389 lines
12 KiB
Markdown
389 lines
12 KiB
Markdown
# Nimbus: an Ethereum 2.0 Sharding Client for Resource-Restricted Devices
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[](https://opensource.org/licenses/Apache-2.0)
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[](https://opensource.org/licenses/MIT)
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[](https://discord.gg/XRxWahP)
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[](https://gitter.im/status-im/nimbus)
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[](https://get.status.im/chat/public/nimbus-general)
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## Rationale
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[Nimbus: an Ethereum 2.0 Sharding Client](https://our.status.im/nimbus-for-newbies/). The code in this repository is currently focusing on Ethereum 1.0 feature parity, while all 2.0 research and development is happening in parallel in [nimbus-eth2](https://github.com/status-im/nimbus-eth2).
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## Development Updates
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To keep up to date with changes and development progress, follow the [Nimbus blog](https://our.status.im/tag/nimbus/).
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## Building & Testing
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_We currently do not guarantee that Nimbus will work on Windows._
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### Prerequisites
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* [RocksDB](https://github.com/facebook/rocksdb/)
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* PCRE
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* GNU Make, Bash and the usual POSIX utilities. Git 2.9.4 or newer.
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On Windows, a precompiled DLL collection download is available through the `fetch-dlls` Makefile target: ([Windows instructions](#windows)).
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```bash
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# MacOS with Homebrew
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brew install rocksdb pcre
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# Fedora
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dnf install rocksdb-devel pcre pcre-devel
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# Debian and Ubuntu
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sudo apt-get install librocksdb-dev libpcre3-dev
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# Arch (AUR)
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pakku -S rocksdb pcre-static
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```
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`rocksdb` can also be installed by following [their instructions](https://github.com/facebook/rocksdb/blob/master/INSTALL.md).
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#### Obtaining the prerequisites through the Nix package manager
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*Experimental*
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Users of the [Nix package manager](https://nixos.org/nix/download.html) can install all prerequisites simply by running:
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``` bash
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nix-shell default.nix
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```
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### Build & Develop
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#### POSIX-compatible OS
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```bash
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# The first `make` invocation will update all Git submodules.
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# You'll run `make update` after each `git pull`, in the future, to keep those submodules up to date.
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make nimbus
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# See available command line options
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build/nimbus --help
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# Start syncing with mainnet
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build/nimbus
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# Update to latest version
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git pull
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make update
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# Run tests
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make test
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```
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To run a command that might use binaries from the Status Nim fork:
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```bash
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./env.sh bash # start a new interactive shell with the right env vars set
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which nim
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nim --version
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# or without starting a new interactive shell:
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./env.sh which nim
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./env.sh nim --version
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```
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Our Wiki provides additional helpful information for [debugging individual test cases][1]
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and for [pairing Nimbus with a locally running copy of Geth][2].
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#### Windows
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_(Experimental support!)_
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Install Mingw-w64 for your architecture using the "[MinGW-W64 Online
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Installer](https://sourceforge.net/projects/mingw-w64/files/)" (first link
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under the directory listing). Run it and select your architecture in the setup
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menu ("i686" on 32-bit, "x86\_64" on 64-bit), set the threads to "win32" and
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the exceptions to "dwarf" on 32-bit and "seh" on 64-bit. Change the
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installation directory to "C:\mingw-w64" and add it to your system PATH in "My
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Computer"/"This PC" -> Properties -> Advanced system settings -> Environment
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Variables -> Path -> Edit -> New -> C:\mingw-w64\mingw64\bin (it's "C:\mingw-w64\mingw32\bin" on 32-bit)
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Install [Git for Windows](https://gitforwindows.org/) and use a "Git Bash" shell to clone and build Nimbus.
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If you don't want to compile RocksDB and SQLite separately, you can fetch pre-compiled DLLs with:
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```bash
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mingw32-make fetch-dlls # this will place the right DLLs for your architecture in the "build/" directory
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```
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You can now follow those instructions in the previous section by replacing `make` with `mingw32-make` (regardless of your 32-bit or 64-bit architecture):
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```bash
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mingw32-make nimbus # build the Nimbus binary
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mingw32-make test # run the test suite
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# etc.
