88 lines
1.7 KiB
Go
88 lines
1.7 KiB
Go
package server
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import (
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"encoding/json"
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"github.com/pkg/errors"
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"io/ioutil"
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"os"
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"sync"
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)
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const stateFileLocation = "data/.states.json"
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var stateMutex sync.Mutex
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// Checks if the state tracking file exists, if not it is generated.
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func ensureStateFileExists() (bool, error) {
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stateMutex.Lock()
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defer stateMutex.Unlock()
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if _, err := os.Stat(stateFileLocation); err != nil {
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if !os.IsNotExist(err) {
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return false, errors.WithStack(err)
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}
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return false, nil
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}
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return true, nil
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}
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// Returns the state of the servers.
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func getServerStates() (map[string]string, error) {
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// Check if the states file exists.
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exists, err := ensureStateFileExists()
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if err != nil {
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return nil, errors.WithStack(err)
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}
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// Request a lock after we check if the file exists.
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stateMutex.Lock()
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defer stateMutex.Unlock()
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// Return an empty map if the file does not exist.
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if !exists {
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return map[string]string{}, nil
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}
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// Open the states file.
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f, err := os.Open(stateFileLocation)
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if err != nil {
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return nil, errors.WithStack(err)
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}
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defer f.Close()
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// Convert the json object to a map.
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states := map[string]string{}
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if err := json.NewDecoder(f).Decode(&states); err != nil {
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return nil, errors.WithStack(err)
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}
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return states, nil
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}
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// SaveServerStates .
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func SaveServerStates() error {
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// Get the states of all servers on the daemon.
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states := map[string]string{}
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for _, s := range GetServers().All() {
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states[s.Uuid] = s.State
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}
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// Convert the map to a json object.
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data, err := json.Marshal(states)
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if err != nil {
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return errors.WithStack(err)
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}
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stateMutex.Lock()
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defer stateMutex.Unlock()
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// Write the data to the file
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if err := ioutil.WriteFile(stateFileLocation, data, 0644); err != nil {
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return errors.WithStack(err)
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}
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return nil
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}
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