mirror of
https://github.com/Crosstalk-Solutions/project-nomad.git
synced 2026-03-28 03:29:25 +01:00
659 lines
23 KiB
TypeScript
659 lines
23 KiB
TypeScript
import Service from '#models/service'
|
|
import Docker from 'dockerode'
|
|
import logger from '@adonisjs/core/services/logger'
|
|
import { inject } from '@adonisjs/core'
|
|
import transmit from '@adonisjs/transmit/services/main'
|
|
import { doResumableDownloadWithRetry } from '../utils/downloads.js'
|
|
import { join } from 'path'
|
|
import { ZIM_STORAGE_PATH } from '../utils/fs.js'
|
|
|
|
@inject()
|
|
export class DockerService {
|
|
public docker: Docker
|
|
private activeInstallations: Set<string> = new Set()
|
|
public static KIWIX_SERVICE_NAME = 'nomad_kiwix_serve'
|
|
public static OLLAMA_SERVICE_NAME = 'nomad_ollama'
|
|
public static QDRANT_SERVICE_NAME = 'nomad_qdrant'
|
|
public static CYBERCHEF_SERVICE_NAME = 'nomad_cyberchef'
|
|
public static FLATNOTES_SERVICE_NAME = 'nomad_flatnotes'
|
|
public static KOLIBRI_SERVICE_NAME = 'nomad_kolibri'
|
|
public static BENCHMARK_SERVICE_NAME = 'nomad_benchmark'
|
|
public static NOMAD_NETWORK = 'project-nomad_default'
|
|
|
|
constructor() {
|
|
// Support both Linux (production) and Windows (development with Docker Desktop)
|
|
const isWindows = process.platform === 'win32'
|
|
if (isWindows) {
|
|
// Windows Docker Desktop uses named pipe
|
|
this.docker = new Docker({ socketPath: '//./pipe/docker_engine' })
|
|
} else {
|
|
// Linux uses Unix socket
|
|
this.docker = new Docker({ socketPath: '/var/run/docker.sock' })
|
|
}
|
|
}
|
|
|
|
async affectContainer(
|
|
serviceName: string,
|
|
action: 'start' | 'stop' | 'restart'
|
|
): Promise<{ success: boolean; message: string }> {
|
|
try {
|
|
const service = await Service.query().where('service_name', serviceName).first()
|
|
if (!service || !service.installed) {
|
|
return {
|
|
success: false,
|
|
message: `Service ${serviceName} not found or not installed`,
|
|
}
|
|
}
|
|
|
|
const containers = await this.docker.listContainers({ all: true })
|
|
const container = containers.find((c) => c.Names.includes(`/${serviceName}`))
|
|
if (!container) {
|
|
return {
|
|
success: false,
|
|
message: `Container for service ${serviceName} not found`,
|
|
}
|
|
}
|
|
|
|
const dockerContainer = this.docker.getContainer(container.Id)
|
|
if (action === 'stop') {
|
|
await dockerContainer.stop()
|
|
return {
|
|
success: true,
|
|
message: `Service ${serviceName} stopped successfully`,
|
|
}
|
|
}
|
|
|
|
if (action === 'restart') {
|
|
await dockerContainer.restart()
|
|
|
|
return {
|
|
success: true,
|
|
message: `Service ${serviceName} restarted successfully`,
|
|
}
|
|
}
|
|
|
|
if (action === 'start') {
|
|
if (container.State === 'running') {
|
|
return {
|
|
success: true,
|
|
message: `Service ${serviceName} is already running`,
|
|
}
|
|
}
|
|
|
|
await dockerContainer.start()
|
|
|
|
return {
|
|
success: true,
|
|
message: `Service ${serviceName} started successfully`,
|
|
}
|
|
}
|
|
|
|
return {
|
|
success: false,
|
|
message: `Invalid action: ${action}. Use 'start', 'stop', or 'restart'.`,
|
|
}
|
|
} catch (error) {
|
|
logger.error(`Error starting service ${serviceName}: ${error.message}`)
|
|
return {
|
|
success: false,
|
|
message: `Failed to start service ${serviceName}: ${error.message}`,
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Fetches the status of all Docker containers related to Nomad services. (those prefixed with 'nomad_')
|
|
*/
|
|
async getServicesStatus(): Promise<
|
|
{
|
|
service_name: string
|
|
status: string
|
|
}[]
|
|
> {
|
|
try {
|
|
const containers = await this.docker.listContainers({ all: true })
|
|
const containerMap = new Map<string, Docker.ContainerInfo>()
|
|
containers.forEach((container) => {
|
|
const name = container.Names[0].replace('/', '')
|
|
if (name.startsWith('nomad_')) {
|
|
containerMap.set(name, container)
|
|
}
|
|
})
|
|
|
|
return Array.from(containerMap.entries()).map(([name, container]) => ({
|
|
service_name: name,
|
|
status: container.State,
|
|
}))
|
|
} catch (error) {
|
|
logger.error(`Error fetching services status: ${error.message}`)
|
|
return []
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Get the URL to access a service based on its configuration.
