Add GoReportcard badge (#57)

Adds GoReportcard Badge

.github/workflows/build-test.yml

@@ -14,10 +14,10 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-go@v2
         with:
-          go-version: '^1.15'
+          go-version: '1.15.2'
       
       - name: Build
-        run: GOOS=linux GOARCH=amd64 go build -ldflags="-s -w" -ldflags "-X github.com/pterodactyl/wings/system.Version=dev-${GIT_COMMIT:0:7}" -o build/wings_linux_amd64 -v wings.go
+        run: GOOS=linux GOARCH=amd64 go build -ldflags="-s -w -X github.com/pterodactyl/wings/system.Version=dev-${GIT_COMMIT:0:7}" -o build/wings_linux_amd64 -v wings.go
       
       - name: Test
         run: go test ./...

.github/workflows/release.yml

@@ -12,12 +12,12 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-go@v2
         with:
-          go-version: '^1.15'
+          go-version: '1.15.2'
       
       - name: Build
         env:
           REF: ${{ github.ref }}
-        run: GOOS=linux GOARCH=amd64 go build -ldflags="-s -w" -ldflags "-X github.com/pterodactyl/wings/system.Version=${REF:11}" -o build/wings_linux_amd64 -v wings.go
+        run: GOOS=linux GOARCH=amd64 go build -ldflags="-s -w -X github.com/pterodactyl/wings/system.Version=${REF:11}" -o build/wings_linux_amd64 -v wings.go
       
       - name: Test
         run: go test ./...

Dockerfile

@@ -2,7 +2,7 @@
 # Pterodactyl Panel Dockerfile
 # ----------------------------------
 
-FROM golang:1.14-alpine
+FROM golang:1.15-alpine
 COPY . /go/wings/
 WORKDIR /go/wings/
 RUN apk add --no-cache upx \
@@ -11,4 +11,4 @@ RUN apk add --no-cache upx \
 
 FROM alpine:latest
 COPY --from=0 /go/wings/wings /usr/bin/
-CMD ["wings","--config", "/var/lib/pterodactyl/config.yml"]
+CMD ["wings","--config", "/etc/pterodactyl/config.yml"]

README.md

@@ -1,6 +1,7 @@
 [![Logo Image](https://cdn.pterodactyl.io/logos/new/pterodactyl_logo.png)](https://pterodactyl.io)
 
 [![Discord](https://img.shields.io/discord/122900397965705216.svg?style=flat-square&label=Discord)](https://pterodactyl.io/discord)
+[![Go Report Card](https://goreportcard.com/badge/github.com/pterodactyl/wings)](https://goreportcard.com/report/github.com/pterodactyl/wings)
 
 # Pterodactyl Wings
 Wings is Pterodactyl's server control plane, built for the rapidly changing gaming industry and designed to be

api/api.go

@@ -137,14 +137,15 @@ func IsRequestError(err error) bool {
 }
 
 type RequestError struct {
-	Code   string `json:"code"`
+	response *http.Response
-	Status string `json:"status"`
+	Code     string `json:"code"`
-	Detail string `json:"detail"`
+	Status   string `json:"status"`
+	Detail   string `json:"detail"`
 }
 
 // Returns the error response in a string form that can be more easily consumed.
 func (re *RequestError) Error() string {
-	return fmt.Sprintf("Error response from Panel: %s: %s (HTTP/%s)", re.Code, re.Detail, re.Status)
+	return fmt.Sprintf("Error response from Panel: %s: %s (HTTP/%d)", re.Code, re.Detail, re.response.StatusCode)
 }
 
 func (re *RequestError) String() string {
@@ -165,9 +166,12 @@ func (r *PanelRequest) Error() *RequestError {
 	bag := RequestErrorBag{}
 	json.Unmarshal(body, &bag)
 
-	if len(bag.Errors) == 0 {
+	e := new(RequestError)
-		return new(RequestError)
+	if len(bag.Errors) > 0 {
+		e = &bag.Errors[0]
 	}
 
-	return &bag.Errors[0]
+	e.response = r.Response
+
+	return e
 }

api/sftp_endpoints.go

@@ -68,6 +68,12 @@ func (r *PanelRequest) ValidateSftpCredentials(request SftpAuthRequest) (*SftpAu
 
 	if r.HasError() {
 		if r.HttpResponseCode() >= 400 && r.HttpResponseCode() < 500 {
+			log.WithFields(log.Fields{
+				"subsystem": "sftp",
+				"username": request.User,
+				"ip": request.IP,
+			}).Warn(r.Error().String())
+
 			return nil, new(sftpInvalidCredentialsError)
 		}
 

cmd/root.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"github.com/NYTimes/logrotate"
 	"github.com/apex/log/handlers/multi"
+	"github.com/docker/docker/client"
 	"github.com/gammazero/workerpool"
 	"golang.org/x/crypto/acme"
 	"net/http"
@@ -172,6 +173,11 @@ func rootCmdRun(*cobra.Command, []string) {
 		log.WithField("server", s.Id()).Info("loaded configuration for server")
 	}
 
+	states, err := server.CachedServerStates()
+	if err != nil {
+		log.WithField("error", errors.WithStack(err)).Error("failed to retrieve locally cached server states from disk, assuming all servers in offline state")
+	}
+
 	// Create a new workerpool that limits us to 4 servers being bootstrapped at a time
 	// on Wings. This allows us to ensure the environment exists, write configurations,
 	// and reboot processes without causing a slow-down due to sequential booting.
@@ -181,25 +187,39 @@ func rootCmdRun(*cobra.Command, []string) {
 		s := serv
 
 		pool.Submit(func() {
-			s.Log().Info("ensuring server environment exists")
+			s.Log().Info("configuring server environment and restoring to previous state")
-			// Create a server environment if none exists currently. This allows us to recover from Docker
+
-			// being reinstalled on the host system for example.
+			var st string
-			if err := s.Environment.Create(); err != nil {
+			if state, exists := states[s.Id()]; exists {
-				s.Log().WithField("error", err).Error("failed to process environment")
+				st = state
 			}
 
 			r, err := s.Environment.IsRunning()
-			if err != nil {
+			// We ignore missing containers because we don't want to actually block booting of wings at this
+			// point. If we didn't do this and you pruned all of the images and then started wings you could
+			// end up waiting a long period of time for all of the images to be re-pulled on Wings boot rather
+			// than when the server itself is started.
+			if err != nil && !client.IsErrNotFound(err) {
 				s.Log().WithField("error", err).Error("error checking server environment status")
 			}
 
-			// If the server is currently running on Docker, mark the process as being in that state.
+			// Check if the server was previously running. If so, attempt to start the server now so that Wings
-			// We never want to stop an instance that is currently running external from Wings since
+			// can pick up where it left off. If the environment does not exist at all, just create it and then allow
-			// that is a good way of keeping things running even if Wings gets in a very corrupted state.
+			// the normal flow to execute.
 			//
-			// This will also validate that a server process is running if the last tracked state we have
+			// This does mean that booting wings after a catastrophic machine crash and wiping out the Docker images
-			// is that it was running, but we see that the container process is not currently running.
+			// as a result will result in a slow boot.
-			if r || (!r && s.IsRunning()) {
+			if !r && (st == environment.ProcessRunningState || st == environment.ProcessStartingState) {
+				if err := s.HandlePowerAction(server.PowerActionStart); err != nil {
+					s.Log().WithField("error", errors.WithStack(err)).Warn("failed to return server to running state")
+				}
+			} else if r || (!r && s.IsRunning()) {
+				// If the server is currently running on Docker, mark the process as being in that state.
+				// We never want to stop an instance that is currently running external from Wings since
+				// that is a good way of keeping things running even if Wings gets in a very corrupted state.
+				//
+				// This will also validate that a server process is running if the last tracked state we have
+				// is that it was running, but we see that the container process is not currently running.
 				s.Log().Info("detected server is running, re-attaching to process...")
 
