[feature request]bolt v2 support #22
Description
Support bolt v2 codec.
the mainly change in bolt v2 is to support optional crc32 verification.
Spec:
Request command protocol for v2
** request definition **
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+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+------+-----+-----+-----+-----+
|proto| ver1|type | cmdcode |ver2 | requestId |codec|switch| timeout |
+-----------+-----------+-----------+-----------+-----------+------------+-----------+-----------+
|classLen |headerLen |contentLen | ... |
+-----------+-----------+-----------+-----------+ +
| className + header + content bytes |
+ +
| ... ... | CRC32(optional) |
+------------------------------------------------------------------------------------------------+
Response command protocol for v2
** response definition **
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+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+------+-----+-----+-----+-----+
|proto| ver1| type| cmdcode |ver2 | requestId |codec|switch|respstatus | classLen |
+-----------+-----------+-----------+-----------+-----------+------------+-----------+-----------+
|headerLen | contentLen | ... |
+-----------------------------------+ +
| className + header + content bytes |
+ +
| ... ... | CRC32(optional) |
+------------------------------------------------------------------------------------------------+
respstatus: response status