfo/bitcoin-development
      >
      
      [-- Attachment #2: Type: text/html, Size: 6300 bytes --]
      
      ^ permalink raw reply	[flat|nested] 7+ messages in thread

    • • * Re: [Bitcoin-development] BIP70/71 issue, RFD
          2014-01-26 22:00     ` Mike Hearn
        @ 2014-01-26 22:14       ` Andreas Schildbach
          2014-01-26 23:01         ` Mike Hearn
          0 siblings, 1 reply; 7+ messages in thread
        From: Andreas Schildbach @ 2014-01-26 22:14 UTC (permalink / raw)
          To: bitcoin-development
        
        Just keep in mind that if it turns out we need to retrofit messages with
        length prefixes I fear we will have to restart with new mime-types. The
        nature of prefixes being always at the start means this rules out simply
        incrementing a protocol version number.
        
        Correcting myself:
        
        > it might be a good idea to apply this to all messages if any.
        
        Of course I only mean the "root" messages, namely PaymentRequest,
        Payment, and PaymentACK. The embedded messages don't need length prefixes.
        
        
        On 01/26/2014 11:00 PM, Mike Hearn wrote:
        > I think for "binding" the payment protocol to those transports we should
        > indeed use protobuf varint length prefixes. But it's unnecessary for all
        > cases. Unless Gavin feels it'd be better to be consistent everywhere and
        > is willing to change the spec and code - as far as I know though we're
        > trying to ship 0.9rc1 soonish .....
        > 
        > 
        > On Sun, Jan 26, 2014 at 10:32 PM, Andreas Schildbach
        > <andreas@schildbach•de <mailto:andreas@schildbach•de>> wrote:
        > 
        >     Bluetooth, Wifi Direct, HTTP request/responses via broken proxies, smoke
        >     signals... basically anything that is a stream rather than a file.
        > 
        >     Right, NFC NDEF and QR codes are not affected, so we can skip the
        >     delimiter for these mediums.
        > 
        > 
        >     On 01/26/2014 10:24 PM, Mike Hearn wrote:
        >     > Which medium is this an issue for? As you note, for files and HTTP
        >     > responses it's not a problem in practice. i'd guess nor for NFC
        >     tags nor
        >     > QR codes.
        >     >
        >     >
        >     > On Sun, Jan 26, 2014 at 10:11 PM, Andreas Schildbach
        >     > <andreas@schildbach•de <mailto:andreas@schildbach•de>
        >     <mailto:andreas@schildbach•de <mailto:andreas@schildbach•de>>> wrote:
        >     >
        >     >     I'm experimenting with BIP70/71 (payment protocol) usage in
        >     face to face
        >     >     payments (more on that soon).
        >     >
        >     >     I've excountered an issue with the protobuf format. Protobufs
        >     are not
        >     >     self-delimiting. That means if you're reading from an undelimited
        >     >     stream, you will read endlessly because you don't know how
        >     much to read.
        >     >
        >     >     The current BIP70 implementations probably work because
        >     they're reading
        >     >     either from a file or from an HTTP resource which sets the
        >     >     Content-Length header. Trouble is the Content-Length header is
        >     optional,
        >     >     and also there are many kinds of streams that don't have this
        >     built-in
        >     >     delimiting mechanism.
        >     >
        >     >     The Java protobuf API solves this by offering delimited I/O, like
        >     >
        >     >     payment.writeDelimitedTo(os);
        >     >
        >     >     This writes the size of the message as a varint before writing
        >     the data.
        >     >     I don't know about protobuf implementations for other
        >     languages but I'd
        >     >     expect them to offer something compatible.
        >     >
