mcd_transformers

README

MakerDAO VulcanizeDB Transformers

About

Vulcanize DB is a set of tools that make it easier for developers to write application-specific indexes and caches for dapps built on Ethereum.

Dependencies

• Go 1.11+
• Postgres 11
• Ethereum Node
  • Go Ethereum (1.8.23)
  • Parity 1.8.11+

Project Setup

Using Vulcanize for the first time requires several steps be done in order to allow use of the software. The following instructions will offer a guide through the steps of the process:

1. Fetching the project
2. Installing dependencies
3. Configuring shell environment
4. Database setup
5. Configuring synced Ethereum node integration
6. Data syncing

Installation

In order to fetch the project codebase for local use or modification, install it to your GOPATH via:

go get github.com/vulcanize/vulcanizedb go get gopkg.in/DataDog/dd-trace-go.v1/ddtrace

Once fetched, dependencies can be installed via go get or (the preferred method) at specific versions via golang/dep, the prototype golang pakcage manager. Installation instructions are here.

In order to install packages with dep, ensure you are in the project directory now within your GOPATH (default location is ~/go/src/github.com/vulcanize/vulcanizedb/) and run:

dep ensure

After dep finishes, dependencies should be installed within your GOPATH at the versions specified in Gopkg.toml.

Lastly, ensure that GOPATH is defined in your shell. If necessary, GOPATH can be set in ~/.bashrc or ~/.bash_profile, depending upon your system. It can be additionally helpful to add $GOPATH/bin to your shell's $PATH.

Setting up the Database

1. Install Postgres

2. Create a superuser for yourself and make sure psql --list works without prompting for a password.

3. createdb vulcanize_public

4. cd $GOPATH/src/github.com/vulcanize/vulcanizedb

5. Run the migrations: make migrate HOST_NAME=localhost NAME=vulcanize_public PORT=5432

   • To rollback a single step: make rollback NAME=vulcanize_public
   • To rollback to a certain migration: make rollback_to MIGRATION=n NAME=vulcanize_public
   • To see status of migrations: make migration_status NAME=vulcanize_public
   • See below for configuring additional environments

Setting up GraphQL frontend

The database migrations sets up prerequisites for a GraphQL API, which can be generated with Postgraphile. To present the API as specified here:

1. Install Postgraphile: npm install -g postgraphile
2. Invoke postgraphile --connection postgres://[superuser]:[password]@localhost:5432/vulcanize_public --schema api --disable-default-mutations --no-ignore-rbac --watch --enhance-graphiql
3. The GraphiQL frontend can be found at localhost:5000/graphiql, and the GraphQL endpoint at /graphql

Configuration

• To use a local Ethereum node, copy environments/public.toml.example to environments/public.toml and update the ipcPath and levelDbPath.

  • ipcPath should match the local node's IPC filepath:

    • For Geth:

      • The IPC file is called geth.ipc.
      • The geth IPC file path is printed to the console when you start geth.
      • The default location is:
        • Mac: <full home path>/Library/Ethereum
        • Linux: <full home path>/ethereum/geth.ipc

    • For Parity:

      • The IPC file is called jsonrpc.ipc.
      • The default location is:
        • Mac: <full home path>/Library/Application\ Support/io.parity.ethereum/
        • Linux: <full home path>/local/share/io.parity.ethereum/

  • levelDbPath should match Geth's chaindata directory path.

    • The geth LevelDB chaindata path is printed to the console when you start geth.
    • The default location is:
      • Mac: <full home path>/Library/Ethereum/geth/chaindata
      • Linux: <full home path>/ethereum/geth/chaindata
    • levelDbPath is irrelevant (and coldImport is currently unavailable) if only running parity.

• See environments/infura.toml to configure commands to run against infura, if a local node is unavailable.

• Copy environments/local.toml.example to environments/local.toml to configure commands to run against a local node such as Ganache or ganache-cli.

Start syncing with postgres

Syncs VulcanizeDB with the configured Ethereum node, populating blocks, transactions, receipts, and logs. This command is useful when you want to maintain a broad cache of what's happening on the blockchain.

1. Start Ethereum node (if fast syncing your Ethereum node, wait for initial sync to finish)
2. In a separate terminal start VulcanizeDB:
   • ./vulcanizedb sync --config <config.toml> --starting-block-number <block-number>

Alternatively, sync from Geth's underlying LevelDB

Sync VulcanizeDB from the LevelDB underlying a Geth node.

1. Assure node is not running, and that it has synced to the desired block height.
2. Start vulcanize_db
   • ./vulcanizedb coldImport --config <config.toml>
3. Optional flags:
   • --starting-block-number <block number>/-s <block number>: block number to start syncing from
   • --ending-block-number <block number>/-e <block number>: block number to sync to
   • --all/-a: sync all missing blocks

Alternatively, only sync the headers

Syncs VulcanizeDB with the configured Ethereum node, populating only block headers. This command is useful when you want a minimal baseline from which to track targeted data on the blockchain (e.g. individual smart contract storage values).

1. Start Ethereum node
2. In a separate terminal start VulcanizeDB:
   • ./vulcanizedb headerSync --config <config.toml> --starting-block-number <block-number>

Continuously sync Maker event logs from header sync

Continuously syncs Maker event logs from the configured Ethereum node based on the populated block headers. This includes logs related to auctions, multi-collateral dai, and price feeds. This command requires that the headerSync process is also being run so as to be able to sync in real time.

1. Start Ethereum node (or plan to configure the commands to point to a remote IPC path).
2. In a separate terminal run the headerSync command (see above).
3. In another terminal window run the continuousLogSync command:

• ./vulcanizedb continuousLogSync --config <config.toml>
• An option --transformers flag may be passed to the command to specific which transformers to execute, this will default to all transformers if the flag is not passed.
  • ./vulcanizedb continuousLogSync --config environments/private.toml --transformers="priceFeed"
  • see the buildTransformerInitializerMap method in cmd/continuousLogSync.go for available transformers

Backfill Maker event logs from header sync

Backfills Maker event logs from the configured Ethereum node based on the populated block headers. This includes logs related to auctions, multi-collateral dai, and price feeds. This command requires that a header sync (see command above) has previously been run.

Since auction/mcd contracts have not yet been deployed, this command will need to be run a local blockchain at the moment. As such, a new environment file will need to be added. See environments/local.toml.example.

1. Start Ethereum node
2. In a separate terminal run the backfill command:

• ./vulcanizedb backfillMakerLogs --config <config.toml>

Running the Tests

• make test will run the unit tests and skip the integration tests
• make integrationtest will run the just the integration tests

Deploying

1. you will need to make sure you have ssh agent running and your ssh key added to it. instructions here
2. go get -u github.com/pressly/sup/cmd/sup
3. sup staging deploy