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package cmd
import (
"context"
goErr "errors"
"fmt"
"net"
"os"
"os/exec"
"os/signal"
"regexp"
"strconv"
"strings"
"syscall"
"github.com/railwayapp/cli/entity"
"github.com/railwayapp/cli/errors"
"github.com/railwayapp/cli/ui"
)
var RAIL_PORT = 4411
func (h *Handler) getEnvironment(ctx context.Context, environmentName string) (*entity.Environment, error) {
if environmentName == "" {
return h.ctrl.GetCurrentEnvironment(ctx)
}
return h.ctrl.GetEnvironmentByName(ctx, environmentName)
}
func (h *Handler) Run(ctx context.Context, req *entity.CommandRequest) error {
isEphemeral := false
for _, arg := range req.Args {
if arg == "--ephemeral" {
isEphemeral = true
}
}
parsedArgs := make([]string, 0)
rgxEnvironment, err := regexp.Compile("--environment=(.*)")
if err != nil {
return err
}
rgxService, err := regexp.Compile("--service=(.*)")
if err != nil {
return err
}
targetEnvironment := ""
var targetServiceName *string
// Parse --environment={ENV} and --service={SERVICE} from args
for _, arg := range req.Args {
if matched := rgxEnvironment.FindStringSubmatch(arg); matched != nil {
if len(matched) < 2 {
return goErr.New("missing environment selection! \n(e.g --environment=production)")
}
targetEnvironment = matched[1]
} else if matched := rgxService.FindStringSubmatch(arg); matched != nil {
if len(matched) < 2 {
return goErr.New("missing service selection! \n(e.g --service=serviceName)")
}
targetServiceName = &matched[1]
} else {
parsedArgs = append(parsedArgs, arg)
}
}
projectCfg, err := h.ctrl.GetProjectConfigs(ctx)
if err != nil {
return err
}
environment, err := h.getEnvironment(ctx, targetEnvironment)
if err != nil {
return err
}
// Add something to the ephemeral env name
if isEphemeral {
environmentName := fmt.Sprintf("%s-ephemeral", environment.Name)
fmt.Printf("Spinning up Ephemeral Environment: %s\n", ui.BlueText(environmentName))
// Create new environment for this run
environment, err = h.ctrl.CreateEphemeralEnvironment(ctx, &entity.CreateEphemeralEnvironmentRequest{
Name: environmentName,
ProjectID: projectCfg.Project,
BaseEnvironmentID: environment.Id,
})
if err != nil {
return err
}
fmt.Println("Done!")
}
envs, err := h.ctrl.GetEnvsForService(ctx, targetServiceName)
if err != nil {
return err
}
pwd, err := os.Getwd()
if err != nil {
return err
}
hasDockerfile := true
if _, err := os.Stat(fmt.Sprintf("%s/Dockerfile", pwd)); os.IsNotExist(err) {
hasDockerfile = false
}
if len(parsedArgs) == 0 && hasDockerfile {
return h.runInDocker(ctx, pwd, envs)
} else if len(parsedArgs) == 0 {
return errors.CommandNotSpecified
}
cmd := exec.CommandContext(ctx, parsedArgs[0], parsedArgs[1:]...)
cmd.Env = os.Environ()
// Inject railway envs
for k, v := range *envs {
cmd.Env = append(cmd.Env, fmt.Sprintf("%s=%+v", k, v))
}
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stdout
cmd.Stdin = os.Stdin
catchSignals(ctx, cmd, nil)
err = cmd.Run()
if isEphemeral {
// Teardown Environment
fmt.Println("Tearing down ephemeral environment...")
err := h.ctrl.DeleteEnvironment(ctx, &entity.DeleteEnvironmentRequest{
EnvironmentId: environment.Id,
ProjectID: projectCfg.Project,
})
if err != nil {
return err
}
fmt.Println("Done!")