        >     >     However, this leading varint is an incompatible change and
        >     would need to
        >     >     be added to the spec.
        >     >
        >     >     I specifically encountered this with PaymentMessage and
        >     PaymentACK, but
        >     >     it might be a good idea to apply this to all messages if any.
        >     Open for
        >     >     discussion.
        >     >
        >     >
        >     >    
        >     ------------------------------------------------------------------------------
        >     >     CenturyLink Cloud: The Leader in Enterprise Cloud Services.
        >     >     Learn Why More Businesses Are Choosing CenturyLink Cloud For
        >     >     Critical Workloads, Development Environments & Everything In
        >     Between.
        >     >     Get a Quote or Start a Free Trial Today.
        >     >    
        >     http://pubads.g.doubleclick.net/gampad/clk?id=119420431&iu=/4140/ostg.clktrk
        >     >     _______________________________________________
        >     >     Bitcoin-development mailing list
        >     >     Bitcoin-development@lists•sourceforge.net
        >     <mailto:Bitcoin-development@lists•sourceforge.net>
        >     >     <mailto:Bitcoin-development@lists•sourceforge.net
        >     <mailto:Bitcoin-development@lists•sourceforge.net>>
        >     >     https://lists.sourceforge.net/lists/listinfo/bitcoin-development
        >     >
        >     >
        >     >
        >     >
        >     >
        >     ------------------------------------------------------------------------------
        >     > CenturyLink Cloud: The Leader in Enterprise Cloud Services.
        >     > Learn Why More Businesses Are Choosing CenturyLink Cloud For
        >     > Critical Workloads, Development Environments & Everything In Between.
        >     > Get a Quote or Start a Free Trial Today.
        >     >
        >     http://pubads.g.doubleclick.net/gampad/clk?id=119420431&iu=/4140/ostg.clktrk
        >     >
        >     >
        >     >
        >     > _______________________________________________
        >     > Bitcoin-development mailing list
        >     > Bitcoin-development@lists•sourceforge.net
        >     <mailto:Bitcoin-development@lists•sourceforge.net>
        >     > https://lists.sourceforge.net/lists/listinfo/bitcoin-development
        >     >
        > 
        > 
        > 
        >     ------------------------------------------------------------------------------
        >     CenturyLink Cloud: The Leader in Enterprise Cloud Services.
        >     Learn Why More Businesses Are Choosing CenturyLink Cloud For
        >     Critical Workloads, Development Environments & Everything In Between.
        >     Get a Quote or Start a Free Trial Today.
        >     http://pubads.g.doubleclick.net/gampad/clk?id=119420431&iu=/4140/ostg.clktrk
        >     _______________________________________________
        >     Bitcoin-development mailing list
        >     Bitcoin-development@lists•sourceforge.net
        >     <mailto:Bitcoin-development@lists•sourceforge.net>
        >     https://lists.sourceforge.net/lists/listinfo/bitcoin-development
        > 
        > 
        > 
        > 
        > ------------------------------------------------------------------------------
        > CenturyLink Cloud: The Leader in Enterprise Cloud Services.
        > Learn Why More Businesses Are Choosing CenturyLink Cloud For
        > Critical Workloads, Development Environments & Everything In Between.
        > Get a Quote or Start a Free Trial Today.
        > http://pubads.g.doubleclick.net/gampad/clk?id=119420431&iu=/4140/ostg.clktrk
        > 
        > 
        > 
        > _______________________________________________
        > Bitcoin-development mailing list
        > Bitcoin-development@lists•sourceforge.net
        > https://lists.sourceforge.net/lists/listinfo/bitcoin-development
        > 
        
