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

forge_core/workflow/
context.rs