|
|
* Attempts to return a docker-internal URL using the service name and exposed port.
|
|
* @param serviceName - The name of the service to get the URL for.
|
|
* @returns - The URL as a string, or null if it cannot be determined.
|
|
*/
|
|
async getServiceURL(serviceName: string): Promise<string | null> {
|
|
if (!serviceName || serviceName.trim() === '') {
|
|
return null
|
|
}
|
|
|
|
const service = await Service.query()
|
|
.where('service_name', serviceName)
|
|
.andWhere('installed', true)
|
|
.first()
|
|
|
|
if (!service) {
|
|
return null
|
|
}
|
|
|
|
const hostname = process.env.NODE_ENV === 'production' ? serviceName : 'localhost'
|
|
|
|
// First, check if ui_location is set and is a valid port number
|
|
if (service.ui_location && parseInt(service.ui_location, 10)) {
|
|
return `http://${hostname}:${service.ui_location}`
|
|
}
|
|
|
|
// Next, try to extract a host port from container_config
|
|
const parsedConfig = this._parseContainerConfig(service.container_config)
|
|
if (parsedConfig?.HostConfig?.PortBindings) {
|
|
const portBindings = parsedConfig.HostConfig.PortBindings
|
|
const hostPorts = Object.values(portBindings)
|
|
if (!hostPorts || !Array.isArray(hostPorts) || hostPorts.length === 0) {
|
|
return null
|
|
}
|
|
|
|
const hostPortsArray = hostPorts.flat() as { HostPort: string }[]
|
|
const hostPortsStrings = hostPortsArray.map((binding) => binding.HostPort)
|
|
if (hostPortsStrings.length > 0) {
|
|
return `http://${hostname}:${hostPortsStrings[0]}`
|
|
}
|
|
}
|
|
|
|
// Otherwise, return null if we can't determine a URL
|
|
return null
|
|
}
|
|
|
|
async createContainerPreflight(
|
|
serviceName: string
|
|
): Promise<{ success: boolean; message: string }> {
|
|
const service = await Service.query().where('service_name', serviceName).first()
|
|
if (!service) {
|
|
return {
|
|
success: false,
|
|
message: `Service ${serviceName} not found`,
|
|
}
|
|
}
|
|
|
|
if (service.installed) {
|
|
return {
|
|
success: false,
|
|
message: `Service ${serviceName} is already installed`,
|
|
}
|
|
}
|
|
|
|
// Check if installation is already in progress (database-level)
|
|
if (service.installation_status === 'installing') {
|
|
return {
|
|
success: false,
|
|
message: `Service ${serviceName} installation is already in progress`,
|
|
}
|
|
}
|
|
|
|
// Double-check with in-memory tracking (race condition protection)
|
|
if (this.activeInstallations.has(serviceName)) {
|
|
return {
|
|
success: false,
|
|
message: `Service ${serviceName} installation is already in progress`,
|
|
}
|
|
}
|
|
|
|
// Mark installation as in progress
|
|
this.activeInstallations.add(serviceName)
|
|
service.installation_status = 'installing'
|
|
await service.save()
|
|
|
|
// Check if a service wasn't marked as installed but has an existing container
|
|
// This can happen if the service was created but not properly installed
|
|
// or if the container was removed manually without updating the service status.
