Fixes bug where decodeRawTransaction always failed #24
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Instead of adding the JSON that was unparsable to the error message, add the actual error generated by Aeson so you can inspect why the JSON was unparsable.
The bitcoind RPC interface doesn't send a "hex" field at least since version 0.7. This patch makes the parsing of the "hex" field optional, and in either case, always stores the raw transaction object; this is to remain API compatible. In long term, we might want to get rid of the decRaw field of DecodedRawTransaction since it is redundant.
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Bitcoin's rpc command
decoderawtransactionhasn't sent ahexfield for a very long time; as far as my code archaeology allowed, I wasn't able to find anyhexoutput field for decoderawtransaction since at least version 0.7: https://github.com/bitcoin/bitcoin/blob/0.7.2/src/rpcrawtransaction.cpp#L47This pull request makes the parsing of the
hexfield optional, and hard-codes the storage of the raw transaction in this field. I would personally opt for removing the decRaw field entirely, since I cannot see it being used at all (since the parsing must have been failing at least since bitcoin 0.7).