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 </pre><pre class="rust"><code><span class="comment">// Licensed to the Apache Software Foundation (ASF) under one
 // or more contributor license agreements.  See the NOTICE file
 // distributed with this work for additional information
 // regarding copyright ownership.  The ASF licenses this file
 // to you under the Apache License, Version 2.0 (the
 // &quot;License&quot;); you may not use this file except in compliance
 // with the License.  You may obtain a copy of the License at
 //
 //   http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing,
 // software distributed under the License is distributed on an
 // &quot;AS IS&quot; BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 // KIND, either express or implied.  See the License for the
 // specific language governing permissions and limitations
 // under the License.

 </span><span class="kw">use </span><span class="kw">crate</span>::error::SchedulerServiceError;

 <span class="kw">use </span>std::collections::{HashMap, HashSet, VecDeque};
 <span class="kw">use </span>std::convert::TryInto;
 <span class="kw">use </span>std::sync::Arc;
 <span class="kw">use </span>std::time::{Duration, SystemTime};
 <span class="attribute">#[allow(unused_imports)]
 </span><span class="kw">use </span>std::untrusted::time::SystemTimeEx;
 <span class="kw">use </span>tokio::sync::Mutex;

 <span class="kw">use </span>teaclave_proto::teaclave_common::{ExecutorCommand, ExecutorStatus};
 <span class="kw">use </span>teaclave_proto::teaclave_scheduler_service::<span class="kw-2">*</span>;
 <span class="kw">use </span>teaclave_proto::teaclave_storage_service::<span class="kw-2">*</span>;
 <span class="kw">use </span>teaclave_rpc::transport::{channel::Endpoint, Channel};
 <span class="kw">use </span>teaclave_rpc::{Request, Response};
 <span class="kw">use </span>teaclave_types::<span class="kw-2">*</span>;
 <span class="kw">use </span>uuid::Uuid;

 <span class="kw">use </span>anyhow::anyhow;
 <span class="kw">use </span>anyhow::Result;

 <span class="kw">const </span>EXECUTOR_TIMEOUT_SECS: u64 = <span class="number">30</span>;

 <span class="attribute">#[derive(Clone)]
 </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>TeaclaveSchedulerService {
     resources: Arc&lt;Mutex&lt;TeaclaveSchedulerResources&gt;&gt;,
 }

 <span class="kw">pub struct </span>TeaclaveSchedulerResources {
     storage_client: Arc&lt;Mutex&lt;TeaclaveStorageClient&lt;Channel&gt;&gt;&gt;,
     <span class="comment">// map executor_id to task_id
     </span>task_queue: VecDeque&lt;StagedTask&gt;,
     executors_tasks: HashMap&lt;Uuid, Uuid&gt;,
     executors_last_heartbeat: HashMap&lt;Uuid, SystemTime&gt;,
     executors_status: HashMap&lt;Uuid, ExecutorStatus&gt;,
     tasks_to_cancel: HashSet&lt;Uuid&gt;,
 }

 <span class="kw">pub struct </span>TeaclaveSchedulerDeamon {
     resources: Arc&lt;Mutex&lt;TeaclaveSchedulerResources&gt;&gt;,
 }

 <span class="kw">impl </span>TeaclaveSchedulerDeamon {
     <span class="kw">pub async fn </span>run(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;()&gt; {
         <span class="kw">loop </span>{
             std::thread::sleep(std::time::Duration::from_secs(<span class="number">2</span>));

             <span class="kw">let </span><span class="kw-2">mut </span>resources = <span class="self">self</span>.resources.lock().<span class="kw">await</span>;

             <span class="kw">let </span>key = StagedTask::get_queue_key().as_bytes();

             <span class="macro">log::debug!</span>(<span class="string">&quot;Pulling task/cancel queue&quot;</span>);
             <span class="kw">while let </span><span class="prelude-val">Ok</span>(canceled_task) = resources.pull_cancel_queue().<span class="kw">await </span>{
                 resources.tasks_to_cancel.insert(canceled_task.task_id);
             }

