feat: support enabling Helia on nodejs as a node in an ipfs-cluster

[SgtPooki]

Describe the feature you are proposing

We have received multiple requests from Helia regarding connecting to an ipfs-cluster, but this got me thinking about running Helia as a node in the cluster. I have heard that ipfs-cluster is a Kubo-specific thing. Is that correct?

Can you add support for running other IPFS implementations with ipfs-cluster? If so, can we use this issue to track that work?

Additional context

N/A

[hsanjuan]

Does Helia still expose the IPFS RPC API (so the same thing that Kubo offers?). In that case it should be possible.

[SgtPooki]

Does Helia still expose the IPFS RPC API (so the same thing that Kubo offers?).

It doesn't, and I don't think we plan to add Kubo RPC API support, but it would be possible to create a Helia module that wraps a Helia node in a lightweight server that supports some rpc commands.

What RPC endpoints does a node need to support to work with a ipfs-cluster? All of them, or only a subset?

[hsanjuan]

This is the list:

	ID(context.Context) (api.IPFSID, error)
	Pin(context.Context, api.Pin) error
	Unpin(context.Context, api.Cid) error
	PinLsCid(context.Context, api.Pin) (api.IPFSPinStatus, error)
	// PinLs returns pins in the pinset of the given types (recursive, direct...)
	PinLs(ctx context.Context, typeFilters []string, out chan<- api.IPFSPinInfo) error
	// ConnectSwarms make sure this peer's IPFS daemon is connected to
	// other peers IPFS daemons.
	ConnectSwarms(context.Context) error
	// SwarmPeers returns the IPFS daemon's swarm peers.
	SwarmPeers(context.Context) ([]peer.ID, error)
	// ConfigKey returns the value for a configuration key.
	// Subobjects are reached with keypaths as "Parent/Child/GrandChild...".
	ConfigKey(keypath string) (interface{}, error)
	// RepoStat returns the current repository size and max limit as
	// provided by "repo stat".
	RepoStat(context.Context) (api.IPFSRepoStat, error)
	// RepoGC performs garbage collection sweep on the IPFS repo.
	RepoGC(context.Context) (api.RepoGC, error)
	// Resolve returns a cid given a path.
	Resolve(context.Context, string) (api.Cid, error)
	// BlockStream adds a stream of blocks to IPFS.
	BlockStream(context.Context, <-chan api.NodeWithMeta) error
	// BlockGet retrieves the raw data of an IPFS block.
	BlockGet(context.Context, api.Cid) ([]byte, error)

The ConfigKey one is probably unused.