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package relay
import (
"encoding/base64"
"encoding/json"
"sort"
"sync"
"github.com/johnandersen777/socialweb-computer-kcp/internal/kit/opt"
)
type HostState string
const (
HostActive HostState = "active"
HostIdle HostState = "idle"
HostConnecting HostState = "connecting"
HostTakedown HostState = "takedown"
)
type HostInfo struct {
Hostname string `json:"hostname"`
DID string `json:"did"`
State HostState `json:"state"`
LastSeen int64 `json:"lastSeen"`
Cursor *int64 `json:"cursor"`
ConnectedAt *int64 `json:"connectedAt"`
RetryCount int `json:"retryCount"`
}
type AccountInfo struct {
DID string `json:"did"`
HostHostname string `json:"hostHostname"`
Rev *string `json:"rev"`
Seq *int64 `json:"seq"`
}
type Store interface {
ListHosts() []HostInfo
GetHost(hostname string) (HostInfo, bool)
PutHost(info HostInfo)
ListAccounts() []AccountInfo
GetAccount(did string) (AccountInfo, bool)
PutAccount(info AccountInfo)
AddCollection(collection, did string)
ListCollection(collection, cursor string, limit int) ([]string, string)
}
type MemoryStore struct {
mu sync.RWMutex
hosts map[string]HostInfo
accounts map[string]AccountInfo
collections map[string]map[string]struct{}
}
func NewMemoryStore() *MemoryStore {
return &MemoryStore{
hosts: map[string]HostInfo{},
accounts: map[string]AccountInfo{},
collections: map[string]map[string]struct{}{},
}
}
func (s *MemoryStore) ListHosts() []HostInfo {
s.mu.RLock()
defer s.mu.RUnlock()
out := make([]HostInfo, 0, len(s.hosts))
for _, h := range s.hosts {
out = append(out, h)
}
sort.Slice(out, func(i, j int) bool { return out[i].Hostname < out[j].Hostname })
return out
}
func (s *MemoryStore) GetHost(hostname string) (HostInfo, bool) {
s.mu.RLock()
defer s.mu.RUnlock()
h, ok := s.hosts[hostname]
return h, ok
}
func (s *MemoryStore) PutHost(info HostInfo) {
s.mu.Lock()
defer s.mu.Unlock()
s.hosts[info.Hostname] = info
}
func (s *MemoryStore) ListAccounts() []AccountInfo {
s.mu.RLock()
defer s.mu.RUnlock()
out := make([]AccountInfo, 0, len(s.accounts))
for _, a := range s.accounts {
out = append(out, a)
}
sort.Slice(out, func(i, j int) bool { return out[i].DID < out[j].DID })
return out
}
func (s *MemoryStore) GetAccount(did string) (AccountInfo, bool) {
s.mu.RLock()
defer s.mu.RUnlock()
a, ok := s.accounts[did]
return a, ok
}
func (s *MemoryStore) PutAccount(info AccountInfo) {
s.mu.Lock()
defer s.mu.Unlock()
s.accounts[info.DID] = info
}
func (s *MemoryStore) AddCollection(collection, did string) {
s.mu.Lock()
defer s.mu.Unlock()
set, ok := s.collections[collection]
if !ok {
set = map[string]struct{}{}
s.collections[collection] = set
}
set[did] = struct{}{}
}
func (s *MemoryStore) ListCollection(collection, cursor string, limit int) ([]string, string) {
s.mu.RLock()
all := make([]string, 0, len(s.collections[collection]))
for did := range s.collections[collection] {
all = append(all, did)
}
s.mu.RUnlock()
sort.Strings(all)
start := 0
if cursor != "" {
if last, ok := decodeCollectionCursor(cursor); ok {
start = sort.SearchStrings(all, last)
for start < len(all) && all[start] <= last {
start++
}
}
}
limit = opt.Positive(limit, 50)
end := min(start+limit, len(all))
page := append([]string{}, all[start:end]...)
next := ""
if end < len(all) && len(page) > 0 {
next = encodeCollectionCursor(collection, page[len(page)-1])
}
return page, next
}
func encodeCollectionCursor(collection, did string) string {
b, _ := json.Marshal([]string{"collection", collection, did})
return base64.StdEncoding.EncodeToString(b)
}
func decodeCollectionCursor(cursor string) (string, bool) {
b, err := base64.StdEncoding.DecodeString(cursor)
if err != nil {
return "", false
}
var key []string
if err := json.Unmarshal(b, &key); err != nil || len(key) != 3 {
return "", false
}
return key[2], true
}
