[BOUNTY] fix mobile WLCj wallet for android - page 4.

rik8119

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Quote from: achow101 on August 18, 2015, 10:27:02 PM

How does the coin format the merge mining data in the block? Also, is there a block explorer I can use for this coin? That would make it much easier to figure this whole thing out.

The Blockexplorer can be found at: 109.73.173.119:81 (the balances are in satoshi not in wlc).

I try to find out more about the merge mining data in the block, can you specify a little bit what information you need?

achow101

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How does the coin format the merge mining data in the block? Also, is there a block explorer I can use for this coin? That would make it much easier to figure this whole thing out.

achow101

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So I have done some debugging and I found the problem to be at Line 505 in message.java with the line

Code:

System.arraycopy(payload, cursor, b, 0, length);

which is called at line 43 of TransactionInput.java. It appears that the the length passed in is too long since the cursor + length exceeds the length of payload. Either the length passed in is too large, or the cursor is positioned too far back. I will investigate some more the find out.

Edit: The length of the payload is 10430, the cursor is at 10177, and the length is 34966. 34966 + 10177 =45143 > 10430.

hexafraction

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Quote from: achow101 on August 17, 2015, 04:28:06 PM

I think I may have found where the problem is, but I will need to do some testing. This is just from looking at the code. I think it has to do with VarInt and the readVarInt() method in message.java. This method is called to get the length of the array and I think it isn't doing something correctly which causes the length to be too small. I need to check this out with debugging though.

Hexafraction, can you send me the main class that you are using?

readVarInt isn't the culprit, as far as I can tell. It's being called when the array pointer is already pointing in an invalid location. I'll pastebin the main class I'm using shortly.

Edit: http://paste.ubuntu.com/12112739/
It's nothing fancy, but it fetches blocks and gives me a debuggable program. Chain is static so the debugger can easily access it for expression evaluation and conditional breakpoints.

achow101

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I think I may have found where the problem is, but I will need to do some testing. This is just from looking at the code. I think it has to do with VarInt and the readVarInt() method in message.java. This method is called to get the length of the array and I think it isn't doing something correctly which causes the length to be too small. I need to check this out with debugging though.

Hexafraction, can you send me the main class that you are using?

hexafraction

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Quote from: cryptosun on August 15, 2015, 02:23:35 PM

Quote from: hexafraction on August 15, 2015, 02:18:05 PM

Quote from: cryptosun on August 15, 2015, 02:12:26 PM

I can help u PM me

Cryptosun, there's a link to the code. Run it and see if you can fix the issue.

Oh Ok bro:)

Please keep us informed if you manage to make any progress, where I haven't been able to do so.

rik8119

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Quote from: cryptosun on August 15, 2015, 02:23:35 PM

Quote from: hexafraction on August 15, 2015, 02:18:05 PM

Quote from: cryptosun on August 15, 2015, 02:12:26 PM

I can help u PM me

Cryptosun, there's a link to the code. Run it and see if you can fix the issue.

Oh Ok bro:)

Hi cryptosun,

thanks for your offer. Hope you can fix the issue with bitcoin as parent while merge mining.

Rik

cryptosun

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Quote from: hexafraction on August 15, 2015, 02:18:05 PM

Quote from: cryptosun on August 15, 2015, 02:12:26 PM

I can help u PM me

Cryptosun, there's a link to the code. Run it and see if you can fix the issue.

Oh Ok bro:)

hexafraction

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Quote from: cryptosun on August 15, 2015, 02:12:26 PM

I can help u PM me

Cryptosun, there's a link to the code. Run it and see if you can fix the issue.

cryptosun

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I can help u PM me

rik8119

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Quote from: hexafraction on August 14, 2015, 03:25:13 PM

Quote from: achow101 on August 14, 2015, 03:18:08 PM

I have looked at the code and it looks like that the coinj you forked does not have support for merge mining. I would suggest that you fork the java library for something that does support merged mining.