 				s.SetState(environment.ProcessRunningState)

config/config_system.go

@@ -36,6 +36,12 @@ type SystemConfiguration struct {
 		Gid int
 	}
 
+	// The amount of time in seconds that can elapse before a server's disk space calculation is
+	// considered stale and a re-check should occur. DANGER: setting this value too low can seriously
+	// impact system performance and cause massive I/O bottlenecks and high CPU usage for the Wings
+	// process.
+	DiskCheckInterval int64 `default:"150" yaml:"disk_check_interval"`
+
 	// Determines if Wings should detect a server that stops with a normal exit code of
 	// "0" as being crashed if the process stopped without any Wings interaction. E.g.
 	// the user did not press the stop button, but the process stopped cleanly.
@@ -129,7 +135,21 @@ func (sc *SystemConfiguration) EnableLogRotation() error {
 	}
 	defer f.Close()
 
-	t, err := template.ParseFiles("templates/logrotate.tpl")
+	t, err := template.New("logrotate").Parse(`
+{{.LogDirectory}}/wings.log {
+    size 10M
+    compress
+    delaycompress
+    dateext
+    maxage 7
+    missingok
+    notifempty
+    create 0640 {{.User.Uid}} {{.User.Gid}}
+    postrotate
+        killall -SIGHUP wings
+    endscript
+}`)
+
 	if err != nil {
 		return errors.WithStack(err)
 	}

config/config_throttles.go

@@ -4,20 +4,24 @@ type ConsoleThrottles struct {
 	// Whether or not the throttler is enabled for this instance.
 	Enabled bool `json:"enabled" yaml:"enabled" default:"true"`
 
-	// The total number of throttle activations that must accumulate before a server is
+	// The total number of lines that can be output in a given LineResetInterval period before
-	// forcibly stopped for violating these limits.
-	KillAtCount uint64 `json:"kill_at_count" yaml:"kill_at_count" default:"5"`
-
-	// The amount of time in milliseconds that a server process must go through without
-	// triggering an output warning before the throttle activation count begins decreasing.
-	// This time is measured in milliseconds.
-	Decay uint64 `json:"decay" yaml:"decay" default:"10000"`
-
-	// The total number of lines that can be output in a given CheckInterval period before
 	// a warning is triggered and counted against the server.
-	Lines uint64 `json:"lines" yaml:"lines" default:"1000"`
+	Lines uint64 `json:"lines" yaml:"lines" default:"2000"`
 
-	// The amount of time that must pass between intervals before the count is reset. This
+	// The total number of throttle activations that can accumulate before a server is considered
-	// value is in milliseconds.
+	// to be breaching and will be stopped. This value is decremented by one every DecayInterval.
-	CheckInterval uint64 `json:"check_interval" yaml:"check_interval" default:"100"`
+	MaximumTriggerCount uint64 `json:"maximum_trigger_count" yaml:"maximum_trigger_count" default:"5"`
+
+	// The amount of time after which the number of lines processed is reset to 0. This runs in
+	// a constant loop and is not affected by the current console output volumes. By default, this
+	// will reset the processed line count back to 0 every 100ms.
+	LineResetInterval uint64 `json:"line_reset_interval" yaml:"line_reset_interval" default:"100"`
+
+	// The amount of time in milliseconds that must pass without an output warning being triggered
+	// before a throttle activation is decremented.
+	DecayInterval uint64 `json:"decay_interval" yaml:"decay_interval" default:"10000"`
+
+	// The amount of time that a server is allowed to be stopping for before it is terminated
+	// forfully if it triggers output throttles.
+	StopGracePeriod uint `json:"stop_grace_period" yaml:"stop_grace_period" default:"15"`
 }

docker-compose.example.yml

@@ -1,26 +1,35 @@
-version: '3'
+version: '3.5'
 services:
   daemon:
     build: .
     restart: always
-    hostname: daemon
+    networks:
+      - daemon0
     ports:
       - "8080:8080"
       - "2022:2022"
     tty: true
     environment:
       - "DEBUG=false"
+      - "TZ=UTC" # change to the three letter timezone of your choosing
     volumes:
       - "/var/run/docker.sock:/var/run/docker.sock"
       - "/var/lib/docker/containers/:/var/lib/docker/containers/"
+      - "/etc/pterodactyl/:/etc/pterodactyl/"
       - "/var/lib/pterodactyl/:/var/lib/pterodactyl/"
-      - "/srv/daemon-data/:/srv/daemon-data/"
+      - "/var/log/pterodactyl/:/var/log/pterodactyl/"
       - "/tmp/pterodactyl/:/tmp/pterodactyl/"
-      - "/etc/timezone:/etc/timezone:ro"
+      ## you may need /srv/daemon-data if you are upgrading from an old daemon
+      ## - "/srv/daemon-data/:/srv/daemon-data/"
       ## Required for ssl if you user let's encrypt. uncomment to use.
       ## - "/etc/letsencrypt/:/etc/letsencrypt/"
+
 networks:
-  default:
+  daemon0:
+    name: daemon0
+    driver: bridge
     ipam:
       config:
-        - subnet: 172.21.0.0/16
+        - subnet: "172.21.0.0/16"
+    driver_opts:
+      com.docker.network.bridge.name: daemon0

environment/docker/container.go

@@ -3,6 +3,7 @@ package docker
 import (
 	"bufio"
 	"context"
+	"encoding/json"
 	"fmt"
 	"github.com/apex/log"
 	"github.com/docker/docker/api/types"
@@ -19,6 +20,11 @@ import (
 	"time"
 )
 
+type imagePullStatus struct {
+	Status   string `json:"status"`
+	Progress string `json:"progress"`
+}
+
 // Attaches to the docker container itself and ensures that we can pipe data in and out
 // of the process stream. This should not be used for reading console data as you *will*
 // miss important output at the beginning because of the time delay with attaching to the
@@ -148,7 +154,7 @@ func (e *Environment) Create() error {
 		// Convert 127.0.0.1 to the pterodactyl0 network interface if the environment is Docker
 		// so that the server operates as expected.
 		if v == "SERVER_IP=127.0.0.1" {
-			evs[i] = "SERVER_IP="+config.Get().Docker.Network.Interface
+			evs[i] = "SERVER_IP=" + config.Get().Docker.Network.Interface
 		}
 	}
 
