forge_core/workflow/
context.rs

1use std::collections::HashMap;
2use std::future::Future;
3use std::pin::Pin;
4use std::sync::{Arc, RwLock};
5use std::time::Duration;
6
7use chrono::{DateTime, Utc};
8use serde::de::DeserializeOwned;
9use tokio::sync::mpsc;
10use uuid::Uuid;
11
12use super::parallel::ParallelBuilder;
13use super::step::StepStatus;
14use super::suspend::{SuspendReason, WorkflowEvent};
15use crate::env::{EnvAccess, EnvProvider, RealEnvProvider};
16use crate::function::AuthContext;
17use crate::{ForgeError, Result};
18
19/// Type alias for compensation handler function.
20pub type CompensationHandler = Arc<
21    dyn Fn(serde_json::Value) -> Pin<Box<dyn Future<Output = Result<()>> + Send>> + Send + Sync,
22>;
23
24/// Step state stored during execution.
25#[derive(Debug, Clone)]
26pub struct StepState {
27    /// Step name.
28    pub name: String,
29    /// Step status.
30    pub status: StepStatus,
31    /// Serialized result (if completed).
32    pub result: Option<serde_json::Value>,
33    /// Error message (if failed).
34    pub error: Option<String>,
35    /// When the step started.
36    pub started_at: Option<DateTime<Utc>>,
37    /// When the step completed.
38    pub completed_at: Option<DateTime<Utc>>,
39}
40
41impl StepState {
42    /// Create a new pending step state.
43    pub fn new(name: impl Into<String>) -> Self {
44        Self {
45            name: name.into(),
46            status: StepStatus::Pending,
47            result: None,
48            error: None,
49            started_at: None,
50            completed_at: None,
51        }
52    }
53
54    /// Mark step as running.
55    pub fn start(&mut self) {
56        self.status = StepStatus::Running;
57        self.started_at = Some(Utc::now());
58    }
59
60    /// Mark step as completed with result.
61    pub fn complete(&mut self, result: serde_json::Value) {
62        self.status = StepStatus::Completed;
63        self.result = Some(result);
64        self.completed_at = Some(Utc::now());
65    }
66
67    /// Mark step as failed with error.
68    pub fn fail(&mut self, error: impl Into<String>) {
69        self.status = StepStatus::Failed;
70        self.error = Some(error.into());
71        self.completed_at = Some(Utc::now());
72    }
73
74    /// Mark step as compensated.
75    pub fn compensate(&mut self) {
76        self.status = StepStatus::Compensated;
77    }
78}
79
80/// Context available to workflow handlers.
81pub struct WorkflowContext {
82    /// Workflow run ID.
83    pub run_id: Uuid,
84    /// Workflow name.
85    pub workflow_name: String,
86    /// Workflow version.
87    pub version: u32,
88    /// When the workflow started.
89    pub started_at: DateTime<Utc>,
90    /// Deterministic workflow time (consistent across replays).
91    workflow_time: DateTime<Utc>,
92    /// Authentication context.
93    pub auth: AuthContext,
94    /// Database pool.
95    db_pool: sqlx::PgPool,
96    /// HTTP client.
97    http_client: reqwest::Client,
98    /// Step states (for resumption).
99    step_states: Arc<RwLock<HashMap<String, StepState>>>,
100    /// Completed steps in order (for compensation).
101    completed_steps: Arc<RwLock<Vec<String>>>,
102    /// Compensation handlers for completed steps.
103    compensation_handlers: Arc<RwLock<HashMap<String, CompensationHandler>>>,
104    /// Channel for signaling suspension (sent by workflow, received by executor).
105    suspend_tx: Option<mpsc::Sender<SuspendReason>>,
106    /// Whether this is a resumed execution.
107    is_resumed: bool,
108    /// Whether this execution resumed specifically from a sleep (timer expired).
109    resumed_from_sleep: bool,
110    /// Tenant ID for multi-tenancy.
111    tenant_id: Option<Uuid>,
112    /// Environment variable provider.
113    env_provider: Arc<dyn EnvProvider>,
114}
115
116impl WorkflowContext {
117    /// Create a new workflow context.