             <span class="kw">while let </span><span class="prelude-val">Ok</span>(staged_task) = resources.pull_staged_task::&lt;StagedTask&gt;(key).<span class="kw">await </span>{
                 <span class="macro">log::debug!</span>(<span class="string">&quot;deamon: Pulled staged task: {:?}&quot;</span>, staged_task);
                 resources.task_queue.push_back(staged_task);
             }

             <span class="kw">let </span>current_time = SystemTime::now();
             <span class="kw">let </span><span class="kw-2">mut </span>to_remove = Vec::new();
             <span class="kw">for </span>(executor_id, last_heartbeat) <span class="kw">in </span>resources.executors_last_heartbeat.iter() {
                 <span class="kw">if </span>current_time
                     .duration_since(<span class="kw-2">*</span>last_heartbeat)
                     .unwrap_or_else(|<span class="kw">_</span>| Duration::from_secs(EXECUTOR_TIMEOUT_SECS + <span class="number">1</span>))
                     &gt; Duration::from_secs(EXECUTOR_TIMEOUT_SECS)
                 {
                     <span class="comment">// executor lost
                     </span>to_remove.push(<span class="kw-2">*</span>executor_id);
                     <span class="macro">log::warn!</span>(<span class="string">&quot;Executor {} lost&quot;</span>, executor_id);
                 }
             }

             <span class="kw">for </span>executor_id <span class="kw">in </span>to_remove {
                 resources.executors_last_heartbeat.remove(<span class="kw-2">&amp;</span>executor_id);
                 resources.executors_status.remove(<span class="kw-2">&amp;</span>executor_id);
                 <span class="kw">if let </span><span class="prelude-val">Some</span>(task_id) = resources.executors_tasks.remove(<span class="kw-2">&amp;</span>executor_id) {
                     <span class="comment">// report task faliure
                     </span><span class="kw">let </span>ts = resources.get_task_state(<span class="kw-2">&amp;</span>task_id).<span class="kw">await</span><span class="question-mark">?</span>;
                     <span class="kw">if </span>ts.is_ended() {
                         <span class="kw">continue</span>;
                     }

                     <span class="macro">log::warn!</span>(<span class="string">&quot;Executor {} lost, canceling task {}&quot;</span>, executor_id, task_id);

                     <span class="kw">let </span><span class="kw-2">mut </span>task: Task&lt;Fail&gt; = ts.try_into()<span class="question-mark">?</span>;

                     <span class="macro">log::debug!</span>(<span class="string">&quot;Task failed because of Executor lost: Task {:?}&quot;</span>, task);
                     <span class="comment">// Only TaskStatus::Running/Staged is allowed here.
                     </span><span class="kw">let </span>result_err =
                         TaskResult::Err(TaskFailure::new(<span class="string">&quot;Runtime Error: Executor Timeout&quot;</span>));

                     <span class="comment">// Updating task result means we have finished execution
                     </span>task.update_result(result_err)<span class="question-mark">?</span>;

                     <span class="kw">let </span>ts = TaskState::from(task);
                     resources.put_into_db(<span class="kw-2">&amp;</span>ts).<span class="kw">await</span><span class="question-mark">?</span>;
                 }
             }
         }
     }
 }

 <span class="kw">impl </span>TeaclaveSchedulerService {
     <span class="kw">pub fn </span>new(resources: <span class="kw-2">&amp;</span>Arc&lt;Mutex&lt;TeaclaveSchedulerResources&gt;&gt;) -&gt; <span class="self">Self </span>{
         <span class="self">Self </span>{
             resources: resources.clone(),
         }
     }
 }

 <span class="kw">impl </span>TeaclaveSchedulerDeamon {
     <span class="kw">pub fn </span>new(resources: <span class="kw-2">&amp;</span>Arc&lt;Mutex&lt;TeaclaveSchedulerResources&gt;&gt;) -&gt; <span class="self">Self </span>{
         <span class="self">Self </span>{
             resources: resources.clone(),
         }
     }
 }