        
        
        
        
        ^ permalink raw reply	[flat|nested] 7+ messages in thread

      • • * Re: [Bitcoin-development] BIP70/71 issue, RFD
            2014-01-26 22:14       ` Andreas Schildbach
          @ 2014-01-26 23:01         ` Mike Hearn
            2014-01-27  2:05           ` Gavin
            0 siblings, 1 reply; 7+ messages in thread
          From: Mike Hearn @ 2014-01-26 23:01 UTC (permalink / raw)
            To: Andreas Schildbach; +Cc: Bitcoin Dev
          
          [-- Attachment #1: Type: text/plain, Size: 7277 bytes --]
          
          To be more accurate, the embedded messages already have length prefixes :-)
          
          
          On Sun, Jan 26, 2014 at 11:14 PM, Andreas Schildbach
          <andreas@schildbach•de>wrote:
          
          > Just keep in mind that if it turns out we need to retrofit messages with
          > length prefixes I fear we will have to restart with new mime-types. The
          > nature of prefixes being always at the start means this rules out simply
          > incrementing a protocol version number.
          >
          > Correcting myself:
          >
          > > it might be a good idea to apply this to all messages if any.
          >
          > Of course I only mean the "root" messages, namely PaymentRequest,
          > Payment, and PaymentACK. The embedded messages don't need length prefixes.
          >
          >
          > On 01/26/2014 11:00 PM, Mike Hearn wrote:
          > > I think for "binding" the payment protocol to those transports we should
          > > indeed use protobuf varint length prefixes. But it's unnecessary for all
          > > cases. Unless Gavin feels it'd be better to be consistent everywhere and
          > > is willing to change the spec and code - as far as I know though we're
          > > trying to ship 0.9rc1 soonish .....
          > >
          > >
          > > On Sun, Jan 26, 2014 at 10:32 PM, Andreas Schildbach
          > > <andreas@schildbach•de <mailto:andreas@schildbach•de>> wrote:
          > >
          > >     Bluetooth, Wifi Direct, HTTP request/responses via broken proxies,
          > smoke
          > >     signals... basically anything that is a stream rather than a file.
          > >
          > >     Right, NFC NDEF and QR codes are not affected, so we can skip the
          > >     delimiter for these mediums.
          > >
          > >
          > >     On 01/26/2014 10:24 PM, Mike Hearn wrote:
          > >     > Which medium is this an issue for? As you note, for files and HTTP
          > >     > responses it's not a problem in practice. i'd guess nor for NFC
          > >     tags nor
          > >     > QR codes.
          > >     >
          > >     >
          > >     > On Sun, Jan 26, 2014 at 10:11 PM, Andreas Schildbach
          > >     > <andreas@schildbach•de <mailto:andreas@schildbach•de>
          > >     <mailto:andreas@schildbach•de <mailto:andreas@schildbach•de>>>
          > wrote:
          > >     >
          > >     >     I'm experimenting with BIP70/71 (payment protocol) usage in
          > >     face to face
          > >     >     payments (more on that soon).
          > >     >
          > >     >     I've excountered an issue with the protobuf format. Protobufs
          > >     are not
          > >     >     self-delimiting. That means if you're reading from an
          > undelimited
          > >     >     stream, you will read endlessly because you don't know how
          > >     much to read.
          > >     >
          > >     >     The current BIP70 implementations probably work because
          > >     they're reading
          > >     >     either from a file or from an HTTP resource which sets the
          > >     >     Content-Length header. Trouble is the Content-Length header is
          > >     optional,
          > >     >     and also there are many kinds of streams that don't have this
          > >     built-in
          > >     >     delimiting mechanism.
          > >     >
          > >     >     The Java protobuf API solves this by offering delimited I/O,
          > like
          > >     >
          > >     >     payment.writeDelimitedTo(os);
          > >     >
          > >     >     This writes the size of the message as a varint before writing
          > >     the data.
          > >     >     I don't know about protobuf implementations for other
          > >     languages but I'd
          > >     >     expect them to offer something compatible.
          > >     >
          > >     >     However, this leading varint is an incompatible change and
          > >     would need to
          > >     >     be added to the spec.
          > >     >
          > >     >     I specifically encountered this with PaymentMessage and
          > >     PaymentACK, but
          > >     >     it might be a good idea to apply this to all messages if any.
          > >     Open for
          > >     >     discussion.
          > >     >
          > >     >
          > >     >
          > >
          > ------------------------------------------------------------------------------
          > >     >     CenturyLink Cloud: The Leader in Enterprise Cloud Services.
          > >     >     Learn Why More Businesses Are Choosing CenturyLink Cloud For
          > >     >     Critical Workloads, Development Environments & Everything In
          > >     Between.
          > >     >     Get a Quote or Start a Free Trial Today.
          > >     >
          > >
          > http://pubads.g.doubleclick.net/gampad/clk?id=119420431&iu=/4140/ostg.clktrk
          > >     >     _______________________________________________
          > >     >     Bitcoin-development mailing list
          > >     >     Bitcoin-development@lists•sourceforge.net
          > >     <mailto:Bitcoin-development@lists•sourceforge.net>
          > >     >     <mailto:Bitcoin-development@lists•sourceforge.net
          > >     <mailto:Bitcoin-development@lists•sourceforge.net>>
          > >     >
          > https://lists.sourceforge.net/lists/listinfo/bitcoin-development
          > >     >
          > >     >
          > >     >
          > >     >
          > >     >
          > >
          > ------------------------------------------------------------------------------
          > >     > CenturyLink Cloud: The Leader in Enterprise Cloud Services.
          > >     > Learn Why More Businesses Are Choosing CenturyLink Cloud For
          > >     > Critical Workloads, Development Environments & Everything In
          > Between.
          > >     > Get a Quote or Start a Free Trial Today.
          > >     >
          > >
          > http://pubads.g.doubleclick.net/gampad/clk?id=119420431&iu=/4140/ostg.clktrk
          > >     >
          > >     >
          > >     >
          > >     > _______________________________________________
          > >     > Bitcoin-development mailing list
          > >     > Bitcoin-development@lists•sourceforge.net
          > >     <mailto:Bitcoin-development@lists•sourceforge.net>
          > >     > https://lists.sourceforge.net/lists/listinfo/bitcoin-development
          > >     >
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          ^ permalink raw reply	[flat|nested] 7+ messages in thread

        • • * Re: [Bitcoin-development] BIP70/71 issue, RFD
              2014-01-26 23:01         ` Mike Hearn
            @ 2014-01-27  2:05           ` Gavin
              0 siblings, 0 replies; 7+ messages in thread
            From: Gavin @ 2014-01-27  2:05 UTC (permalink / raw)
              To: Mike Hearn; +Cc: Bitcoin Dev, Andreas Schildbach
            
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            Message encoding and length (or terminator or checksum or error correction or...) should be part of the transport protocol, in my humble opinion.
            