118    pub fn new(
119        run_id: Uuid,
120        workflow_name: String,
121        version: u32,
122        db_pool: sqlx::PgPool,
123        http_client: reqwest::Client,
124    ) -> Self {
125        let now = Utc::now();
126        Self {
127            run_id,
128            workflow_name,
129            version,
130            started_at: now,
131            workflow_time: now,
132            auth: AuthContext::unauthenticated(),
133            db_pool,
134            http_client,
135            step_states: Arc::new(RwLock::new(HashMap::new())),
136            completed_steps: Arc::new(RwLock::new(Vec::new())),
137            compensation_handlers: Arc::new(RwLock::new(HashMap::new())),
138            suspend_tx: None,
139            is_resumed: false,
140            resumed_from_sleep: false,
141            tenant_id: None,
142            env_provider: Arc::new(RealEnvProvider::new()),
143        }
144    }
145
146    /// Create a resumed workflow context.
147    pub fn resumed(
148        run_id: Uuid,
149        workflow_name: String,
150        version: u32,
151        started_at: DateTime<Utc>,
152        db_pool: sqlx::PgPool,
153        http_client: reqwest::Client,
154    ) -> Self {
155        Self {
156            run_id,
157            workflow_name,
158            version,
159            started_at,
160            workflow_time: started_at,
161            auth: AuthContext::unauthenticated(),
162            db_pool,
163            http_client,
164            step_states: Arc::new(RwLock::new(HashMap::new())),
165            completed_steps: Arc::new(RwLock::new(Vec::new())),
166            compensation_handlers: Arc::new(RwLock::new(HashMap::new())),
167            suspend_tx: None,
168            is_resumed: true,
169            resumed_from_sleep: false,
170            tenant_id: None,
171            env_provider: Arc::new(RealEnvProvider::new()),
172        }
173    }
174
175    /// Set environment provider.
176    pub fn with_env_provider(mut self, provider: Arc<dyn EnvProvider>) -> Self {
177        self.env_provider = provider;
178        self
179    }
180
181    /// Mark that this context resumed from a sleep (timer expired).
182    pub fn with_resumed_from_sleep(mut self) -> Self {
183        self.resumed_from_sleep = true;
184        self
185    }
186
187    /// Set the suspend channel.
188    pub fn with_suspend_channel(mut self, tx: mpsc::Sender<SuspendReason>) -> Self {
189        self.suspend_tx = Some(tx);
190        self
191    }
192
193    /// Set the tenant ID.
194    pub fn with_tenant(mut self, tenant_id: Uuid) -> Self {
195        self.tenant_id = Some(tenant_id);
196        self
197    }
198
199    pub fn tenant_id(&self) -> Option<Uuid> {
200        self.tenant_id
201    }
202
203    pub fn is_resumed(&self) -> bool {
204        self.is_resumed
205    }
206
207    pub fn workflow_time(&self) -> DateTime<Utc> {
208        self.workflow_time
209    }
210
211    pub fn db(&self) -> &sqlx::PgPool {
212        &self.db_pool
213    }
214
215    /// Returns a `DbConn` wrapping the pool for shared helper functions.
216    pub fn db_conn(&self) -> crate::function::DbConn<'_> {
217        crate::function::DbConn::Pool(&self.db_pool)
218    }
219
220    pub fn http(&self) -> &reqwest::Client {
221        &self.http_client
222    }
223
224    /// Set authentication context.
225    pub fn with_auth(mut self, auth: AuthContext) -> Self {
226        self.auth = auth;
227        self
228    }
229
230    /// Restore step states from persisted data.
231    pub fn with_step_states(self, states: HashMap<String, StepState>) -> Self {
232        let completed: Vec<String> = states
233            .iter()
234            .filter(|(_, s)| s.status == StepStatus::Completed)
235            .map(|(name, _)| name.clone())
236            .collect();
237
238        *self.step_states.write().expect("workflow lock poisoned") = states;
239        *self
240            .completed_steps
241            .write()
242            .expect("workflow lock poisoned") = completed;
243        self
244    }
245
246    pub fn get_step_state(&self, name: &str) -> Option<StepState> {
247        self.step_states
248            .read()
249            .expect("workflow lock poisoned")
250            .get(name)
251            .cloned()
252    }
253
254    pub fn is_step_completed(&self, name: &str) -> bool {
255        self.step_states
256            .read()
257            .expect("workflow lock poisoned")
258            .get(name)
259            .map(|s| s.status == StepStatus::Completed)
260            .unwrap_or(false)
261    }
262
263    /// Check if a step has been started (running, completed, or failed).
264    ///
265    /// Use this to guard steps that should only execute once, even across
266    /// workflow suspension and resumption.
