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Rosetta

Rosetta Verge

ROSETTA-VERGE IS CONSIDERED ALPHA SOFTWARE. USE AT YOUR OWN RISK! COINBASE ASSUMES NO RESPONSIBILITY NOR LIABILITY IF THERE IS A BUG IN THIS IMPLEMENTATION.

Overview

rosetta-verge provides a reference implementation of the Rosetta API for Verge in Golang. If you haven't heard of the Rosetta API, you can find more information here.

Features

  • Rosetta API implementation (both Data API and Construction API)
  • UTXO cache for all accounts (accessible using /account/balance)
  • Stateless, offline, curve-based transaction construction from any SegWit-Bech32 Address

Usage

As specified in the Rosetta API Principles, all Rosetta implementations must be deployable via Docker and support running via either an online or offline mode.

YOU MUST INSTALL DOCKER FOR THE FOLLOWING INSTRUCTIONS TO WORK. YOU CAN DOWNLOAD DOCKER HERE.

Install

Running the following commands will create a Docker image called rosetta-verge:latest.

From GitHub

To download the pre-built Docker image from the latest release, run:

curl -sSfL https://raw.githubusercontent.com/vergecurrency/rosetta-verge/master/install.sh | sh -s

Do not try to install rosetta-verge using GitHub Packages!

From Source

After cloning this repository, run:

make build-local

Run

Running the following commands will start a Docker container in detached mode with a data directory at <working directory>/verge-data and the Rosetta API accessible at port 8080.

Mainnet:Online

docker run -d --rm --ulimit "nofile=100000:100000" -v "$(pwd)/verge-data:/data" -e "MODE=ONLINE" -e "NETWORK=MAINNET" -e "PORT=8080" -p 8080:8080 -p 21102:21102 rosetta-verge:latest

If you cloned the repository, you can run make run-mainnet-online.

Mainnet:Offline

docker run -d --rm -e "MODE=OFFLINE" -e "NETWORK=MAINNET" -e "PORT=8081" -p 8081:8081 rosetta-verge:latest

If you cloned the repository, you can run make run-mainnet-offline.

Testnet:Online

docker run -d --rm --ulimit "nofile=100000:100000" -v "$(pwd)/verge-data:/data" -e "MODE=ONLINE" -e "NETWORK=TESTNET" -e "PORT=8080" -p 8080:8080 -p 21104:21104 rosetta-verge:latest

If you cloned the repository, you can run make run-testnet-online.

Testnet:Offline

docker run -d --rm -e "MODE=OFFLINE" -e "NETWORK=TESTNET" -e "PORT=8081" -p 8081:8081 rosetta-verge:latest

If you cloned the repository, you can run make run-testnet-offline.

System Requirements

rosetta-verge has been tested on an AWS c5.2xlarge instance. This instance type has 8 vCPU and 16 GB of RAM.

Network Settings

To increase the load rosetta-verge can handle, it is recommended to tune your OS settings to allow for more connections. On a linux-based OS, you can run the following commands (source):

sysctl -w net.ipv4.tcp_tw_reuse=1
sysctl -w net.core.rmem_max=16777216
sysctl -w net.core.wmem_max=16777216
sysctl -w net.ipv4.tcp_max_syn_backlog=10000
sysctl -w net.core.somaxconn=10000
sysctl -p (when done)

We have not tested rosetta-verge with net.ipv4.tcp_tw_recycle and do not recommend enabling it.

You should also modify your open file settings to 100000. This can be done on a linux-based OS with the command: ulimit -n 100000.

Memory-Mapped Files

rosetta-verge uses memory-mapped files to persist data in the indexer. As a result, you must run rosetta-verge on a 64-bit architecture (the virtual address space easily exceeds 100s of GBs).

If you receive a kernel OOM, you may need to increase the allocated size of swap space on your OS. There is a great tutorial for how to do this on Linux here.

