eth-index 0.4.1

Indexer for the ethereum blockchain

eth-index

eth-index is an indexer for events on the ethereum blockchain. It imports events into a postgresql database. It’s a companion to the trustlines project relay server component.

Installation

Before trying to install py-eth-index, make sure you have the postgresql development header files and library installed. On debian based systems this can be done by running:

apt install libpq-dev

eth-index uses python 3.8 or up. Please make sure you have the required version installed.

Please checkout the source code from github, cd into the checked out repo and run the folllowing pip command with a fresh virtualenv:

pip install -c constraints.txt  .

Note

On Mac Big Sur - if the installation is failing due to compilation errros, make sure that you use openssl, readline, zlib, sqlite libs from brew and not the one that come bundles with Mac OS. Make sure your LDFLAGS and CPPFLAGS are properly set. For more info read here: https://github.com/psycopg/psycopg2/issues/1200

Development

A complete development environment can be installed with:

pip install -c constraints.txt -r requirements.txt
pip install -c constraints.txt -e .

This installs black, flake8, mypy and tox among other things.

black

The source code is formatted with black. If you choose not to use the pre-commit hook, you should be able to format the source code with black setup.py src.

flake8

We use flake8 to check for errors. Run flake8 src to check for errors.

mypy

mypy is used to check for type errors. Run mypy --ignore-missing-imports src to check manually.

tox

Running tox will run black, flake8, mypy and pytest locally.

Since we also do run some tests for postgres, the postgres database server must be installed on the local machine. It doesn’t have to be started though, since the tests do start postgres with a temporary data directory.

On a debian based system apt install postgresql will install the postgresql database.

pre-commit

The repository comes with a configuration file for pre-commit. pre-commit will be installed as part of the development dependencies specified in requirements.txt. The git commit hooks can be activated with pre-commit install inside the py-eth-index repository.

Initializing the database

Please setup a working postgres environment, i.e. set the PG* environment variables and configure ~/.pgpass.

Then run

ethindex createtables

to create the database tables.

ethindex

ethindex is a command line program that is being used to run the actual syncing process. It also uses the PG* variables in order to determine the postgres server to connect to.

ethindex importabi

Before importing events into the postgres database, the ABIs must be known.

ethindex importabi can be used to import ABIs into the postgres database. By default it reads the json file addresses.json from the current directory and adds the default abi for currency networks to the abis table. A custom abi file can be provided via --contracts option. The location of the addresses.json file can be specified via the --addresses command line argument.

Usage:

Usage: ethindex importabi [OPTIONS]

Options:
  --addresses TEXT
  --contracts TEXT
  --help            Show this message and exit.

ethindex runsync

ethindex runsync will start the actual synchronization process. On the first start it will read all of the abis and create one entry in the sync table containing all contract addresses. It then imports all of the events into the postgres table events.

Usage

Usage: ethindex runsync [OPTIONS]

Options:
  --jsonrpc TEXT                  jsonrpc URL to use
  --required-confirmations INTEGER
                                  number of confirmations until we consider a
                                  block final
  --waittime INTEGER              time to sleep in milliseconds waiting for a
                                  new block
  --startblock INTEGER            Block from where events should be synced
  --syncid TEXT                   syncid to use
  --merge-with-syncid TEXT        syncid to merge with
  --help                          Show this message and exit.

Adding new contracts

Import the contracts using the ethindex importabi command. Then synchronize these contracts and merge them with the default syncid with something like the following command:

ethindex runsync --syncid new --merge-with-syncid default

This command will synchronize all contracts, which aren’t already synchronized for the default syncid and will merge the new syncid into the default syncid, when both of them are fully synchronized with the chain. This means that a runsync job has to be running for default.

Status and Limitations

• ethindex is alpha software.

Change log

See CHANGELOG.