- How to deploy Toshi to an Amazon AWS instance with Redis and PostgreSQL using Docker.
- How to query the data to gain insights into the Blockchain
To get the most out of this post you will need some basic familiarity with Linux, SQL and AWS.
Most Bitcoin nodes run “Bitcoin Core”, which is written in C++ and serves as the de-facto standard implementation of the Bitcoin protocol. Its advantages are that it is fast for light-medium use and efficiently stores the transaction history of the network (the blockchain) in LevelDB, a key-value datastore developed at Google. It has wallet management features and an easy-to-use JSON RPC interface for communicating with other applications.
However, Bitcoin Core has some shortcomings that make it difficult to use for wallet/address management in at-scale applications. Its database, although efficient, makes it impossible or very difficult to perform certain queries on the blockchain. For example, if you wanted to get the balance of any bitcoin address, you would have to write a script to parse the blockchain separately to find the answer. Additionally, Bitcoin Core starts to significantly slow down when it has to manage and monitor large amounts of addresses (> ~10^7). For a web app with hundreds of thousands of users, each regularly generating new addresses, Bitcoin Core is not ideal.
Toshi attempts to address the flexibility and scalability issues facing Bitcoin Core by parsing and storing the entire blockchain in an easily-queried PostgreSQL database. Here is a list of tables in Toshi’s DB:
We will see the direct benefit of this structure when we start querying our data to gain insights from the blockchain. Since Toshi is written in Ruby it has the added advantage of being developer friendly and easy to customize. The main downside of Toshi is the need for ~10x more storage than Bitcoin core, as storing and indexing the blockchain in well-indexed relational DB requires significantly more disk space.
First we will create an instance on Amazon AWS. You will need at least 300GB of storage for the Postgres database.
Be sure to auto assign a public IP and allow TLS incoming connections on Port 5000, as this is how we will access the Toshi web interface.
Once you get your instance up and running, SSH into the instance using the commands given by Amazon. First we will set up a user for Toshi:
ubuntu@ip-172-31-62-77:~$ sudo adduser toshi Adding user `toshi' ... Adding new group `toshi' (1001) ... Adding new user `toshi' (1001) with group `toshi' ... Creating home directory `/home/toshi' ... Copying files from `/etc/skel' ... Enter new UNIX password: Retype new UNIX password: passwd: password updated successfully Changing the user information for toshi Enter the new value, or press ENTER for the default Full Name : Room Number : Work Phone : Home Phone : Other : Is the information correct? [Y/n] Y
Then we will add the new user to the sudoers group and switch to that user:
ubuntu@ip-172-31-62-77:~$ sudo adduser toshi sudo Adding user `toshi' to group `sudo' ... Adding user toshi to group sudo Done. ubuntu@ip-172-31-62-77:~$ su – toshi toshi@ip-172-31-62-77:~$
Next, we will install Docker and all of its dependencies through an automated script available on the Docker website. This will provision our instance with the necessary software packages.
toshi@ip-172-31-62-77:~$ curl -sSL https://get.docker.com/ubuntu/ | sudo sh Executing: gpg --ignore-time-conflict --no-options --no-default-keyring --homedir .....
Then we will clone the Toshi repo from Github and move into the new directory:
toshi@ip-172-31-62-77:~$ git clone https://github.com/coinbase/toshi.gittoshi@ip-172-31-62-77:~$ cd toshi/
Next, build the coinbase/toshi Docker image from the Dockerfile located in the /toshi directory. Don’t forget the dot at the end of the command!!
toshi@ip-172-31-62-77:~/toshi$ sudo docker build -t=coinbase/toshi .Sending build context to Docker daemon 13.03 MB Sending build context to Docker daemon … … … Removing intermediate container c15dd6c961c2 Step 3 : ADD Gemfile /toshi/Gemfile INFO Error getting container dbc7c41625c49d99646e32c430b00f5d15ef867b26c7ca68ebda6aedebf3f465 from driver devicemapper: Error mounting '/dev/mapper/docker-202:1-524950-dbc7c41625c49d99646e32c430b00f5d15ef867b26c7ca68ebda6aedebf3f465' on '/var/lib/docker/devicemapper/mnt/dbc7c41625c49d99646e32c430b00f5d15ef867b26c7ca68ebda6aedebf3f465': no such file or directory
Note, you might see ‘Error getting container’ when this runs. If so don’t worry about it at this point.
