blockbook

Install using Docker:

git clone https://github.com/jpochyla/blockbook.git
cd blockbook/docker
./build.sh

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 and compile the static_lib and tools

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 release

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:

go get github.com/golang/glog
go get github.com/martinboehm/golang-socketio
go get github.com/btcsuite/btcd
go get github.com/gorilla/handlers
go get github.com/bsm/go-vlq
go get github.com/gorilla/handlers
go get github.com/gorilla/mux
go get github.com/pebbe/zmq4
go get github.com/pkg/profile

Install blockbook:

cd $GOPATH/src
git clone https://github.com/jpochyla/blockbook.git
cd blockbook
go build

Usage

./blockbook --help

Example command

To run blockbook with fast synchronization, connection to ZeroMQ and providing https and socket.io interface, with database in local directory data and connected to local bitcoind at http://localhost:8332 with user rpc/rpc:

./blockbook -sync -parse -httpserver=127.0.0.1:8333 -socketio=127.0.01:8334 -certfile=server/testcert -zeromq=tcp://127.0.0.1:28332

Blockbook logs only to stderr, logging to files is disabled. Verbosity of logs can be tuned by command line parameters -v and -vmodule, details at https://godoc.org/github.com/golang/glog

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 bytes

  Example - 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 outpoint

  Example - (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 index

  Example - (all data hex encoded)

0x7246e79f97b5f82e7f51e291d533964028ec90be0634af8a8ef7d5a903c7f6d300 : 0x0a7aa90ea0269c79f844c516805e4cac594adb8830e56fca894b66aab19136a428
0x7246e79f97b5f82e7f51e291d533964028ec90be0634af8a8ef7d5a903c7f6d301 : 0x4303a9fcfe6026b4d33ba488df6443c9a99bca7b7fcb7c6f6cd65cea24a749b700

Todo

• mempool - return also input transactions
• blockchain - 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 space
• disconnect 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