267    pub fn is_step_started(&self, name: &str) -> bool {
268        self.step_states
269            .read()
270            .expect("workflow lock poisoned")
271            .get(name)
272            .map(|s| s.status != StepStatus::Pending)
273            .unwrap_or(false)
274    }
275
276    pub fn get_step_result<T: serde::de::DeserializeOwned>(&self, name: &str) -> Option<T> {
277        self.step_states
278            .read()
279            .expect("workflow lock poisoned")
280            .get(name)
281            .and_then(|s| s.result.as_ref())
282            .and_then(|v| serde_json::from_value(v.clone()).ok())
283    }
284
285    /// Record step start.
286    ///
287    /// If the step is already running or beyond (completed/failed), this is a no-op.
288    /// This prevents race conditions when resuming workflows.
289    pub fn record_step_start(&self, name: &str) {
290        let mut states = self.step_states.write().expect("workflow lock poisoned");
291        let state = states
292            .entry(name.to_string())
293            .or_insert_with(|| StepState::new(name));
294
295        // Only update if step is pending - prevents race condition on resume
296        // where background DB update could overwrite a completed status
297        if state.status != StepStatus::Pending {
298            return;
299        }
300
301        state.start();
302        let state_clone = state.clone();
303        drop(states);
304
305        // Persist to database in background
306        let pool = self.db_pool.clone();
307        let run_id = self.run_id;
308        let step_name = name.to_string();
309        tokio::spawn(async move {
310            let step_id = Uuid::new_v4();
311            if let Err(e) = sqlx::query(
312                r#"
313                INSERT INTO forge_workflow_steps (id, workflow_run_id, step_name, status, started_at)
314                VALUES ($1, $2, $3, $4, $5)
315                ON CONFLICT (workflow_run_id, step_name) DO NOTHING
316                "#,
317            )
318            .bind(step_id)
319            .bind(run_id)
320            .bind(&step_name)
321            .bind(state_clone.status.as_str())
322            .bind(state_clone.started_at)
323            .execute(&pool)
324            .await
325            {
326                tracing::warn!(
327                    workflow_run_id = %run_id,
328                    step = %step_name,
329                    "Failed to persist step start: {}",
330                    e
331                );
332            }
333        });
334    }
335
336    /// Record step completion (fire-and-forget database update).
337    /// Use `record_step_complete_async` if you need to ensure persistence before continuing.
338    pub fn record_step_complete(&self, name: &str, result: serde_json::Value) {
339        let state_clone = self.update_step_state_complete(name, result);
340
341        // Persist to database in background
342        if let Some(state) = state_clone {
343            let pool = self.db_pool.clone();
344            let run_id = self.run_id;
345            let step_name = name.to_string();
346            tokio::spawn(async move {
347                Self::persist_step_complete(&pool, run_id, &step_name, &state).await;
348            });
349        }
350    }
351
352    /// Record step completion and wait for database persistence.
353    pub async fn record_step_complete_async(&self, name: &str, result: serde_json::Value) {
354        let state_clone = self.update_step_state_complete(name, result);
355
356        // Persist to database synchronously
357        if let Some(state) = state_clone {
358            Self::persist_step_complete(&self.db_pool, self.run_id, name, &state).await;
359        }
360    }
361
362    /// Update in-memory step state to completed.
363    fn update_step_state_complete(
364        &self,
365        name: &str,
366        result: serde_json::Value,
367    ) -> Option<StepState> {
368        let mut states = self.step_states.write().expect("workflow lock poisoned");
369        if let Some(state) = states.get_mut(name) {
370            state.complete(result.clone());
371        }
372        let state_clone = states.get(name).cloned();
373        drop(states);
374
375        let mut completed = self
376            .completed_steps
377            .write()
378            .expect("workflow lock poisoned");
379        if !completed.contains(&name.to_string()) {
380            completed.push(name.to_string());
381        }
382        drop(completed);
383
384        state_clone
385    }
386
387    /// Persist step completion to database.