Architecture

rosetta-verge uses the syncer, storage, parser, and server package from rosetta-sdk-go instead of a new Verge-specific implementation of packages of similar functionality. Below you can find a high-level overview of how everything fits together:

                               +------------------------------------------------------------------+
                               |                                                                  |
                               |                 +--------------------------------------+         |
                               |                 |                                      |         |
                               |                 |                 indexer              |         |
                               |                 |                                      |         |
                               |                 | +--------+                           |         |
                               +-------------------+ pruner <----------+                |         |
                               |                 | +--------+          |                |         |
                         +-----v----+            |                     |                |         |
                         | verged |            |              +------+--------+       |         |
                         +-----+----+            |     +--------> block_storage <----+  |         |
                               |                 |     |        +---------------+    |  |         |
                               |                 | +---+----+                        |  |         |
                               +-------------------> syncer |                        |  |         |
                                                 | +---+----+                        |  |         |
                                                 |     |        +--------------+     |  |         |
                                                 |     +--------> coin_storage |     |  |         |
                                                 |              +------^-------+     |  |         |
                                                 |                     |             |  |         |
                                                 +--------------------------------------+         |
                                                                       |             |            |
+-------------------------------------------------------------------------------------------+     |
|                                                                      |             |      |     |
|         +------------------------------------------------------------+             |      |     |
|         |                                                                          |      |     |
|         |                     +---------------------+-----------------------+------+      |     |
|         |                     |                     |                       |             |     |
| +-------+---------+   +-------+---------+   +-------+-------+   +-----------+----------+  |     |
| | account_service |   | network_service |   | block_service |   | construction_service +--------+
| +-----------------+   +-----------------+   +---------------+   +----------------------+  |
|                                                                                           |
|                                         server                                            |
|                                                                                           |
+-------------------------------------------------------------------------------------------+

Optimizations

  • Automatically prune verged while indexing blocks
  • Reduce sync time with concurrent block indexing
  • Use Zstandard compression to reduce the size of data stored on disk without needing to write a manual byte-level encoding

Concurrent Block Syncing

To speed up indexing, rosetta-verge uses concurrent block processing with a "wait free" design (using channels instead of sleeps to signal which threads are unblocked). This allows rosetta-verge to fetch multiple inputs from disk while it waits for inputs that appeared in recently processed blocks to save to disk.

                                                   +----------+
                                                   | verged |
                                                   +-----+----+
                                                         |
                                                         |
          +---------+ fetch block data / unpopulated txs |
          | block 1 <------------------------------------+
          +---------+                                    |
       +-->   tx 1  |                                    |
       |  +---------+                                    |
       |  |   tx 2  |                                    |
       |  +----+----+                                    |
       |       |                                         |
       |       |           +---------+                   |
       |       |           | block 2 <-------------------+
       |       |           +---------+                   |
       |       +----------->   tx 3  +--+                |
       |                   +---------+  |                |
       +------------------->   tx 4  |  |                |
       |                   +---------+  |                |
       |                                |                |
       | retrieve previously synced     |   +---------+  |
       | inputs needed for future       |   | block 3 <--+
       | blocks while waiting for       |   +---------+
       | populated blocks to save to    +--->   tx 5  |
       | disk                               +---------+
       +------------------------------------>   tx 6  |
       |                                    +---------+
       |
       |
+------+--------+
|  coin_storage |
+---------------+

Testing with rosetta-cli

To validate rosetta-verge, install rosetta-cli and run one of the following commands:

  • rosetta-cli check:data --configuration-file rosetta-cli-conf/testnet/config.json
  • rosetta-cli check:construction --configuration-file rosetta-cli-conf/testnet/config.json
  • rosetta-cli check:data --configuration-file rosetta-cli-conf/mainnet/config.json

Future Work

  • Publish benchamrks for sync speed, storage usage, and load testing
  • Rosetta API /mempool/transaction implementation
  • Add CI test using rosetta-cli to run on each PR (likely on a regtest network)
  • Add performance mode to use unlimited RAM (implementation currently optimized to use <= 16 GB of RAM)
  • Support Multi-Sig Sends

Please reach out on our community if you want to tackle anything on this list!

Development

  • make deps to install dependencies
  • make test to run tests
  • make lint to lint the source code
  • make salus to check for security concerns
  • make build-local to build a Docker image from the local context
  • make coverage-local to generate a coverage report

License

This project is available open source under the terms of the Apache 2.0 License.

© 2021 Coinbase

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