luxfi/vm

mirror of https://github.com/luxfi/vm.git synced 2026-10-30 15:13:40 +00:00

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zeekayandHanzo Dev cd50388f41 refuse an unset subprocess Log instead of dereferencing it

Log is an interface, so an unset one has no dynamic type and IsZero()
has nothing to call: the guard against a missing logger was itself the
line that dereferenced it, and it panicked on the exact input it names.
rpc.factory.New forwards the logger it is handed without looking at it,
so an unset one reaches Bootstrap rather than being caught upstream.

Reading the nil first, rather than defaulting to Noop, is what the rest
of the switch already does with a missing Stdout or Stderr: a caller
that omitted a required field is told so. Defaulting would also
contradict the check it replaces, since NoLog.IsZero() is true and is
refused here on purpose.

Co-authored-by: Hanzo Dev <[email protected]>

2026-09-02 04:27:15 -07:00

subprocess

refuse an unset subprocess Log instead of dereferencing it

2026-09-02 04:27:15 -07:00

manager.go

fix: resolve proto import paths and test compilation issues

2026-01-11 20:58:38 -08:00

README.md

docs: gRPC tag retired -> ZAP-only build per LP-200

2026-06-03 13:00:04 -07:00

runtime.go

rpc: rip LUX_ prefix from rpcchainvm handshake env vars

2026-05-15 09:53:30 -07:00

README.md

Virtual Machine Runtime Engine (VMRE)

The VMRE handles the lifecycle, compatibility and logging IO of a managed VM process.

How it works

The runtime.Initializer interface could be implemented to manage local or remote VM processes. This implementation is consumed by a ZAP-native server (LP-186) which serves the Runtime service. The server interacts with the underlying process and allows for the VM binary to communicate with Lux Node. (Historical gRPC fallback was retired in v1.26.31.)

Subprocess VM management

The subprocess is currently the only supported Runtime implementation. It works by starting the VM's as a subprocess of Lux Node by os.Exec.

Workflow

VMRegistry calls the RPC Chain VM Factory.
Factory Starts an instance of a VMRE server that consumes a runtime.Initializer interface implementation.
The address of this server is passed as a ENV variable VM_RUNTIME_ENGINE_ADDR via os.Exec which starts the VM binary.
The VM uses the address of the VMRE server to create a client.
Client sends a Initialize RPC informing the server of the Protocol Version and future Address of the RPC Chain VM server allowing it to perform a validation Handshake.
After the Handshake is complete the RPC Chain VM server is started which serves the ChainVM implementation.
The connection details for the RPC Chain VM server are now used to create an RPC Chain VM client.
ChainManager uses this VM client to bootstrap the chain powered by Linear consensus.
To shutdown the VM runtime.Stop() sends a SIGTERM signal to the VM process.

Debugging

Process Not Found

When runtime is Bootstrapped handshake success is observed during the Initialize RPC. Process not found means that the runtime Client in the VM binary could not communicate with the runtime Server on Lux Node. This could be the result of networking issues or other error in Serve().

failed to register VM {"vmID": "tGas3T58KzdjcJ2iKSyiYsWiqYctRXaPTqBCA11BqEkNg8kPc", "error": "handshake failed: timeout"}

Protocol Version Mismatch

To ensure RPC compatibility the protocol version of Lux Node must match the subnet VM. To correct this error update the subnet VM's dependencies to the latest version Lux Node.

failed to register VM {"vmID": "tGas3T58KzdjcJ2iKSyiYsWiqYctRXaPTqBCA11BqEkNg8kPc", "error": "handshake failed: protocol version mismatch node: 19 vm: 18"}