keep-common

= `keep-common`

Common libraries and tools used across Keep repositories.

== Directory structure

The directory structure used in the `keep-common` repository is the same as
used on other Keep repositories, and very similar to that used in other Go
projects:

```
keep-common/
  Makefile <1>
  docs/
  contracts/ <2>
    docs/
    solidity/
  tools/ <3>
    generators/ <4>
  pkg/ <5>
    net/
      net.go, *.go <5>
      libp2p/
    chain/
      chain.go, *.go <5>
      ethereum/
        gen/
          gen.go <6>
    relay/
      relay.go, *.go
```
<1> The Makefile should be minimal, mirroring the Dockerfile when possible.
<2> While Keep only uses Solidity at the moment, the directory structure allows
    for other contract languages.
<3> Keep tools have categorized directories here, which are typically Go
    commands that can be used from other repositories.
<4> Code generators in particular live in this subtree.
<5> All additional Go packages live in `pkg/`.
<6> The high-level interfaces for a package `mypackage` live in `mypackage.go`.
    `net` and `chain` are interface packages that expose a common interface
    to network and blockchain layers, for example. Their subpackages provide
    particular implementations of these common interfaces, if these are
    considered shared implementations..
<7> When a package requires generated code, it should have a subpackage named
    `gen/`. This subpackage should contain a single file, `gen.go`, with a
    `// go:generate` annotation to trigger appropriate code generation. All code
    generation is done with a single invocation of `go generate` at build time.