overleaf/services/clsi/app/js/DockerRunner.js

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const { promisify } = require('util')
const Settings = require('@overleaf/settings')
const logger = require('@overleaf/logger')
const Docker = require('dockerode')
const dockerode = new Docker()
const crypto = require('crypto')
const async = require('async')
const LockManager = require('./DockerLockManager')
const fs = require('fs')
const Path = require('path')
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const _ = require('lodash')
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const ONE_HOUR_IN_MS = 60 * 60 * 1000
logger.debug('using docker runner')
function usingSiblingContainers() {
return (
Settings != null &&
Settings.path != null &&
Settings.path.sandboxedCompilesHostDir != null
)
}
let containerMonitorTimeout
let containerMonitorInterval
const DockerRunner = {
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run(
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projectId,
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command,
directory,
image,
timeout,
environment,
compileGroup,
callback
) {
if (usingSiblingContainers()) {
const _newPath = Settings.path.sandboxedCompilesHostDir
logger.debug(
{ path: _newPath },
'altering bind path for sibling containers'
)
// Server Pro, example:
// '/var/lib/sharelatex/data/compiles/<project-id>'
// ... becomes ...
// '/opt/sharelatex_data/data/compiles/<project-id>'
directory = Path.join(
Settings.path.sandboxedCompilesHostDir,
Path.basename(directory)
)
}
const volumes = { [directory]: '/compile' }
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command = command.map(arg =>
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arg.toString().replace('$COMPILE_DIR', '/compile')
)
if (image == null) {
image = Settings.clsi.docker.image
}
if (
Settings.clsi.docker.allowedImages &&
!Settings.clsi.docker.allowedImages.includes(image)
) {
return callback(new Error('image not allowed'))
}
if (Settings.texliveImageNameOveride != null) {
const img = image.split('/')
image = `${Settings.texliveImageNameOveride}/${img[2]}`
}
const options = DockerRunner._getContainerOptions(
command,
image,
volumes,
timeout,
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environment,
compileGroup
)
const fingerprint = DockerRunner._fingerprintContainer(options)
const name = `project-${projectId}-${fingerprint}`
options.name = name
// logOptions = _.clone(options)
// logOptions?.HostConfig?.SecurityOpt = "secomp used, removed in logging"
logger.debug({ projectId }, 'running docker container')
DockerRunner._runAndWaitForContainer(
options,
volumes,
timeout,
(error, output) => {
if (error && error.statusCode === 500) {
logger.debug(
{ err: error, projectId },
'error running container so destroying and retrying'
)
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DockerRunner.destroyContainer(name, null, true, error => {
if (error != null) {
return callback(error)
}
DockerRunner._runAndWaitForContainer(
options,
volumes,
timeout,
callback
)
})
} else {
callback(error, output)
}
}
)
// pass back the container name to allow it to be killed
return name
},
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kill(containerId, callback) {
logger.debug({ containerId }, 'sending kill signal to container')
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const container = dockerode.getContainer(containerId)
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container.kill(error => {
if (
error != null &&
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error.message != null &&
error.message.match(/Cannot kill container .* is not running/)
) {
logger.warn(
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{ err: error, containerId },
'container not running, continuing'
)
error = null
}
if (error != null) {
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logger.error({ err: error, containerId }, 'error killing container')
callback(error)
} else {
callback()
}
})
},
_runAndWaitForContainer(options, volumes, timeout, _callback) {
const callback = _.once(_callback)
const { name } = options
let streamEnded = false
let containerReturned = false
let output = {}
function callbackIfFinished() {
if (streamEnded && containerReturned) {
callback(null, output)
}
}
function attachStreamHandler(error, _output) {
if (error != null) {
return callback(error)
}
output = _output
streamEnded = true
callbackIfFinished()
}
DockerRunner.startContainer(
options,
volumes,
attachStreamHandler,
(error, containerId) => {
if (error != null) {
return callback(error)
}
DockerRunner.waitForContainer(name, timeout, (error, exitCode) => {
if (error != null) {
return callback(error)
}
if (exitCode === 137) {
// exit status from kill -9
const err = new Error('terminated')
err.terminated = true
return callback(err)
}
if (exitCode === 1) {
// exit status from chktex
const err = new Error('exited')
err.code = exitCode
return callback(err)
}
containerReturned = true
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if (options != null && options.HostConfig != null) {
options.HostConfig.SecurityOpt = null
}
logger.debug({ exitCode, options }, 'docker container has exited')
callbackIfFinished()
})
}
)
},
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_getContainerOptions(
command,
image,
volumes,
timeout,
environment,
compileGroup
) {
const timeoutInSeconds = timeout / 1000
const dockerVolumes = {}
for (const hostVol in volumes) {
const dockerVol = volumes[hostVol]
dockerVolumes[dockerVol] = {}
if (volumes[hostVol].slice(-3).indexOf(':r') === -1) {
volumes[hostVol] = `${dockerVol}:rw`
}
}
// merge settings and environment parameter
const env = {}
for (const src of [Settings.clsi.docker.env, environment || {}]) {