The latest code is a fork of namecoinj and does support merged mining, in theory. It is failing in practice at the moment.

Hi the first blocks after the genesisblock were merge mined with freicoin, so merge mining of namecoinj is working (for freicoin as parent). I looked into BlockMergeMinedPayload.java and it is creating a "new Transaction" for the Parent Block Coinbase Transaction. Maybe the problem is that transactions for my WLC are including refHeight wchich BlockMergeMinedPayload is also using for the Parent header but Bitcoin transactions dont have this parameter and so it stops downloading as soon as Bitcoin is present as parent. But this is just a guess at the moment first i have to learn how to include this main from you inside my testingsetup.

I tried to get to know which hash inside the block belongs to which coin, but i can not see it at the moment.

hexafraction

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Quote from: achow101 on August 14, 2015, 03:30:26 PM

Quote from: hexafraction on August 14, 2015, 03:25:13 PM

Quote from: achow101 on August 14, 2015, 03:18:08 PM

I have looked at the code and it looks like that the coinj you forked does not have support for merge mining. I would suggest that you fork the java library for something that does support merged mining.

The latest code is a fork of namecoinj and does support merged mining, in theory. It is failing in practice at the moment.

It is? The repository linked above is still forked from freicoinj, nor namecoinj. Is there another repository.I could help if I knew what the code is and what coin wlc itself is forked from.

Sure thing, I didn't realize it wasn't linked here. https://github.com/Rikski/namecoinj

I have a fairly trivial main class I'm using for testing. I can post if you need it, but I don't have access to it right this minute (mobile).

achow101

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Just writing some code

Quote from: hexafraction on August 14, 2015, 03:25:13 PM

Quote from: achow101 on August 14, 2015, 03:18:08 PM

I have looked at the code and it looks like that the coinj you forked does not have support for merge mining. I would suggest that you fork the java library for something that does support merged mining.

The latest code is a fork of namecoinj and does support merged mining, in theory. It is failing in practice at the moment.

It is? The repository linked above is still forked from freicoinj, nor namecoinj. Is there another repository.I could help if I knew what the code is and what coin wlc itself is forked from.

hexafraction

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Quote from: achow101 on August 14, 2015, 03:18:08 PM

I have looked at the code and it looks like that the coinj you forked does not have support for merge mining. I would suggest that you fork the java library for something that does support merged mining.

The latest code is a fork of namecoinj and does support merged mining, in theory. It is failing in practice at the moment.

achow101

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Just writing some code

I have looked at the code and it looks like that the coinj you forked does not have support for merge mining. I would suggest that you fork the java library for something that does support merged mining.

hexafraction

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Quote from: rik8119 on August 14, 2015, 08:10:11 AM

Hi hexafraction Block 11418 is the first merged mining block with bitcoin/and other merge mining coins. This should be the reason why the cursor ends up a bigger position.

And i am sorry how do you test the namecoinj on its own? Do you mean with the tests included when compiling?

No, not using the built-in unit tests. I simply imported the namecoinj project into my Java IDE, and added my own class into the samples package, that contained a main method that connected to my WLC C++ client, and began fetching blocks. I also used my IDE's debugger to poke around as to what was going on.

Would you be able to tell me what network block 11418 was merge-mined with, and what the block hash/id is on the other network?

rik8119

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Hi hexafraction Block 11418 is the first merged mining block with bitcoin/and other merge mining coins. This should be the reason why the cursor ends up a bigger position.