@@ -307,6 +313,9 @@ func (e *Environment) followOutput() error {
 //
 // TODO: local images
 func (e *Environment) ensureImageExists(image string) error {
+	e.Events().Publish(environment.DockerImagePullStarted, "")
+	defer e.Events().Publish(environment.DockerImagePullCompleted, "")
+
 	// Give it up to 15 minutes to pull the image. I think this should cover 99.8% of cases where an
 	// image pull might fail. I can't imagine it will ever take more than 15 minutes to fully pull
 	// an image. Let me know when I am inevitably wrong here...
@@ -374,12 +383,18 @@ func (e *Environment) ensureImageExists(image string) error {
 	// is done being pulled, which is what we need.
 	scanner := bufio.NewScanner(out)
 	for scanner.Scan() {
-		continue
+		s := imagePullStatus{}
+		fmt.Println(scanner.Text())
+		if err := json.Unmarshal(scanner.Bytes(), &s); err == nil {
+			e.Events().Publish(environment.DockerImagePullStatus, s.Status+" "+s.Progress)
+		}
 	}
 
 	if err := scanner.Err(); err != nil {
 		return err
 	}
 
+	log.WithField("image", image).Debug("completed docker image pull")
+
 	return nil
 }

environment/docker/environment.go

@@ -176,3 +176,9 @@ func (e *Environment) SetStopConfiguration(c *api.ProcessStopConfiguration) {
 	e.meta.Stop = c
 	e.mu.Unlock()
 }
+
+func (e *Environment) SetImage(i string) {
+	e.mu.Lock()
+	e.meta.Image = i
+	e.mu.Unlock()
+}

environment/docker/power.go

@@ -183,13 +183,21 @@ func (e *Environment) WaitForStop(seconds uint, terminate bool) error {
 	case <-ctx.Done():
 		if ctxErr := ctx.Err(); ctxErr != nil {
 			if terminate {
-				return e.Terminate(os.Kill)
+				log.WithField("container_id", e.Id).Debug("server did not stop in time, executing process termination")
+
+				return errors.WithStack(e.Terminate(os.Kill))
 			}
 
 			return errors.WithStack(ctxErr)
 		}
 	case err := <-errChan:
 		if err != nil {
+			if terminate {
+				log.WithField("container_id", e.Id).WithField("error", errors.WithStack(err)).Warn("error while waiting for container stop, attempting process termination")
+
+				return errors.WithStack(e.Terminate(os.Kill))
+			}
+
 			return errors.WithStack(err)
 		}
 	case <-ok:

environment/environment.go

@@ -6,9 +6,12 @@ import (
 )
 
 const (
-	ConsoleOutputEvent = "console output"
+	ConsoleOutputEvent       = "console output"
-	StateChangeEvent   = "state change"
+	StateChangeEvent         = "state change"
-	ResourceEvent      = "resources"
+	ResourceEvent            = "resources"
+	DockerImagePullStarted   = "docker image pull started"
+	DockerImagePullStatus    = "docker image pull status"
+	DockerImagePullCompleted = "docker image pull completed"
 )
 
 const (

events/events.go

@@ -2,6 +2,8 @@ package events
 
 import (
 	"encoding/json"
+	"github.com/gammazero/workerpool"
+	"github.com/pkg/errors"
 	"strings"
 	"sync"
 )
@@ -12,14 +14,13 @@ type Event struct {
 }
 
 type EventBus struct {
-	sync.RWMutex
+	mu    sync.RWMutex
-
+	pools map[string]*CallbackPool
-	subscribers map[string]map[chan Event]struct{}
 }
 
 func New() *EventBus {
 	return &EventBus{
-		subscribers: make(map[string]map[chan Event]struct{}),
+		pools: make(map[string]*CallbackPool),
 	}
 }
 
@@ -39,25 +40,36 @@ func (e *EventBus) Publish(topic string, data string) {
 		}
 	}
 
+	e.mu.RLock()
+	defer e.mu.RUnlock()
+
 	// Acquire a read lock and loop over all of the channels registered for the topic. This
 	// avoids a panic crash if the process tries to unregister the channel while this routine
 	// is running.
-	go func() {
+	if cp, ok := e.pools[t]; ok {
-		e.RLock()
+		for _, callback := range cp.callbacks {
-		defer e.RUnlock()
+			c := *callback
-
+			evt := Event{Data: data, Topic: topic}
-		if ch, ok := e.subscribers[t]; ok {
+			// Using the workerpool with one worker allows us to execute events in a FIFO manner. Running
-			for channel := range ch {
+			// this using goroutines would cause things such as console output to just output in random order
-				channel <- Event{Data: data, Topic: topic}
+			// if more than one event is fired at the same time.
-			}
+			//
+			// However, the pool submission does not block the execution of this function itself, allowing
+			// us to call publish without blocking any of the other pathways.
+			//
+			// @see https://github.com/pterodactyl/panel/issues/2303
+			cp.pool.Submit(func() {
+				c(evt)
+			})
 		}
-	}()
+	}
 }
 
+// Publishes a JSON message to a given topic.
 func (e *EventBus) PublishJson(topic string, data interface{}) error {
 	b, err := json.Marshal(data)
 	if err != nil {
-		return err
+		return errors.WithStack(err)
 	}
 
 	e.Publish(topic, string(b))
@@ -65,41 +77,46 @@ func (e *EventBus) PublishJson(topic string, data interface{}) error {
 	return nil
 }
 
-// Subscribe to an emitter topic using a channel.
+// Register a callback function that will be executed each time one of the events using the topic
-func (e *EventBus) Subscribe(topic string, ch chan Event) {
+// name is called.
-	e.Lock()
+func (e *EventBus) On(topic string, callback *func(Event)) {
-	defer e.Unlock()
+	e.mu.Lock()
+	defer e.mu.Unlock()
 
-	if _, exists := e.subscribers[topic]; !exists {
+	// Check if this topic has been registered at least once for the event listener, and if
-		e.subscribers[topic] = make(map[chan Event]struct{})
+	// not create an empty struct for the topic.
+	if _, exists := e.pools[topic]; !exists {
+		e.pools[topic] = &CallbackPool{
+			callbacks: make([]*func(Event), 0),
+			pool:      workerpool.New(1),
+		}
 	}
 
-	// Only set the channel if there is not currently a matching one for this topic. This
+	// If this callback is not already registered as an event listener, go ahead and append
-	// avoids registering two identical listeners for the same topic and causing pain in
+	// it to the array of callbacks for this topic.
-	// the unsubscribe functionality as well.
+	e.pools[topic].Add(callback)
-	if _, exists := e.subscribers[topic][ch]; !exists {
+}
-		e.subscribers[topic][ch] = struct{}{}
+
+// Removes an event listener from the bus.
+func (e *EventBus) Off(topic string, callback *func(Event)) {
+	e.mu.Lock()
+	defer e.mu.Unlock()
+
+	if cp, ok := e.pools[topic]; ok {
+		cp.Remove(callback)
 	}
 }
 
-// Unsubscribe a channel from a given topic.
+// Removes all of the event listeners that have been registered for any topic. Also stops the worker
-func (e *EventBus) Unsubscribe(topic string, ch chan Event) {
+// pool to close that routine.
-	e.Lock()
+func (e *EventBus) Destroy() {
-	defer e.Unlock()
+	e.mu.Lock()
+	defer e.mu.Unlock()
 
-	if _, exists := e.subscribers[topic][ch]; exists {
+	// Stop every pool that exists for a given callback topic.
-		delete(e.subscribers[topic], ch)
+	for _, cp := range e.pools {
+		cp.pool.Stop()
 	}
-}
 
