62 lines
2.1 KiB
Go
62 lines
2.1 KiB
Go
package server
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import (
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"encoding/json"
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"github.com/pterodactyl/wings/environment"
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"github.com/pterodactyl/wings/system"
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"sync"
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"sync/atomic"
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)
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// Defines the current resource usage for a given server instance. If a server is offline you
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// should obviously expect memory and CPU usage to be 0. However, disk will always be returned
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// since that is not dependent on the server being running to collect that data.
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type ResourceUsage struct {
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mu sync.RWMutex
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// Embed the current environment stats into this server specific resource usage struct.
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environment.Stats
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// The current server status.
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State *system.AtomicString `json:"state" default:"{}"`
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// The current disk space being used by the server. This value is not guaranteed to be accurate
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// at all times. It is "manually" set whenever server.Proc() is called. This is kind of just a
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// hacky solution for now to avoid passing events all over the place.
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Disk int64 `json:"disk_bytes"`
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}
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// Custom marshaler to ensure that the object is locked when we're converting it to JSON in
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// order to avoid race conditions.
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func (ru *ResourceUsage) MarshalJSON() ([]byte, error) {
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ru.mu.Lock()
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defer ru.mu.Unlock()
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// Alias the resource usage so that we don't infinitely recurse when marshaling the struct.
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type alias ResourceUsage
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return json.Marshal((*alias)(ru))
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}
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// Returns the resource usage stats for the server instance. If the server is not running, only the
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// disk space currently used will be returned. When the server is running all of the other stats will
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// be returned.
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//
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// When a process is stopped all of the stats are zeroed out except for the disk.
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func (s *Server) Proc() *ResourceUsage {
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// Store the updated disk usage when requesting process usage.
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atomic.StoreInt64(&s.resources.Disk, s.Filesystem().CachedUsage())
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// Acquire a lock before attempting to return the value of resources.
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s.resources.mu.RLock()
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defer s.resources.mu.RUnlock()
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return &s.resources
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}
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func (s *Server) emitProcUsage() {
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if err := s.Events().PublishJson(StatsEvent, s.Proc()); err != nil {
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s.Log().WithField("error", err).Warn("error while emitting server resource usage to listeners")
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}
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}
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