External CPU Miner Commandline Tool

How to run (from source):

# Build qkchash-related interfaces after checking out the repo
$ pwd  #-> root directory at `goquarkchain`
$ cd consensus/qkchash/native && make && cd -
$ cd cmd/miner
$ go run main.go -config ../../mainnet/singularity/cluster_config_template.json -shards 1,393217 -host <ip>
# Or build the binary
$ go build -o goqkcminer
$ ./goqkcminer -config ../../mainnet/singularity/cluster_config_template.json -shards 1,393217 -host <ip>

Commandline options:

$ goqkcminer -h
Usage of goqkcminer:
  -coinbase string
        coinbase for miner
  -config string
        cluster config file
  -gethloglvl string
        log level of geth (default "info")
  -host string
        remote host of a quarkchain cluster (default "localhost")
  -port int
        remote JSONRPC port of a quarkchain cluster (default 38391)
  -shards string
        comma-separated string indicating shards (default "R")
  -threads int
        Use how many threads to mine in a worker
  -timeout int
        timeout in seconds for RPC calls (default 10)

Misc:

1. ethash is not supported, due to:
   1. Need to adapt the consensus engine interface from go-ethereum to our own consensus module, because in go-ethereum CPU mining is tightly coupled with the block format while we modified a lot of it. For double-SHA256 and qkchash mining it's solved by only using the header hash, difficulty and block height parameters. Check FindNonce method for more details
   2. Most people are running GPU for mining ethash right now, so supporting CPU mining doesn't really help