388    async fn persist_step_complete(
389        pool: &sqlx::PgPool,
390        run_id: Uuid,
391        step_name: &str,
392        state: &StepState,
393    ) {
394        // Use UPSERT to handle race condition where persist_step_start hasn't completed yet
395        if let Err(e) = sqlx::query(
396            r#"
397            INSERT INTO forge_workflow_steps (id, workflow_run_id, step_name, status, result, started_at, completed_at)
398            VALUES (gen_random_uuid(), $1, $2, $3, $4, $5, $6)
399            ON CONFLICT (workflow_run_id, step_name) DO UPDATE
400            SET status = $3, result = $4, completed_at = $6
401            "#,
402        )
403        .bind(run_id)
404        .bind(step_name)
405        .bind(state.status.as_str())
406        .bind(&state.result)
407        .bind(state.started_at)
408        .bind(state.completed_at)
409        .execute(pool)
410        .await
411        {
412            tracing::warn!(
413                workflow_run_id = %run_id,
414                step = %step_name,
415                "Failed to persist step completion: {}",
416                e
417            );
418        }
419    }
420
421    /// Record step failure.
422    pub fn record_step_failure(&self, name: &str, error: impl Into<String>) {
423        let error_str = error.into();
424        let mut states = self.step_states.write().expect("workflow lock poisoned");
425        if let Some(state) = states.get_mut(name) {
426            state.fail(error_str.clone());
427        }
428        let state_clone = states.get(name).cloned();
429        drop(states);
430
431        // Persist to database in background
432        if let Some(state) = state_clone {
433            let pool = self.db_pool.clone();
434            let run_id = self.run_id;
435            let step_name = name.to_string();
436            tokio::spawn(async move {
437                if let Err(e) = sqlx::query(
438                    r#"
439                    UPDATE forge_workflow_steps
440                    SET status = $3, error = $4, completed_at = $5
441                    WHERE workflow_run_id = $1 AND step_name = $2
442                    "#,
443                )
444                .bind(run_id)
445                .bind(&step_name)
446                .bind(state.status.as_str())
447                .bind(&state.error)
448                .bind(state.completed_at)
449                .execute(&pool)
450                .await
451                {
452                    tracing::warn!(
453                        workflow_run_id = %run_id,
454                        step = %step_name,
455                        "Failed to persist step failure: {}",
456                        e
457                    );
458                }
459            });
460        }
461    }
462
463    /// Record step compensation.
464    pub fn record_step_compensated(&self, name: &str) {
465        let mut states = self.step_states.write().expect("workflow lock poisoned");
466        if let Some(state) = states.get_mut(name) {
467            state.compensate();
468        }
469        let state_clone = states.get(name).cloned();
470        drop(states);
471
472        // Persist to database in background
473        if let Some(state) = state_clone {
474            let pool = self.db_pool.clone();
475            let run_id = self.run_id;
476            let step_name = name.to_string();
477            tokio::spawn(async move {
478                if let Err(e) = sqlx::query(
479                    r#"
480                    UPDATE forge_workflow_steps
481                    SET status = $3
482                    WHERE workflow_run_id = $1 AND step_name = $2
483                    "#,
484                )
485                .bind(run_id)
486                .bind(&step_name)
487                .bind(state.status.as_str())
488                .execute(&pool)
489                .await
490                {
491                    tracing::warn!(
492                        workflow_run_id = %run_id,
493                        step = %step_name,
494                        "Failed to persist step compensation: {}",
495                        e
496                    );
497                }
498            });
499        }
500    }
501
502    pub fn completed_steps_reversed(&self) -> Vec<String> {
503        let completed = self.completed_steps.read().expect("workflow lock poisoned");
504        completed.iter().rev().cloned().collect()
505    }
506
507    pub fn all_step_states(&self) -> HashMap<String, StepState> {
508        self.step_states
509            .read()
510            .expect("workflow lock poisoned")
511            .clone()
512    }
513
514    pub fn elapsed(&self) -> chrono::Duration {
515        Utc::now() - self.started_at
516    }
517
518    /// Register a compensation handler for a step.
519    pub fn register_compensation(&self, step_name: &str, handler: CompensationHandler) {
520        let mut handlers = self
521            .compensation_handlers
522            .write()
523            .expect("workflow lock poisoned");
524        handlers.insert(step_name.to_string(), handler);
525    }
526
527    pub fn get_compensation_handler(&self, step_name: &str) -> Option<CompensationHandler> {
528        self.compensation_handlers
529            .read()
530            .expect("workflow lock poisoned")
531            .get(step_name)
532            .cloned()
533    }
534
535    pub fn has_compensation(&self, step_name: &str) -> bool {
536        self.compensation_handlers
537            .read()
538            .expect("workflow lock poisoned")
539            .contains_key(step_name)
540    }
541
542    /// Run compensation for all completed steps in reverse order.