            --
            Gavin Andresen
            
            
            > On Jan 26, 2014, at 6:01 PM, Mike Hearn <mike@plan99•net> wrote:
            > 
            > To be more accurate, the embedded messages already have length prefixes :-)
            > 
            > 
            >> On Sun, Jan 26, 2014 at 11:14 PM, Andreas Schildbach <andreas@schildbach•de> wrote:
            >> Just keep in mind that if it turns out we need to retrofit messages with
            >> length prefixes I fear we will have to restart with new mime-types. The
            >> nature of prefixes being always at the start means this rules out simply
            >> incrementing a protocol version number.
            >> 
            >> Correcting myself:
            >> 
            >> > it might be a good idea to apply this to all messages if any.
            >> 
            >> Of course I only mean the "root" messages, namely PaymentRequest,
            >> Payment, and PaymentACK. The embedded messages don't need length prefixes.
            >> 
            >> 
            >> On 01/26/2014 11:00 PM, Mike Hearn wrote:
            >> > I think for "binding" the payment protocol to those transports we should
            >> > indeed use protobuf varint length prefixes. But it's unnecessary for all
            >> > cases. Unless Gavin feels it'd be better to be consistent everywhere and
            >> > is willing to change the spec and code - as far as I know though we're
            >> > trying to ship 0.9rc1 soonish .....
            >> >
            >> >
            >> > On Sun, Jan 26, 2014 at 10:32 PM, Andreas Schildbach
            >> > <andreas@schildbach•de <mailto:andreas@schildbach•de>> wrote:
            >> >
            >> >     Bluetooth, Wifi Direct, HTTP request/responses via broken proxies, smoke
            >> >     signals... basically anything that is a stream rather than a file.
            >> >
            >> >     Right, NFC NDEF and QR codes are not affected, so we can skip the
            >> >     delimiter for these mediums.
            >> >
            >> >
            >> >     On 01/26/2014 10:24 PM, Mike Hearn wrote:
            >> >     > Which medium is this an issue for? As you note, for files and HTTP
            >> >     > responses it's not a problem in practice. i'd guess nor for NFC
            >> >     tags nor
            >> >     > QR codes.
            >> >     >
            >> >     >
            >> >     > On Sun, Jan 26, 2014 at 10:11 PM, Andreas Schildbach
            >> >     > <andreas@schildbach•de <mailto:andreas@schildbach•de>
            >> >     <mailto:andreas@schildbach•de <mailto:andreas@schildbach•de>>> wrote:
            >> >     >
            >> >     >     I'm experimenting with BIP70/71 (payment protocol) usage in
            >> >     face to face
            >> >     >     payments (more on that soon).
            >> >     >
            >> >     >     I've excountered an issue with the protobuf format. Protobufs
            >> >     are not
            >> >     >     self-delimiting. That means if you're reading from an undelimited
            >> >     >     stream, you will read endlessly because you don't know how
            >> >     much to read.
            >> >     >
            >> >     >     The current BIP70 implementations probably work because
            >> >     they're reading
            >> >     >     either from a file or from an HTTP resource which sets the
            >> >     >     Content-Length header. Trouble is the Content-Length header is
            >> >     optional,
            >> >     >     and also there are many kinds of streams that don't have this
            >> >     built-in
            >> >     >     delimiting mechanism.
            >> >     >
            >> >     >     The Java protobuf API solves this by offering delimited I/O, like
            >> >     >
            >> >     >     payment.writeDelimitedTo(os);
            >> >     >
            >> >     >     This writes the size of the message as a varint before writing
            >> >     the data.
            >> >     >     I don't know about protobuf implementations for other
            >> >     languages but I'd
            >> >     >     expect them to offer something compatible.
            >> >     >
            >> >     >     However, this leading varint is an incompatible change and
            >> >     would need to
            >> >     >     be added to the spec.
            >> >     >
            >> >     >     I specifically encountered this with PaymentMessage and
            >> >     PaymentACK, but
            >> >     >     it might be a good idea to apply this to all messages if any.
            >> >     Open for
            >> >     >     discussion.
            >> >     >
            >> >     >
            >> >     >
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            >> 
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            ^ permalink raw reply	[flat|nested] 7+ messages in thread

end of thread, other threads:[~2014-01-27  2:05 UTC | newest]

Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2014-01-26 21:11 [Bitcoin-development] BIP70/71 issue, RFD Andreas Schildbach
2014-01-26 21:24 ` Mike Hearn
2014-01-26 21:32   ` Andreas Schildbach
2014-01-26 22:00     ` Mike Hearn
2014-01-26 22:14       ` Andreas Schildbach
2014-01-26 23:01         ` Mike Hearn
2014-01-27  2:05           ` Gavin

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