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```
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#### Raspberry PI
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*Experimental* The code can be compiled on a Raspberry PI:
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* Raspberry PI 3b+
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* 64gb SD Card (less might work too, but the default recommended 4-8GB will probably be too small)
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* [Rasbian Buster Lite](https://www.raspberrypi.org/downloads/raspbian/) - Lite version is enough to get going and will save some disk space!
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Assuming you're working with a freshly written image:
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```bash
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# Start by increasing swap size to 2gb:
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sudo vi /etc/dphys-swapfile
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# Set CONF_SWAPSIZE=2048
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# :wq
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sudo reboot
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# Install prerequisites
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sudo apt-get install git libgflags-dev libsnappy-dev
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mkdir status
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cd status
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# Install rocksdb
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git clone https://github.com/facebook/rocksdb.git
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cd rocksdb
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make shared_lib
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sudo make install
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cd..
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# Raspberry pi doesn't include /usr/local/lib in library search path - need to add
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export LD_LIBRARY_PATH=/usr/local/lib:$LD_LIBRARY_PATH
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git clone https://github.com/status-im/nimbus.git
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cd nimbus
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# Follow instructions above!
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```
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#### Android
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*Experimental* Code can be compiled and run on Android devices
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##### Environment setup
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* Install the [Termux](https://termux.com) app from FDroid or the Google Play store
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* Install a [PRoot](https://wiki.termux.com/wiki/PRoot) of your choice following the instructions for your preferred distribution.
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Note, the Ubuntu PRoot is known to contain all Nimbus prerequisites compiled on Arm64 architecture (common architecture for Android devices). Depending on the distribution, it may require effort beyond the scope of this guide to get all prerequisites.
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*Assuming Ubuntu PRoot is used*
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```bash
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# Install prerequisites
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apt install librocksdb-dev libpcre3-dev
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# Clone repo and build Nimbus just like above
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git clone https://github.com/status-im/nimbus.git
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cd nimbus
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make
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make nimbus
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build/nimbus
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```
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### <a name="make-xvars"></a>Experimental make variables
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Apart from standard make flags (see link in the next [chapter](#devel-tips)),
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the following make variables can be set to control which version of a virtual
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engine is compiled. The variables are listed with decreasing priority (in
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case of doubt, the lower prioritised variable is ignored when the higher on is
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available.)
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* ENABLE_EVMC=1<br>
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Enable mostly EVMC compliant wrapper around the native nim VM
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* ENABLE_VM2LOWMEM=1<br>
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Enable new re-factored version of the native nim VM. This version is not
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optimised and coded in a way so that low memory compilers can handle it
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(observed on 32 bit windows 7.)
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* ENABLE_VM2=1<br>
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Enable new re-factored version of the native nim VM.
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For these variables, using <variable>=0 is ignored and <variable>=2
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has the same effect as <variable>=1 (ditto for other numbers.)
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### <a name="devel-tips"></a>Development tips
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Interesting Make variables and targets are documented in the [nimbus-build-system](https://github.com/status-im/nimbus-build-system) repo.
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- you can switch the DB backend with a Nim compiler define:
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`-d:nimbus_db_backend=...` where the (case-insensitive) value is one of
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"rocksdb" (the default), "sqlite", "lmdb"
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- the Premix debugging tools are [documented separately](premix/readme.md)
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- you can control the Makefile's verbosity with the V variable (defaults to 0):
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```bash
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make V=1 # verbose
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make V=2 test # even more verbose
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```
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- same for the [Chronicles log level](https://github.com/status-im/nim-chronicles#chronicles_log_level):
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```bash
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make LOG_LEVEL=DEBUG nimbus # this is the default
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make LOG_LEVEL=TRACE nimbus # log everything
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```
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- pass arbitrary parameters to the Nim compiler:
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```bash
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make NIMFLAGS="-d:release"
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```
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- if you want to use SSH keys with GitHub (also handles submodules):
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```bash
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make github-ssh
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```
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- force a Nim compiler rebuild:
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```bash
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rm vendor/Nim/bin/nim
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make -j8 build-nim
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```
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#### Git submodule workflow
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Working on a dependency:
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```bash
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cd vendor/nim-chronicles
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git checkout -b mybranch
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# make some changes
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git status
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git commit -a
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git push origin mybranch
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# create a GitHub PR and wait for it to be approved and merged
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git checkout master
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git pull
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git branch -d mybranch
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# realise that the merge was done without "--no-ff"
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git branch -D mybranch
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# update the submodule's commit in the superproject
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cd ../..
