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| // This Source Code Form is subject to the terms of the Mozilla Public | ||
| // License, v. 2.0. If a copy of the MPL was not distributed with this | ||
| // file, You can obtain one at https://mozilla.org/MPL/2.0/. | ||
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| // instance update start saga | ||
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| // This Source Code Form is subject to the terms of the Mozilla Public | ||
| // License, v. 2.0. If a copy of the MPL was not distributed with this | ||
| // file, You can obtain one at https://mozilla.org/MPL/2.0/. | ||
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| use super::{ | ||
| ActionRegistry, NexusActionContext, NexusSaga, SagaInitError, | ||
| ACTION_GENERATE_ID, INSTANCE_LOCK_ID, | ||
| }; | ||
| use crate::app::sagas::declare_saga_actions; | ||
| use nexus_db_queries::{authn, authz}; | ||
| use serde::{Deserialize, Serialize}; | ||
| use steno::{ActionError, DagBuilder, Node}; | ||
| use uuid::Uuid; | ||
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| /// Parameters to the start instance update saga. | ||
| #[derive(Debug, Deserialize, Serialize)] | ||
| pub(crate) struct Params { | ||
| /// Authentication context to use to fetch the instance's current state from | ||
| /// the database. | ||
| pub serialized_authn: authn::saga::Serialized, | ||
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| pub authz_instance: authz::Instance, | ||
| } | ||
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| // instance update saga: actions | ||
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| declare_saga_actions! { | ||
| instance_update; | ||
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| // Acquire the instance updater" lock with this saga's ID if no other saga | ||
| // is currently updating the instance. | ||
| LOCK_INSTANCE -> "saga_instance_lock_gen" { | ||
| + siu_lock_instance | ||
| - siu_lock_instance_undo | ||
| } | ||
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| // Fetch the instance and VMM's state, and start the "real" instance update saga. | ||
| // N.B. that this must be performed as a separate action from | ||
| // `LOCK_INSTANCE`, so that if the lookup fails, we will still unwind the | ||
| // `LOCK_INSTANCE` action and release the lock. | ||
| FETCH_STATE_AND_START_REAL_SAGA -> "state" { | ||
| + siu_fetch_state_and_start_real_saga | ||
| } | ||
| } | ||
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| // instance update saga: definition | ||
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| #[derive(Debug)] | ||
| pub(crate) struct SagaInstanceUpdate; | ||
| impl NexusSaga for SagaInstanceUpdate { | ||
| const NAME: &'static str = "start-instance-update"; | ||
| type Params = Params; | ||
|
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| fn register_actions(registry: &mut ActionRegistry) { | ||
| instance_update_register_actions(registry); | ||
| } | ||
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| fn make_saga_dag( | ||
| _params: &Self::Params, | ||
| mut builder: DagBuilder, | ||
| ) -> Result<steno::Dag, SagaInitError> { | ||
| builder.append(Node::action( | ||
| INSTANCE_LOCK_ID, | ||
| "GenerateInstanceLockId", | ||
| ACTION_GENERATE_ID.as_ref(), | ||
| )); | ||
| builder.append(lock_instance_action()); | ||
| builder.append(fetch_state_and_start_real_saga_action()); | ||
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| Ok(builder.build()?) | ||
| } | ||
| } | ||
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| // start instance update saga: action implementations | ||
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| async fn siu_lock_instance( | ||
| sagactx: NexusActionContext, | ||
| ) -> Result<(), ActionError> { | ||
| let osagactx = sagactx.user_data(); | ||
| let Params { ref serialized_authn, ref authz_instance, .. } = | ||
| sagactx.saga_params::<Params>()?; | ||
| let lock_id = sagactx.lookup::<Uuid>(INSTANCE_LOCK_ID)?; | ||
| let opctx = | ||
| crate::context::op_context_for_saga_action(&sagactx, serialized_authn); | ||
| slog::info!( | ||
| osagactx.log(), | ||
| "instance update: attempting to lock instance"; | ||
| "instance_id" => %authz_instance.id(), | ||
| "saga_id" => %lock_id, | ||
| ); | ||
| osagactx | ||
| .datastore() | ||
| .instance_updater_lock(&opctx, authz_instance, &lock_id) | ||
| .await | ||
| .map_err(ActionError::action_failed) | ||
| .map(|_| ()) | ||
| } | ||
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| async fn siu_lock_instance_undo( | ||
| sagactx: NexusActionContext, | ||
| ) -> Result<(), anyhow::Error> { | ||
| let Params { ref serialized_authn, ref authz_instance, .. } = | ||
| sagactx.saga_params::<Params>()?; | ||
| super::unlock_instance_inner(serialized_authn, authz_instance, &sagactx) | ||
| .await?; | ||
| Ok(()) | ||
| } | ||
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| async fn siu_fetch_state_and_start_real_saga( | ||
| sagactx: NexusActionContext, | ||
| ) -> Result<(), ActionError> { | ||
| let osagactx = sagactx.user_data(); | ||
| let Params { serialized_authn, authz_instance, .. } = | ||
| sagactx.saga_params::<Params>()?; | ||
| let opctx = | ||
| crate::context::op_context_for_saga_action(&sagactx, &serialized_authn); | ||
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| let state = osagactx | ||
| .datastore() | ||
| .instance_fetch_with_vmms(&opctx, &authz_instance) | ||
| .await | ||
| .map_err(ActionError::action_failed)?; | ||
| osagactx | ||
| .nexus() | ||
| .execute_saga::<super::SagaDoActualInstanceUpdate>(super::RealParams { | ||
| serialized_authn, | ||
| authz_instance, | ||
| state, | ||
| }) | ||
| .await | ||
| .map_err(ActionError::action_failed)?; | ||
|
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| Ok(()) | ||
| } |