# Fluffy: The Nimbus Portal Network Client

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## Introduction
This folder holds the development of the Nimbus client implementation supporting
the Portal Network: Fluffy. The Portal Network is a project still heavily in
research phase and fully in flux. This client is thus still highly experimental.

Current status of specifications can be found in the
[portal-network-specs repository](https://github.com/ethereum/portal-network-specs/blob/master/portal-network.md).


## Development Updates

To keep up to date with changes and development progress, follow the
[Nimbus blog](https://our.status.im/tag/nimbus/).

Monthly development updates are shared
[here](https://hackmd.io/jRpxY4WBQJ-hnsKaPDYqTw).

## How to Build & Run

### Prerequisites
- GNU Make, Bash and the usual POSIX utilities. Git 2.9.4 or newer.

### Build the Fluffy client
```bash
git clone git@github.com:status-im/nimbus-eth1.git
cd nimbus-eth1
make fluffy

# See available command line options
./build/fluffy --help

# Example command: Run the client and connect to a bootstrap node.
./build/fluffy --bootstrap-node:enr:<base64 encoding of ENR>
```

### Update and rebuild the Fluffy client
```bash
# From the nimbus-eth1 repository
git pull
# To bring the git submodules up to date
make update

make fluffy
```

### Run a Fluffy client on the public testnet

There is a public [Portal testnet](https://github.com/ethereum/portal-network-specs/blob/master/testnet.md#portal-network-testnet) which contains nodes of different clients.
We run a fleet of Fluffy nodes that are part of this testnet.

Provide the `--network:testnet0` option to join this network.

```bash
# Connect to the Portal testnet and enable the JSON-RPC APIs
./build/fluffy --network:testnet0 --rpc --table-ip-limit:1024 --bucket-ip-limit:24
```

The `table-ip-limit` and `bucket-ip-limit` options are needed to allow more
nodes with the same IPs in the routing tables. The default limits are there
as security measure. It is currently needed to increase the limits for the testnet
because the fleet of Fluffy nodes runs on only 2 machines / network interfaces.


> **_Note:_** The `--network` option selects automatically a static set of
specific bootstrap nodes belonging to a "testnet". Currently `testnet0` is the
only option, which results in connecting to the
[testnet bootstrap nodes](https://github.com/ethereum/portal-network-specs/blob/master/testnet.md#bootnodes).
It should be noted that there is currently no real way to distinguish a "specific" Portal
network, and as long as the same Portal protocols are supported, nodes can
simply connect to it and no real separation can be made.

The testnet is currently storing only the first 25000 mainnet blocks. This can
be tested by using the JSON-RPC call `eth_getBlockByHash`:
```
# Get the hash of a block from your favorite block explorer, e.g.:
# 0x8dda3a641653c0454569c3b5be529f58b14d2a5b5d87956664c746ce1e367c21
# Run command to get this block:
curl -s -X POST -H 'Content-Type: application/json' -d '{"jsonrpc":"2.0","id":"1","method":"eth_getBlockByHash","params":["0x8dda3a641653c0454569c3b5be529f58b14d2a5b5d87956664c746ce1e367c21", false]}' http://localhost:8545 | jq
```

One can also use the `blockwalk` tool to walk down the blocks one by one, e.g:
```bash
make fluffy-tools

./build/blockwalk --block-hash:0xf6bfad56d1a45d1661506343dd1e511b5d7e17565b3ec293125ff0890b9709e5
```

### Run Fluffy test suite
```bash
# From the nimbus-eth1 repository
make fluffy-test
```

### Run Fluffy local testnet script
```bash
./fluffy/scripts/launch_local_testnet.sh
```

Find more details on the usage and workings of the local testnet script
[here](./docs/local_testnet.md).

### Seeding history (=block) data into the Portal network

1. Set-up access to an Ethereum JSON-RPC endpoint (e.g. local geth instance)
that can serve the data.
2. Use the `eth-data-exporter` tool to download history data through the
JSON-RPC endpoint into the format which is suitable for reading data into
Fluffy client and propagating into the network:

```bash
make fluffy-tools

./build/eth_data_exporter --initial-block:1 --end-block:10 --data-dir:"/user_data_dir/"
```

This will store blocks 1 to 10 into a json file located at
`./user_data_dir/eth-history-data.json`.

> Note: Currently only hardcoded address `ws://127.0.0.1:8546` works for the
Ethereum JSON-RPC endpoint.

3. Run Fluffy and trigger the propagation of data with the
`portal_history_propagate` JSON-RPC API call:

```bash
./build/fluffy --network:testnet0 --table-ip-limit:1024 --bucket-ip-limit:24 --log-level:info --rpc

# From another shell
curl -s -X POST -H 'Content-Type: application/json' -d '{"jsonrpc":"2.0","id":"1","method":"portal_history_propagate","params":["./user_data_dir/eth-history-data.json"]}' http://localhost:8545 | jq
```

### Windows support

Follow the steps outlined [here](../README.md#windows) to build fluffy on Windows.

## Metrics and their visualisation

To enable metrics run Fluffy with the `--metrics` flag:
```bash
./build/fluffy --metrics
```
Default the metrics are available at http://127.0.0.1:8008/metrics.

The address can be changed with the `--metrics-address` and `--metrics-port` options.

This provides only a snapshot of the current metrics. In order track the metrics over
time and to also visualise them one can use for example Prometheus and Grafana.

The steps on how to set up such system is explained in [this guide](https://nimbus.guide/metrics-pretty-pictures.html#prometheus-and-grafana).

A Fluffy specific dashboard can be found [here](./grafana/fluffy_grafana_dashboard.json).

This is the dashboard used for our Fluffy testnet fleet.
In order to use it locally, you will have to remove the
`{job="nimbus-fluffy-metrics"}` part from the `instance` and `container`
variables queries in the dashboard settings. Or they can also be changed to a
constant value.

The other option would be to remove those variables and remove their usage in
each panel query.

## For Developers

When working on this repository, you can run the `env.sh` script to run a
command with the right environment variables set. This means the vendored
Nim and Nim modules will be used, just as when you use `make`.

E.g.:

```bash
# start a new interactive shell with the right env vars set
./env.sh bash
```

More [development tips](../README.md#devel-tips)
can be found on the general nimbus-eth1 readme.

The code follows the
[Status Nim Style Guide](https://status-im.github.io/nim-style-guide/).

Detailed document showing commands to
[test client protocol interoperability](./docs/protocol_interop.md).

## License

Licensed and distributed under either of

* MIT license: [LICENSE-MIT](../LICENSE-MIT) or http://opensource.org/licenses/MIT

or

* Apache License, Version 2.0, ([LICENSE-APACHEv2](../LICENSE-APACHEv2) or http://www.apache.org/licenses/LICENSE-2.0)

at your option. These files may not be copied, modified, or distributed except according to those terms.