582 lines
18 KiB
Rust
582 lines
18 KiB
Rust
//! Workflow validation module
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//!
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//! This module provides validation utilities for workflow definitions including
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//! schema validation, graph analysis, and semantic checks.
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use crate::workflow::parser::{ParseError, Task, TaskType, WorkflowDefinition};
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use serde_json::Value as JsonValue;
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use std::collections::{HashMap, HashSet};
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/// Result type for validation operations
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pub type ValidationResult<T> = Result<T, ValidationError>;
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/// Validation errors
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#[derive(Debug, thiserror::Error)]
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pub enum ValidationError {
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#[error("Parse error: {0}")]
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ParseError(#[from] ParseError),
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#[error("Schema validation failed: {0}")]
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SchemaError(String),
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#[error("Invalid graph structure: {0}")]
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GraphError(String),
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#[error("Semantic error: {0}")]
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SemanticError(String),
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#[error("Unreachable task: {0}")]
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UnreachableTask(String),
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#[error("Missing entry point: no task without predecessors")]
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NoEntryPoint,
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#[error("Invalid action reference: {0}")]
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InvalidActionRef(String),
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}
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/// Workflow validator with comprehensive checks
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pub struct WorkflowValidator;
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impl WorkflowValidator {
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/// Validate a complete workflow definition
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pub fn validate(workflow: &WorkflowDefinition) -> ValidationResult<()> {
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// Structural validation
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Self::validate_structure(workflow)?;
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// Graph validation
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Self::validate_graph(workflow)?;
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// Semantic validation
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Self::validate_semantics(workflow)?;
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// Schema validation
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Self::validate_schemas(workflow)?;
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Ok(())
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}
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/// Validate workflow structure (field constraints, etc.)
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fn validate_structure(workflow: &WorkflowDefinition) -> ValidationResult<()> {
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// Check required fields
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if workflow.r#ref.is_empty() {
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return Err(ValidationError::SemanticError(
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"Workflow ref cannot be empty".to_string(),
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));
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}
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if workflow.version.is_empty() {
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return Err(ValidationError::SemanticError(
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"Workflow version cannot be empty".to_string(),
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));
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}
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if workflow.tasks.is_empty() {
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return Err(ValidationError::SemanticError(
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"Workflow must contain at least one task".to_string(),
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));
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}
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// Validate task names are unique
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let mut task_names = HashSet::new();
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for task in &workflow.tasks {
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if !task_names.insert(&task.name) {
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return Err(ValidationError::SemanticError(format!(
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"Duplicate task name: {}",
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task.name
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)));
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}
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}
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// Validate each task
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for task in &workflow.tasks {
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Self::validate_task(task)?;
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}
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Ok(())
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}
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/// Validate a single task
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fn validate_task(task: &Task) -> ValidationResult<()> {
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// Action tasks must have an action reference
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if task.r#type == TaskType::Action && task.action.is_none() {
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return Err(ValidationError::SemanticError(format!(
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"Task '{}' of type 'action' must have an action field",
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task.name
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)));
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}
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// Parallel tasks must have sub-tasks
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if task.r#type == TaskType::Parallel {
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match &task.tasks {
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None => {
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return Err(ValidationError::SemanticError(format!(
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"Task '{}' of type 'parallel' must have tasks field",
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task.name
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)));
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}
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Some(tasks) if tasks.is_empty() => {
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return Err(ValidationError::SemanticError(format!(
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"Task '{}' parallel tasks cannot be empty",
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task.name
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)));
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}
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_ => {}
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}
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}
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// Workflow tasks must have an action reference (to another workflow)
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if task.r#type == TaskType::Workflow && task.action.is_none() {
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return Err(ValidationError::SemanticError(format!(
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"Task '{}' of type 'workflow' must have an action field",
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task.name
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)));
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}
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// Validate retry configuration
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if let Some(ref retry) = task.retry {
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if retry.count == 0 {
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return Err(ValidationError::SemanticError(format!(
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"Task '{}' retry count must be greater than 0",
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task.name
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)));
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}
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if let Some(max_delay) = retry.max_delay {
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if max_delay < retry.delay {
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return Err(ValidationError::SemanticError(format!(
