| 1 | // SPDX-License-Identifier: GPL-3.0-or-later |
| 2 | |
| 3 | package snmpsd |
| 4 | |
| 5 | import ( |
| 6 | "encoding/json" |
| 7 | "fmt" |
| 8 | "os" |
| 9 | "path/filepath" |
| 10 | "sync" |
| 11 | "sync/atomic" |
| 12 | "time" |
| 13 | |
| 14 | "github.com/netdata/netdata/go/plugins/plugin/go.d/pkg/snmputils" |
| 15 | ) |
| 16 | |
| 17 | func (d *Discoverer) loadFileStatus() { |
| 18 | d.status = newDiscoveryStatus() |
| 19 | |
| 20 | filename := statusFileName() |
| 21 | if filename == "" { |
| 22 | return |
| 23 | } |
| 24 | |
| 25 | f, err := os.Open(filename) |
| 26 | if err != nil { |
| 27 | d.Warningf("failed to open status file %s: %v", filename, err) |
| 28 | return |
| 29 | } |
| 30 | defer func() { _ = f.Close() }() |
| 31 | |
| 32 | if err := json.NewDecoder(f).Decode(d.status); err != nil { |
| 33 | d.Warningf("failed to parse status file %s: %v", filename, err) |
| 34 | return |
| 35 | } |
| 36 | |
| 37 | d.Infof("loaded status file: last discovery=%s", d.status.LastDiscoveryTime) |
| 38 | } |
| 39 | |
| 40 | func statusFileName() string { |
| 41 | v := os.Getenv("NETDATA_LIB_DIR") |
| 42 | if v == "" { |
| 43 | return "" |
| 44 | } |
| 45 | return filepath.Join(v, "god-sd-snmp-status.json") |
| 46 | } |
| 47 | |
| 48 | func newDiscoveryStatus() *discoveryStatus { |
| 49 | return &discoveryStatus{ |
| 50 | Networks: make(map[string]map[string]*discoveredDevice), |
| 51 | } |
| 52 | } |
| 53 | |
| 54 | type ( |
| 55 | discoveryStatus struct { |
| 56 | updated atomic.Bool |
| 57 | mux sync.RWMutex |
| 58 | Networks map[string]map[string]*discoveredDevice `json:"networks"` |
| 59 | LastDiscoveryTime time.Time `json:"last_discovery_time"` |
| 60 | ConfigHash uint64 `json:"config_hash"` |
| 61 | } |
| 62 | discoveredDevice struct { |
| 63 | DiscoverTime time.Time `json:"discover_time"` |
| 64 | SysInfo snmputils.SysInfo `json:"sysinfo"` |
| 65 | } |
| 66 | ) |
| 67 | |
| 68 | func (s *discoveryStatus) Bytes() ([]byte, error) { |
| 69 | s.mux.RLock() |
| 70 | defer s.mux.RUnlock() |
| 71 | |
| 72 | return json.MarshalIndent(s, "", " ") |
| 73 | } |
| 74 | |
| 75 | func (s *discoveryStatus) get(sub subnet, ip string) *discoveredDevice { |
| 76 | s.mux.RLock() |
| 77 | defer s.mux.RUnlock() |
| 78 | |
| 79 | devices, ok := s.Networks[subKey(sub)] |
| 80 | if !ok { |
| 81 | return nil |
| 82 | } |
| 83 | return devices[ip] |
| 84 | } |
| 85 | |
| 86 | func (s *discoveryStatus) put(sub subnet, ip string, dev *discoveredDevice) { |
| 87 | s.mux.Lock() |
| 88 | defer s.mux.Unlock() |
| 89 | |
| 90 | devices, ok := s.Networks[subKey(sub)] |
| 91 | if !ok { |
| 92 | devices = make(map[string]*discoveredDevice) |
| 93 | s.Networks[subKey(sub)] = devices |
| 94 | } |
| 95 | devices[ip] = dev |
| 96 | } |
| 97 | |
| 98 | func (s *discoveryStatus) del(sub subnet, ip string) { |
| 99 | s.mux.Lock() |
| 100 | defer s.mux.Unlock() |
| 101 | |
| 102 | if devices, ok := s.Networks[subKey(sub)]; ok { |
| 103 | delete(devices, ip) |
| 104 | } |
| 105 | } |
| 106 | |
| 107 | func subKey(s subnet) string { |
| 108 | return fmt.Sprintf("%s:%s", s.str, s.credential.Name) |
| 109 | } |