-// Removes all of the event listeners for the server. This is used when a server
+	e.pools = make(map[string]*CallbackPool)
-// is being deleted to avoid a bunch of de-reference errors cropping up. Obviously
-// should also check elsewhere and handle a server reference going nil, but this
-// won't hurt.
-func (e *EventBus) UnsubscribeAll() {
-	e.Lock()
-	defer e.Unlock()
-
-	// Reset the entire struct into an empty map.
-	e.subscribers = make(map[string]map[chan Event]struct{})
 }

events/pool.go

@@ -0,0 +1,49 @@
+package events
+
+import (
+	"github.com/gammazero/workerpool"
+	"reflect"
+)
+
+type CallbackPool struct {
+	callbacks []*func(Event)
+	pool      *workerpool.WorkerPool
+}
+
+// Pushes a new callback into the array of listeners for the pool.
+func (cp *CallbackPool) Add(callback *func(Event)) {
+	if cp.index(reflect.ValueOf(callback)) < 0 {
+		cp.callbacks = append(cp.callbacks, callback)
+	}
+}
+
+// Removes a callback from the array of registered callbacks if it exists.
+func (cp *CallbackPool) Remove(callback *func(Event)) {
+	i := cp.index(reflect.ValueOf(callback))
+
+	// If i < 0 it means there was no index found for the given callback, meaning it was
+	// never registered or was already unregistered from the listeners. Also double check
+	// that we didn't somehow escape the length of the topic callback (not sure how that
+	// would happen, but lets avoid a panic condition).
+	if i < 0 || i >= len(cp.callbacks) {
+		return
+	}
+
+	// We can assume that the topic still exists at this point since we acquire an exclusive
+	// lock on the process, and the "e.index" function cannot return a value >= 0 if there is
+	// no topic already existing.
+	cp.callbacks = append(cp.callbacks[:i], cp.callbacks[i+1:]...)
+}
+
+// Finds the index of a given callback in the topic by comparing all of the registered callback
+// pointers to the passed function. This function does not aquire a lock as it should only be called
+// within the confines of a function that has already acquired a lock for the duration of the lookup.
+func (cp *CallbackPool) index(v reflect.Value) int {
+	for i, handler := range cp.callbacks {
+		if reflect.ValueOf(handler).Pointer() == v.Pointer() {
+			return i
+		}
+	}
+
+	return -1
+}

installer/installer.go

@@ -2,16 +2,12 @@ package installer
 
 import (
 	"encoding/json"
-	"github.com/apex/log"
 	"github.com/asaskevich/govalidator"
 	"github.com/buger/jsonparser"
 	"github.com/pkg/errors"
 	"github.com/pterodactyl/wings/api"
-	"github.com/pterodactyl/wings/config"
 	"github.com/pterodactyl/wings/environment"
 	"github.com/pterodactyl/wings/server"
-	"os"
-	"path"
 )
 
 type Installer struct {
@@ -95,33 +91,6 @@ func (i *Installer) Server() *server.Server {
 	return i.server
 }
 
-// Executes the installer process, creating the server and running through the
-// associated installation process based on the parameters passed through for
-// the server instance.
-func (i *Installer) Execute() {
-	p := path.Join(config.Get().System.Data, i.Uuid())
-	l := log.WithFields(log.Fields{"server": i.Uuid(), "process": "installer"})
-
-	l.WithField("path", p).Debug("creating required server data directory")
-	if err := os.MkdirAll(p, 0755); err != nil {
-		l.WithFields(log.Fields{"path": p, "error": errors.WithStack(err)}).Error("failed to create server data directory")
-		return
-	}
-
-	if err := os.Chown(p, config.Get().System.User.Uid, config.Get().System.User.Gid); err != nil {
-		l.WithField("error", errors.WithStack(err)).Error("failed to chown server data directory")
-		return
-	}
-
-	l.Debug("creating required environment for server instance")
-	if err := i.server.Environment.Create(); err != nil {
-		l.WithField("error", err).Error("failed to create environment for server")
-		return
-	}
-
-	l.Info("successfully created environment for server during install process")
-}
-
 // Returns a string value from the JSON data provided.
 func getString(data []byte, key ...string) string {
 	value, _ := jsonparser.GetString(data, key...)

router/router_server.go

@@ -198,7 +198,8 @@ func deleteServer(c *gin.Context) {
 	}
 
 	// Unsubscribe all of the event listeners.
-	s.Events().UnsubscribeAll()
+	s.Events().Destroy()
+	s.Throttler().StopTimer()
 
 	// Destroy the environment; in Docker this will handle a running container and
 	// forcibly terminate it before removing the container, so we do not need to handle

router/router_server_files.go

@@ -339,10 +339,22 @@ func postServerDecompressFiles(c *gin.Context) {
 	}
 
 	if err := s.Filesystem.DecompressFile(data.RootPath, data.File); err != nil {
-		// Check if the file does not exist.
-		// NOTE: os.IsNotExist() does not work if the error is wrapped.
 		if errors.Is(err, os.ErrNotExist) {
-			c.Status(http.StatusNotFound)
+			c.AbortWithStatusJSON(http.StatusNotFound, gin.H{
+				"error": "The requested archive was not found.",
+			})
+			return
+		}
+
+		// If the file is busy for some reason just return a nicer error to the user since there is not
+		// much we specifically can do. They'll need to stop the running server process in order to overwrite
+		// a file like this.
+		if strings.Contains(err.Error(), "text file busy") {
+			s.Log().WithField("error", err).Warn("failed to decompress file due to busy text file")
+
+			c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{
+				"error": "One or more files this archive is attempting to overwrite are currently in use by another process. Please try again.",
+			})
 			return
 		}
 

router/router_system.go

@@ -57,7 +57,11 @@ func postCreateServer(c *gin.Context) {
 	// cycle. If there are any errors they will be logged and communicated back
 	// to the Panel where a reinstall may take place.
 	go func(i *installer.Installer) {
-		i.Execute()
+		err := i.Server().CreateEnvironment()
+		if err != nil {
+			i.Server().Log().WithField("error", err).Error("failed to create server environment during install process")
+			return
+		}
 
 		if err := i.Server().Install(false); err != nil {
 			log.WithFields(log.Fields{"server": i.Uuid(), "error": err}).Error("failed to run install process for server")

router/router_transfer.go

@@ -277,7 +277,10 @@ func postTransfer(c *gin.Context) {
 		server.GetServers().Add(i.Server())
 
 		// Create the server's environment (note this does not execute the install script)
-		i.Execute()
+		if err := i.Server().CreateEnvironment(); err != nil {
+			l.WithField("error", err).Error("failed to create server environment")
+			return
+		}
 