for (const key in src) {
const value = src[key]
env[key] = value
}
}
// set the path based on the image year
const match = image.match(/:([0-9]+)\.[0-9]+/)
const year = match ? match[1] : '2014'
env.PATH = `/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/local/texlive/${year}/bin/x86_64-linux/`
const options = {
Cmd: command,
Image: image,
Volumes: dockerVolumes,
WorkingDir: '/compile',
NetworkDisabled: true,
Memory: 1024 * 1024 * 1024 * 1024, // 1 Gb
User: Settings.clsi.docker.user,
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Env: Object.entries(env).map(([key, value]) => `${key}=${value}`),
HostConfig: {
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Binds: Object.entries(volumes).map(
([hostVol, dockerVol]) => `${hostVol}:${dockerVol}`
),
LogConfig: { Type: 'none', Config: {} },
Ulimits: [
{
Name: 'cpu',
Soft: timeoutInSeconds + 5,
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Hard: timeoutInSeconds + 10,
},
],
CapDrop: 'ALL',
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SecurityOpt: ['no-new-privileges'],
},
}
if (Settings.clsi.docker.seccomp_profile != null) {
options.HostConfig.SecurityOpt.push(
`seccomp=${Settings.clsi.docker.seccomp_profile}`
)
}
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if (Settings.clsi.docker.apparmor_profile != null) {
options.HostConfig.SecurityOpt.push(
`apparmor=${Settings.clsi.docker.apparmor_profile}`
)
}
if (Settings.clsi.docker.runtime) {
options.HostConfig.Runtime = Settings.clsi.docker.runtime
}
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if (Settings.clsi.docker.Readonly) {
options.HostConfig.ReadonlyRootfs = true
options.HostConfig.Tmpfs = { '/tmp': 'rw,noexec,nosuid,size=65536k' }
options.Volumes['/home/tex'] = {}
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}
// Allow per-compile group overriding of individual settings
if (
Settings.clsi.docker.compileGroupConfig &&
Settings.clsi.docker.compileGroupConfig[compileGroup]
) {
const override = Settings.clsi.docker.compileGroupConfig[compileGroup]
for (const key in override) {
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_.set(options, key, override[key])
}
}
return options
},
_fingerprintContainer(containerOptions) {
// Yay, Hashing!
const json = JSON.stringify(containerOptions)
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return crypto.createHash('md5').update(json).digest('hex')
},
startContainer(options, volumes, attachStreamHandler, callback) {
LockManager.runWithLock(
options.name,
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releaseLock =>
// Check that volumes exist before starting the container.
// When a container is started with volume pointing to a
// non-existent directory then docker creates the directory but
// with root ownership.
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DockerRunner._checkVolumes(options, volumes, err => {
if (err != null) {
return releaseLock(err)
}
DockerRunner._startContainer(
options,
volumes,
attachStreamHandler,
releaseLock
)
}),
callback
)
},
// Check that volumes exist and are directories
_checkVolumes(options, volumes, callback) {
if (usingSiblingContainers()) {
// Server Pro, with sibling-containers active, skip checks
return callback(null)
}
const checkVolume = (path, cb) =>
fs.stat(path, (err, stats) => {
if (err != null) {
return cb(err)
}
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if (!stats.isDirectory()) {
return cb(new Error('not a directory'))
}
cb()
})
const jobs = []
for (const vol in volumes) {
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jobs.push(cb => checkVolume(vol, cb))
}
async.series(jobs, callback)
},
_startContainer(options, volumes, attachStreamHandler, callback) {
callback = _.once(callback)
const { name } = options
logger.debug({ containerName: name }, 'starting container')
const container = dockerode.getContainer(name)
function createAndStartContainer() {
dockerode.createContainer(options, (error, container) => {
if (error != null) {
return callback(error)
}
startExistingContainer()
})
}
function startExistingContainer() {
DockerRunner.attachToContainer(
options.name,
attachStreamHandler,
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error => {
if (error != null) {
return callback(error)
}
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container.start(error => {
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if (error != null && error.statusCode !== 304) {
callback(error)
} else {
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// already running
callback()
}
})
}
)
}
container.inspect((error, stats) => {
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if (error != null && error.statusCode === 404) {
createAndStartContainer()
} else if (error != null) {
logger.err(
{ containerName: name, error },
'unable to inspect container to start'
)
callback(error)
} else {
startExistingContainer()
}
})
},
attachToContainer(containerId, attachStreamHandler, attachStartCallback) {
const container = dockerode.getContainer(containerId)
container.attach({ stdout: 1, stderr: 1, stream: 1 }, (error, stream) => {
if (error != null) {
logger.error(
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{ err: error, containerId },
'error attaching to container'
)
return attachStartCallback(error)
} else {
attachStartCallback()
}
logger.debug({ containerId }, 'attached to container')
const MAX_OUTPUT = 1024 * 1024 * 2 // limit output to 2MB
function createStringOutputStream(name) {
return {
data: '',
overflowed: false,
write(data) {
if (this.overflowed) {
return
}
if (this.data.length < MAX_OUTPUT) {
this.data += data
} else {
logger.info(
{
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containerId,