 <span class="kw">impl </span>TeaclaveSchedulerResources {
     <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">async fn </span>new(storage_service_endpoint: Endpoint) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>&gt; {
         <span class="kw">let </span>channel = storage_service_endpoint
             .connect()
             .<span class="kw">await
             </span>.map_err(|e| <span class="macro">anyhow!</span>(<span class="string">&quot;Failed to connect to storage service.{:?}&quot;</span>, e))<span class="question-mark">?</span>;
         <span class="kw">let </span>storage_client = Arc::new(Mutex::new(TeaclaveStorageClient::new(channel)));
         <span class="kw">let </span>task_queue = VecDeque::new();
         <span class="kw">let </span>executors_tasks = HashMap::new();
         <span class="kw">let </span>executors_status = HashMap::new();
         <span class="kw">let </span>tasks_to_cancel = HashSet::new();
         <span class="kw">let </span>executors_last_heartbeat = HashMap::new();

         <span class="kw">let </span>resources = TeaclaveSchedulerResources {
             storage_client,
             task_queue,
             executors_tasks,
             executors_last_heartbeat,
             executors_status,
             tasks_to_cancel,
         };

         <span class="prelude-val">Ok</span>(resources)
     }

     <span class="kw">async fn </span>pull_staged_task&lt;T: Storable&gt;(
         <span class="kw-2">&amp;</span><span class="self">self</span>,
         key: <span class="kw-2">&amp;</span>[u8],
     ) -&gt; std::result::Result&lt;T, SchedulerServiceError&gt; {
         <span class="kw">let </span>dequeue_request = DequeueRequest::new(key);
         <span class="kw">let </span>dequeue_response = <span class="self">self
             </span>.storage_client
             .clone()
             .lock()
             .<span class="kw">await
             </span>.dequeue(dequeue_request)
             .<span class="kw">await
             </span>.map_err(|<span class="kw">_</span>| SchedulerServiceError::StorageError)<span class="question-mark">?
             </span>.into_inner();
         T::from_slice(dequeue_response.value.as_slice()).map_err(SchedulerServiceError::Service)
     }

     <span class="kw">async fn </span>pull_cancel_queue(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; std::result::Result&lt;TaskState, SchedulerServiceError&gt; {
         <span class="kw">let </span>dequeue_request = DequeueRequest::new(CANCEL_QUEUE_KEY.as_bytes());
         <span class="kw">let </span>dequeue_response = <span class="self">self
             </span>.storage_client
             .clone()
             .lock()
             .<span class="kw">await
             </span>.dequeue(dequeue_request)
             .<span class="kw">await
             </span>.map_err(|<span class="kw">_</span>| SchedulerServiceError::StorageError)<span class="question-mark">?
             </span>.into_inner();
         TaskState::from_slice(dequeue_response.value.as_slice())
             .map_err(SchedulerServiceError::Service)
     }

     <span class="kw">async fn </span>cancel_task(<span class="kw-2">&amp;</span><span class="self">self</span>, task_id: Uuid) -&gt; std::result::Result&lt;(), SchedulerServiceError&gt; {
         <span class="kw">let </span>ts = <span class="self">self</span>.get_task_state(<span class="kw-2">&amp;</span>task_id).<span class="kw">await</span><span class="question-mark">?</span>;
         <span class="kw">let </span><span class="kw-2">mut </span>task: Task&lt;Cancel&gt; = ts.try_into()<span class="question-mark">?</span>;

         <span class="comment">// Only TaskStatus::Running/Staged is allowed here.
         </span><span class="kw">let </span>result_err = TaskResult::Err(TaskFailure::new(<span class="string">&quot;Task Canceled by the user&quot;</span>));

         task.update_result(result_err)<span class="question-mark">?</span>;

         <span class="kw">let </span>ts = TaskState::from(task);
         <span class="self">self</span>.put_into_db(<span class="kw-2">&amp;</span>ts).<span class="kw">await</span><span class="question-mark">?</span>;

