wings/server/server.go

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package server
import (
"context"
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"fmt"
"net/http"
"os"
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"strings"
"sync"
"emperror.dev/errors"
"github.com/apex/log"
"github.com/creasty/defaults"
"github.com/pterodactyl/wings/config"
"github.com/pterodactyl/wings/environment"
"github.com/pterodactyl/wings/environment/docker"
"github.com/pterodactyl/wings/events"
"github.com/pterodactyl/wings/remote"
"github.com/pterodactyl/wings/server/filesystem"
"github.com/pterodactyl/wings/system"
"golang.org/x/sync/semaphore"
)
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// Server is the high level definition for a server instance being controlled
// by Wings.
type Server struct {
// Internal mutex used to block actions that need to occur sequentially, such as
// writing the configuration to the disk.
sync.RWMutex
ctx context.Context
ctxCancel *context.CancelFunc
emitterLock sync.Mutex
powerLock *semaphore.Weighted
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throttleOnce sync.Once
// Maintains the configuration for the server. This is the data that gets returned by the Panel
// such as build settings and container images.
cfg Configuration
client remote.Client
// The crash handler for this server instance.
crasher CrashHandler
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resources ResourceUsage
Environment environment.ProcessEnvironment `json:"-"`
fs *filesystem.Filesystem
// Events emitted by the server instance.
emitter *events.EventBus
// Defines the process configuration for the server instance. This is dynamically
// fetched from the Pterodactyl Server instance each time the server process is
// started, and then cached here.
procConfig *remote.ProcessConfiguration
// Tracks the installation process for this server and prevents a server from running
// two installer processes at the same time. This also allows us to cancel a running
// installation process, for example when a server is deleted from the panel while the
// installer process is still running.
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installing *system.AtomicBool
transferring *system.AtomicBool
restoring *system.AtomicBool
// The console throttler instance used to control outputs.
throttler *ConsoleThrottler
// Tracks open websocket connections for the server.
wsBag *WebsocketBag
wsBagLocker sync.Mutex
}
// New returns a new server instance with a context and all of the default
// values set on the struct.
func New(client remote.Client) (*Server, error) {
ctx, cancel := context.WithCancel(context.Background())
s := Server{
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ctx: ctx,
ctxCancel: &cancel,
client: client,
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installing: system.NewAtomicBool(false),
transferring: system.NewAtomicBool(false),
restoring: system.NewAtomicBool(false),
}
if err := defaults.Set(&s); err != nil {
return nil, errors.Wrap(err, "server: could not set default values for struct")
}
if err := defaults.Set(&s.cfg); err != nil {
return nil, errors.Wrap(err, "server: could not set defaults for server configuration")
}
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s.resources.State = system.NewAtomicString(environment.ProcessOfflineState)
return &s, nil
}
// Id returns the UUID for the server instance.
func (s *Server) Id() string {
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return s.Config().GetUuid()
}
// Cancels the context assigned to this server instance. Assuming background tasks
// are using this server's context for things, all of the background tasks will be
// stopped as a result.
func (s *Server) CtxCancel() {
if s.ctxCancel != nil {
(*s.ctxCancel)()
}
}
// Returns a context instance for the server. This should be used to allow background
// tasks to be canceled if the server is removed. It will only be canceled when the
// application is stopped or if the server gets deleted.
func (s *Server) Context() context.Context {
return s.ctx
}
// Returns all of the environment variables that should be assigned to a running
// server instance.
func (s *Server) GetEnvironmentVariables() []string {
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out := []string{
fmt.Sprintf("TZ=%s", config.Get().System.Timezone),
fmt.Sprintf("STARTUP=%s", s.Config().Invocation),
fmt.Sprintf("SERVER_MEMORY=%d", s.MemoryLimit()),
fmt.Sprintf("SERVER_IP=%s", s.Config().Allocations.DefaultMapping.Ip),
fmt.Sprintf("SERVER_PORT=%d", s.Config().Allocations.DefaultMapping.Port),
}
eloop:
for k := range s.Config().EnvVars {
// Don't allow any environment variables that we have already set above.
for _, e := range out {
if strings.HasPrefix(e, strings.ToUpper(k) + "=") {
continue eloop
}
}
out = append(out, fmt.Sprintf("%s=%s", strings.ToUpper(k), s.Config().EnvVars.Get(k)))
}
return out
}
func (s *Server) Log() *log.Entry {
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return log.WithField("server", s.Id())
}
// Sync syncs the state of the server on the Panel with Wings. This ensures that
// we're always using the state of the server from the Panel and allows us to
// not require successful API calls to Wings to do things.
