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queue.go

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package executor

import (

"bytes"

"encoding/json"

"fmt"

"io"

"log"

gorillaWs "github.com/gorilla/websocket"

"github.com/semanser/ai-coder/agent"

gmodel "github.com/semanser/ai-coder/graph/model"

"github.com/semanser/ai-coder/graph/subscriptions"

"github.com/semanser/ai-coder/models"

"github.com/semanser/ai-coder/websocket"

"gorm.io/gorm"

)

var queue = make(chan models.Task, 1000)

func AddCommand(task models.Task) {

queue <- task

log.Printf("Command %d added to the queue", task.ID)

}

func ProcessQueue(db *gorm.DB) {

log.Println("Starting tasks processor")

go func() {

for {

log.Println("Waiting for a task")

task := <-queue

log.Printf("Processing command %d of type %s", task.ID, task.Type)

// Input tasks are added by the user optimistically on the client

// so they should not be broadcasted back to the client

if task.Type != models.Input {

subscriptions.BroadcastTaskAdded(task.FlowID, &gmodel.Task{

ID: task.ID,

Message: task.Message,

Type: gmodel.TaskType(task.Type),

CreatedAt: task.CreatedAt,

Status: gmodel.TaskStatus(task.Status),

Args: task.Args.String(),

Results: task.Results,

})

}

if task.Type == models.Input {

nextTask, err := getNextTask(db, task.FlowID)

if err != nil {

log.Printf("failed to process input: %w", err)

continue

}

AddCommand(*nextTask)

}

if task.Type == models.Ask {

err := processAskTask(db, task)

if err != nil {

log.Printf("failed to process ask: %w", err)

continue

}

}

if task.Type == models.Terminal {

err := processTerminalTask(db, task)

if err != nil {

log.Printf("failed to process terminal: %w", err)

continue

}

nextTask, err := getNextTask(db, task.FlowID)

if err != nil {

log.Printf("failed to get next task: %w", err)

continue

}

AddCommand(*nextTask)

}

if task.Type == models.Code {

err := processCodeTask(db, task)

if err != nil {

log.Printf("failed to process code: %w", err)

continue

}

nextTask, err := getNextTask(db, task.FlowID)

if err != nil {

log.Printf("failed to get next task: %w", err)

continue

}

AddCommand(*nextTask)

}

}

}()

}

func processAskTask(db *gorm.DB, task models.Task) error {

tx := db.Updates(models.Task{

ID: task.ID,

Status: models.Finished,

})

if tx.Error != nil {

return fmt.Errorf("failed to find task with id %d: %w", task.ID, tx.Error)

}

return nil

}

func processTerminalTask(db *gorm.DB, task models.Task) error {

flowId := fmt.Sprint(task.FlowID)

var args = agent.TerminalArgs{}

err := json.Unmarshal(task.Args, &args)

if err != nil {

return fmt.Errorf("failed to unmarshal args: %v", err)

}

// Send the input to the websocket channel

err = websocket.SendToChannel(flowId, websocket.FormatTerminalInput(args.Input))

if err != nil {

log.Printf("failed to send message to channel: %w", err)

}

conn, err := websocket.GetConnection(flowId)

if err != nil {

return fmt.Errorf("failed to get connection: %w", err)

}

w, err := conn.NextWriter(gorillaWs.BinaryMessage)

// Write the terminal output to both to the websocket and to the database

var result = &bytes.Buffer{}

multi := io.MultiWriter(w, result)

if err != nil {

return fmt.Errorf("failed to get writer: %w", err)

}

err = ExecCommand(GenerateContainerName(task.FlowID), args.Input, multi)

if err != nil {

return fmt.Errorf("failed to execute command: %w", err)

}

db.Updates(models.Task{

ID: task.ID,

Results: result.String(),

Status: models.Finished,

})

err = w.Close()

if err != nil {

return fmt.Errorf("failed to close writer: %w", err)

}

return nil

}

func processCodeTask(db *gorm.DB, task models.Task) error {

var args = agent.CodeArgs{}

err := json.Unmarshal(task.Args, &args)

if err != nil {

return fmt.Errorf("failed to unmarshal args: %v", err)

}

var cmd = ""

var r = bytes.Buffer{}

if args.Action == agent.ReadFile {

cmd = fmt.Sprintf("cat %s", args.Path)

}

if args.Action == agent.UpdateFile {

cmd = fmt.Sprintf("echo %s > %s", args.Content, args.Path)

}

err = ExecCommand(GenerateContainerName(task.FlowID), cmd, &r)

if err != nil {

return fmt.Errorf("failed to execute command: %w", err)

}

db.Updates(models.Task{

ID: task.ID,

Results: r.String(),

})

return nil

}

func getNextTask(db *gorm.DB, flowId uint) (*models.Task, error) {

flow := models.Flow{}

tx := db.First(&models.Flow{}, flowId).Preload("Tasks").Find(&flow)

if tx.Error != nil {

return nil, fmt.Errorf("failed to find flow with id %d: %w", flowId, tx.Error)

}

const maxResultsLength = 4000

for i, task := range flow.Tasks {

// Limit the number of result characters since some output commands can have a lot of output

if len(task.Results) > maxResultsLength {

// Get the last N symbols from the output

flow.Tasks[i].Results = flow.Tasks[i].Results[len(flow.Tasks[i].Results)-maxResultsLength:]

}

}

c, err := agent.NextTask(agent.AgentPrompt{

Tasks: flow.Tasks,

DockerImage: flow.DockerImage,

})

if err != nil {

return nil, fmt.Errorf("failed to get next command: %w", err)

}

nextTask := &models.Task{

Args: c.Args,

Message: c.Message,

Type: c.Type,

Status: models.InProgress,

FlowID: flowId,

}

tx = db.Save(nextTask)

if tx.Error != nil {

return nil, fmt.Errorf("failed to save command: %w", tx.Error)

}

return nextTask, nil

}