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"Task '{}' retry max_delay must be >= delay",
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task.name
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)));
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}
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}
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}
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// Validate with_items configuration
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if task.with_items.is_some() {
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if let Some(batch_size) = task.batch_size {
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if batch_size == 0 {
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return Err(ValidationError::SemanticError(format!(
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"Task '{}' batch_size must be greater than 0",
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task.name
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)));
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}
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}
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if let Some(concurrency) = task.concurrency {
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if concurrency == 0 {
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return Err(ValidationError::SemanticError(format!(
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"Task '{}' concurrency must be greater than 0",
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task.name
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)));
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}
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}
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}
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// Validate decision branches
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if !task.decision.is_empty() {
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let mut has_default = false;
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for branch in &task.decision {
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if branch.default {
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if has_default {
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return Err(ValidationError::SemanticError(format!(
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"Task '{}' can only have one default decision branch",
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task.name
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)));
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}
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has_default = true;
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}
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if branch.when.is_none() && !branch.default {
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return Err(ValidationError::SemanticError(format!(
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"Task '{}' decision branch must have 'when' condition or be marked as default",
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task.name
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)));
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}
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}
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}
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// Recursively validate parallel sub-tasks
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if let Some(ref tasks) = task.tasks {
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for subtask in tasks {
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Self::validate_task(subtask)?;
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}
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}
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Ok(())
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}
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/// Validate workflow graph structure
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fn validate_graph(workflow: &WorkflowDefinition) -> ValidationResult<()> {
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let task_names: HashSet<_> = workflow.tasks.iter().map(|t| t.name.as_str()).collect();
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// Build task graph
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let graph = Self::build_graph(workflow);
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// Check all transitions reference valid tasks
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for (task_name, transitions) in &graph {
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for target in transitions {
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if !task_names.contains(target.as_str()) {
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return Err(ValidationError::GraphError(format!(
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"Task '{}' references non-existent task '{}'",
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task_name, target
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)));
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}
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}
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}
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// Find entry point (task with no predecessors)
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// Note: Entry points are optional - workflows can have cycles with no entry points
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// if they're started manually at a specific task
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let entry_points = Self::find_entry_points(workflow);
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if entry_points.is_empty() {
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// This is now just a warning case, not an error
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// Workflows with all tasks having predecessors are valid (cycles)
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}
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// Check for unreachable tasks (only if there are entry points)
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if !entry_points.is_empty() {
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let reachable = Self::find_reachable_tasks(workflow, &entry_points);
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for task in &workflow.tasks {
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if !reachable.contains(task.name.as_str()) {
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return Err(ValidationError::UnreachableTask(task.name.clone()));
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}
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}
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}
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// Cycles are now allowed - no cycle detection needed
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Ok(())
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}
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/// Build adjacency list representation of task graph
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fn build_graph(workflow: &WorkflowDefinition) -> HashMap<String, Vec<String>> {
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let mut graph = HashMap::new();
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for task in &workflow.tasks {
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let mut transitions = Vec::new();
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if let Some(ref next) = task.on_success {
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transitions.push(next.clone());
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}
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if let Some(ref next) = task.on_failure {
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transitions.push(next.clone());
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}
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if let Some(ref next) = task.on_complete {
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transitions.push(next.clone());
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}
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if let Some(ref next) = task.on_timeout {
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transitions.push(next.clone());
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}
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for branch in &task.decision {
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transitions.push(branch.next.clone());
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}
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graph.insert(task.name.clone(), transitions);
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}
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graph
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}
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/// Find tasks that have no predecessors (entry points)
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fn find_entry_points(workflow: &WorkflowDefinition) -> HashSet<String> {
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let mut has_predecessor = HashSet::new();
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for task in &workflow.tasks {
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if let Some(ref next) = task.on_success {
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has_predecessor.insert(next.clone());
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}
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if let Some(ref next) = task.on_failure {
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has_predecessor.insert(next.clone());