//
// This also means mass actions can be performed against servers on the Panel
// and they will automatically sync with Wings when the server is started.
func (s *Server) Sync() error {
cfg, err := s.client.GetServerConfiguration(s.Context(), s.Id())
if err != nil {
if err := remote.AsRequestError(err); err != nil && err.StatusCode() == http.StatusNotFound {
return &serverDoesNotExist{}
}
return errors.WithStackIf(err)
}
return s.SyncWithConfiguration(cfg)
}
func (s *Server) SyncWithConfiguration(cfg remote.ServerConfigurationResponse) error {
// Update the data structure and persist it to the disk.
if err := s.UpdateDataStructure(cfg.Settings); err != nil {
return err
}
s.Lock()
s.procConfig = cfg.ProcessConfiguration
s.Unlock()
// Update the disk space limits for the server whenever the configuration
// for it changes.
s.fs.SetDiskLimit(s.DiskSpace())
// If this is a Docker environment we need to sync the stop configuration with it so that
// the process isn't just terminated when a user requests it be stopped.
if e, ok := s.Environment.(*docker.Environment); ok {
s.Log().Debug("syncing stop configuration with configured docker environment")
e.SetImage(s.Config().Container.Image)
e.SetStopConfiguration(cfg.ProcessConfiguration.Stop)
}
return nil
}
// Reads the log file for a server up to a specified number of bytes.
func (s *Server) ReadLogfile(len int) ([]string, error) {
return s.Environment.Readlog(len)
}
// Determine if the server is bootable in it's current state or not. This will not
// indicate why a server is not bootable, only if it is.
func (s *Server) IsBootable() bool {
exists, _ := s.Environment.Exists()
return exists
}
// Initializes a server instance. This will run through and ensure that the environment
// for the server is setup, and that all of the necessary files are created.
func (s *Server) CreateEnvironment() error {
// Ensure the data directory exists before getting too far through this process.
if err := s.EnsureDataDirectoryExists(); err != nil {
return err
}
return s.Environment.Create()
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}
// Checks if the server is marked as being suspended or not on the system.
func (s *Server) IsSuspended() bool {
return s.Config().Suspended
}
func (s *Server) ProcessConfiguration() *remote.ProcessConfiguration {
s.RLock()
defer s.RUnlock()
return s.procConfig
}
// Filesystem returns an instance of the filesystem for this server.
func (s *Server) Filesystem() *filesystem.Filesystem {
return s.fs
}
// EnsureDataDirectoryExists ensures that the data directory for the server
// instance exists.
func (s *Server) EnsureDataDirectoryExists() error {
if _, err := os.Lstat(s.fs.Path()); err != nil {
if os.IsNotExist(err) {
s.Log().Debug("server: creating root directory and setting permissions")
if err := os.MkdirAll(s.fs.Path(), 0700); err != nil {
return errors.WithStack(err)
}
if err := s.fs.Chown("/"); err != nil {
s.Log().WithField("error", err).Warn("server: failed to chown server data directory")
}
} else {
return errors.WrapIf(err, "server: failed to stat server root directory")
}
}
return nil
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}
// Sets the state of the server internally. This function handles crash detection as
// well as reporting to event listeners for the server.
func (s *Server) OnStateChange() {
prevState := s.resources.State.Load()
st := s.Environment.State()
// Update the currently tracked state for the server.
s.resources.State.Store(st)
// Emit the event to any listeners that are currently registered.
if prevState != s.Environment.State() {
s.Log().WithField("status", st).Debug("saw server status change event")
s.Events().Publish(StatusEvent, st)
}
// Reset the resource usage to 0 when the process fully stops so that all of the UI
// views in the Panel correctly display 0.
if st == environment.ProcessOfflineState {
s.resources.Reset()
s.emitProcUsage()
}
// If server was in an online state, and is now in an offline state we should handle
// that as a crash event. In that scenario, check the last crash time, and the crash
// counter.
//
// In the event that we have passed the thresholds, don't do anything, otherwise
// automatically attempt to start the process back up for the user. This is done in a
// separate thread as to not block any actions currently taking place in the flow
// that called this function.
if (prevState == environment.ProcessStartingState || prevState == environment.ProcessRunningState) && s.Environment.State() == environment.ProcessOfflineState {
s.Log().Info("detected server as entering a crashed state; running crash handler")
go func(server *Server) {
if err := server.handleServerCrash(); err != nil {
if IsTooFrequentCrashError(err) {
server.Log().Info("did not restart server after crash; occurred too soon after the last")
} else {
s.PublishConsoleOutputFromDaemon("Server crash was detected but an error occurred while handling it.")
server.Log().WithField("error", err).Error("failed to handle server crash")
}
}
}(s)
}
}
// IsRunning determines if the server state is running or not. This is different
// than the environment state, it is simply the tracked state from this daemon
// instance, and not the response from Docker.
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func (s *Server) IsRunning() bool {
st := s.Environment.State()
return st == environment.ProcessRunningState || st == environment.ProcessStartingState
}
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// APIResponse is a type returned when requesting details about a single server
// instance on Wings. This includes the information needed by the Panel in order
// to show resource utilization and the current state on this system.
type APIResponse struct {
State string `json:"state"`
IsSuspended bool `json:"is_suspended"`
Utilization ResourceUsage `json:"utilization"`
Configuration Configuration `json:"configuration"`
}
// ToAPIResponse returns the server struct as an API object that can be consumed
// by callers.
func (s *Server) ToAPIResponse() APIResponse {
return APIResponse{
State: s.Environment.State(),
IsSuspended: s.IsSuspended(),
Utilization: s.Proc(),
Configuration: *s.Config(),
}
}