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package participant
import (
"context"
"log/slog"
"net"
"net/http"
"net/url"
"strings"
"time"
"github.com/johnandersen777/socialweb-computer-kcp/internal/atproto/xrpc"
)
const (
CrawlPeriod = 10 * time.Second
CrawlRefresh = 10 * time.Minute
crawlTimeout = 10 * time.Second
)
type crawlState struct {
announced string
at time.Time
public map[string]crawlState
}
type Crawl struct {
Relays []string
Address func() string
PublicRelays []string
PublicAddress func(ctx context.Context) string
Crawled func(ctx context.Context)
Period time.Duration
Log *slog.Logger
}
func (c Crawl) Run(ctx context.Context) {
log := c.Log
if log == nil {
log = slog.New(slog.DiscardHandler)
}
if (len(c.Relays) == 0 || c.Address == nil) && (len(c.PublicRelays) == 0 || c.PublicAddress == nil) {
log.Warn("the PDS is not registered with a relay", "relays", len(c.Relays), "publicRelays", len(c.PublicRelays))
return
}
state := &crawlState{public: map[string]crawlState{}}
if c.Period <= 0 {
c.once(ctx, log, state)
return
}
ticker := time.NewTicker(c.Period)
defer ticker.Stop()
for {
c.once(ctx, log, state)
select {
case <-ctx.Done():
return
case <-ticker.C:
}
}
}
func PublicCrawlHost(raw string) (string, bool) {
parsed, err := url.Parse(strings.TrimSpace(raw))
if err != nil || parsed.Scheme != "https" || parsed.Port() != "" || parsed.Path != "" && parsed.Path != "/" {
return "", false
}
host := strings.ToLower(parsed.Hostname())
if host == "" || net.ParseIP(host) != nil || !strings.Contains(host, ".") || host == "localhost" || strings.HasSuffix(host, ".localhost") ||
strings.HasSuffix(host, ".local") {
return "", false
}
return host, true
}
func (c Crawl) once(ctx context.Context, log *slog.Logger, state *crawlState) {
c.publicOnce(ctx, log, state)
if len(c.Relays) == 0 || c.Address == nil {
return
}
raw := strings.TrimSpace(c.Address())
if raw == "" {
return
}
parsed, err := url.Parse(raw)
if err != nil || parsed.Host == "" {
log.Warn("the PDS Exposure has no URL", "url", raw)
return
}
if state.announced == parsed.Host && time.Since(state.at) < CrawlRefresh {
return
}
registered := false
for _, relay := range c.Relays {
if xrpc.RequestCrawl(ctx, &xrpc.Client{Host: relay, HTTP: &http.Client{Timeout: crawlTimeout}}, parsed.Host) == nil {
registered = true
}
}
if !registered {
state.announced = ""
return
}
first := state.announced != parsed.Host
state.announced, state.at = parsed.Host, time.Now()
if first && c.Crawled != nil {
c.Crawled(ctx)
}
}
func (c Crawl) publicOnce(ctx context.Context, log *slog.Logger, state *crawlState) {
if len(c.PublicRelays) == 0 || c.PublicAddress == nil {
return
}
var due []string
for _, relay := range c.PublicRelays {
if last, ok := state.public[relay]; !ok || time.Since(last.at) >= CrawlRefresh {
due = append(due, relay)
}
}
if len(due) == 0 {
return
}
raw := strings.TrimSpace(c.PublicAddress(ctx))
if raw == "" {
return
}
host, ok := PublicCrawlHost(raw)
for _, relay := range due {
state.public[relay] = crawlState{announced: raw, at: time.Now()}
if !ok {
log.Info("participant_request_crawl_skipped", "relay", relay, "pds", raw, "reason", "not a public https host without a port")
continue
}
err := xrpc.RequestCrawl(ctx, &xrpc.Client{Host: relay, HTTP: &http.Client{Timeout: crawlTimeout}}, host)
if err != nil {
log.Warn("participant_request_crawl", "relay", relay, "hostname", host, "ok", false, "err", err)
continue
}
log.Info("participant_request_crawl", "relay", relay, "hostname", host, "ok", true)
}
}
