kotoba_workflow_core/
engine.rs

1//! Core workflow engine implementation
2
3use async_trait::async_trait;
4use chrono::Utc;
5use std::collections::HashMap;
6use std::sync::Arc;
7use tokio::sync::RwLock;
8use uuid::Uuid;
9
10use crate::{
11    WorkflowEngineInterface,
12    WorkflowIR,
13    WorkflowExecution,
14    WorkflowExecutionId,
15    ExecutionStatus,
16    WorkflowError,
17};
18
19/// In-memory workflow engine implementation
20#[derive(Debug)]
21pub struct WorkflowEngine {
22    executions: Arc<RwLock<HashMap<WorkflowExecutionId, WorkflowExecution>>>,
23}
24
25impl WorkflowEngine {
26    pub fn new() -> Self {
27        Self {
28            executions: Arc::new(RwLock::new(HashMap::new())),
29        }
30    }
31
32    pub fn builder() -> WorkflowEngineBuilder {
33        WorkflowEngineBuilder::new()
34    }
35}
36
37impl Default for WorkflowEngine {
38    fn default() -> Self {
39        Self::new()
40    }
41}
42
43#[async_trait]
44impl WorkflowEngineInterface for WorkflowEngine {
45    async fn start_workflow(
46        &self,
47        workflow: &WorkflowIR,
48        _context: serde_json::Value,
49    ) -> Result<WorkflowExecutionId, WorkflowError> {
50        let execution_id = WorkflowExecutionId(Uuid::new_v4().to_string());
51        let now = Utc::now();
52
53        let execution = WorkflowExecution {
54            execution_id: execution_id.clone(),
55            workflow_id: workflow.id.clone(),
56            status: ExecutionStatus::Running,
57            created_at: now,
58            updated_at: now,
59            result: None,
60            error: None,
61        };
62
63        // Simulate workflow execution (in a real implementation, this would spawn tasks)
64        let execution_clone = execution.clone();
65        let executions = Arc::clone(&self.executions);
66
67        tokio::spawn(async move {
68            tokio::time::sleep(tokio::time::Duration::from_secs(1)).await;
69
70            let mut executions = executions.write().await;
71            if let Some(mut exec) = executions.get_mut(&execution_clone.execution_id) {
72                exec.status = ExecutionStatus::Completed;
73                exec.updated_at = Utc::now();
74                exec.result = Some(serde_json::json!({"message": "Workflow completed successfully"}));
75            }
76        });
77
78        let mut executions = self.executions.write().await;
79        executions.insert(execution_id.clone(), execution);
80
81        Ok(execution_id)
82    }
83
84    async fn get_execution(
85        &self,
86        execution_id: &WorkflowExecutionId,
87    ) -> Result<Option<WorkflowExecution>, WorkflowError> {
88        let executions = self.executions.read().await;
89        Ok(executions.get(execution_id).cloned())
90    }
91
92    async fn list_executions(&self) -> Result<Vec<WorkflowExecution>, WorkflowError> {
93        let executions = self.executions.read().await;
94        Ok(executions.values().cloned().collect())
95    }
96
97    async fn cancel_execution(
98        &self,
99        execution_id: &WorkflowExecutionId,
100    ) -> Result<(), WorkflowError> {
101        let mut executions = self.executions.write().await;
102        if let Some(mut execution) = executions.get_mut(execution_id) {
103            execution.status = ExecutionStatus::Cancelled;
104            execution.updated_at = Utc::now();
105            Ok(())
106        } else {
107            Err(WorkflowError::NotFound(format!("Execution {} not found", execution_id)))
108        }
109    }
110}
111
112/// Workflow engine builder
113#[derive(Debug, Default)]
114pub struct WorkflowEngineBuilder {
115    // Future: add configuration options
116}
117
118impl WorkflowEngineBuilder {
119    pub fn new() -> Self {
120        Self {}
121    }
122
123    pub fn build(self) -> WorkflowEngine {
124        WorkflowEngine::new()
125    }
126
127    /// Memory storage (default)
128    pub fn with_memory_storage(self) -> Self {
129        // For now, just return self - future versions may support different backends
130        self
131    }
132}
133
kotoba_workflow_core/engine.rs

kotoba_workflow_core/
engine.rs
