ironflow_engine/context.rs
1//! [`WorkflowContext`] — execution context for dynamic workflows.
2//!
3//! Provides step execution methods that automatically persist results to the
4//! store. Each call to [`shell`](WorkflowContext::shell),
5//! [`http`](WorkflowContext::http), [`agent`](WorkflowContext::agent), or
6//! [`workflow`](WorkflowContext::workflow) creates a step record, executes the
7//! operation, captures the output, and returns a
8//! [`StepOutput`](crate::executor::StepOutput) that the next step can
9//! reference.
10//!
11//! # Examples
12//!
13//! ```no_run
14//! use ironflow_engine::context::WorkflowContext;
15//! use ironflow_engine::config::{ShellConfig, AgentStepConfig};
16//! use ironflow_engine::error::EngineError;
17//!
18//! # async fn example(ctx: &mut WorkflowContext) -> Result<(), EngineError> {
19//! let build = ctx.shell("build", ShellConfig::new("cargo build")).await?;
20//! let review = ctx.agent("review", AgentStepConfig::new(
21//! &format!("Build output:\n{}", build.stdout())
22//! )).await?;
23//! # Ok(())
24//! # }
25//! ```
26
27mod accessors;
28mod artifacts;
29mod error_handlers;
30mod failure;
31mod guard;
32mod lifecycle;
33mod steps;
34
35#[cfg(test)]
36mod tests;
37
38pub(crate) use lifecycle::interrupt_running_steps;
39
40use std::collections::HashMap;
41use std::fmt;
42use std::sync::Arc;
43
44use chrono::{DateTime, Utc};
45use rust_decimal::Decimal;
46use serde_json::Value;
47use uuid::Uuid;
48
49use ironflow_core::decision::DecisionProvider;
50use ironflow_core::provider::AgentProvider;
51use ironflow_core::trace_context::WorkflowTraceContext;
52use ironflow_store::models::Step;
53use ironflow_store::store::Store;
54
55use crate::artifact::ArtifactSink;
56use crate::config::StepConfig;
57use crate::executor::{StepInterceptor, StepResult};
58use crate::guard::{SharedGuardState, WorkflowGuardConfig};
59use crate::handler::WorkflowHandler;
60use crate::log_sender::LogSender;
61use crate::notify::WorkflowEventBus;
62use crate::operation::OperationContext;
63use crate::plan::SharedPlanRecorder;
64
65/// Label set on every child run of a sub-workflow step, holding the id of the
66/// run that started it. Defined by the store, which follows it to list the
67/// descendants of a run; re-exported here where workflow code looks for it.
68///
69/// The root of the chain is recorded under
70/// [`LABEL_ROOT_RUN_ID`](ironflow_core::provider::LABEL_ROOT_RUN_ID).
71///
72/// # Examples
73///
74/// ```no_run
75/// use std::collections::HashMap;
76/// use ironflow_engine::context::PARENT_RUN_ID_LABEL;
77/// use ironflow_store::models::RunFilter;
78/// use uuid::Uuid;
79///
80/// # fn example(parent: Uuid) {
81/// let children = RunFilter {
82/// labels: Some(HashMap::from([(PARENT_RUN_ID_LABEL.to_string(), parent.to_string())])),
83/// ..RunFilter::default()
84/// };
85/// # }
86/// ```
87pub use ironflow_store::entities::PARENT_RUN_ID_LABEL;
88
89/// Callback type for resolving workflow handlers by name.
90pub(crate) type HandlerResolver =
91 Arc<dyn Fn(&str) -> Option<Arc<dyn WorkflowHandler>> + Send + Sync>;
92
93/// Execution context for a single workflow run.
94///
95/// Tracks the current step position and provides convenience methods
96/// for executing operations with automatic persistence.
97///
98/// # Examples
99///
100/// ```no_run
101/// use ironflow_engine::context::WorkflowContext;
102/// use ironflow_engine::config::ShellConfig;
103/// use ironflow_engine::error::EngineError;
104///
105/// # async fn example(ctx: &mut WorkflowContext) -> Result<(), EngineError> {
106/// let result = ctx.shell("greet", ShellConfig::new("echo hello")).await?;
107/// assert!(result.stdout().contains("hello"));
108/// # Ok(())
109/// # }
110/// ```
111pub struct WorkflowContext {
112 run_id: Uuid,
113 /// The top-level run: `run_id` itself, or the parent's root for a
114 /// sub-workflow. Stamped on agent pods so a retry releases the children.
115 root_run_id: Uuid,
116 workflow_name: String,
117 store: Arc<dyn Store>,
118 provider: Arc<dyn AgentProvider>,
119 /// Optional decision backend (System One / Jev) for `ctx.decision(...)`.
120 /// `None` when no decision provider was wired: a decision step then fails
121 /// explicitly instead of silently doing nothing.
122 decision_provider: Option<Arc<dyn DecisionProvider>>,
123 handler_resolver: Option<HandlerResolver>,
124 position: u32,
125 /// IDs of the last executed step(s) -- used to record DAG dependencies.
