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Golang client library for lnd

lndclient is a golang native wrapper for lnd's gRPC interface.

Compatibility matrix

This library depends heavily on lnd for obvious reasons. To support backward compatibility with older versions of lnd, we use different branches for different versions. There are two "levels" of depending on a version of lnd:

  • Code level dependency: This is the version of lnd that is pulled in when compiling lndclient. It is defined in go.mod. This usually is the latest released version of lnd, because its RPC definitions are kept backward compatible. This means that a new field added in the latest version of lnd might already be available in lndclient's code, but whether or not that field will actually be set at run time is dependent on the actual version of lnd that's being connected to.
  • RPC level dependency: This is defined in minimalCompatibleVersion in lnd_services.go. When connecting to lnd, the version returned by its version service is checked and if it doesn't meet the minimal required version defined in lnd_services.go, an error will be returned. Users of lndclient can also overwrite this minimum required version when creating a new client.

The current compatibility matrix reads as follows:

lndclient git tag lnd version in go.mod minimum required lnd version
master / v0.15.4-0 v0.15.4-beta v0.15.4-beta

By default, lndclient requires (and enforces) the following RPC subservers to be active in lnd:

  • signrpc
  • walletrpc
  • chainrpc
  • invoicesrpc

Branch strategy

We follow the following strategy to maintain different versions of this library that have different lnd compatibilities:

  1. The master is always backward compatible with the last major version.
  2. We create branches for all minor versions and future major versions and merge PRs to those branches, if the features require that version to work.
  3. We rebase the branches if needed and use tags to track versions that we depend on in other projects.
  4. Once a new major version of lnd is final, all branches of minor versions lower than that are merged into master.

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