|
|
// if (await this._checkIfServiceContainerExists(serviceName)) {
|
|
// const removeResult = await this._removeServiceContainer(serviceName);
|
|
// if (!removeResult.success) {
|
|
// return {
|
|
// success: false,
|
|
// message: `Failed to remove existing container for service ${serviceName}: ${removeResult.message}`,
|
|
// };
|
|
// }
|
|
// }
|
|
|
|
const containerConfig = this._parseContainerConfig(service.container_config)
|
|
|
|
// Execute installation asynchronously and handle cleanup
|
|
this._createContainer(service, containerConfig).catch(async (error) => {
|
|
logger.error(`Installation failed for ${serviceName}: ${error.message}`)
|
|
await this._cleanupFailedInstallation(serviceName)
|
|
})
|
|
|
|
return {
|
|
success: true,
|
|
message: `Service ${serviceName} installation initiated successfully. You can receive updates via server-sent events.`,
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Force reinstall a service by stopping, removing, and recreating its container.
|
|
* This method will also clear any associated volumes/data.
|
|
* Handles edge cases gracefully (e.g., container not running, container not found).
|
|
*/
|
|
async forceReinstall(serviceName: string): Promise<{ success: boolean; message: string }> {
|
|
try {
|
|
const service = await Service.query().where('service_name', serviceName).first()
|
|
if (!service) {
|
|
return {
|
|
success: false,
|
|
message: `Service ${serviceName} not found`,
|
|
}
|
|
}
|
|
|
|
// Check if installation is already in progress
|
|
if (this.activeInstallations.has(serviceName)) {
|
|
return {
|
|
success: false,
|
|
message: `Service ${serviceName} installation is already in progress`,
|
|
}
|
|
}
|
|
|
|
// Mark as installing to prevent concurrent operations
|
|
this.activeInstallations.add(serviceName)
|
|
service.installation_status = 'installing'
|
|
await service.save()
|
|
|
|
this._broadcast(
|
|
serviceName,
|
|
'reinstall-starting',
|
|
`Starting force reinstall for ${serviceName}...`
|
|
)
|
|
|
|
// Step 1: Try to stop and remove the container if it exists
|
|
try {
|
|
const containers = await this.docker.listContainers({ all: true })
|
|
const container = containers.find((c) => c.Names.includes(`/${serviceName}`))
|
|
|
|
if (container) {
|
|
const dockerContainer = this.docker.getContainer(container.Id)
|
|
|
|
// Only try to stop if it's running
|
|
if (container.State === 'running') {
|
|
this._broadcast(serviceName, 'stopping', `Stopping container...`)
|
|
await dockerContainer.stop({ t: 10 }).catch((error) => {
|
|
// If already stopped, continue
|
|
if (!error.message.includes('already stopped')) {
|
|
logger.warn(`Error stopping container: ${error.message}`)
|
|
}
|
|
})
|
|
}
|
|
|
|
// Step 2: Remove the container
|
|
this._broadcast(serviceName, 'removing', `Removing container...`)
|
|
await dockerContainer.remove({ force: true }).catch((error) => {
|
|
logger.warn(`Error removing container: ${error.message}`)
|
|
})
|
|
} else {
|
|
this._broadcast(
|
|
serviceName,
|
|
'no-container',
|
|
`No existing container found, proceeding with installation...`
|
|
)
|
|
}
|
|
} catch (error) {
|
|
logger.warn(`Error during container cleanup: ${error.message}`)
|
|
this._broadcast(serviceName, 'cleanup-warning', `Warning during cleanup: ${error.message}`)
|
|
}
|
|
|
|
// Step 3: Clear volumes/data if needed
|
|
try {
|
|
this._broadcast(serviceName, 'clearing-volumes', `Checking for volumes to clear...`)
|
|
const volumes = await this.docker.listVolumes()
|
|
const serviceVolumes =
|
|
volumes.Volumes?.filter(
|
|
(v) => v.Name.includes(serviceName) || v.Labels?.service === serviceName
|
|
) || []
|
|
|
|
for (const vol of serviceVolumes) {
|
|
try {
|
|
const volume = this.docker.getVolume(vol.Name)
|
|
await volume.remove({ force: true })
|
|
