78 lines
1.6 KiB
Go
78 lines
1.6 KiB
Go
package models
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import (
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"encoding/json"
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"io/ioutil"
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"log"
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"sync"
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"time"
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"github.com/FreifunkBremen/respond-collector/data"
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)
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// Alias a change request for other nodes
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type Alias struct {
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Hostname string `json:"hostname,omitempty"`
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Location *data.Location `json:"location,omitempty"`
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Wireless *data.Wireless `json:"wireless,omitempty"`
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Owner string `json:"owner,omitempty"`
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}
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// Aliases struct: cache DB of Node's structs
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type Aliases struct {
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List map[string]*Alias `json:"nodes"` // the current nodemap, indexed by node ID
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config *Config
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sync.Mutex
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}
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// NewAliases create Nodes structs
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func NewAliases(config *Config) *Aliases {
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aliases := &Aliases{
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List: make(map[string]*Alias),
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config: config,
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}
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if config.Nodes.AliasesPath != "" {
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aliases.load()
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}
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go aliases.worker()
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return aliases
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}
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// Update a alias in aliases cache
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func (e *Aliases) Update(nodeID string, newalias *Alias) {
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e.Lock()
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e.List[nodeID] = newalias
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e.Unlock()
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}
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func (e *Aliases) load() {
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path := e.config.Nodes.AliasesPath
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log.Println("loading", path)
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if data, err := ioutil.ReadFile(path); err == nil {
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if err = json.Unmarshal(data, e); err == nil {
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log.Println("loaded", len(e.List), "aliases")
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} else {
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log.Println("failed to unmarshal nodes:", err)
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}
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} else {
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log.Println("failed loading cached nodes:", err)
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}
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}
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// Periodically saves the cached DB to json file
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func (e *Aliases) worker() {
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c := time.Tick(time.Second * 5)
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for range c {
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log.Println("saving", len(e.List), "aliases")
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e.Lock()
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save(e, e.config.Nodes.AliasesPath)
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e.Unlock()
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}
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}
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