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git status
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git add vendor/nim-chronicles
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git commit
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```
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It's important that you only update the submodule commit after it's available upstream.
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You might want to do this on a new branch of the superproject, so you can make
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a GitHub PR for it and see the CI test results.
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Don't update all Git submodules at once, just because you found the relevant
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Git command or `make` target. You risk updating submodules to other people's
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latest commits when they are not ready to be used in the superproject.
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Adding the submodule "https://github.com/status-im/foo" to "vendor/foo":
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```bash
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vendor/nimbus-build-system/scripts/add_submodule.sh status-im/foo
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# or
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./env.sh add_submodule status-im/foo
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# want to place it in "vendor/bar" instead?
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./env.sh add_submodule status-im/foo vendor/bar
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```
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Removing the submodule "vendor/bar":
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```bash
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git submodule deinit -f -- vendor/bar
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git rm -f vendor/bar
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```
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Checking out older commits, either to bisect something or to reproduce an older build:
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```bash
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git checkout <commit hash here>
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make clean
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make -j8 update
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```
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Running a dependency's test suite using `nim` instead of `nimble` (which cannot be
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convinced not to run a dependency check, thus clashing with our jury-rigged
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"vendor/.nimble/pkgs"):
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```bash
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cd vendor/nim-rocksdb
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../nimbus-build-system/scripts/nimble.sh test
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# or
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../../env.sh nimble test
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```
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### Metric visualisation
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Install Prometheus and Grafana. On Gentoo, it's `emerge prometheus grafana-bin`.
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```bash
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# build Nimbus
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make nimbus
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# the Prometheus daemon will create its data dir in the current dir, so give it its own directory
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mkdir ../my_metrics
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# copy the basic config file over there
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cp -a examples/prometheus.yml ../my_metrics/
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# start Prometheus in a separate terminal
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cd ../my_metrics
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prometheus --config.file=prometheus.yml # loads ./prometheus.yml, writes metric data to ./data
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# start a fresh Nimbus sync and export metrics
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rm -rf ~/.cache/nimbus/db; ./build/nimbus --prune:archive --metricsServer
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```
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Start the Grafana server. On Gentoo it's `/etc/init.d/grafana start`. Go to
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http://localhost:3000, log in with admin:admin and change the password.
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Add Prometheus as a data source. The default address of http://localhost:9090
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is OK, but Grafana 6.3.5 will not apply that semitransparent default you see in
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the form field, unless you click on it.
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Create a new dashboard. Click on its default title in the upper left corner
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("New Dashboard"). In the new page, click "Import dashboard" in the right
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column and upload "examples/Nimbus-Grafana-dashboard.json".
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In the main panel, there's a hidden button used to assign metrics to the left
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or right Y-axis - it's the coloured line on the left of the metric name, in the
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graph legend.
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To see a single metric, click on its name in the legend. Click it again to go back
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to the combined view. To edit a panel, click on its title and select "Edit".
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[Obligatory screenshot.](https://i.imgur.com/AdtavDA.png)
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### Troubleshooting
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Report any errors you encounter, please, if not [already documented](https://github.com/status-im/nimbus/issues)!
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* Turn it off and on again:
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```bash
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make clean
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make update
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```
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## License
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Licensed and distributed under either of
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* MIT license: [LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT
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or
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* Apache License, Version 2.0, ([LICENSE-APACHEv2](LICENSE-APACHEv2) or http://www.apache.org/licenses/LICENSE-2.0)
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at your option. These files may not be copied, modified, or distributed except according to those terms.
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[1]: https://github.com/status-im/nimbus/wiki/Understanding-and-debugging-Nimbus-EVM-JSON-tests
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[2]: https://github.com/status-im/nimbus/wiki/Debugging-state-reconstruction
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