this._broadcast(serviceName, 'volume-removed', `Removed volume: ${vol.Name}`)
|
|
} catch (error) {
|
|
logger.warn(`Failed to remove volume ${vol.Name}: ${error.message}`)
|
|
}
|
|
}
|
|
|
|
if (serviceVolumes.length === 0) {
|
|
this._broadcast(serviceName, 'no-volumes', `No volumes found to clear`)
|
|
}
|
|
} catch (error) {
|
|
logger.warn(`Error during volume cleanup: ${error.message}`)
|
|
this._broadcast(
|
|
serviceName,
|
|
'volume-cleanup-warning',
|
|
`Warning during volume cleanup: ${error.message}`
|
|
)
|
|
}
|
|
|
|
// Step 4: Mark service as uninstalled
|
|
service.installed = false
|
|
service.installation_status = 'installing'
|
|
await service.save()
|
|
|
|
// Step 5: Recreate the container
|
|
this._broadcast(serviceName, 'recreating', `Recreating container...`)
|
|
const containerConfig = this._parseContainerConfig(service.container_config)
|
|
|
|
// Execute installation asynchronously and handle cleanup
|
|
this._createContainer(service, containerConfig).catch(async (error) => {
|
|
logger.error(`Reinstallation failed for ${serviceName}: ${error.message}`)
|
|
await this._cleanupFailedInstallation(serviceName)
|
|
})
|
|
|
|
return {
|
|
success: true,
|
|
message: `Service ${serviceName} force reinstall initiated successfully. You can receive updates via server-sent events.`,
|
|
}
|
|
} catch (error) {
|
|
logger.error(`Force reinstall failed for ${serviceName}: ${error.message}`)
|
|
await this._cleanupFailedInstallation(serviceName)
|
|
return {
|
|
success: false,
|
|
message: `Failed to force reinstall service ${serviceName}: ${error.message}`,
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Handles the long-running process of creating a Docker container for a service.
|
|
* NOTE: This method should not be called directly. Instead, use `createContainerPreflight` to check prerequisites first
|
|
* This method will also transmit server-sent events to the client to notify of progress.
|
|
* @param serviceName
|
|
* @returns
|
|
*/
|
|
async _createContainer(
|
|
service: Service & { dependencies?: Service[] },
|
|
containerConfig: any
|
|
): Promise<void> {
|
|
try {
|
|
this._broadcast(service.service_name, 'initializing', '')
|
|
|
|
let dependencies = []
|
|
if (service.depends_on) {
|
|
const dependency = await Service.query().where('service_name', service.depends_on).first()
|
|
if (dependency) {
|
|
dependencies.push(dependency)
|
|
}
|
|
}
|
|
|
|
// First, check if the service has any dependencies that need to be installed first
|
|
if (dependencies && dependencies.length > 0) {
|
|
this._broadcast(
|
|
service.service_name,
|
|
'checking-dependencies',
|
|
`Checking dependencies for service ${service.service_name}...`
|
|
)
|
|
for (const dependency of dependencies) {
|
|
if (!dependency.installed) {
|
|
this._broadcast(
|
|
service.service_name,
|
|
'dependency-not-installed',
|
|
`Dependency service ${dependency.service_name} is not installed. Installing it first...`
|
|
)
|
|
await this._createContainer(
|
|
dependency,
|
|
this._parseContainerConfig(dependency.container_config)
|
|
)
|
|
} else {
|
|
this._broadcast(
|
|
service.service_name,
|
|
'dependency-installed',
|
|
`Dependency service ${dependency.service_name} is already installed.`
|
|
)
|
|
}
|
|
}
|
|
}
|
|
|
|
const imageExists = await this._checkImageExists(service.container_image)
|
|
if (imageExists) {
|
|
this._broadcast(
|
|
service.service_name,
|
|
'image-exists',
|
|
`Docker image ${service.container_image} already exists locally. Skipping pull...`
|
|
)
|
|
} else {
|
|
// Start pulling the Docker image and wait for it to complete
|
|
const pullStream = await this.docker.pull(service.container_image)
|
|
this._broadcast(
|
|
service.service_name,
|
|
'pulling',
|
|
`Pulling Docker image ${service.container_image}...`
|
|
)
|
|
await new Promise((res) => this.docker.modem.followProgress(pullStream, res))