 		// Un-archive the archive. That sounds weird..
 		if err := archiver.NewTarGz().Unarchive(archivePath, i.Server().Filesystem.Path()); err != nil {

router/websocket/listeners.go

@@ -50,24 +50,26 @@ var e = []string{
 // Listens for different events happening on a server and sends them along
 // to the connected websocket.
 func (h *Handler) ListenForServerEvents(ctx context.Context) {
-	eventChannel := make(chan events.Event)
+	h.server.Log().Debug("listening for server events over websocket")
-	for _, event := range e {
+	callback := func(e events.Event) {
-		h.server.Events().Subscribe(event, eventChannel)
+		if err := h.SendJson(&Message{Event: e.Topic, Args: []string{e.Data}}); err != nil {
-	}
+			h.server.Log().WithField("error", err).Warn("error while sending server data over websocket")
-
-	for d := range eventChannel {
-		select {
-		case <-ctx.Done():
-			for _, event := range e {
-				h.server.Events().Unsubscribe(event, eventChannel)
-			}
-
-			close(eventChannel)
-		default:
-			_ = h.SendJson(&Message{
-				Event: d.Topic,
-				Args:  []string{d.Data},
-			})
 		}
 	}
+
+	// Subscribe to all of the events with the same callback that will push the data out over the
+	// websocket for the server.
+	for _, evt := range e {
+		h.server.Events().On(evt, &callback)
+	}
+
+	go func(ctx context.Context) {
+		select {
+		case <-ctx.Done():
+			// Once this context is stopped, de-register all of the listeners that have been registered.
+			for _, evt := range e {
+				h.server.Events().Off(evt, &callback)
+			}
+		}
+	}(ctx)
 }

router/websocket/message.go

@@ -12,12 +12,7 @@ const (
 )
 
 type Message struct {
-	// The event to perform. Should be one of the following that are supported:
+	// The event to perform.
-	//
-	// - status : Returns the server's power state.
-	// - logs : Returns the server log data at the time of the request.
-	// - power : Performs a power action against the server based the data.
-	// - command : Performs a command on a server using the data field.
 	Event string `json:"event"`
 
 	// The data to pass along, only used by power/command currently. Other requests

router/websocket/websocket.go

@@ -37,6 +37,19 @@ type Handler struct {
 	server     *server.Server
 }
 
+var (
+	ErrJwtNotPresent = errors.New("jwt: no jwt present")
+	ErrJwtNoConnectPerm = errors.New("jwt: missing connect permission")
+	ErrJwtUuidMismatch = errors.New("jwt: server uuid mismatch")
+)
+
+func IsJwtError(err error) bool {
+	return errors.Is(err, ErrJwtNotPresent) ||
+		errors.Is(err, ErrJwtNoConnectPerm) ||
+		errors.Is(err, ErrJwtUuidMismatch) ||
+		errors.Is(err, jwt.ErrExpValidation)
+}
+
 // Parses a JWT into a websocket token payload.
 func NewTokenPayload(token []byte) (*tokens.WebsocketPayload, error) {
 	payload := tokens.WebsocketPayload{}
@@ -92,9 +105,13 @@ func GetHandler(s *server.Server, w http.ResponseWriter, r *http.Request) (*Hand
 }
 
 func (h *Handler) SendJson(v *Message) error {
-	// Do not send JSON down the line if the JWT on the connection is not
+	// Do not send JSON down the line if the JWT on the connection is not valid!
-	// valid!
 	if err := h.TokenValid(); err != nil {
+		h.unsafeSendJson(Message{
+			Event: ErrorEvent,
+			Args:  []string{"could not authenticate client: " + err.Error()},
+		})
+
 		return nil
 	}
 
@@ -134,7 +151,7 @@ func (h *Handler) unsafeSendJson(v interface{}) error {
 func (h *Handler) TokenValid() error {
 	j := h.GetJwt()
 	if j == nil {
-		return errors.New("no jwt present")
+		return ErrJwtNotPresent
 	}
 
 	if err := jwt.ExpirationTimeValidator(time.Now())(&j.Payload); err != nil {
@@ -142,11 +159,11 @@ func (h *Handler) TokenValid() error {
 	}
 
 	if !j.HasPermission(PermissionConnect) {
-		return errors.New("jwt does not have connect permission")
+		return ErrJwtNoConnectPerm
 	}
 
 	if h.server.Id() != j.GetServerUuid() {
-		return errors.New("jwt server uuid mismatch")
+		return ErrJwtUuidMismatch
 	}
 
 	return nil
@@ -157,9 +174,10 @@ func (h *Handler) TokenValid() error {
 // error message, otherwise we just send back a standard error message.
 func (h *Handler) SendErrorJson(msg Message, err error, shouldLog ...bool) error {
 	j := h.GetJwt()
+	expected := errors.Is(err, server.ErrSuspended) || errors.Is(err, server.ErrIsRunning)
 
 	message := "an unexpected error was encountered while handling this request"
-	if server.IsSuspendedError(err) || (j != nil && j.HasPermission(PermissionReceiveErrors)) {
+	if expected || (j != nil && j.HasPermission(PermissionReceiveErrors)) {
 		message = err.Error()
 	}
 
@@ -169,7 +187,7 @@ func (h *Handler) SendErrorJson(msg Message, err error, shouldLog ...bool) error
 	wsm.Args = []string{m}
 
 	if len(shouldLog) == 0 || (len(shouldLog) == 1 && shouldLog[0] == true) {
-		if !server.IsSuspendedError(err) {
+		if !expected && !IsJwtError(err) {
 			h.server.Log().WithFields(log.Fields{"event": msg.Event, "error_identifier": u.String(), "error": err}).
 				Error("failed to handle websocket process; an error was encountered processing an event")
 		}
@@ -206,8 +224,6 @@ func (h *Handler) GetJwt() *tokens.WebsocketPayload {
 func (h *Handler) HandleInbound(m Message) error {
 	if m.Event != AuthenticationEvent {
 		if err := h.TokenValid(); err != nil {
-			log.WithField("message", err.Error()).Debug("jwt for server websocket is no longer valid")
-
 			h.unsafeSendJson(Message{
 				Event: ErrorEvent,
 				Args:  []string{"could not authenticate client: " + err.Error()},
@@ -313,7 +329,7 @@ func (h *Handler) HandleInbound(m Message) error {
 				return nil
 			}
 
-			logs, err := h.server.Environment.Readlog(1024 * 16)
+			logs, err := h.server.Environment.Readlog(100)
 			if err != nil {
 				return err
 			}

server/console.go

@@ -1,60 +1,111 @@
 package server
 
 import (
+	"context"
 	"fmt"
 	"github.com/mitchellh/colorstring"
+	"github.com/pkg/errors"
 	"github.com/pterodactyl/wings/config"
+	"github.com/pterodactyl/wings/system"
 	"sync"
 	"sync/atomic"
 	"time"
 )
 
+var ErrTooMuchConsoleData = errors.New("console is outputting too much data")
+
 type ConsoleThrottler struct {
-	sync.RWMutex
+	mu sync.Mutex
 	config.ConsoleThrottles
 
 	// The total number of activations that have occurred thus far.
 	activations uint64
 
+	// The total number of lines that have been sent since the last reset timer period.
+	count uint64
+
+	// Wether or not the console output is being throttled. It is up to calling code to
+	// determine what to do if it is.
+	isThrottled system.AtomicBool
+
 	// The total number of lines processed so far during the given time period.
-	lines uint64
+	timerCancel *context.CancelFunc
-
-	lastIntervalTime *time.Time
-	lastDecayTime    *time.Time
 }
 
-// Increments the number of activations for a server.
+// Resets the state of the throttler.
-func (ct *ConsoleThrottler) AddActivation() uint64 {
+func (ct *ConsoleThrottler) Reset() {
-	ct.Lock()
+	atomic.StoreUint64(&ct.count, 0)
-	defer ct.Unlock()
+	atomic.StoreUint64(&ct.activations, 0)
-
+	ct.isThrottled.Set(false)
-	ct.activations += 1
-
-	return ct.activations
 }
 