         <span class="prelude-val">Ok</span>(())
     }

     <span class="kw">async fn </span>get_task_state(<span class="kw-2">&amp;</span><span class="self">self</span>, task_id: <span class="kw-2">&amp;</span>Uuid) -&gt; <span class="prelude-ty">Result</span>&lt;TaskState&gt; {
         <span class="kw">let </span>key = ExternalID::new(TaskState::key_prefix(), task_id.to_owned());
         <span class="self">self</span>.get_from_db(<span class="kw-2">&amp;</span>key).<span class="kw">await
     </span>}

     <span class="kw">async fn </span>get_from_db&lt;T: Storable&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, key: <span class="kw-2">&amp;</span>ExternalID) -&gt; <span class="prelude-ty">Result</span>&lt;T&gt; {
         <span class="macro">anyhow::ensure!</span>(T::match_prefix(<span class="kw-2">&amp;</span>key.prefix), <span class="string">&quot;Key prefix doesn&#39;t match.&quot;</span>);
         <span class="kw">let </span>get_request = GetRequest::new(key.to_bytes());
         <span class="kw">let </span>storage = <span class="self">self</span>.storage_client.clone();
         <span class="kw">let </span><span class="kw-2">mut </span>storage = storage.lock().<span class="kw">await</span>;

         <span class="kw">let </span>response = storage.get(get_request).<span class="kw">await</span><span class="question-mark">?</span>.into_inner();
         T::from_slice(response.value.as_slice())
     }

     <span class="kw">async fn </span>put_into_db(<span class="kw-2">&amp;</span><span class="self">self</span>, item: <span class="kw-2">&amp;</span><span class="kw">impl </span>Storable) -&gt; <span class="prelude-ty">Result</span>&lt;()&gt; {
         <span class="kw">let </span>k = item.key();
         <span class="kw">let </span>v = item.to_vec()<span class="question-mark">?</span>;
         <span class="kw">let </span>put_request = PutRequest::new(k.as_slice(), v.as_slice());
         <span class="kw">let </span>cli = <span class="self">self</span>.storage_client.clone();
         <span class="kw">let </span><span class="kw-2">mut </span>client = cli.lock().<span class="kw">await</span>;

         <span class="kw">let </span>_put_response = client.put(put_request).<span class="kw">await</span><span class="question-mark">?</span>;
         <span class="prelude-val">Ok</span>(())
     }
 }

 <span class="attribute">#[teaclave_rpc::async_trait]
 </span><span class="kw">impl </span>TeaclaveScheduler <span class="kw">for </span>TeaclaveSchedulerService {
     <span class="comment">// Publisher
     </span><span class="kw">async fn </span>publish_task(
         <span class="kw-2">&amp;</span><span class="self">self</span>,
         request: Request&lt;PublishTaskRequest&gt;,
     ) -&gt; TeaclaveServiceResponseResult&lt;()&gt; {
         <span class="comment">// XXX: Publisher is not implemented

         </span><span class="kw">let </span><span class="kw-2">mut </span>resources = <span class="self">self</span>.resources.lock().<span class="kw">await</span>;

         <span class="kw">let </span>staged_task =
             StagedTask::from_slice(<span class="kw-2">&amp;</span>request.get_ref().staged_task).map_err(tonic_error)<span class="question-mark">?</span>;
         resources.task_queue.push_back(staged_task);
         <span class="prelude-val">Ok</span>(Response::new(()))
     }

     <span class="comment">// Subscriber
     </span><span class="kw">async fn </span>subscribe(
         <span class="kw-2">&amp;</span><span class="self">self</span>,
         _request: Request&lt;()&gt;,
     ) -&gt; TeaclaveServiceResponseResult&lt;SubscribeResponse&gt; {
         <span class="comment">// TODO: subscribe a specific topic
         </span><span class="macro">unimplemented!</span>()
     }