543    /// Returns a list of (step_name, success) tuples.
544    pub async fn run_compensation(&self) -> Vec<(String, bool)> {
545        let steps = self.completed_steps_reversed();
546        let mut results = Vec::new();
547
548        for step_name in steps {
549            let handler = self.get_compensation_handler(&step_name);
550            let result = self
551                .get_step_state(&step_name)
552                .and_then(|s| s.result.clone());
553
554            if let Some(handler) = handler {
555                let step_result = result.unwrap_or(serde_json::Value::Null);
556                match handler(step_result).await {
557                    Ok(()) => {
558                        self.record_step_compensated(&step_name);
559                        results.push((step_name, true));
560                    }
561                    Err(e) => {
562                        tracing::error!(step = %step_name, error = %e, "Compensation failed");
563                        results.push((step_name, false));
564                    }
565                }
566            } else {
567                // No compensation handler, mark as compensated anyway
568                self.record_step_compensated(&step_name);
569                results.push((step_name, true));
570            }
571        }
572
573        results
574    }
575
576    pub fn compensation_handlers(&self) -> HashMap<String, CompensationHandler> {
577        self.compensation_handlers
578            .read()
579            .expect("workflow lock poisoned")
580            .clone()
581    }
582
583    /// Sleep for a duration.
584    ///
585    /// This suspends the workflow and persists the wake time to the database.
586    /// The workflow scheduler will resume the workflow when the time arrives.
587    ///
588    /// # Example
589    /// ```ignore
590    /// // Sleep for 30 days
591    /// ctx.sleep(Duration::from_secs(30 * 24 * 60 * 60)).await?;
592    /// ```
593    pub async fn sleep(&self, duration: Duration) -> Result<()> {
594        // If we resumed from a sleep, the timer already expired - continue immediately
595        if self.resumed_from_sleep {
596            return Ok(());
597        }
598
599        let wake_at = Utc::now() + chrono::Duration::from_std(duration).unwrap_or_default();
600        self.sleep_until(wake_at).await
601    }
602
603    /// Sleep until a specific time.
604    ///
605    /// If the wake time has already passed, returns immediately.
606    ///
607    /// # Example
608    /// ```ignore
609    /// use chrono::{Utc, Duration};
610    /// let renewal_date = Utc::now() + Duration::days(30);
611    /// ctx.sleep_until(renewal_date).await?;
612    /// ```
613    pub async fn sleep_until(&self, wake_at: DateTime<Utc>) -> Result<()> {
614        // If we resumed from a sleep, the timer already expired - continue immediately
615        if self.resumed_from_sleep {
616            return Ok(());
617        }
618
619        // If wake time already passed, return immediately
620        if wake_at <= Utc::now() {
621            return Ok(());
622        }
623
624        // Persist the wake time to database
625        self.set_wake_at(wake_at).await?;
626
627        // Signal suspension to executor
628        self.signal_suspend(SuspendReason::Sleep { wake_at })
629            .await?;
630
631        Ok(())
632    }
633
634    /// Wait for an external event with optional timeout.
635    ///
636    /// The workflow suspends until the event arrives or the timeout expires.
637    /// Events are correlated by the workflow run ID.
638    ///
639    /// # Example
640    /// ```ignore
641    /// let payment: PaymentConfirmation = ctx.wait_for_event(
642    ///     "payment_confirmed",
643    ///     Some(Duration::from_secs(7 * 24 * 60 * 60)), // 7 days
644    /// ).await?;
645    /// ```
646    pub async fn wait_for_event<T: DeserializeOwned>(
647        &self,
648        event_name: &str,
649        timeout: Option<Duration>,
650    ) -> Result<T> {
651        let correlation_id = self.run_id.to_string();
652
653        // Check if event already exists (race condition handling)
654        if let Some(event) = self.try_consume_event(event_name, &correlation_id).await? {
655            return serde_json::from_value(event.payload.unwrap_or_default())
656                .map_err(|e| ForgeError::Deserialization(e.to_string()));
657        }
658
659        // Calculate timeout
660        let timeout_at =
661            timeout.map(|d| Utc::now() + chrono::Duration::from_std(d).unwrap_or_default());
662
663        // Persist waiting state
664        self.set_waiting_for_event(event_name, timeout_at).await?;
665
666        // Signal suspension
667        self.signal_suspend(SuspendReason::WaitingEvent {
668            event_name: event_name.to_string(),
669            timeout: timeout_at,
670        })
671        .await?;
672
673        // After resume, try to consume the event
674        self.try_consume_event(event_name, &correlation_id)
675            .await?