-// Decrements the number of activations for a server.
+// Triggers an activation for a server. You can also decrement the number of activations
-func (ct *ConsoleThrottler) RemoveActivation() uint64 {
+// by passing a negative number.
-	ct.Lock()
+func (ct *ConsoleThrottler) markActivation(increment bool) uint64 {
-	defer ct.Unlock()
+	if !increment {
+		if atomic.LoadUint64(&ct.activations) == 0 {
+			return 0
+		}
 
-	if ct.activations == 0 {
+		// This weird dohicky subtracts 1 from the activation count.
-		return 0
+		return atomic.AddUint64(&ct.activations, ^uint64(0))
 	}
 
-	ct.activations -= 1
+	return atomic.AddUint64(&ct.activations, 1)
-
-	return ct.activations
 }
 
-// Increment the total count of lines that we have processed so far.
+// Determines if the console is currently being throttled. Calls to this function can be used to
-func (ct *ConsoleThrottler) IncrementLineCount() uint64 {
+// determine if output should be funneled along to the websocket processes.
-	return atomic.AddUint64(&ct.lines, 1)
+func (ct *ConsoleThrottler) Throttled() bool {
+	return ct.isThrottled.Get()
 }
 
-// Reset the line count to zero.
+// Starts a timer that runs in a seperate thread and will continually decrement the lines processed
-func (ct *ConsoleThrottler) ResetLineCount() {
+// and number of activations, regardless of the current console message volume.
-	atomic.SwapUint64(&ct.lines, 0)
+func (ct *ConsoleThrottler) StartTimer() {
+	ctx, cancel := context.WithCancel(context.Background())
+
+	reset := time.NewTicker(time.Duration(int64(ct.LineResetInterval)) * time.Millisecond)
+	decay := time.NewTicker(time.Duration(int64(ct.DecayInterval)) * time.Millisecond)
+
+	go func() {
+		for {
+			select {
+			case <-ctx.Done():
+				reset.Stop()
+				return
+			case <-reset.C:
+				ct.isThrottled.Set(false)
+				atomic.StoreUint64(&ct.count, 0)
+			}
+		}
+	}()
+
+	go func() {
+		for {
+			select {
+			case <-ctx.Done():
+				decay.Stop()
+				return
+			case <-decay.C:
+				ct.markActivation(false)
+			}
+		}
+	}()
+
+	ct.timerCancel = &cancel
+}
+
+// Stops a running timer processes if one exists. This is only called when the server is deleted since
+// we want this to always be running. If there is no process currently running nothing will really happen.
+func (ct *ConsoleThrottler) StopTimer() {
+	ct.mu.Lock()
+	defer ct.mu.Unlock()
+	if ct.timerCancel != nil {
+		c := *ct.timerCancel
+		c()
+		ct.timerCancel = nil
+	}
 }
 
 // Handles output from a server's console. This code ensures that a server is not outputting
@@ -70,30 +121,41 @@ func (ct *ConsoleThrottler) ResetLineCount() {
 // data all at once. These values are all configurable via the wings configuration file, however the
 // defaults have been in the wild for almost two years at the time of this writing, so I feel quite
 // confident in them.
-func (ct *ConsoleThrottler) Handle() {
+//
+// This function returns an error if the server should be stopped due to violating throttle constraints
+// and a boolean value indicating if a throttle is being violated when it is checked.
+func (ct *ConsoleThrottler) Increment(onTrigger func()) error {
+	if !ct.Enabled {
+		return nil
+	}
 
+	// Increment the line count and if we have now output more lines than are allowed, trigger a throttle
+	// activation. Once the throttle is triggered and has passed the kill at value we will trigger a server
+	// stop automatically.
+	if atomic.AddUint64(&ct.count, 1) >= ct.Lines && !ct.Throttled() {
+		ct.isThrottled.Set(true)
+		if ct.markActivation(true) >= ct.MaximumTriggerCount {
+			return ErrTooMuchConsoleData
+		}
+
+		onTrigger()
+	}
+
+	return nil
 }
 
 // Returns the throttler instance for the server or creates a new one.
 func (s *Server) Throttler() *ConsoleThrottler {
-	s.throttleLock.RLock()
+	s.throttleLock.Lock()
+	defer s.throttleLock.Unlock()
 
 	if s.throttler == nil {
-		// Release the read lock so that we can acquire a normal lock on the process and
-		// make modifications to the throttler.
-		s.throttleLock.RUnlock()
-
-		s.throttleLock.Lock()
 		s.throttler = &ConsoleThrottler{
 			ConsoleThrottles: config.Get().Throttles,
 		}
-		s.throttleLock.Unlock()
-
-		return s.throttler
-	} else {
-		defer s.throttleLock.RUnlock()
-		return s.throttler
 	}
+
+	return s.throttler
 }
 
 // Sends output to the server console formatted to appear correctly as being sent

server/errors.go

@@ -1,17 +1,9 @@
 package server
 
-type suspendedError struct {
+import "github.com/pkg/errors"
-}
 
-func (e *suspendedError) Error() string {
+var ErrIsRunning = errors.New("server is running")
-	return "server is currently in a suspended state"
+var ErrSuspended = errors.New("server is currently in a suspended state")
-}
-
-func IsSuspendedError(err error) bool {
-	_, ok := err.(*suspendedError)
-
-	return ok
-}
 
 type crashTooFrequent struct {
 }

server/filesystem.go

@@ -29,6 +29,8 @@ import (
 // Error returned when there is a bad path provided to one of the FS calls.
 type PathResolutionError struct{}
 
+var ErrNotEnoughDiskSpace = errors.New("not enough disk space is available to perform this operation")
+
 // Returns the error response in a string form that can be more easily consumed.
 func (pre PathResolutionError) Error() string {
 	return "invalid path resolution"
@@ -257,7 +259,7 @@ func (fs *Filesystem) HasSpaceAvailable(allowStaleValue bool) bool {
 func (fs *Filesystem) DiskUsage(allowStaleValue bool) (int64, error) {
 	// Check if cache is expired.
 	fs.lookupTimeMu.RLock()
-	isValidInCache := fs.lastLookupTime.After(time.Now().Add(time.Second * -10))
+	isValidInCache := fs.lastLookupTime.After(time.Now().Add(time.Second * time.Duration(-1*config.Get().System.DiskCheckInterval)))
 	fs.lookupTimeMu.RUnlock()
 
 	if !isValidInCache {
@@ -400,9 +402,10 @@ func (fs *Filesystem) Writefile(p string, r io.Reader) error {
 		currentSize = stat.Size()
 	}
 