}
if err != nil {
fmt.Println(err.Error())
if exitError, ok := err.(*exec.ExitError); ok {
os.Exit(exitError.ExitCode())
}
os.Exit(1)
}
printLooksGood()
return nil
}
func (h *Handler) runInDocker(ctx context.Context, pwd string, envs *entity.Envs) error {
// Start building the image
projectCfg, err := h.ctrl.GetProjectConfigs(ctx)
if err != nil {
return err
}
project, err := h.ctrl.GetProject(ctx, projectCfg.Project)
if err != nil {
return err
}
// Strip characters not allowed in Docker image names
environment, err := h.ctrl.GetCurrentEnvironment(ctx)
if err != nil {
return err
}
sanitiser := regexp.MustCompile(`[^A-Za-z0-9_-]`)
imageNameWithoutNsOrTag := strings.ToLower(sanitiser.ReplaceAllString(project.Name, "") + "-" + sanitiser.ReplaceAllString(environment.Name, ""))
image := fmt.Sprintf("railway-local/%s:latest", imageNameWithoutNsOrTag)
buildArgs := []string{"build", "-q", "-t", image, pwd}
// Build up env
for k, v := range *envs {
buildArgs = append(buildArgs, "--build-arg", fmt.Sprintf("%s=\"%+v\"", k, v))
}
buildCmd := exec.CommandContext(ctx, "docker", buildArgs...)
fmt.Printf("Building %s from Dockerfile...\n", ui.GreenText(image))
buildCmd.Stdout = os.Stdout
buildCmd.Stderr = os.Stderr
err = buildCmd.Start()
if err != nil {
return err
}
err = buildCmd.Wait()
if err != nil {
return err
}
fmt.Printf("🎉 Built %s\n", ui.GreenText(image))
// Attempt to use
internalPort := envs.Get("PORT")
externalPort, err := getAvailablePort()
if err != nil {
return err
}
if internalPort == "" {
internalPort = externalPort
}
// Start running the image
fmt.Printf("🚂 Running at %s\n\n", ui.GreenText(fmt.Sprintf("127.0.0.1:%s", externalPort)))
runArgs := []string{"run", "--init", "--rm", "-p", fmt.Sprintf("127.0.0.1:%s:%s", externalPort, internalPort), "-e", fmt.Sprintf("PORT=%s", internalPort), "-d"}
// Build up env
for k, v := range *envs {
runArgs = append(runArgs, "-e", fmt.Sprintf("%s=%+v", k, v))
}
runArgs = append(runArgs, image)
// Run the container
rawContainerId, err := exec.CommandContext(ctx, "docker", runArgs...).Output()
if err != nil {
return err
}
// Get the container ID
containerId := strings.TrimSpace(string(rawContainerId))
// Attach to the container
logCmd := exec.CommandContext(ctx, "docker", "logs", "-f", containerId)
logCmd.Stdout = os.Stdout
logCmd.Stderr = os.Stderr
err = logCmd.Start()
if err != nil {
return err
}
// Listen for cancel to remove the container
catchSignals(ctx, logCmd, func() {
err = exec.Command("docker", "rm", "-f", string(containerId)).Run()
})
err = logCmd.Wait()
if err != nil && !strings.Contains(err.Error(), "255") {
// 255 is a graceeful exit with ctrl + c
return err
}
printLooksGood()
return nil
}
func getAvailablePort() (string, error) {
searchRange := 64
for i := RAIL_PORT; i < RAIL_PORT+searchRange; i++ {
if isAvailable(i) {
return strconv.Itoa(i), nil
}
}
return "", fmt.Errorf("Couldn't find available port between %d and %d", RAIL_PORT, RAIL_PORT+searchRange)
}
func isAvailable(port int) bool {
ln, err := net.Listen("tcp", fmt.Sprintf(":%d", port))
if err != nil {
return false
}
_ = ln.Close()
return true
}
func catchSignals(ctx context.Context, cmd *exec.Cmd, onSignal context.CancelFunc) {
sigs := make(chan os.Signal, 1)
signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)
go func() {
sig := <-sigs
err := cmd.Process.Signal(sig)
if onSignal != nil {
onSignal()
}
if err != nil {
fmt.Println("Child process error: \n", err)
}
}()
}
func printLooksGood() {
// Get space between last output and this message
fmt.Println()
fmt.Printf(
"🚄 Looks good? Then put it on the train and deploy with `%s`!\n",
ui.GreenText("railway up"),
)
}