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README Update
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# ETHEREUMJS CLIENT - PROJECT SUMMARY

NOTE:
**This document is OUTDATED** and will be rewritten at some point in time. For the moment please refer to our communication channels on information on the state of client development.

The EthereumJS Team, 2020-06-01

---

## MAIN FOCUS

Main goal of this project is to develop an Ethereum main net light client as well
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[![JavaScript Style Guide](https://img.shields.io/badge/code_style-standard-brightgreen.svg)](https://standardjs.com)
[![Gitter](https://img.shields.io/gitter/room/ethereum/ethereumjs.svg?style=flat-square)](https://gitter.im/ethereum/ethereumjs)

This is the work repository for the EthereumJS main chain client implementation project.
This is a community project. See [Development Stages](./PROJECT.md#development-stages) for idea
about the current project status, [issues](https://github.com/ethereumjs/ethereumjs-client/issues)
for open issues and a project layout and read through [Community Project](./PROJECT.md#community-project)
if you want to join.
This is the work repository for the EthereumJS client project targetting both Node.js and the browser as a platform.

See [Technical Guidelines](#technical-guidelines) if
you directly want to dive into development info.

Current development stage: ``CONCEPT ANALYSIS / EARLY DEVELOPMENT``
Current development stage: ``EARLY DEVELOPMENT``

# PROJECT SUMMARY

For a summary of the project focus, some outline of a roadmap and information on the
team and how to contribute/join see [this document](./PROJECT.md).
Project summary from [this document](./PROJECT.md) is currently outdated. Please refer to our communication channels for some information on the current state of client development.

# TECHNICAL GUIDELINES

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DEBUG=devp2p:rlpx,devp2p:eth,-babel [CLIENT_START_COMMAND]
```

**Example 1: Light sync**
## API

[API Reference](./docs/API.md)

See also this [diagram](./client_diagram.png) with an overview of the client structure together with the initialization and message flow.

## EXAMPLES

### Example 1: Light sync

In this example, we will run two ethereumjs-clients. The first will be a fast sync client that
will connect to the rinkeby network and start downloading the blockchain. The second will be a
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Notice that we have to run the second client on port 50506 using the ``multiaddrs=/ip4/0.0.0.0/tcp/50506`` libp2p option to avoid port conflicts.

**Example 2: Light sync from within a browser**
### Example 2: Light sync from within a browser

In this example, we will again perform a light sync by connecting to the first client from above. However, this time we will connect directly to the first client from within a browser window using libp2p websockets.

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That's it! Now, you should start seeing headers being downloaded to the local storage of your browser. Since IndexDB is being used, even if you close and re-open the browser window, the headers you'll already downloaded will be saved.

## API

[API Reference](./docs/API.md)

## Environment / Ecosystem

**EthereumJS Ecosystem**

This project will be embedded in the EthereumJS ecosystem and many submodules already exist and
can be used within the project, have a look e.g. at [ethereumjs-block](https://github.com/ethereumjs/ethereumjs-block), [ethereumjs-vm](https://github.com/ethereumjs/ethereumjs-vm), the
[merkle-patricia-tree](https://github.com/ethereumjs/merkle-patricia-tree) or the
[ethereumjs-devp2p](https://github.com/ethereumjs/ethereumjs-devp2p) implementation.

To play well together within a client context, many sub module libraries need enhancements,
e.g. to create a common logging context. There are also larger building blocks still
missing, e.g. the [Node Discovery V5](https://github.com/ethereumjs/ethereumjs-devp2p/issues/19)
p2p implementation being necessary for a proper working light client sync. Due to the distributed
nature of EthereumJS there will be internal (to be done in this repo) and external issues
(to be done in other EthereumJS repos) to be worked on.

All (hopefully :-)) issues referring to the client implementation will be provided with a
``ethereumjs-client`` label which should be discoverable with a label search on GitHub:

- [Show external issues](https://github.com/search?utf8=%E2%9C%93&q=org%3Aethereumjs+label%3Aethereumjs-client&type=Issues&ref=advsearch&l=&l=)

**Basic Environment**

For library development the following basic environment is targeted. Some base requirements
like the testing tool arise from the need of maintaining a somewhat unified EthereumJS environment
where developers can switch between with some ease without the need to learn (too much) new
tooling.

- ``Node.js``
- ``Javascript`` (ES6)
- [Tape](https://github.com/substack/tape) for testing
- [Istanbul/nyc](https://istanbul.js.org/) for test coverage
- [standard.js](https://standardjs.com/) for linting/code formatting

## Design

**Goals**
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- ``Node`` [**In Progress**] Represents the top-level ethereum node, and is responsible for managing the lifecycle of included services.
- ``RPCManager`` [**In Progress**] Implements an embedded JSON-RPC server to handle incoming RPC requests.

## Contribution Guidelines
**Communication** This is distributed team effort. If you plan to take on larger issues
always pre-announce your work intention on the issue page and drop a short note on what
you are planning to do. If there is no issue for the stuff you want to work on create one
and describe the problem and outline the intended implementation before start working.

**Branch Structure**
## Environment / Ecosystem

Development will take place via feature branches being merged against a protected ``master``
branch. Always develop on branch also when being on your own fork, use meaningful branch
names like ``new-debug-cl-option`` or ``fixed-this-really-annoying-bug``.
**EthereumJS Ecosystem**

**Testing**
This project will be embedded in the EthereumJS ecosystem and many submodules already exist and
can be used within the project, have a look e.g. at [ethereumjs-block](https://github.com/ethereumjs/ethereumjs-block), [ethereumjs-vm](https://github.com/ethereumjs/ethereumjs-vm), the
[merkle-patricia-tree](https://github.com/ethereumjs/merkle-patricia-tree) or the
[ethereumjs-devp2p](https://github.com/ethereumjs/ethereumjs-devp2p) implementation. Work needs to be done both within this repos and related libraries.

No meaningful new PR will be accepted without associated tests (exceptions might be done on
a case-by-case basis). Test coverage should not increase (significantly) by a new PR.
You might also want to consider writing your tests first and then directly push them,
since this would be a good starting point for discussing the scope/implementation of a feature.
Related issues are labelled with the ``ethereumjs-client`` label, see [here](https://github.com/search?utf8=%E2%9C%93&q=org%3Aethereumjs+label%3Aethereumjs-client&type=Issues&ref=advsearch&l=&l=) for an org-wide search.

## EthereumJS

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