|
|
}
|
|
|
|
if (service.service_name === DockerService.KIWIX_SERVICE_NAME) {
|
|
await this._runPreinstallActions__KiwixServe()
|
|
this._broadcast(
|
|
service.service_name,
|
|
'preinstall-complete',
|
|
`Pre-install actions for Kiwix Serve completed successfully.`
|
|
)
|
|
}
|
|
|
|
this._broadcast(
|
|
service.service_name,
|
|
'creating',
|
|
`Creating Docker container for service ${service.service_name}...`
|
|
)
|
|
const container = await this.docker.createContainer({
|
|
Image: service.container_image,
|
|
name: service.service_name,
|
|
...(containerConfig?.User && { User: containerConfig.User }),
|
|
...(containerConfig?.HostConfig && { HostConfig: containerConfig.HostConfig }),
|
|
...(containerConfig?.WorkingDir && { WorkingDir: containerConfig.WorkingDir }),
|
|
...(containerConfig?.ExposedPorts && { ExposedPorts: containerConfig.ExposedPorts }),
|
|
...(containerConfig?.Env && { Env: containerConfig.Env }),
|
|
...(service.container_command ? { Cmd: service.container_command.split(' ') } : {}),
|
|
// Ensure container is attached to the Nomad docker network in production
|
|
...(process.env.NODE_ENV === 'production' && {
|
|
NetworkingConfig: {
|
|
EndpointsConfig: {
|
|
[DockerService.NOMAD_NETWORK]: {},
|
|
},
|
|
},
|
|
}),
|
|
})
|
|
|
|
this._broadcast(
|
|
service.service_name,
|
|
'starting',
|
|
`Starting Docker container for service ${service.service_name}...`
|
|
)
|
|
await container.start()
|
|
|
|
this._broadcast(
|
|
service.service_name,
|
|
'finalizing',
|
|
`Finalizing installation of service ${service.service_name}...`
|
|
)
|
|
service.installed = true
|
|
service.installation_status = 'idle'
|
|
await service.save()
|
|
|
|
// Remove from active installs tracking
|
|
this.activeInstallations.delete(service.service_name)
|
|
|
|
this._broadcast(
|
|
service.service_name,
|
|
'completed',
|
|
`Service ${service.service_name} installation completed successfully.`
|
|
)
|
|
} catch (error) {
|
|
this._broadcast(
|
|
service.service_name,
|
|
'error',
|
|
`Error installing service ${service.service_name}: ${error.message}`
|
|
)
|
|
// Mark install as failed and cleanup
|
|
await this._cleanupFailedInstallation(service.service_name)
|
|
throw new Error(`Failed to install service ${service.service_name}: ${error.message}`)
|
|
}
|
|
}
|
|
|
|
async _checkIfServiceContainerExists(serviceName: string): Promise<boolean> {
|
|
try {
|
|
const containers = await this.docker.listContainers({ all: true })
|
|
return containers.some((container) => container.Names.includes(`/${serviceName}`))
|
|
} catch (error) {
|
|
logger.error(`Error checking if service container exists: ${error.message}`)
|
|
return false
|
|
}
|
|
}
|
|
|
|
async _removeServiceContainer(
|
|
serviceName: string
|
|
): Promise<{ success: boolean; message: string }> {
|
|
try {
|
|
const containers = await this.docker.listContainers({ all: true })
|
|
const container = containers.find((c) => c.Names.includes(`/${serviceName}`))
|
|
if (!container) {
|
|
return { success: false, message: `Container for service ${serviceName} not found` }
|
|
}
|
|
|
|
const dockerContainer = this.docker.getContainer(container.Id)
|
|
await dockerContainer.stop()
|
|
await dockerContainer.remove()
|
|
|
|
return { success: true, message: `Service ${serviceName} container removed successfully` }
|
|
} catch (error) {
|
|
logger.error(`Error removing service container: ${error.message}`)
|
|
return {
|
|
success: false,
|
|
message: `Failed to remove service ${serviceName} container: ${error.message}`,
|
|
}
|
|
}
|
|
}
|
|
|
|
private async _runPreinstallActions__KiwixServe(): Promise<void> {
|
|
/**
|
|
* At least one .zim file must be available before we can start the kiwix container.
|
|
* We'll download the lightweight mini Wikipedia Top 100 zim file for this purpose.
