wings/server/loader.go

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package server
import (
"github.com/apex/log"
"github.com/creasty/defaults"
"github.com/patrickmn/go-cache"
"github.com/pkg/errors"
"github.com/pterodactyl/wings/api"
"github.com/remeh/sizedwaitgroup"
"os"
"time"
)
var servers = NewCollection(nil)
func GetServers() *Collection {
return servers
}
// Iterates over a given directory and loads all of the servers listed before returning
// them to the calling function.
func LoadDirectory() error {
if len(servers.items) != 0 {
return errors.New("cannot call LoadDirectory with a non-nil collection")
}
// We could theoretically use a standard wait group here, however doing
// that introduces the potential to crash the program due to too many
// open files. This wouldn't happen on a small setup, but once the daemon is
// handling many servers you run that risk.
//
// For now just process 10 files at a time, that should be plenty fast to
// read and parse the YAML. We should probably make this configurable down
// the road to help big instances scale better.
wg := sizedwaitgroup.New(10)
configs, rerr, err := api.NewRequester().GetAllServerConfigurations()
if err != nil || rerr != nil {
if err != nil {
return errors.WithStack(err)
}
return errors.New(rerr.String())
}
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log.Debug("retrieving cached server states from disk")
states, err := getServerStates()
if err != nil {
return errors.WithStack(err)
}
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log.WithField("total_configs", len(configs)).Debug("looping over received configurations from API")
for uuid, data := range configs {
wg.Add()
go func(uuid string, data *api.ServerConfigurationResponse) {
defer wg.Done()
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log.WithField("uuid", uuid).Debug("creating server object from configuration")
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s, err := FromConfiguration(data)
if err != nil {
log.WithField("server", uuid).WithField("error", err).Error("failed to load server, skipping...")
return
}
if state, exists := states[s.Id()]; exists {
s.SetState(state)
s.Log().WithField("state", s.GetState()).Debug("loaded server state from cache file")
}
servers.Add(s)
}(uuid, data)
}
// Wait until we've processed all of the configuration files in the directory
// before continuing.
wg.Wait()
return nil
}
// Initializes a server using a data byte array. This will be marshaled into the
// given struct using a YAML marshaler. This will also configure the given environment
// for a server.
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func FromConfiguration(data *api.ServerConfigurationResponse) (*Server, error) {
cfg := Configuration{}
if err := defaults.Set(&cfg); err != nil {
return nil, err
}
s := new(Server)
s.cfg = cfg
if err := s.UpdateDataStructure(data.Settings, false); err != nil {
return nil, err
}
s.AddEventListeners()
// Right now we only support a Docker based environment, so I'm going to hard code
// this logic in. When we're ready to support other environment we'll need to make
// some modifications here obviously.
if err := NewDockerEnvironment(s); err != nil {
return nil, err
}
s.cache = cache.New(time.Minute*10, time.Minute*15)
s.Archiver = Archiver{
Server: s,
}
s.Filesystem = Filesystem{
Server: s,
}
// If the server's data directory exists, force disk usage calculation.
if _, err := os.Stat(s.Filesystem.Path()); err == nil {
go s.Filesystem.HasSpaceAvailable()
}
// Forces the configuration to be synced with the panel.
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if err := s.SyncWithConfiguration(data); err != nil {
return nil, err
}
return s, nil
}