And i am sorry how do you test the namecoinj on its own? Do you mean with the tests included when compiling?

hexafraction

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I did a bit more checking. It looks like there's something really wrong parsing the first transaction of block 11418. When it is parsed, the cursor ends up at position 92, and not 80, while all other blocks finish parsing their headers at position 80. I'm not sure why yet. Overriding it didn't seem to help. I'll try tracing back earlier in the block parsing code later when I get the chance.

hexafraction

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Scratch that, my memory was wrong. It always stops at/around block 11418, trying to download the same block over and over. Here's my stacktrace, if anyone more familiar with bitcoinj can take a look:

Code:

03:20:50 13 DownloadListener.onChainDownloadStarted: Chain download switched to [127.0.0.1]:55889
03:20:50 13 ConnectionHandler.handleKey: Error handling SelectionKey: null
03:20:50 13 PeerSocketHandler.exceptionCaught: [127.0.0.1]:55889 - 
org.bitcoinj.core.ProtocolException: Error deserializing message 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

	at org.bitcoinj.core.BitcoinSerializer.deserializePayload(BitcoinSerializer.java:193)
	at org.bitcoinj.core.BitcoinSerializer.deserialize(BitcoinSerializer.java:156)
	at org.bitcoinj.core.PeerSocketHandler.receiveBytes(PeerSocketHandler.java:149)
	at org.bitcoinj.net.ConnectionHandler.handleKey(ConnectionHandler.java:217)
	at org.bitcoinj.net.NioClientManager.handleKey(NioClientManager.java:75)
	at org.bitcoinj.net.NioClientManager.run(NioClientManager.java:111)
	at com.google.common.util.concurrent.AbstractExecutionThreadService$1$2.run(AbstractExecutionThreadService.java:60)
	at com.google.common.util.concurrent.Callables$3.run(Callables.java:93)
	at java.lang.Thread.run(Thread.java:745)
Caused by: org.bitcoinj.core.ProtocolException: java.lang.ArrayIndexOutOfBoundsException
	at org.bitcoinj.core.Message.readBytes(Message.java:513)
	at org.bitcoinj.core.TransactionInput.parse(TransactionInput.java:143)
	at org.bitcoinj.core.Message.(Message.java:118)
	at org.bitcoinj.core.Message.(Message.java:157)
	at org.bitcoinj.core.ChildMessage.(ChildMessage.java:52)
	at org.bitcoinj.core.TransactionInput.(TransactionInput.java:126)
	at org.bitcoinj.core.Transaction.parse(Transaction.java:594)
	at org.bitcoinj.core.Message.(Message.java:118)
	at org.bitcoinj.core.Message.(Message.java:157)
	at org.bitcoinj.core.ChildMessage.(ChildMessage.java:52)
	at org.bitcoinj.core.Transaction.(Transaction.java:242)
	at org.bitcoinj.core.Block.parseTransactions(Block.java:263)
	at org.bitcoinj.core.Block.parse(Block.java:279)
	at org.bitcoinj.core.Message.(Message.java:118)
	at org.bitcoinj.core.Message.(Message.java:157)
	at org.bitcoinj.core.Block.(Block.java:132)
	at org.bitcoinj.core.BitcoinSerializer.makeMessage(BitcoinSerializer.java:206)
	at org.bitcoinj.core.BitcoinSerializer.deserializePayload(BitcoinSerializer.java:191)
	... 8 more
Caused by: java.lang.ArrayIndexOutOfBoundsException
	at org.bitcoinj.core.Message.readBytes(Message.java:509)
	... 25 more
03:20:50 13 PeerGroup.handlePeerDeath: [127.0.0.1]:55889: Peer died
03:20:50 13 PeerGroup.handlePeerDeath: Download peer died. Picking a new one.
03:20:50 13 PeerGroup.setDownloadPeer: Unsetting download peer: [127.0.0.1]:55889
03:20:50 13 ConnectionHandler.handleKey: Error handling SelectionKey: null
Peer #0 disconnected: [127.0.0.1]:55889

C++ client debug.log (with some extra debug statements of my own):

Code:

