// SPDX-License-Identifier: MIT

// Internal wire format between the host process of ermite-runner and the
// executor running inside a sandbox (vsock in a micro-VM, Unix socket in a
// container). Frames are length-prefixed on the stream (see frame.go); this file
// defines the payload. It is internal to ermite-runner: no compatibility is
// promised between runner versions, which is safe because the host attaches its
// own executable to every sandbox.

syntax = "proto3";

package ermite.runner.exec.v1;

option go_package = "bnema.dev/ermite-runner/internal/execstream/execpb";

// Frame is the only message on the stream.
message Frame {
  oneof body {
    Hello hello = 1;   // executor -> host, first frame
    Run run = 2;       // host -> executor, after Hello
    Output output = 3; // executor -> host
    Exit exit = 4;     // executor -> host, last frame
    Cancel cancel = 5; // host -> executor
    StepStarted step_started = 6;     // executor -> host
    StepCompleted step_completed = 7; // executor -> host
    Log log = 8;                      // executor -> host
    JobResult job_result = 9;         // executor -> host, before Exit
  }
}

message Hello {
  string version = 1;  // runner version of the executor
  string sandbox = 2;  // "vm" or "container"
  string hostname = 3;
}

// Run asks the executor to run a script or a job. Without job it is the stub
// executor of sandbox-check: the script is run with `sh -c`; an empty script
// means the built-in diagnostics script. With job the executor runs the job
// like a GitHub Actions runner and reports it with StepStarted, Log,
// StepCompleted and JobResult frames, then Exit.
message Run {
  string script = 1;
  map<string, string> env = 2;
  JobSpec job = 3;
}

// JobSpec is the job to run: the fields of the job that ermite handed to the
// host process, minus the tokens (the sandbox never sees them).
message JobSpec {
  string workflow_path = 1;
  string workflow_yaml = 2;
  string job_key = 3;
  string matrix = 4;   // JSON object
  string contexts = 5; // JSON object
  string repo = 6;     // repository name
  int32 timeout_minutes = 7;
  string runner_name = 8;
  string runner_version = 9;
  // runner_environment is the runner.environment value ("github-hosted" or "self-hosted").
  string runner_environment = 10;
  bool debug = 11; // ACTIONS_STEP_DEBUG
  // deadline_ms is what is left of the job timeout when the host sends this
  // Run, in milliseconds: the timeout counts from the moment the host received
  // the job (runner.proto: Job.timeout_minutes), not from the start of the
  // executor, and booting the sandbox takes time. 0 means "use
  // timeout_minutes from now".
  int64 deadline_ms = 12;
}

enum StreamKind {
  STREAM_KIND_UNSPECIFIED = 0;
  STREAM_KIND_STDOUT = 1;
  STREAM_KIND_STDERR = 2;
}

message Output {
  StreamKind stream = 1;
  bytes data = 2;
  int64 unix_nano = 3;
}

message Exit {
  int32 code = 1;
  string error = 2; // set when the executor failed to run the script at all
}

// Cancel asks the executor to stop the running script. The executor escalates
// like the official runner: SIGINT to the script's process group at once,
// SIGTERM 7.5 s later, SIGKILL 2.5 s after that.
message Cancel {
  // reason is for the job log and diagnostics ("cancelled by the user",
  // "job timeout", ...); it never changes the behaviour.
  string reason = 1;
  // kind tells the job executor how the job ends: cancelled, timed out, or
  // cancelled because the runner shuts down. The stub executor ignores it.
  CancelKind kind = 2;
}

enum CancelKind {
  CANCEL_KIND_UNSPECIFIED = 0; // same as USER
  CANCEL_KIND_USER = 1;
  CANCEL_KIND_TIMEOUT = 2;
  CANCEL_KIND_SHUTDOWN = 3;
}

// Steps are numbered like GitHub's log: "Set up job" is 1, the steps of the
// workflow follow, "Complete job" is last.
message StepStarted {
  int32 number = 1;
  string name = 2;
  int64 unix_nano = 3;
}

message StepCompleted {
  int32 number = 1;
  string name = 2;
  StepConclusion conclusion = 3;
  int64 unix_nano = 4;
}

enum StepConclusion {
  STEP_CONCLUSION_UNSPECIFIED = 0;
  STEP_CONCLUSION_SUCCESS = 1;
  STEP_CONCLUSION_FAILURE = 2;
  STEP_CONCLUSION_CANCELLED = 3;
  STEP_CONCLUSION_SKIPPED = 4;
  STEP_CONCLUSION_TIMED_OUT = 5; // jobs only
}

// Log is one line of the job log, without terminator, valid UTF-8. A line of
// more than 64 KiB is cut by the executor into pieces at character boundaries;
// every piece but the first has continued set (the AppendLog rule).
message Log {
  int32 step = 1;
  int64 unix_nano = 2;
  string text = 3;
  bool continued = 4;
}

// JobResult is the outcome of the job; Exit follows.
message JobResult {
  StepConclusion conclusion = 1;
  map<string, string> outputs = 2;
  string error = 3;
  bool runner_shutdown = 4;
}