|
|
**/
|
|
const WIKIPEDIA_ZIM_URL =
|
|
'https://github.com/Crosstalk-Solutions/project-nomad/raw/refs/heads/master/install/wikipedia_en_100_mini_2025-06.zim'
|
|
const filename = 'wikipedia_en_100_mini_2025-06.zim'
|
|
const filepath = join(process.cwd(), ZIM_STORAGE_PATH, filename)
|
|
logger.info(`[DockerService] Kiwix Serve pre-install: Downloading ZIM file to ${filepath}`)
|
|
|
|
this._broadcast(
|
|
DockerService.KIWIX_SERVICE_NAME,
|
|
'preinstall',
|
|
`Running pre-install actions for Kiwix Serve...`
|
|
)
|
|
this._broadcast(
|
|
DockerService.KIWIX_SERVICE_NAME,
|
|
'preinstall',
|
|
`Downloading Wikipedia ZIM file from ${WIKIPEDIA_ZIM_URL}. This may take some time...`
|
|
)
|
|
|
|
try {
|
|
await doResumableDownloadWithRetry({
|
|
url: WIKIPEDIA_ZIM_URL,
|
|
filepath,
|
|
timeout: 60000,
|
|
allowedMimeTypes: [
|
|
'application/x-zim',
|
|
'application/x-openzim',
|
|
'application/octet-stream',
|
|
],
|
|
})
|
|
|
|
this._broadcast(
|
|
DockerService.KIWIX_SERVICE_NAME,
|
|
'preinstall',
|
|
`Downloaded Wikipedia ZIM file to ${filepath}`
|
|
)
|
|
} catch (error) {
|
|
this._broadcast(
|
|
DockerService.KIWIX_SERVICE_NAME,
|
|
'preinstall-error',
|
|
`Failed to download Wikipedia ZIM file: ${error.message}`
|
|
)
|
|
throw new Error(`Pre-install action failed: ${error.message}`)
|
|
}
|
|
}
|
|
|
|
private async _cleanupFailedInstallation(serviceName: string): Promise<void> {
|
|
try {
|
|
const service = await Service.query().where('service_name', serviceName).first()
|
|
if (service) {
|
|
service.installation_status = 'error'
|
|
await service.save()
|
|
}
|
|
this.activeInstallations.delete(serviceName)
|
|
logger.info(`[DockerService] Cleaned up failed installation for ${serviceName}`)
|
|
} catch (error) {
|
|
logger.error(
|
|
`[DockerService] Failed to cleanup installation for ${serviceName}: ${error.message}`
|
|
)
|
|
}
|
|
}
|
|
|
|
private _broadcast(service: string, status: string, message: string) {
|
|
transmit.broadcast('service-installation', {
|
|
service_name: service,
|
|
timestamp: new Date().toISOString(),
|
|
status,
|
|
message,
|
|
})
|
|
logger.info(`[DockerService] [${service}] ${status}: ${message}`)
|
|
}
|
|
|
|
private _parseContainerConfig(containerConfig: any): any {
|
|
if (!containerConfig) {
|
|
return {}
|
|
}
|
|
|
|
try {
|
|
// Handle the case where containerConfig is returned as an object by DB instead of a string
|
|
let toParse = containerConfig
|
|
if (typeof containerConfig === 'object') {
|
|
toParse = JSON.stringify(containerConfig)
|
|
}
|
|
|
|
return JSON.parse(toParse)
|
|
} catch (error) {
|
|
logger.error(`Failed to parse container configuration: ${error.message}`)
|
|
throw new Error(`Invalid container configuration: ${error.message}`)
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Check if a Docker image exists locally.
|
|
* @param imageName - The name and tag of the image (e.g., "nginx:latest")
|
|
* @returns - True if the image exists locally, false otherwise
|
|
*/
|
|
private async _checkImageExists(imageName: string): Promise<boolean> {
|
|
try {
|
|
const images = await this.docker.listImages()
|
|
|
|
// Check if any image has a RepoTag that matches the requested image
|
|
return images.some((image) => image.RepoTags && image.RepoTags.includes(imageName))
|
|
} catch (error) {
|
|
logger.warn(`Error checking if image exists: ${error.message}`)
|
|
// If run into an error, assume the image does not exist
|
|
return false
|
|
}
|
|
}
|
|
}
|