2015-08-13 19:22:15 disconnecting node 127.0.0.1:57487                                                                    [51/9435]
2015-08-13 19:22:15 [hexdbg] sending MSG_BLOCK
2015-08-13 19:22:15 trying connection 104.131.12.128:55889 lastseen=25.5hrs
2015-08-13 19:22:20 accepted connection 127.0.0.1:57490
2015-08-13 19:22:20 accepted connection 127.0.0.1:57491
2015-08-13 19:22:20 received: version (113 bytes)
2015-08-13 19:22:20 send version message: version 70001, blocks=21379, us=74.70.116.138:55889, them=0.0.0.0:0, peer=127.0.0.1:57490
2015-08-13 19:22:20 receive version message: /WorldleadcurrencyJ:0.12.2/: version 70001, blocks=11417, us=127.0.0.1:55889, them=127
.0.0.1:55889, peer=127.0.0.1:57490
2015-08-13 19:22:20 received: version (113 bytes)
2015-08-13 19:22:20 send version message: version 70001, blocks=21379, us=74.70.116.138:55889, them=0.0.0.0:0, peer=127.0.0.1:57491
2015-08-13 19:22:20 receive version message: /WorldleadcurrencyJ:0.12.2/: version 70001, blocks=11417, us=127.0.0.1:55889, them=127
.0.0.1:55889, peer=127.0.0.1:57491
2015-08-13 19:22:20 received: verack (0 bytes)
2015-08-13 19:22:20 received: verack (0 bytes)
2015-08-13 19:22:20 received: ping (8 bytes)
2015-08-13 19:22:20 received: getblocks (3269 bytes)
2015-08-13 19:22:20 getblocks 11418 to 0000000000000000000000000000000000000000000000000000000000000000 limit 500
2015-08-13 19:22:20   getblocks stopping at limit 11917 089e5f2f0ea7e20da7169714203c64a3105b0ea7fcd825790f4430c0445c59c2
2015-08-13 19:22:20 received: ping (8 bytes)
2015-08-13 19:22:20 connection timeout
2015-08-13 19:22:20 received: getdata (18003 bytes)
2015-08-13 19:22:20 received getdata (500 invsz)
2015-08-13 19:22:20 [hexdbg] processing getdata
2015-08-13 19:22:20 [hexdbg] sending MSG_BLOCK
2015-08-13 19:22:20 [hexdbg] processing getdata
2015-08-13 19:22:20 [hexdbg] sending MSG_BLOCK
2015-08-13 19:22:20 [hexdbg] processing getdata
2015-08-13 19:22:20 [hexdbg] sending MSG_BLOCK
2015-08-13 19:22:20 [hexdbg] processing getdata
2015-08-13 19:22:20 [hexdbg] sending MSG_BLOCK
2015-08-13 19:22:20 [hexdbg] processing getdata
2015-08-13 19:22:20 [hexdbg] sending MSG_BLOCK
2015-08-13 19:22:20 [hexdbg] processing getdata
2015-08-13 19:22:20 [hexdbg] sending MSG_BLOCK
2015-08-13 19:22:20 [hexdbg] processing getdata
2015-08-13 19:22:20 [hexdbg] sending MSG_BLOCK
2015-08-13 19:22:20 [hexdbg] processing getdata
2015-08-13 19:22:20 [hexdbg] sending MSG_BLOCK
2015-08-13 19:22:20 [hexdbg] processing getdata
2015-08-13 19:22:20 [hexdbg] sending MSG_BLOCK
2015-08-13 19:22:20 [hexdbg] processing getdata
2015-08-13 19:22:20 socket send error 104
2015-08-13 19:22:20 disconnecting node 127.0.0.1:57491

Also, it looks like you're already trying to test on Android. I suggest just testing your namecoinj fork by itself first, and then trying to integrate it as a library into an Android application once it's working on its own.

hexafraction

sr. member

Activity: 392

Merit: 268

Tips welcomed: 1CF4GhXX1RhCaGzWztgE1YZZUcSpoqTbsJ

Looks like you're getting an out of memory error. I'll pull code and try it myself. I'm getting a different error, due to some messages from the C++ client being apparently malformed. My sync consistently stops somewhere between 12000 and 16000.

Topic: [BOUNTY] fix mobile WLCj wallet for android - page 4. (Read 7371 times)