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package executor
import (
"context"
"fmt"
"log/slog"
"sync"
"time"
"github.com/thepeterstone/claudomator/internal/storage"
"github.com/thepeterstone/claudomator/internal/task"
"github.com/google/uuid"
)
// Runner executes a single task and returns the result.
type Runner interface {
Run(ctx context.Context, t *task.Task, exec *storage.Execution) error
}
// Pool manages a bounded set of concurrent task workers.
type Pool struct {
maxConcurrent int
runner Runner
store *storage.DB
logger *slog.Logger
mu sync.Mutex
active int
resultCh chan *Result
}
// Result is emitted when a task execution completes.
type Result struct {
TaskID string
Execution *storage.Execution
Err error
}
func NewPool(maxConcurrent int, runner Runner, store *storage.DB, logger *slog.Logger) *Pool {
if maxConcurrent < 1 {
maxConcurrent = 1
}
return &Pool{
maxConcurrent: maxConcurrent,
runner: runner,
store: store,
logger: logger,
resultCh: make(chan *Result, maxConcurrent*2),
}
}
// Submit dispatches a task for execution. Blocks if pool is at capacity.
func (p *Pool) Submit(ctx context.Context, t *task.Task) error {
p.mu.Lock()
if p.active >= p.maxConcurrent {
active := p.active
max := p.maxConcurrent
p.mu.Unlock()
return fmt.Errorf("executor pool at capacity (%d/%d)", active, max)
}
p.active++
p.mu.Unlock()
go p.execute(ctx, t)
return nil
}
// Results returns the channel for reading execution results.
func (p *Pool) Results() <-chan *Result {
return p.resultCh
}
// ActiveCount returns the number of currently running tasks.
func (p *Pool) ActiveCount() int {
p.mu.Lock()
defer p.mu.Unlock()
return p.active
}
func (p *Pool) execute(ctx context.Context, t *task.Task) {
defer func() {
p.mu.Lock()
p.active--
p.mu.Unlock()
}()
// Wait for all dependencies to complete before starting execution.
if len(t.DependsOn) > 0 {
if err := p.waitForDependencies(ctx, t); err != nil {
now := time.Now().UTC()
exec := &storage.Execution{
ID: uuid.New().String(),
TaskID: t.ID,
StartTime: now,
EndTime: now,
Status: "FAILED",
ErrorMsg: err.Error(),
}
if createErr := p.store.CreateExecution(exec); createErr != nil {
p.logger.Error("failed to create execution record", "error", createErr)
}
p.store.UpdateTaskState(t.ID, task.StateFailed)
p.resultCh <- &Result{TaskID: t.ID, Execution: exec, Err: err}
return
}
}
execID := uuid.New().String()
exec := &storage.Execution{
ID: execID,
TaskID: t.ID,
StartTime: time.Now().UTC(),
Status: "RUNNING",
}
// Record execution start.
if err := p.store.CreateExecution(exec); err != nil {
p.logger.Error("failed to create execution record", "error", err)
}
if err := p.store.UpdateTaskState(t.ID, task.StateRunning); err != nil {
p.logger.Error("failed to update task state", "error", err)
}
// Apply task timeout.
var cancel context.CancelFunc
if t.Timeout.Duration > 0 {
ctx, cancel = context.WithTimeout(ctx, t.Timeout.Duration)
} else {
ctx, cancel = context.WithCancel(ctx)
}
defer cancel()
// Run the task.
err := p.runner.Run(ctx, t, exec)
exec.EndTime = time.Now().UTC()
if err != nil {
if ctx.Err() == context.DeadlineExceeded {
exec.Status = "TIMED_OUT"
exec.ErrorMsg = "execution timed out"
p.store.UpdateTaskState(t.ID, task.StateTimedOut)
} else if ctx.Err() == context.Canceled {
exec.Status = "CANCELLED"
exec.ErrorMsg = "execution cancelled"
p.store.UpdateTaskState(t.ID, task.StateCancelled)
} else {
exec.Status = "FAILED"
exec.ErrorMsg = err.Error()
p.store.UpdateTaskState(t.ID, task.StateFailed)
}
} else {
if t.ParentTaskID == "" {
exec.Status = "READY"
p.store.UpdateTaskState(t.ID, task.StateReady)
} else {
exec.Status = "COMPLETED"
p.store.UpdateTaskState(t.ID, task.StateCompleted)
}
}
if updateErr := p.store.UpdateExecution(exec); updateErr != nil {
p.logger.Error("failed to update execution", "error", updateErr)
}
p.resultCh <- &Result{TaskID: t.ID, Execution: exec, Err: err}
}
// terminalFailureStates are dependency states that cause the waiting task to fail immediately.
var terminalFailureStates = map[task.State]bool{
task.StateFailed: true,
task.StateTimedOut: true,
task.StateCancelled: true,
task.StateBudgetExceeded: true,
}
// waitForDependencies polls storage until all tasks in t.DependsOn reach COMPLETED,
// or until a dependency enters a terminal failure state or the context is cancelled.
func (p *Pool) waitForDependencies(ctx context.Context, t *task.Task) error {
for {
allDone := true
for _, depID := range t.DependsOn {
dep, err := p.store.GetTask(depID)
if err != nil {
return fmt.Errorf("dependency %q not found: %w", depID, err)
}
if dep.State == task.StateCompleted {
continue
}
if terminalFailureStates[dep.State] {
return fmt.Errorf("dependency %q ended in state %s", depID, dep.State)
}
allDone = false
}
if allDone {
return nil
}
select {
case <-ctx.Done():
return ctx.Err()
case <-time.After(5 * time.Second):
}
}
}
|