676            .and_then(|e| e.payload)
677            .and_then(|p| serde_json::from_value(p).ok())
678            .ok_or_else(|| ForgeError::Timeout(format!("Event '{}' timed out", event_name)))
679    }
680
681    /// Try to consume an event from the database.
682    #[allow(clippy::type_complexity)]
683    async fn try_consume_event(
684        &self,
685        event_name: &str,
686        correlation_id: &str,
687    ) -> Result<Option<WorkflowEvent>> {
688        let result: Option<(
689            Uuid,
690            String,
691            String,
692            Option<serde_json::Value>,
693            DateTime<Utc>,
694        )> = sqlx::query_as(
695            r#"
696                UPDATE forge_workflow_events
697                SET consumed_at = NOW(), consumed_by = $3
698                WHERE id = (
699                    SELECT id FROM forge_workflow_events
700                    WHERE event_name = $1 AND correlation_id = $2 AND consumed_at IS NULL
701                    ORDER BY created_at ASC LIMIT 1
702                    FOR UPDATE SKIP LOCKED
703                )
704                RETURNING id, event_name, correlation_id, payload, created_at
705                "#,
706        )
707        .bind(event_name)
708        .bind(correlation_id)
709        .bind(self.run_id)
710        .fetch_optional(&self.db_pool)
711        .await
712        .map_err(|e| ForgeError::Database(e.to_string()))?;
713
714        Ok(result.map(
715            |(id, event_name, correlation_id, payload, created_at)| WorkflowEvent {
716                id,
717                event_name,
718                correlation_id,
719                payload,
720                created_at,
721            },
722        ))
723    }
724
725    /// Persist wake time to database.
726    async fn set_wake_at(&self, wake_at: DateTime<Utc>) -> Result<()> {
727        sqlx::query(
728            r#"
729            UPDATE forge_workflow_runs
730            SET status = 'waiting', suspended_at = NOW(), wake_at = $2
731            WHERE id = $1
732            "#,
733        )
734        .bind(self.run_id)
735        .bind(wake_at)
736        .execute(&self.db_pool)
737        .await
738        .map_err(|e| ForgeError::Database(e.to_string()))?;
739        Ok(())
740    }
741
742    /// Persist waiting for event state to database.
743    async fn set_waiting_for_event(
744        &self,
745        event_name: &str,
746        timeout_at: Option<DateTime<Utc>>,
747    ) -> Result<()> {
748        sqlx::query(
749            r#"
750            UPDATE forge_workflow_runs
751            SET status = 'waiting', suspended_at = NOW(), waiting_for_event = $2, event_timeout_at = $3
752            WHERE id = $1
753            "#,
754        )
755        .bind(self.run_id)
756        .bind(event_name)
757        .bind(timeout_at)
758        .execute(&self.db_pool)
759        .await
760        .map_err(|e| ForgeError::Database(e.to_string()))?;
761        Ok(())
762    }
763
764    /// Signal suspension to the executor.
765    async fn signal_suspend(&self, reason: SuspendReason) -> Result<()> {
766        if let Some(ref tx) = self.suspend_tx {
767            tx.send(reason)
768                .await
769                .map_err(|_| ForgeError::Internal("Failed to signal suspension".into()))?;
770        }
771        // Return a special error that the executor catches
772        Err(ForgeError::WorkflowSuspended)
773    }
774
775    /// Create a parallel builder for executing steps concurrently.
776    ///
777    /// # Example
778    /// ```ignore
779    /// let results = ctx.parallel()
780    ///     .step("fetch_user", || async { get_user(id).await })
781    ///     .step("fetch_orders", || async { get_orders(id).await })
782    ///     .step_with_compensate("charge_card",
783    ///         || async { charge_card(amount).await },
784    ///         |charge| async move { refund(charge.id).await })
785    ///     .run().await?;
786    ///
787    /// let user: User = results.get("fetch_user")?;
788    /// let orders: Vec<Order> = results.get("fetch_orders")?;
789    /// ```
790    pub fn parallel(&self) -> ParallelBuilder<'_> {
791        ParallelBuilder::new(self)
792    }
793
794    /// Create a step runner for executing a workflow step.
