syntax = "proto3";

package smartbotic.proto;

// Lets a running workflow switch another workflow on or off, and read its
// state, without going through the REST API.
//
// It lives on the webserver rather than in the runner because the webserver
// owns the scheduler. Writing "active" straight into the workflows collection
// would set a flag nothing acts on: registering and unregistering triggers
// happens here, and a workflow switched on by a database write would sit there
// looking enabled and never run.
//
// Served on the same port as CredentialService, and for the same reason - the
// runner already holds a channel to it, and a request says which workflow is
// asking so the webserver can decide whether to allow it.
service WorkflowControlService {
    // Switch a workflow on or off. Registers or unregisters its triggers as
    // part of the same call.
    rpc SetWorkflowActive(SetWorkflowActiveRequest) returns (SetWorkflowActiveResponse);

    // What a workflow's state is: whether it is on, and how close it is to
    // being switched off by consecutive failures.
    rpc GetWorkflowState(GetWorkflowStateRequest) returns (GetWorkflowStateResponse);
}

message SetWorkflowActiveRequest {
    string workflow_id = 1;             // the workflow to switch
    bool active = 2;
    string requesting_workflow_id = 3;  // who is asking, for access control
}

message SetWorkflowActiveResponse {
    bool success = 1;
    bool active = 2;                    // the state afterwards
    bool changed = 3;                   // false when it was already in that state
    string error = 4;
}

message GetWorkflowStateRequest {
    string workflow_id = 1;
    string requesting_workflow_id = 2;
}

message GetWorkflowStateResponse {
    bool success = 1;
    string name = 2;
    bool active = 3;
    int32 consecutive_failures = 4;
    int32 deactivate_after_failures = 5;  // 0 when the workflow never switches itself off
    string deactivated_reason = 6;        // why it switched itself off, when it did
    int64 published_version = 7;
    string error = 8;
}