     <span class="kw">async fn </span>heartbeat(
         <span class="kw-2">&amp;</span><span class="self">self</span>,
         request: Request&lt;HeartbeatRequest&gt;,
     ) -&gt; TeaclaveServiceResponseResult&lt;HeartbeatResponse&gt; {
         <span class="kw">let </span><span class="kw-2">mut </span>resources = <span class="self">self</span>.resources.lock().<span class="kw">await</span>;

         <span class="kw">let </span><span class="kw-2">mut </span>command = ExecutorCommand::NoAction;

         <span class="kw">let </span>executor_id = Uuid::parse_str(<span class="kw-2">&amp;</span>request.get_ref().executor_id).map_err(tonic_error)<span class="question-mark">?</span>;
         <span class="kw">let </span>status = request.get_ref().status.try_into().map_err(tonic_error)<span class="question-mark">?</span>;

         resources.executors_status.insert(executor_id, status);

         resources
             .executors_last_heartbeat
             .insert(executor_id, SystemTime::now());

         <span class="comment">// check if the executor need to be stopped
         </span><span class="kw">if let </span><span class="prelude-val">Some</span>(task_id) = resources.executors_tasks.get(<span class="kw-2">&amp;</span>executor_id) {
             <span class="kw">match </span>status {
                 ExecutorStatus::Executing =&gt; {
                     <span class="kw">if </span>resources.tasks_to_cancel.contains(task_id) {
                         command = ExecutorCommand::Stop;
                         <span class="kw">let </span>task_id = task_id.to_owned();
                         resources.tasks_to_cancel.remove(<span class="kw-2">&amp;</span>task_id);
                         <span class="macro">log::debug!</span>(
                             <span class="string">&quot;Sending stop command to executor {}, killing executor {} because of task cancelation&quot;</span>,
                             executor_id,
                             task_id
                         );
                         resources.cancel_task(task_id).<span class="kw">await</span>.map_err(tonic_error)<span class="question-mark">?</span>;
                         <span class="kw">return </span><span class="prelude-val">Ok</span>(Response::new(HeartbeatResponse::new(command)));
                     }
                 }
                 ExecutorStatus::Idle =&gt; {
                     resources.executors_tasks.remove(<span class="kw-2">&amp;</span>executor_id);
                 }
             }
         }

         <span class="kw">if </span>!resources.task_queue.is_empty() {
             command = ExecutorCommand::NewTask;
         }

         <span class="kw">let </span>response = HeartbeatResponse::new(command);
         <span class="prelude-val">Ok</span>(Response::new(response))
     }

     <span class="kw">async fn </span>pull_task(
         <span class="kw-2">&amp;</span><span class="self">self</span>,
         request: Request&lt;PullTaskRequest&gt;,
     ) -&gt; TeaclaveServiceResponseResult&lt;PullTaskResponse&gt; {
         <span class="kw">let </span>request = request.get_ref();
         <span class="kw">let </span><span class="kw-2">mut </span>resources = <span class="self">self</span>.resources.lock().<span class="kw">await</span>;
         <span class="kw">match </span>resources.task_queue.pop_front() {
             <span class="prelude-val">Some</span>(task) =&gt; <span class="kw">match </span>resources.tasks_to_cancel.take(<span class="kw-2">&amp;</span>task.task_id) {
                 <span class="prelude-val">Some</span>(task_id) =&gt; {
                     resources.cancel_task(task_id).<span class="kw">await</span><span class="question-mark">?</span>;
                     <span class="prelude-val">Err</span>(SchedulerServiceError::TaskCanceled.into())
                 }
                 <span class="prelude-val">None </span>=&gt; {
                     resources.executors_tasks.insert(
                         Uuid::parse_str(<span class="kw-2">&amp;</span>request.executor_id).map_err(tonic_error)<span class="question-mark">?</span>,
                         task.task_id,
                     );
                     <span class="prelude-val">Ok</span>(Response::new(PullTaskResponse::new(task)))
                 }
             },
             <span class="prelude-val">None </span>=&gt; <span class="prelude-val">Err</span>(SchedulerServiceError::TaskQueueEmpty.into()),
         }
     }

