ironflow_engine/executor/
mod.rs

1//! Step executor — reconstructs operations from configs and runs them.
2//!
3//! Each step type (shell, HTTP, agent) has its own executor implementing
4//! the [`StepExecutor`] trait. The [`execute_step_config`] function dispatches
5//! to the appropriate executor based on the [`StepConfig`] variant.
6
7mod agent;
8mod http;
9mod shell;
10
11use std::future::Future;
12use std::sync::Arc;
13
14use rust_decimal::Decimal;
15use serde_json::Value;
16use uuid::Uuid;
17
18use ironflow_core::provider::AgentProvider;
19
20use crate::config::StepConfig;
21use crate::error::EngineError;
22
23pub use agent::AgentExecutor;
24pub use http::HttpExecutor;
25pub use shell::ShellExecutor;
26
27/// Result of executing a single step.
28#[derive(Debug, Clone)]
29pub struct StepOutput {
30    /// Serialized output (stdout for shell, body for http, value for agent).
31    pub output: Value,
32    /// Wall-clock duration in milliseconds.
33    pub duration_ms: u64,
34    /// Cost in USD (agent steps only).
35    pub cost_usd: Decimal,
36    /// Input token count (agent steps only).
37    pub input_tokens: Option<u64>,
38    /// Output token count (agent steps only).
39    pub output_tokens: Option<u64>,
40}
41
42/// Result of a single step within a [`parallel`](crate::context::WorkflowContext::parallel) batch.
43#[derive(Debug, Clone)]
44pub struct ParallelStepResult {
45    /// The step name (same as provided to `parallel()`).
46    pub name: String,
47    /// The step execution output.
48    pub output: StepOutput,
49    /// The step ID in the store (for dependency tracking).
50    pub step_id: Uuid,
51}
52
53/// Trait for step executors.
54///
55/// Each step type implements this trait to execute its specific operation
56/// and return a [`StepOutput`].
57pub trait StepExecutor: Send + Sync {
58    /// Execute the step and return structured output.
59    ///
60    /// # Errors
61    ///
62    /// Returns [`EngineError`] if the operation fails.
63    fn execute(
64        &self,
65        provider: &Arc<dyn AgentProvider>,
66    ) -> impl Future<Output = Result<StepOutput, EngineError>> + Send;
67}
68
69/// Execute a [`StepConfig`] and return structured output.
70///
71/// # Errors
72///
73/// Returns [`EngineError::Operation`] if the operation fails.
74///
75/// # Examples
76///
77/// ```no_run
78/// use ironflow_engine::config::{StepConfig, ShellConfig};
79/// use ironflow_engine::executor::execute_step_config;
80/// use ironflow_core::provider::AgentProvider;
81/// use ironflow_core::providers::claude::ClaudeCodeProvider;
82/// use std::sync::Arc;
83///
84/// # async fn example() -> Result<(), ironflow_engine::error::EngineError> {
85/// let provider: Arc<dyn AgentProvider> = Arc::new(ClaudeCodeProvider::new());
86/// let config = StepConfig::Shell(ShellConfig::new("echo hello"));
87/// let output = execute_step_config(&config, &provider).await?;
88/// # Ok(())
89/// # }
90/// ```
91pub async fn execute_step_config(
92    config: &StepConfig,
93    provider: &Arc<dyn AgentProvider>,
94) -> Result<StepOutput, EngineError> {
95    let _kind = match config {
96        StepConfig::Shell(_) => "shell",
97        StepConfig::Http(_) => "http",
98        StepConfig::Agent(_) => "agent",
99        StepConfig::Workflow(_) => "workflow",
100        StepConfig::Approval(_) => "approval",
101    };
102
103    let result = match config {
104        StepConfig::Shell(cfg) => ShellExecutor::new(cfg).execute(provider).await,
105        StepConfig::Http(cfg) => HttpExecutor::new(cfg).execute(provider).await,
106        StepConfig::Agent(cfg) => AgentExecutor::new(cfg).execute(provider).await,
107        StepConfig::Workflow(_) => Err(EngineError::StepConfig(
108            "workflow steps are executed by WorkflowContext, not the executor".to_string(),
109        )),
110        StepConfig::Approval(_) => Err(EngineError::StepConfig(
111            "approval steps are executed by WorkflowContext, not the executor".to_string(),
112        )),
113    };
114
115    #[cfg(feature = "prometheus")]
116    {
117        use ironflow_core::metric_names::{
118            STATUS_ERROR, STATUS_SUCCESS, STEP_DURATION_SECONDS, STEPS_TOTAL,
119        };
120        use metrics::{counter, histogram};
121        let status = if result.is_ok() {
122            STATUS_SUCCESS
123        } else {
124            STATUS_ERROR
125        };
126        counter!(STEPS_TOTAL, "kind" => _kind, "status" => status).increment(1);
127        if let Ok(ref output) = result {
128            histogram!(STEP_DURATION_SECONDS, "kind" => _kind)
129                .record(output.duration_ms as f64 / 1000.0);
130        }
131    }
132
133    result
134}
ironflow_engine/executor/mod.rs

ironflow_engine/executor/
mod.rs