length: this.data.length,
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maxLen: MAX_OUTPUT,
},
`${name} exceeds max size`
)
this.data += `(...truncated at ${MAX_OUTPUT} chars...)`
this.overflowed = true
}
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},
// kill container if too much output
// docker.containers.kill(containerId, () ->)
}
}
const stdout = createStringOutputStream('stdout')
const stderr = createStringOutputStream('stderr')
container.modem.demuxStream(stream, stdout, stderr)
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stream.on('error', err =>
logger.error(
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{ err, containerId },
'error reading from container stream'
)
)
stream.on('end', () =>
attachStreamHandler(null, { stdout: stdout.data, stderr: stderr.data })
)
})
},
waitForContainer(containerId, timeout, _callback) {
const callback = _.once(_callback)
const container = dockerode.getContainer(containerId)
let timedOut = false
const timeoutId = setTimeout(() => {
timedOut = true
logger.debug({ containerId }, 'timeout reached, killing container')
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container.kill(err => {
logger.warn({ err, containerId }, 'failed to kill container')
})
}, timeout)
logger.debug({ containerId }, 'waiting for docker container')
container.wait((error, res) => {
if (error != null) {
clearTimeout(timeoutId)
logger.warn({ err: error, containerId }, 'error waiting for container')
return callback(error)
}
if (timedOut) {
logger.debug({ containerId }, 'docker container timed out')
error = new Error('container timed out')
error.timedout = true
callback(error)
} else {
clearTimeout(timeoutId)
logger.debug(
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{ containerId, exitCode: res.StatusCode },
'docker container returned'
)
callback(null, res.StatusCode)
}
})
},
destroyContainer(containerName, containerId, shouldForce, callback) {
// We want the containerName for the lock and, ideally, the
// containerId to delete. There is a bug in the docker.io module
// where if you delete by name and there is an error, it throws an
// async exception, but if you delete by id it just does a normal
// error callback. We fall back to deleting by name if no id is
// supplied.
LockManager.runWithLock(
containerName,
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releaseLock =>
DockerRunner._destroyContainer(
containerId || containerName,
shouldForce,
releaseLock
),
callback
)
},
_destroyContainer(containerId, shouldForce, callback) {
logger.debug({ containerId }, 'destroying docker container')
const container = dockerode.getContainer(containerId)
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container.remove({ force: shouldForce === true, v: true }, error => {
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if (error != null && error.statusCode === 404) {
logger.warn(
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{ err: error, containerId },
'container not found, continuing'
)
error = null
}
if (error != null) {
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logger.error({ err: error, containerId }, 'error destroying container')
} else {
logger.debug({ containerId }, 'destroyed container')
}
callback(error)
})
},
// handle expiry of docker containers
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MAX_CONTAINER_AGE: Settings.clsi.docker.maxContainerAge || ONE_HOUR_IN_MS,
examineOldContainer(container, callback) {
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const name = container.Name || (container.Names && container.Names[0])
const created = container.Created * 1000 // creation time is returned in seconds
const now = Date.now()
const age = now - created
const maxAge = DockerRunner.MAX_CONTAINER_AGE
const ttl = maxAge - age
logger.debug(
{ containerName: name, created, now, age, maxAge, ttl },
'checking whether to destroy container'
)
return { name, id: container.Id, ttl }
},
destroyOldContainers(callback) {
dockerode.listContainers({ all: true }, (error, containers) => {
if (error != null) {
return callback(error)
}
const jobs = []
for (const container of containers) {
const { name, id, ttl } = DockerRunner.examineOldContainer(container)
if (name.slice(0, 9) === '/project-' && ttl <= 0) {
// strip the / prefix
// the LockManager uses the plain container name
const plainName = name.slice(1)
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jobs.push(cb =>
DockerRunner.destroyContainer(plainName, id, false, () => cb())
)
}
}
// Ignore errors because some containers get stuck but
// will be destroyed next time
async.series(jobs, callback)
})
},
startContainerMonitor() {
logger.debug(
{ maxAge: DockerRunner.MAX_CONTAINER_AGE },
'starting container expiry'
)
// guarantee only one monitor is running
DockerRunner.stopContainerMonitor()
// randomise the start time
const randomDelay = Math.floor(Math.random() * 5 * 60 * 1000)
containerMonitorTimeout = setTimeout(() => {
containerMonitorInterval = setInterval(
() =>
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DockerRunner.destroyOldContainers(err => {
if (err) {
logger.error({ err }, 'failed to destroy old containers')
}
}),
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ONE_HOUR_IN_MS
)
}, randomDelay)
},
stopContainerMonitor() {
if (containerMonitorTimeout) {
clearTimeout(containerMonitorTimeout)
containerMonitorTimeout = undefined
}
if (containerMonitorInterval) {
clearInterval(containerMonitorInterval)
containerMonitorInterval = undefined
}
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},
}
DockerRunner.startContainerMonitor()
module.exports = DockerRunner
module.exports.promises = {
run: promisify(DockerRunner.run),
kill: promisify(DockerRunner.kill),
}