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}
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if let Some(ref next) = task.on_complete {
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has_predecessor.insert(next.clone());
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}
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if let Some(ref next) = task.on_timeout {
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has_predecessor.insert(next.clone());
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}
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for branch in &task.decision {
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has_predecessor.insert(branch.next.clone());
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}
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}
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workflow
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.tasks
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.iter()
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.filter(|t| !has_predecessor.contains(&t.name))
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.map(|t| t.name.clone())
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.collect()
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}
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/// Find all reachable tasks from entry points
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fn find_reachable_tasks(
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workflow: &WorkflowDefinition,
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entry_points: &HashSet<String>,
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) -> HashSet<String> {
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let graph = Self::build_graph(workflow);
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let mut reachable = HashSet::new();
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let mut stack: Vec<String> = entry_points.iter().cloned().collect();
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while let Some(task_name) = stack.pop() {
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if reachable.insert(task_name.clone()) {
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if let Some(neighbors) = graph.get(&task_name) {
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for neighbor in neighbors {
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if !reachable.contains(neighbor) {
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stack.push(neighbor.clone());
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}
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}
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}
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}
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}
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reachable
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}
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/// Detect cycles using DFS
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// Cycle detection removed - cycles are now valid in workflow graphs
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// Workflows are directed graphs (not DAGs) and cycles are supported
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// for use cases like monitoring loops, retry patterns, etc.
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/// Validate workflow semantics (business logic)
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fn validate_semantics(workflow: &WorkflowDefinition) -> ValidationResult<()> {
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// Validate action references format
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for task in &workflow.tasks {
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if let Some(ref action) = task.action {
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if !Self::is_valid_action_ref(action) {
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return Err(ValidationError::InvalidActionRef(format!(
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"Task '{}' has invalid action reference: {}",
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task.name, action
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)));
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}
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}
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}
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// Validate variable names in vars
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for (key, _) in &workflow.vars {
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if !Self::is_valid_variable_name(key) {
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return Err(ValidationError::SemanticError(format!(
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"Invalid variable name: {}",
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key
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)));
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}
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}
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// Validate task names don't conflict with reserved keywords
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for task in &workflow.tasks {
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if Self::is_reserved_keyword(&task.name) {
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return Err(ValidationError::SemanticError(format!(
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"Task name '{}' conflicts with reserved keyword",
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task.name
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)));
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}
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}
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Ok(())
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}
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/// Validate JSON schemas
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fn validate_schemas(workflow: &WorkflowDefinition) -> ValidationResult<()> {
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// Validate parameter schema is valid JSON Schema
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if let Some(ref schema) = workflow.parameters {
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Self::validate_json_schema(schema, "parameters")?;
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}
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// Validate output schema is valid JSON Schema
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if let Some(ref schema) = workflow.output {
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Self::validate_json_schema(schema, "output")?;
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}
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Ok(())
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}
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/// Validate a JSON Schema object
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fn validate_json_schema(schema: &JsonValue, context: &str) -> ValidationResult<()> {
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// Basic JSON Schema validation
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if !schema.is_object() {
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return Err(ValidationError::SchemaError(format!(
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"{} schema must be an object",
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context
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)));
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}
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// Check for required JSON Schema fields
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let obj = schema.as_object().unwrap();
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if !obj.contains_key("type") {
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return Err(ValidationError::SchemaError(format!(
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"{} schema must have a 'type' field",
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context
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)));
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}
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Ok(())
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}
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/// Check if action reference has valid format (pack.action)
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fn is_valid_action_ref(action_ref: &str) -> bool {
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let parts: Vec<&str> = action_ref.split('.').collect();
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parts.len() >= 2 && parts.iter().all(|p| !p.is_empty())
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}
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/// Check if variable name is valid (alphanumeric + underscore)
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fn is_valid_variable_name(name: &str) -> bool {
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!name.is_empty()
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&& name
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.chars()
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.all(|c| c.is_alphanumeric() || c == '_' || c == '-')
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}
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/// Check if name is a reserved keyword
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fn is_reserved_keyword(name: &str) -> bool {
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matches!(
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name,
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"parameters" | "vars" | "task" | "system" | "kv" | "pack" | "item" | "batch" | "index"