795    ///
796    /// This provides a fluent API for defining steps with retry, compensation,
797    /// timeout, and optional behavior.
798    ///
799    /// # Examples
800    ///
801    /// ```ignore
802    /// use std::time::Duration;
803    ///
804    /// // Simple step
805    /// let data = ctx.step("fetch_data", || async {
806    ///     Ok(fetch_from_api().await?)
807    /// }).run().await?;
808    ///
809    /// // Step with retry (3 attempts, 2 second delay)
810    /// ctx.step("send_email", || async {
811    ///     send_verification_email(&user.email).await
812    /// })
813    /// .retry(3, Duration::from_secs(2))
814    /// .run()
815    /// .await?;
816    ///
817    /// // Step with compensation (rollback on later failure)
818    /// let charge = ctx.step("charge_card", || async {
819    ///     charge_credit_card(&card).await
820    /// })
821    /// .compensate(|charge_result| async move {
822    ///     refund_charge(&charge_result.charge_id).await
823    /// })
824    /// .run()
825    /// .await?;
826    ///
827    /// // Optional step (failure won't trigger compensation)
828    /// ctx.step("notify_slack", || async {
829    ///     post_to_slack("User signed up!").await
830    /// })
831    /// .optional()
832    /// .run()
833    /// .await?;
834    ///
835    /// // Step with timeout
836    /// ctx.step("slow_operation", || async {
837    ///     process_large_file().await
838    /// })
839    /// .timeout(Duration::from_secs(60))
840    /// .run()
841    /// .await?;
842    /// ```
843    pub fn step<T, F, Fut>(&self, name: impl Into<String>, f: F) -> super::StepRunner<'_, T>
844    where
845        T: serde::Serialize + serde::de::DeserializeOwned + Clone + Send + Sync + 'static,
846        F: Fn() -> Fut + Send + Sync + 'static,
847        Fut: std::future::Future<Output = crate::Result<T>> + Send + 'static,
848    {
849        super::StepRunner::new(self, name, f)
850    }
851}
852
853impl EnvAccess for WorkflowContext {
854    fn env_provider(&self) -> &dyn EnvProvider {
855        self.env_provider.as_ref()
856    }
857}
858
859#[cfg(test)]
860#[allow(clippy::unwrap_used, clippy::indexing_slicing)]
861mod tests {
862    use super::*;
863
864    #[tokio::test]
865    async fn test_workflow_context_creation() {
866        let pool = sqlx::postgres::PgPoolOptions::new()
867            .max_connections(1)
868            .connect_lazy("postgres://localhost/nonexistent")
869            .expect("Failed to create mock pool");
870
871        let run_id = Uuid::new_v4();
872        let ctx = WorkflowContext::new(
873            run_id,
874            "test_workflow".to_string(),
875            1,
876            pool,
877            reqwest::Client::new(),
878        );
879
880        assert_eq!(ctx.run_id, run_id);
881        assert_eq!(ctx.workflow_name, "test_workflow");
882        assert_eq!(ctx.version, 1);
883    }
884
885    #[tokio::test]
886    async fn test_step_state_tracking() {
887        let pool = sqlx::postgres::PgPoolOptions::new()
888            .max_connections(1)
889            .connect_lazy("postgres://localhost/nonexistent")
890            .expect("Failed to create mock pool");
891
892        let ctx = WorkflowContext::new(
893            Uuid::new_v4(),
894            "test".to_string(),
895            1,
896            pool,
897            reqwest::Client::new(),
898        );
899
900        ctx.record_step_start("step1");
901        assert!(!ctx.is_step_completed("step1"));
902
903        ctx.record_step_complete("step1", serde_json::json!({"result": "ok"}));
904        assert!(ctx.is_step_completed("step1"));
905
906        let result: Option<serde_json::Value> = ctx.get_step_result("step1");
907        assert!(result.is_some());
908    }
909
910    #[test]
911    fn test_step_state_transitions() {
912        let mut state = StepState::new("test");
913        assert_eq!(state.status, StepStatus::Pending);
914
915        state.start();
916        assert_eq!(state.status, StepStatus::Running);
917        assert!(state.started_at.is_some());
918
919        state.complete(serde_json::json!({}));
920        assert_eq!(state.status, StepStatus::Completed);
921        assert!(state.completed_at.is_some());
922    }
923}
forge_core/workflow/context.rs

forge_core/workflow/
context.rs
