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Building the Oracle Server

The Oracle Server is a DLC Oracle with functionality for creating events and attesting to them. You can interact with the oracle server with bitcoin-s-cli or curl

The following a guide is for how to build the oracle server. If you are looking for the documentation on how to use the oracle server, checkout this page.

Step 1: Java and Scala

To get started you will need Java, Scala, and some other nice tools installed, luckily the Scala team has an easy setup process!

Simply follow the instructions in this short blog to get started.

Step 2: Bitcoin-S Repository

Now, it is time to clone the Bitcoin-S repository by running

git clone --depth 100 --recursive [email protected]:bitcoin-s/bitcoin-s.git

or alternatively, if you do not have ssh setup with github, you can run

git clone --depth 100 --recursive https://github.com/bitcoin-s/bitcoin-s.git

Next, you will want to execute the commands

cd bitcoin-s
git submodule update

to download the secp256k1 submodule, this is so cryptographic functions like signing will be faster.

Step 3: Building the Oracle Server

Java Binary

You can build the oracle server with the sbt native packager. The native packager offers numerous ways to package the project.

In this example we are going to use universal:stage which will produce bash scripts we can easily execute. You can stage the server with the following command.

sbt oracleServer/universal:stage

This will produce a script to execute bitcoin-s which you can start with

./app/oracle-server/target/universal/stage/bin/bitcoin-s-oracle-server

Alternatively you can run the server by just using:

sbt oracleServer/run

Docker

Using an existing docker image

We publish docker images on every PR that is merged to bitcoin-s.

You can find the docker repo for the oracle server here

Building our own docker image

You can build a docker image with the following commands

sbt "oracleServer/docker:stage"

This will build a Dockerfile that is located in app/oracle-server/target/docker/stage

You can publish to your local docker repository by using docker:publishLocal instead of docker:stage

You can now build the docker image with

docker build app/oracle-server/target/docker/stage/ -t bitcoin-s-oracle-server:latest

Finally, let's run the image! It's important that you correctly configure port forwarding with the docker container so you can interact with the running container with bitcoin-s-cli or curl. By default, our oracle server listens for requests on port 9998.

This means we need to forward requests on the host machine to the docker container correctly.

This can be done with the following command

docker run -d -p 9998:9998 bitcoin-s-oracle-server:latest

Now you can send requests with bitcoin-s-cli or curl. Here is an example with bitcoin-s-cli

./bitcoin-s-cli getpublickey
c9c9fe2772330b0d61a2efbfacabf5cab1137710a69f0e12f1eb3dbb74f7ea54

For more information on build configuration options with sbt please see the sbt native packager docs

Step 4: Configuration

Java binary configuration

If you would like to pass in a custom datadir for your server, you can do

./app/oracle-server/target/universal/stage/bin/bitcoin-s-oracle-server --datadir /path/to/datadir/

To use a config file that is not the bitcoin-s.conf file in your datadir, you can do

./app/oracle-server/target/universal/stage/bin/bitcoin-s-oracle-server --conf /path/to/file.conf

You can also pass in a custom rpcport to bind to

./app/oracle-server/target/universal/stage/bin/bitcoin-s-oracle-server --rpcport 12345

For more information on configuring the server please see our configuration document.

For more information on how to use our built in cli to interact with the server please see the cli docs.

Docker configuration

In this example, we are using the latest docker image published to our docker hub which is referenced by bitcoinscala/bitcoin-s-oracle-server:latest

You can use bitcoin-s with docker volumes. You can also pass in a custom configuration at container runtime.

Using a docker volume

docker volume create bitcoin-s
docker run -p 9998:9998 \
--mount source=bitcoin-s,target=/home/bitcoin-s/ bitcoinscala/bitcoin-s-oracle-server:latest

Now you can re-use this volume across container runs. It will keep the same oracle database and seeds directory located at /home/bitcoin-s/.bitcoin-s/seeds in the volume.

Using a custom bitcoin-s configuration with docker

You can also specify a custom bitcoin-s configuration at container runtime. You can mount the configuration file on the docker container and that configuration will be used in the docker container runtime rather than the default one we provide here

You can do this with the following command

docker run -p 9998:9998 \
--mount type=bind,source=/my/new/config/,target=/home/bitcoin-s/.bitcoin-s/ \
bitcoinscala/bitcoin-s-oracle-server:latest --conf /home/bitcoin-s/.bitcoin-s/bitcoin-s.conf

Note: If you adjust the bitcoin-s.oracle.rpcport setting you will need to adjust the -p 9998:9998 port mapping on the docker container to adjust for this.

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