+	o := &fileOpener{}
 	// This will either create the file if it does not already exist, or open and
 	// truncate the existing file.
-	file, err := os.OpenFile(cleaned, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0644)
+	file, err := o.open(cleaned, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0644)
 	if err != nil {
 		return errors.WithStack(err)
 	}
@@ -782,6 +785,10 @@ func (fs *Filesystem) EnsureDataDirectory() error {
 		if err := os.MkdirAll(fs.Path(), 0700); err != nil {
 			return errors.WithStack(err)
 		}
+
+		if err := fs.Chown("/"); err != nil {
+			fs.Server.Log().WithField("error", err).Warn("failed to chown server data directory")
+		}
 	}
 
 	return nil
@@ -933,3 +940,29 @@ func (fs *Filesystem) handleWalkerError(err error, f os.FileInfo) error {
 
 	return nil
 }
+
+type fileOpener struct {
+	busy        uint
+}
+
+// Attempts to open a given file up to "attempts" number of times, using a backoff. If the file
+// cannot be opened because of a "text file busy" error, we will attempt until the number of attempts
+// has been exhaused, at which point we will abort with an error.
+func (fo *fileOpener) open(path string, flags int, perm os.FileMode) (*os.File, error) {
+	for {
+		f, err := os.OpenFile(path, flags, perm)
+
+		// If there is an error because the text file is busy, go ahead and sleep for a few
+		// hundred milliseconds and then try again up to three times before just returning the
+		// error back to the caller.
+		//
+		// Based on code from: https://github.com/golang/go/issues/22220#issuecomment-336458122
+		if err != nil && fo.busy < 3 && strings.Contains(err.Error(), "text file busy") {
+			time.Sleep(100 * time.Millisecond << fo.busy)
+			fo.busy++
+			continue
+		}
+
+		return f, err
+	}
+}

server/filesystem_unarchive.go

@@ -32,14 +32,17 @@ func (fs *Filesystem) SpaceAvailableForDecompression(dir string, file string) (b
 	dirSize, err := fs.DiskUsage(false)
 
 	var size int64
+	var max = fs.Server.DiskSpace() * 1000.0 * 1000.0
 	// Walk over the archive and figure out just how large the final output would be from unarchiving it.
-	archiver.Walk(source, func(f archiver.File) error {
+	err = archiver.Walk(source, func(f archiver.File) error {
-		atomic.AddInt64(&size, f.Size())
+		if atomic.AddInt64(&size, f.Size()) + dirSize > max {
+			return errors.WithStack(ErrNotEnoughDiskSpace)
+		}
 
 		return nil
 	})
 
-	return ((dirSize + size) / 1000.0 / 1000.0) <= fs.Server.DiskSpace(), errors.WithStack(err)
+	return err == nil, errors.WithStack(err)
 }
 
 // Decompress a file in a given directory by using the archiver tool to infer the file
@@ -80,6 +83,11 @@ func (fs *Filesystem) DecompressFile(dir string, file string) error {
 			return errors.New(fmt.Sprintf("could not parse underlying data source with type %s", reflect.TypeOf(s).String()))
 		}
 
-		return errors.Wrap(fs.Writefile(name, f), "could not extract file from archive")
+		p, err := fs.SafePath(filepath.Join(dir, name))
+		if err != nil {
+			return errors.Wrap(err, "failed to generate a safe path to server file")
+		}
+
+		return errors.Wrap(fs.Writefile(p, f), "could not extract file from archive")
 	})
 }

server/listeners.go

@@ -5,58 +5,104 @@ import (
 	"github.com/apex/log"
 	"github.com/pkg/errors"
 	"github.com/pterodactyl/wings/api"
+	"github.com/pterodactyl/wings/config"
 	"github.com/pterodactyl/wings/environment"
 	"github.com/pterodactyl/wings/events"
 	"regexp"
 	"strconv"
 )
 
-// Adds all of the internal event listeners we want to use for a server.
+var dockerEvents = []string{
+	environment.DockerImagePullStatus,
+	environment.DockerImagePullStarted,
+	environment.DockerImagePullCompleted,
+}
+
+// Adds all of the internal event listeners we want to use for a server. These listeners can only be
+// removed by deleting the server as they should last for the duration of the process' lifetime.
 func (s *Server) StartEventListeners() {
-	console := make(chan events.Event)
+	console := func(e events.Event) {
-	state := make(chan events.Event)
+		t := s.Throttler()
-	stats := make(chan events.Event)
+		err := t.Increment(func () {
+			s.PublishConsoleOutputFromDaemon("Your server is outputting too much data and is being throttled.")
+		})
 
-	s.Environment.Events().Subscribe(environment.ConsoleOutputEvent, console)
+		// An error is only returned if the server has breached the thresholds set.
-	s.Environment.Events().Subscribe(environment.StateChangeEvent, state)
+		if err != nil {
-	s.Environment.Events().Subscribe(environment.ResourceEvent, stats)
+			// If the process is already stopping, just let it continue with that action rather than attempting
+			// to terminate again.
+			if s.GetState() != environment.ProcessStoppingState {
+				s.SetState(environment.ProcessStoppingState)
+				go func() {
+					s.Log().Warn("stopping server instance, violating throttle limits")
+					s.PublishConsoleOutputFromDaemon("Your server is being stopped for outputting too much data in a short period of time.")
+					// Completely skip over server power actions and terminate the running instance. This gives the
+					// server 15 seconds to finish stopping gracefully before it is forcefully terminated.
+					if err := s.Environment.WaitForStop(config.Get().Throttles.StopGracePeriod, true); err != nil {
+						// If there is an error set the process back to running so that this throttler is called
+						// again and hopefully kills the server.
+						if s.GetState() != environment.ProcessOfflineState {
+							s.SetState(environment.ProcessRunningState)
+						}
 
-	go func(console chan events.Event) {
+						s.Log().WithField("error", errors.WithStack(err)).Error("failed to terminate environment after triggering throttle")
-		for data := range console {
+					}
-			// Immediately emit this event back over the server event stream since it is
+				}()
-			// being called from the environment event stream and things probably aren't
-			// listening to that event.
-			s.Events().Publish(ConsoleOutputEvent, data.Data)
-
-			// Also pass the data along to the console output channel.
-			s.onConsoleOutput(data.Data)
-		}
-	}(console)
-
-	go func(state chan events.Event) {
-		for data := range state {
-			s.SetState(data.Data)
-		}
-	}(state)
-
-	go func(stats chan events.Event) {
-		for data := range stats {
-			st := new(environment.Stats)
-			if err := json.Unmarshal([]byte(data.Data), st); err != nil {
-				s.Log().WithField("error", errors.WithStack(err)).Warn("failed to unmarshal server environment stats")
-				continue
 			}
-
-			// Update the server resource tracking object with the resources we got here.
-			s.resources.mu.Lock()
-			s.resources.Stats = *st
-			s.resources.mu.Unlock()
-
-			s.Filesystem.HasSpaceAvailable(true)
-
-			s.emitProcUsage()
 		}
-	}(stats)
+
+		// If we are not throttled, go ahead and output the data.
+		if !t.Throttled() {
+			s.Events().Publish(ConsoleOutputEvent, e.Data)
+		}
+
+		// Also pass the data along to the console output channel.
+		s.onConsoleOutput(e.Data)
+	}
+
+	state := func(e events.Event) {
+		// Reset the throttler when the process is started.
+		if e.Data == environment.ProcessStartingState {
+			s.Throttler().Reset()
+		}
+
+		s.SetState(e.Data)
+	}
+
+	stats := func(e events.Event) {
+		st := new(environment.Stats)
+		if err := json.Unmarshal([]byte(e.Data), st); err != nil {
+			s.Log().WithField("error", errors.WithStack(err)).Warn("failed to unmarshal server environment stats")
+			return
+		}
+
+		// Update the server resource tracking object with the resources we got here.
+		s.resources.mu.Lock()
+		s.resources.Stats = *st
+		s.resources.mu.Unlock()
+
+		s.Filesystem.HasSpaceAvailable(true)
+
+		s.emitProcUsage()
+	}
+
+	docker := func(e events.Event) {
+		if e.Topic == environment.DockerImagePullStatus {
+			s.Events().Publish(InstallOutputEvent, e.Data)
+		} else if e.Topic == environment.DockerImagePullStarted {
+			s.PublishConsoleOutputFromDaemon("Pulling Docker container image, this could take a few minutes to complete...")
+		} else {
+			s.PublishConsoleOutputFromDaemon("Finished pulling Docker container image")
+		}
+	}
+
+	s.Log().Info("registering event listeners: console, state, resources...")
+	s.Environment.Events().On(environment.ConsoleOutputEvent, &console)
+	s.Environment.Events().On(environment.StateChangeEvent, &state)
+	s.Environment.Events().On(environment.ResourceEvent, &stats)
+	for _, evt := range dockerEvents {
+		s.Environment.Events().On(evt, &docker)
+	}
 }
 
