golib/net/ipgate/ipprefix.go
AJ ONeal dddfdd392c
feat(net/ipgate): IP allowlist/blocklist via PrefixSet and DomainSet
PrefixSet: git-backed CIDR files via gitshallow, refreshed every 47 min.
DomainSet: takes pre-parsed (staticPrefixes, domains []string); resolves
hostnames every 5 min, retaining stale IPs on failure. Both use
atomic-swapped ipcohort.Cohort for lock-free reads.

ParseDomainSet(RecordReader) parses rows into prefixes and hostnames;
caller constructs the record reader (e.g. csv.Reader with delimiter,
comment char). RecordReader interface is satisfied by *csv.Reader.

commaify uses plain string concat (integers max ~7 groups).
2026-05-22 12:23:35 -04:00

95 lines
1.9 KiB
Go

package ipgate
import (
"context"
"fmt"
"net/netip"
"os"
"sync/atomic"
"time"
"github.com/therootcompany/golib/net/gitshallow"
"github.com/therootcompany/golib/net/ipcohort"
)
const prefixSetRefreshInterval = 47 * time.Minute
type PrefixSet struct {
repo *gitshallow.Repo
files []string
cohort atomic.Pointer[ipcohort.Cohort]
}
func EmptyPrefixSet() *PrefixSet {
ps := &PrefixSet{}
ps.cohort.Store(&ipcohort.Cohort{})
return ps
}
func NewPrefixSet(ctx context.Context, repoURL, dataPath string, files []string) (*PrefixSet, error) {
if err := os.MkdirAll(dataPath, 0o755); err != nil {
return nil, fmt.Errorf("ipgate: create data dir: %w", err)
}
repo := gitshallow.New(repoURL, dataPath, 0, "")
ps := &PrefixSet{
repo: repo,
files: files,
}
ps.cohort.Store(&ipcohort.Cohort{})
go ps.refreshLoop(ctx)
return ps, nil
}
func (ps *PrefixSet) Contains(addr netip.Addr) bool {
return ps.cohort.Load().ContainsAddr(addr)
}
func (ps *PrefixSet) reload(ctx context.Context) error {
updated, err := ps.repo.Fetch(ctx)
if err != nil {
return err
}
if !updated && ps.cohort.Load().Size() > 0 {
return nil
}
paths := make([]string, len(ps.files))
for i, f := range ps.files {
paths[i] = ps.repo.FilePath(f)
}
cohort, err := ipcohort.LoadFiles(paths...)
if err != nil {
return fmt.Errorf("load files: %w", err)
}
ps.cohort.Store(cohort)
log().Info("prefix set loaded", "entries", commaify(cohort.Size()))
return nil
}
func (ps *PrefixSet) refreshLoop(ctx context.Context) {
if err := ps.reload(ctx); err != nil {
log().Warn("prefix set initial load (will retry)", "err", err)
}
ticker := time.NewTicker(prefixSetRefreshInterval)
defer ticker.Stop()
for {
select {
case <-ctx.Done():
return
case <-ticker.C:
if err := ps.reload(ctx); err != nil {
log().Warn("prefix set reload failed", "err", err)
}
}
}
}