Indexer for Ethereum to get transaction list by ETH address

Known Ethereum nodes lack functionality to get transaction list for ETH address (account). This Indexer allows to explore transactions by Ethereum address and obtain a history of any user|wallet in just a move, like Etherscan does.

Indexer is written in Python. It works as a service in background:

• connects to Ethereum node (works well with geth or parity, others are not tested)
• stores all transactions in Postgres database
• provides data for API to get transactions by address

Stored information

All indexed transactions includes (database field names shown):

• time is a transaction's timestamp
• fr indicates from (sender) Ethereum address
• to indicates to (recepient) Ethereum address
• value stores value of ETH transaction
• gas indicates gasUsed
• gasprice indicates gasPrice
• blockid is a transaction's block number
• txhash is a transaction's hash
• contract_to indicates recepient's Ethereum address in case of contract
• contract_value stores value of ERC20 transaction in its tokens

An example:

{
  "time": 1576008898,
  "txfrom": "0x6B924750e56A674A2Ad01FBF09C7c9012f16f094",
  "txto": "0x1143E097e134F3407eF6B088672CCECE9A4f8CDD",
  "gas": 21000,
  "gasprice": 2500000000,
  "block": 9084957,
  "txhash": "\\xcf56a031dfc89f5a3686cd441ea97ae96a66f5809a4c8c1b370485a04fb37e0e",
  "value": 1200000000000000,
  "contract_to": "",
  "contract_value": ""
}

Refers to transaction 0xcf56a031dfc89f5a3686cd441ea97ae96a66f5809a4c8c1b370485a04fb37e0e.

Details and configuration

Indexer script ethsync.py is recommended to be run as a background service. Log is stored in /var/log/ethindexer.log.

By default, Indexer connects to parity Ethereum node. Check these lines for correct path to ipc before you start the service. You can also connect to other Ethereum node like geth.

# Connect to geth node
#web3 = Web3(Web3.IPCProvider("/home/geth/.ethereum/geth.ipc"))

# Or connect to parity node
web3 = Web3(Web3.IPCProvider("/home/parity/.local/share/io.parity.ethereum/jsonrpc.ipc"))

Indexer can fetch transactions not from the beginnig, but from special block number. It will speed up indexing process and reduce database size. If you want to indicate starting Ethereum block number, set it instead of default 46146 value.

    if maxblockindb is None:
        maxblockindb = 46146

For a reference, index size starting from 5,555,555 block to 9,000,000 is about 190 GB.

First Indexer will store transactions starting from block you set. It will take a time. After that, it will check for new blocks every 20 seconds and update the index. If you want to change the interval, change the line:

    time.sleep(20)

Ethereum Indexer's API

To get Ethereum transactions by address, Postgrest is used. It provides RESTful API to Postgres index database.

After index is created, you can use requests like

curl -k -X GET "http://localhost:3000/?and=(contract_to.eq.,or(txfrom.eq.0x6b924750e56a674a2ad01fbf09c7c9012f16f094,txto.eq.0x6b924750e56a674a2ad01fbf09c7c9012f16f094))&order=time.desc&limit=25"

The request will show 25 last transactions for Ethereum address 0x6b924750e56a674a2ad01fbf09c7c9012f16f094, ordered by timestamp. For API reference, see Postgrest.

Setup

Prerequisites

• geth or parity (with currently synchronized chain)
• Python 3.6
• Postgresql 10.5
• Postgrest
• nginx (in case of public API)

Installation

Ethereum Node

Make sure your Ethereum node is installed and is fully synced. In case of parity, you can check its API and best block height with the command:

curl --data '{"method":"eth_blockNumber","params":[],"id":1,"jsonrpc":"2.0"}' -H "Content-Type: application/json" -X POST localhost:8545

Python modules

Install Python. Install python modules:

pip3 install web3
pip3 install psycopg2

PostgreSQL

Install Postgre. Create Postgres user:

createuser -s <yourusername>

<yourusername> — user who will run service.

(As example we create superuser. You can use your own grants.)

Create database for Ethereum trasaction index:

CREATE DATABASE index;

Create table using sql script create_table.sql:

psql -f create_table.sql <yourDB>

<yourDB> — target Postgres database.

Note, for case insensitive comparisons we use citex data type instead of text.

Remember to grant priveleges to database and tables for users you need.

Ethereum transaction Indexer

ethsync.py is a script which makes Ethereum transactions index to get transactions by ETH address using API. For configuration, see Details and configuration.

Run the Indexer.

python3.6 you/path/to/script/ethsync.py <yourDB>

Or use ethstorage.service to run as a deamon (recommended). You should correct the line:

ExecStart=/usr/bin/python3.6 you/path/to/script/ethsync.py <yourDB>

Put the file to /lib/systemd/system. Then register a service:

systemctl daemon-reload
systemctl start ethstorage.service

Note, indexing takes time. To check indexing process, get the last indexed block:

psql -d index -c 'SELECT MAX(block) FROM ethtxs;'

And compare to Ethereum node's best block.

Transaction API with Postgrest

Install and configure Postgrest. Here is an example to run API for user api_user connected to index database on 3000 port:

db-uri = "postgres://api_user@/index"
db-schema = "public"
db-anon-role = "api_user"
db-pool = 10
server-host = "127.0.0.1"
server-port = 3000

Make sure you add Postgrest in crontab for autostart on reboot:

@reboot cd /usr/share && /usr/bin/postgrest ./postgrest.conf

Make Indexer's API public

If you need to provide public API, use any webserver like nginx and setup proxy to Postgrest port in config:

location /ethtxs {
    proxy_pass http://127.0.0.1:3000;
}
location /aval {
    proxy_pass http://127.0.0.1:3000;
}

This way two endpoints will be available:

• /ethtxs used to fetch Ethereum transactions by address
• /aval returns status of service

Endpoint aval is a table with status field just to check API aviablity. Though it is not necessary, you can add it by creating aval table:

CREATE TABLE public.aval
(
    "status" INTEGER
)

TABLESPACE pg_default;

INSERT INTO public.aval(status) VALUES (1);

Examples

Get last 25 Ethereum transactions without ERC-20 transactions for address 0x1143e097e134f3407ef6b088672ccece9a4f8cdd:

https://ethnode1.adamant.im/ethtxs?and=(contract_to.eq.,or(txfrom.eq.0x1143e097e134f3407ef6b088672ccece9a4f8cdd,txto.eq.0x1143e097e134f3407ef6b088672ccece9a4f8cdd))&order=time.desc&limit=25

Get last 25 ERC-20 transactions without Ethereum transactions for address 0x1143e097e134f3407ef6b088672ccece9a4f8cdd:

https://ethnode1.adamant.im/ethtxs?and=(contract_to.neq.,or(txfrom.eq.0x1143e097e134f3407ef6b088672ccece9a4f8cdd,txto.eq.0x1143e097e134f3407ef6b088672ccece9a4f8cdd))&order=time.desc&limit=25

Get last 25 transactions for both ERC-20 and Ethereum for address 0x1143e097e134f3407ef6b088672ccece9a4f8cdd:

https://ethnode1.adamant.im/ethtxs?and=(or(txfrom.eq.0x1143e097e134f3407ef6b088672ccece9a4f8cdd,txto.eq.0x1143e097e134f3407ef6b088672ccece9a4f8cdd))&order=time.desc&limit=25

Zabbix API aviability trigger example:

{API for Ethereum transactions:system.run["curl -s https://ethnode1.adamant.im/aval | jq .[].status"].last()}<>1

License

Copyright © 2017-2019 ADAMANT TECH LABS LP

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/.