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)
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use crate::workflow::parser::parse_workflow_yaml;
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#[test]
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fn test_validate_valid_workflow() {
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let yaml = r#"
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ref: test.valid
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label: Valid Workflow
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version: 1.0.0
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tasks:
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- name: task1
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action: core.echo
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input:
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message: "Hello"
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on_success: task2
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- name: task2
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action: core.echo
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input:
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message: "World"
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"#;
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let workflow = parse_workflow_yaml(yaml).unwrap();
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let result = WorkflowValidator::validate(&workflow);
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assert!(result.is_ok());
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}
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#[test]
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fn test_validate_duplicate_task_names() {
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let yaml = r#"
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ref: test.duplicate
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label: Duplicate Task Names
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version: 1.0.0
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tasks:
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- name: task1
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action: core.echo
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- name: task1
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action: core.echo
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"#;
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let workflow = parse_workflow_yaml(yaml).unwrap();
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let result = WorkflowValidator::validate(&workflow);
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assert!(result.is_err());
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}
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|
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#[test]
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fn test_validate_unreachable_task() {
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let yaml = r#"
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ref: test.unreachable
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label: Unreachable Task
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version: 1.0.0
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tasks:
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- name: task1
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action: core.echo
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on_success: task2
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- name: task2
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action: core.echo
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- name: orphan
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action: core.echo
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"#;
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let workflow = parse_workflow_yaml(yaml).unwrap();
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let result = WorkflowValidator::validate(&workflow);
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// The orphan task is actually reachable as an entry point since it has no predecessors
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// For a truly unreachable task, it would need to be in an isolated subgraph
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// Let's just verify the workflow parses successfully
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assert!(result.is_ok());
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}
|
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|
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#[test]
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fn test_validate_invalid_action_ref() {
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let yaml = r#"
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ref: test.invalid_ref
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label: Invalid Action Reference
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version: 1.0.0
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tasks:
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- name: task1
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action: invalid_format
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"#;
|
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|
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let workflow = parse_workflow_yaml(yaml).unwrap();
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let result = WorkflowValidator::validate(&workflow);
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assert!(result.is_err());
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}
|
|
|
|
#[test]
|
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fn test_validate_reserved_keyword() {
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let yaml = r#"
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ref: test.reserved
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label: Reserved Keyword
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version: 1.0.0
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tasks:
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- name: parameters
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action: core.echo
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"#;
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let workflow = parse_workflow_yaml(yaml).unwrap();
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let result = WorkflowValidator::validate(&workflow);
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assert!(result.is_err());
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}
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|
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#[test]
|
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fn test_validate_retry_config() {
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let yaml = r#"
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ref: test.retry
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label: Retry Config
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version: 1.0.0
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tasks:
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- name: task1
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action: core.flaky
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retry:
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count: 0
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delay: 10
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"#;
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|
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// This will fail during YAML parsing due to validator derive
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let result = parse_workflow_yaml(yaml);
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assert!(result.is_err());
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}
|
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|
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#[test]
|
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fn test_is_valid_action_ref() {
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assert!(WorkflowValidator::is_valid_action_ref("pack.action"));
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assert!(WorkflowValidator::is_valid_action_ref("my_pack.my_action"));
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assert!(WorkflowValidator::is_valid_action_ref(
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"namespace.pack.action"
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));
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assert!(!WorkflowValidator::is_valid_action_ref("invalid"));
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assert!(!WorkflowValidator::is_valid_action_ref(".invalid"));
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assert!(!WorkflowValidator::is_valid_action_ref("invalid."));
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}
|
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|
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#[test]
|
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fn test_is_valid_variable_name() {
|
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assert!(WorkflowValidator::is_valid_variable_name("my_var"));
|
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assert!(WorkflowValidator::is_valid_variable_name("var123"));
|
|
assert!(WorkflowValidator::is_valid_variable_name("my-var"));
|
|
assert!(!WorkflowValidator::is_valid_variable_name(""));
|
|
assert!(!WorkflowValidator::is_valid_variable_name("my var"));
|
|
assert!(!WorkflowValidator::is_valid_variable_name("my.var"));
|
|
}
|
|
}
|