 var stripAnsiRegex = regexp.MustCompile("[\u001B\u009B][[\\]()#;?]*(?:(?:(?:[a-zA-Z\\d]*(?:;[a-zA-Z\\d]*)*)?\u0007)|(?:(?:\\d{1,4}(?:;\\d{0,4})*)?[\\dA-PRZcf-ntqry=><~]))")

server/loader.go

@@ -37,12 +37,6 @@ func LoadDirectory() error {
 		return errors.New(rerr.String())
 	}
 
-	log.Debug("retrieving cached server states from disk")
-	states, err := getServerStates()
-	if err != nil {
-		log.WithField("error", errors.WithStack(err)).Error("failed to retrieve locally cached server states from disk, assuming all servers in offline state")
-	}
-
 	start := time.Now()
 	log.WithField("total_configs", len(configs)).Info("processing servers returned by the API")
 
@@ -59,11 +53,6 @@ func LoadDirectory() error {
 				return
 			}
 
-			if state, exists := states[s.Id()]; exists {
-				s.Log().WithField("state", state).Debug("found existing server state in cache file; re-instantiating server state")
-				s.SetState(state)
-			}
-
 			servers.Add(s)
 		})
 	}
@@ -97,6 +86,9 @@ func FromConfiguration(data *api.ServerConfigurationResponse) (*Server, error) {
 		return nil, err
 	}
 
+	s.resources = ResourceUsage{}
+	defaults.Set(&s.resources)
+
 	s.Archiver = Archiver{Server: s}
 	s.Filesystem = Filesystem{Server: s}
 
@@ -118,7 +110,8 @@ func FromConfiguration(data *api.ServerConfigurationResponse) (*Server, error) {
 		return nil, err
 	} else {
 		s.Environment = env
-		go s.StartEventListeners()
+		s.StartEventListeners()
+		s.Throttler().StartTimer()
 	}
 
 	// Forces the configuration to be synced with the panel.

server/power.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"github.com/pkg/errors"
 	"github.com/pterodactyl/wings/config"
+	"github.com/pterodactyl/wings/environment"
 	"golang.org/x/sync/semaphore"
 	"os"
 	"time"
@@ -87,6 +88,10 @@ func (s *Server) HandlePowerAction(action PowerAction, waitSeconds ...int) error
 
 	switch action {
 	case PowerActionStart:
+		if s.GetState() != environment.ProcessOfflineState {
+			return ErrIsRunning
+		}
+
 		// Run the pre-boot logic for the server before processing the environment start.
 		if err := s.onBeforeStart(); err != nil {
 			return err
@@ -134,7 +139,7 @@ func (s *Server) onBeforeStart() error {
 	// Disallow start & restart if the server is suspended. Do this check after performing a sync
 	// action with the Panel to ensure that we have the most up-to-date information for that server.
 	if s.IsSuspended() {
-		return new(suspendedError)
+		return ErrSuspended
 	}
 
 	// Ensure we sync the server information with the environment so that any new environment variables

server/resources.go

@@ -1,7 +1,6 @@
 package server
 
 import (
-	"encoding/json"
 	"github.com/pterodactyl/wings/environment"
 	"sync"
 )
@@ -37,14 +36,10 @@ func (s *Server) Proc() *ResourceUsage {
 
 func (s *Server) emitProcUsage() {
 	s.resources.mu.RLock()
-	defer s.resources.mu.RUnlock()
+	if err := s.Events().PublishJson(StatsEvent, s.resources); err != nil {
-
+		s.Log().WithField("error", err).Warn("error while emitting server resource usage to listeners")
-	b, err := json.Marshal(s.resources)
-	if err == nil {
-		s.Events().Publish(StatsEvent, string(b))
 	}
-
+	s.resources.mu.RUnlock()
-	// TODO: This might be a good place to add a debug log if stats are not sending.
 }
 
 // Returns the servers current state.

server/server.go

@@ -22,7 +22,7 @@ type Server struct {
 	sync.RWMutex
 	emitterLock  sync.Mutex
 	powerLock    *semaphore.Weighted
-	throttleLock sync.RWMutex
+	throttleLock sync.Mutex
 
 	// Maintains the configuration for the server. This is the data that gets returned by the Panel
 	// such as build settings and container images.
@@ -137,6 +137,7 @@ func (s *Server) SyncWithConfiguration(cfg *api.ServerConfigurationResponse) err
 	// 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)
 	}
 

server/state.go

@@ -15,7 +15,7 @@ import (
 var stateMutex sync.Mutex
 
 // Returns the state of the servers.
-func getServerStates() (map[string]string, error) {
+func CachedServerStates() (map[string]string, error) {
 	// Request a lock after we check if the file exists.
 	stateMutex.Lock()
 	defer stateMutex.Unlock()
@@ -78,8 +78,8 @@ func (s *Server) SetState(state string) error {
 
 	// Emit the event to any listeners that are currently registered.
 	if prevState != state {
-		s.Log().WithField("status", s.Proc().State).Debug("saw server status change event")
+		s.Log().WithField("status", s.Proc().getInternalState()).Debug("saw server status change event")
-		s.Events().Publish(StatusEvent, s.Proc().State)
+		s.Events().Publish(StatusEvent, s.Proc().getInternalState())
 	}
 
 	// Persist this change to the disk immediately so that should the Daemon be stopped or

system/bool.go

@@ -0,0 +1,20 @@
+package system
+
+import "sync/atomic"
+
+type AtomicBool struct {
+	flag uint32
+}
+
+func (ab *AtomicBool) Set(v bool) {
+	i := 0
+	if v {
+		i = 1
+	}
+
+	atomic.StoreUint32(&ab.flag, uint32(i))
+}
+
+func (ab *AtomicBool) Get() bool {
+	return atomic.LoadUint32(&ab.flag) == 1
+}

templates/logrotate.tpl

@@ -1,13 +0,0 @@
-{{.LogDirectory}}/wings.log {
-    size 10M
-    compress
-    delaycompress
-    dateext
-    maxage 7
-    missingok
-    notifempty
-    create 0640 {{.User.Uid}} {{.User.Gid}}
-    postrotate
-        killall -SIGHUP wings
-    endscript
-}