Next, we will build and run our Redis and Postgres containers.
toshi@ip-172-31-62-77:~/toshi$ sudo docker run --name toshi_db -d postgres toshi@ip-172-31-62-77:~/toshi$ sudo docker run --name toshi_redis -d redis
This will build and run Docker containers named toshi_db and toshi_redis based on standard postgres and redis images pulled from Dockerhub. The ‘-d’ flag indicates that the container will run in the background (daemonized). If you see ‘Error response from daemon: Cannot start container’ error while running either of these commands, simply run ‘sudo docker start toshi_redis [or toshi_postgres]’ again.
To ensure that our containers are running properly, run:
toshi@ip-172-31-62-77:~$ sudo docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 4de43ccc8e80 redis:latest "/entrypoint.sh redi 7 minutes ago Up 3 minutes 6379/tcp toshi_redis 6de0418d4e91 postgres:latest "/docker-entrypoint. 8 minutes ago Up 2 minutes 5432/tcp toshi_db
You should see both containers running, along with their port numbers.
When we run our Toshi container we need to tell it where to find the Postgres and Redis containers, so we must find the toshi_db and toshi_redis IP addresses. Remember we have not run a Toshi container yet, we only built the image from the Dockerfile. You can think of a container as a running version of an image. To learn more about Docker see the docs.
toshi@ip-172-31-62-77:~$ sudo docker inspect toshi_db | grep IPAddress "IPAddress": "172.17.0.3", toshi@ip-172-31-62-77:~$ sudo docker inspect toshi_redis | grep IPAddress "IPAddress": "172.17.0.2",
Now we have everything we need to get our Toshi container up and running. To do this run:
sudo docker run --name toshi_main -d -p 5000:5000 -e REDIS_URL=redis://172.17.0.2:6379 -e DATABASE_URL=postgres://postgres:@172.17.0.3:5432 -e TOSHI_ENV=production coinbase/toshi sh -c 'bundle exec rake db:create db:migrate; foreman start'
Be sure to replace the IP addresses in the above command with your own.
This creates a container named ‘toshi_main’, runs it as a daemon (-d) and sets three environment variables in the container (-e) which are required for Toshi to run. It also maps port 5000 inside the container to port 5000 of our host (-p). Lastly it runs a shell script in the container (sh –c) which creates and migrates the database, then starts the Toshi web server.
To see that it has started properly run:
toshi@ip-172-31-62-77:~$ sudo docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 017c14cbf432 coinbase/toshi:latest "sh -c 'bundle exec 6 seconds ago Up 5 seconds 0.0.0.0:5000->5000/tcp toshi_main 4de43ccc8e80 redis:latest "/entrypoint.sh redi 43 minutes ago Up 38 minutes 6379/tcp toshi_redis 6de0418d4e91 postgres:latest "/docker-entrypoint. 43 minutes ago Up 38 minutes 5432/tcp toshi_db
If you have set your AWS security settings properly, you should be able to see the syncing progress of Toshi in your browser. Find your instance’s public IP address from the AWS console and then point your browser there using port 5000. For example: ‘http://220.127.116.11:5000/’.
You can also see the logs of our Toshi container by running:
toshi@ip-172-31-62-77:~$ sudo docker logs –f toshi_main
That’s it! We’re all up and running. Be prepared to wait a long time for the blockchain to finish syncing. This could take more than a week or two, but you can start playing around with the data right away through the GUI to get a sense of the power you now have.
About the Author
Alex Leishman is a software engineer who is passionate about Bitcoin and other digital currencies. He works at MaiCoin.com where he is helping to build the future of money.