126 last_step_ids: Vec<Uuid>,
127 /// Accumulated cost across all steps in this run.
128 total_cost_usd: Decimal,
129 /// Accumulated duration across all steps.
130 total_duration_ms: u64,
131 /// Cumulative cost cap for this run, resolved at creation. `None` = no cap.
132 max_cost_usd: Option<Decimal>,
133 /// Cost already spent by ancestor runs when this context belongs to a
134 /// sub-workflow. Zero for a top-level run.
135 inherited_cost_usd: Decimal,
136 /// Steps from a previous execution of the *same* attempt, keyed by position.
137 /// Used when resuming after approval to replay completed steps.
138 replay_steps: HashMap<u32, Step>,
139 /// All steps of a previous execution of the *same* attempt, keyed by
140 /// `(position, step name)`. A `parallel` wave shares one position across
141 /// several steps, which `replay_steps` cannot represent -- this index lets
142 /// `parallel()` check that every step of a wave already completed before
143 /// replaying the whole wave from the store, without re-running any item.
144 replay_wave_steps: HashMap<(u32, String), Step>,
145 /// Approvals granted in an *earlier* attempt, keyed by position, holding the
146 /// attempt that granted them. An approval is carried by the run, not by the
147 /// attempt, so a retry never asks a human to approve the same gate twice.
148 granted_approvals: HashMap<u32, u32>,
149 /// Human inputs answered in an *earlier* attempt, keyed by position:
150 /// (attempt, answer). Like an approval, an answer is carried by the run, so
151 /// a retry never asks a human to answer the same input twice.
152 answered_inputs: HashMap<u32, (u32, Value)>,
153 /// `Workflow` steps of the current attempt interrupted by a lost worker
154 /// lease, keyed by position. The step executed again at that position
155 /// re-enters the child run they recorded instead of starting a new one.
156 interrupted_children: HashMap<u32, Step>,
157 /// Which run attempt this context is executing (1-based).
158 attempt: u32,
159 /// Wall-clock duration already recorded on the run by previous attempts.
160 /// Added to this attempt's duration when the run is finalized.
161 carried_duration_ms: u64,
162 /// Optional sender for real-time log streaming.
163 log_sender: Option<LogSender>,
164 /// Where artifact bytes are read and written. `None` when no artifact
165 /// storage is configured: steps that declare artifacts then fail explicitly
166 /// instead of silently dropping their files.
167 artifact_sink: Option<Arc<dyn ArtifactSink>>,
168 /// Set to `true` when at least one `allow_failure` step failed.
169 has_allowed_failure: bool,
170 /// Error handlers registered via [`on_error`](Self::on_error).
171 error_handlers: Vec<OnErrorHandler>,
172 /// Shared guard state for workflow execution limits.
173 guard_state: Option<SharedGuardState>,
174 /// Guard configuration for this workflow run.
175 guard_config: Option<WorkflowGuardConfig>,
176 /// Accumulated step results for post-execution inspection.
177 step_results: Vec<StepResult>,
178 /// Optional event bus for per-run real-time monitoring.
179 event_bus: Option<WorkflowEventBus>,
180 /// Optional hook that resolves steps without executing them. `None` in
181 /// production; set by [`crate::testing::TestEngine`].
182 interceptor: Option<Arc<dyn StepInterceptor>>,
183 /// W3C trace context for distributed tracing propagation.
184 trace_context: WorkflowTraceContext,
185 /// Shared operation context for custom operations.
186 operation_ctx: Option<OperationContext>,
187 /// When the run was created, set by the engine. Bounds the signals a wait
188 /// step accepts: a signal received before the run existed is not for it.
189 /// `None` falls back to reading the run from the store.
190 run_created_at: Option<DateTime<Utc>>,
191 /// Set when the context is recording an execution plan instead of running.
192 /// Every step method checks this first and records intent without executing.
193 plan: Option<SharedPlanRecorder>,
194 /// Output set by the handler with [`set_output`](Self::set_output),
195 /// persisted on the run when the execution ends.
196 output: Option<Value>,
197 /// Worker tags carried by the process running this context, set by the
198 /// engine of a tagged worker. A sub-workflow requiring a tag missing from
199 /// this list is refused. `None` outside a worker: no check.
200 worker_tags: Option<Arc<Vec<String>>>,
201}
202
203/// A registered error handler that fires when a subsequent step fails.
204struct OnErrorHandler {
205 name: String,
206 config: StepConfig,
207}
208
209impl fmt::Debug for WorkflowContext {
210 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
211 f.debug_struct("WorkflowContext")
212 .field("run_id", &self.run_id)
213 .field("position", &self.position)
214 .field("total_cost_usd", &self.total_cost_usd)
215 .field("inherited_cost_usd", &self.inherited_cost_usd)
216 .field("max_cost_usd", &self.max_cost_usd)
217 .field("planning", &self.plan.is_some())
218 .finish_non_exhaustive()
219 }
220}