12876290e4 | ||
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bchain | ||
db | ||
server | ||
.gitignore | ||
Gopkg.lock | ||
Gopkg.toml | ||
README.md | ||
blockbook.go |
README.md
blockbook
Install
Setup go environment (Debian 9):
sudo apt-get install git
apt-get install -y pkg-config lxc-dev
wget https://storage.googleapis.com/golang/go1.9.2.linux-amd64.tar.gz
sudo mv go /usr/local
sudo ln -s /usr/local/go/bin/go /usr/bin/go
go help gopath
Install RocksDB: https://github.com/facebook/rocksdb/blob/master/INSTALL.md
sudo apt-get install libgflags-dev libsnappy-dev zlib1g-dev libbz2-dev liblz4-dev
git clone https://github.com/facebook/rocksdb.git
cd rocksdb
make static_lib
Install gorocksdb: https://github.com/tecbot/gorocksdb
CGO_CFLAGS="-I/path/to/rocksdb/include" \
CGO_LDFLAGS="-L/path/to/rocksdb -lrocksdb -lstdc++ -lm -lz -lbz2 -lsnappy -llz4" \
go get github.com/tecbot/gorocksdb
Install ZeroMQ: https://github.com/zeromq/libzmq
Install Go interface to ZeroMQ:
go get github.com/pebbe/zmq4
Install additional go libraries - glog logging, socket.io:
go get github.com/golang/glog
go get github.com/graarh/golang-socketio
Install blockbook:
cd $GOPATH/src
git clone https://github.com/jpochyla/blockbook.git
cd blockbook
go build
Usage
$GOPATH/bin/blockbook --help
Data storage in RocksDB
Blockbook stores data the key-value store RocksDB. Data are stored in binary form to save space. The data are separated to different column families:
-
default
at the moment not used, will store statistical data etc.
-
height - maps block height to block hash
Block heigh stored as array of 4 bytes (big endian uint32)
Block hash stored as array of 32 bytesExample - the first four blocks (all data hex encoded)
0x00000000 : 0x000000000933ea01ad0ee984209779baaec3ced90fa3f408719526f8d77f4943
0x00000001 : 0x00000000b873e79784647a6c82962c70d228557d24a747ea4d1b8bbe878e1206
0x00000002 : 0x000000006c02c8ea6e4ff69651f7fcde348fb9d557a06e6957b65552002a7820
0x00000003 : 0x000000008b896e272758da5297bcd98fdc6d97c9b765ecec401e286dc1fdbe10
-
outputs - maps output script+block height to array of outpoints
Output script (ScriptPubKey)+block height stored as variable length array of bytes for output script + 4 bytes (big endian uint32) block height
array of outpoints stored as array of 32 bytes for transaction id + variable length outpoint index for each outpointExample - (all data hex encoded)
0x001400efeb484a24a1c1240eafacef8566e734da429c000e2df6 : 0x1697966cbd76c75eb9fc736dfa3ba0bc045999bab1e8b10082bc0ba546b0178302
0xa9143e3d6abe282d92a28cb791697ba001d733cefdc7870012c4b1 : 0x7246e79f97b5f82e7f51e291d533964028ec90be0634af8a8ef7d5a903c7f6d301
-
inputs - maps transaction outpoint to input transaction that spends it
Transaction outpoint stored as array of 32 bytes for transaction id + variable length outpoint index
Input transaction stored as array of 32 bytes for transaction id + variable length input indexExample - (all data hex encoded)
0x7246e79f97b5f82e7f51e291d533964028ec90be0634af8a8ef7d5a903c7f6d300 : 0x0a7aa90ea0269c79f844c516805e4cac594adb8830e56fca894b66aab19136a428
0x7246e79f97b5f82e7f51e291d533964028ec90be0634af8a8ef7d5a903c7f6d301 : 0x4303a9fcfe6026b4d33ba488df6443c9a99bca7b7fcb7c6f6cd65cea24a749b700
Todo
mempool - return also input transactionsblockchain - return inputs from mempool- do not return duplicate txids
- limit number of transactions returned by rocksdb.GetTransactions - probably by return value from callback function
- legacy socket.io JSON interface
- protobuf websocket interface
- stream results to REST and websocket interfaces
- parallel sync - rewrite - it is not possible to gracefully stop it now, can leave holes in the block
parallel sync - let rocksdb to compact itself from time to time, otherwise it consumes too much disk spacedisconnect blocks - optimize - full range scan is too slow and takes too much disk space (creates snapshot of the whole outputs), split to multiple iterators- disconnect blocks - keep map of transactions in the last 100 blocks
- xpub index
- tests