     <span class="kw">async fn </span>update_task_status(
         <span class="kw-2">&amp;</span><span class="self">self</span>,
         request: Request&lt;UpdateTaskStatusRequest&gt;,
     ) -&gt; TeaclaveServiceResponseResult&lt;()&gt; {
         <span class="kw">let </span>resources = <span class="self">self</span>.resources.lock().<span class="kw">await</span>;

         <span class="kw">let </span>task_id = Uuid::parse_str(<span class="kw-2">&amp;</span>request.get_ref().task_id).map_err(tonic_error)<span class="question-mark">?</span>;
         <span class="kw">let </span>ts = resources
             .get_task_state(<span class="kw-2">&amp;</span>task_id)
             .<span class="kw">await
             </span>.map_err(tonic_error)<span class="question-mark">?</span>;
         <span class="kw">let </span>task: Task&lt;Run&gt; = ts.try_into().map_err(tonic_error)<span class="question-mark">?</span>;

         <span class="macro">log::debug!</span>(<span class="string">&quot;UpdateTaskStatus: Task {:?}&quot;</span>, task);
         <span class="comment">// Only TaskStatus::Running is implicitly allowed here.

         </span><span class="kw">let </span>ts = TaskState::from(task);
         resources.put_into_db(<span class="kw-2">&amp;</span>ts).<span class="kw">await</span>.map_err(tonic_error)<span class="question-mark">?</span>;
         <span class="prelude-val">Ok</span>(Response::new(()))
     }

     <span class="kw">async fn </span>update_task_result(
         <span class="kw-2">&amp;</span><span class="self">self</span>,
         request: Request&lt;UpdateTaskResultRequest&gt;,
     ) -&gt; TeaclaveServiceResponseResult&lt;()&gt; {
         <span class="kw">let </span>resources = <span class="self">self</span>.resources.lock().<span class="kw">await</span>;

         <span class="kw">let </span>request = request.into_inner();
         <span class="kw">let </span>ts = resources
             .get_task_state(<span class="kw-2">&amp;</span>Uuid::parse_str(<span class="kw-2">&amp;</span>request.task_id).map_err(tonic_error)<span class="question-mark">?</span>)
             .<span class="kw">await
             </span>.map_err(tonic_error)<span class="question-mark">?</span>;
         <span class="kw">let </span><span class="kw-2">mut </span>task: Task&lt;Finish&gt; = ts.try_into().map_err(tonic_error)<span class="question-mark">?</span>;
         <span class="kw">let </span>task_result: TaskResult = request.result.try_into().map_err(tonic_error)<span class="question-mark">?</span>;
         <span class="kw">if let </span>TaskResult::Ok(outputs) = task_result.clone() {
             <span class="kw">for </span>(key, auth_tag) <span class="kw">in </span>outputs.tags_map.iter() {
                 <span class="kw">let </span>outfile = task
                     .update_output_cmac(key, auth_tag)
                     .map_err(tonic_error)<span class="question-mark">?</span>;
                 resources.put_into_db(outfile).<span class="kw">await</span>.map_err(tonic_error)<span class="question-mark">?</span>;
             }
         };

         <span class="comment">// Updating task result means we have finished execution
         </span>task.update_result(task_result).map_err(tonic_error)<span class="question-mark">?</span>;
         <span class="macro">log::debug!</span>(<span class="string">&quot;UpdateTaskResult: Task {:?}&quot;</span>, task);

         <span class="kw">let </span>ts = TaskState::from(task);
         resources.put_into_db(<span class="kw-2">&amp;</span>ts).<span class="kw">await</span>.map_err(tonic_error)<span class="question-mark">?</span>;
         <span class="prelude-val">Ok</span>(Response::new(()))
     }
 }
 </code></pre></div>
 </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="teaclave_scheduler_service_enclave" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html>