alice.pds.demo.boltless.dev
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knotserver: introduce notifier package
Notifier is a semaphore that can be used to indicate a change in a
resource.
Signed-off-by: oppiliappan <me@oppi.li>
author
oppiliappan
committer
Tangled
date
(Jun 1, 2025, 3:58 PM UTC)
commit
e487d3f7
e487d3f7c080088eefb76489b9a15e86e8e7da77
parent
01cee5e8
01cee5e83f8c90b8b7fe50e0dce99197e1919647
+67
-7
+9
-2
knotserver/db/oplog.go
+9
-2
knotserver/db/oplog.go
···
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3
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import (
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"fmt"
5
+
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+
"tangled.sh/tangled.sh/core/knotserver/notifier"
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)
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type Op struct {
···
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Ref string // the reference being updated
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}
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-
func (d *DB) InsertOp(op Op) error {
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+
func (d *DB) InsertOp(op Op, notifier *notifier.Notifier) error {
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_, err := d.db.Exec(
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`insert into oplog (tid, did, repo, old_sha, new_sha, ref) values (?, ?, ?, ?, ?, ?)`,
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op.Tid,
···
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op.NewSha,
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op.Ref,
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)
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-
return err
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+
if err != nil {
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return err
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}
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+
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notifier.NotifyAll()
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return nil
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}
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func (d *DB) GetOps(cursor string) ([]Op, error) {
+4
-1
knotserver/handler.go
+4
-1
knotserver/handler.go
···
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11
"tangled.sh/tangled.sh/core/jetstream"
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"tangled.sh/tangled.sh/core/knotserver/config"
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"tangled.sh/tangled.sh/core/knotserver/db"
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"tangled.sh/tangled.sh/core/knotserver/notifier"
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"tangled.sh/tangled.sh/core/rbac"
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)
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···
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jc *jetstream.JetstreamClient
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e *rbac.Enforcer
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l *slog.Logger
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+
n *notifier.Notifier
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// init is a channel that is closed when the knot has been initailized
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// i.e. when the first user (knot owner) has been added.
···
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knotInitialized bool
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}
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-
func Setup(ctx context.Context, c *config.Config, db *db.DB, e *rbac.Enforcer, jc *jetstream.JetstreamClient, l *slog.Logger) (http.Handler, error) {
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+
func Setup(ctx context.Context, c *config.Config, db *db.DB, e *rbac.Enforcer, jc *jetstream.JetstreamClient, l *slog.Logger, n *notifier.Notifier) (http.Handler, error) {
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r := chi.NewRouter()
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h := Handle{
···
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e: e,
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l: l,
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jc: jc,
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n: n,
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init: make(chan struct{}),
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}
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+5
-2
knotserver/internal.go
+5
-2
knotserver/internal.go
···
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"github.com/go-chi/chi/v5/middleware"
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"tangled.sh/tangled.sh/core/knotserver/config"
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"tangled.sh/tangled.sh/core/knotserver/db"
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+
"tangled.sh/tangled.sh/core/knotserver/notifier"
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"tangled.sh/tangled.sh/core/rbac"
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)
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···
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c *config.Config
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e *rbac.Enforcer
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l *slog.Logger
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n *notifier.Notifier
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}
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func (h *InternalHandle) PushAllowed(w http.ResponseWriter, r *http.Request) {
···
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}
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for _, op := range ops {
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-
err := h.db.InsertOp(op)
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err := h.db.InsertOp(op, h.n)
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if err != nil {
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l.Error("failed to insert op", "err", err, "op", op)
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continue
···
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return
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}
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-
func Internal(ctx context.Context, c *config.Config, db *db.DB, e *rbac.Enforcer, l *slog.Logger) http.Handler {
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func Internal(ctx context.Context, c *config.Config, db *db.DB, e *rbac.Enforcer, l *slog.Logger, n *notifier.Notifier) http.Handler {
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r := chi.NewRouter()
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h := InternalHandle{
···
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c,
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e,
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l,
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n,
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}
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r.Get("/push-allowed", h.PushAllowed)
+43
knotserver/notifier/notifier.go
+43
knotserver/notifier/notifier.go
···
1
+
package notifier
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+
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import (
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"sync"
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)
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+
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type Notifier struct {
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subscribers map[chan struct{}]struct{}
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mu sync.Mutex
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}
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func New() Notifier {
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return Notifier{
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subscribers: make(map[chan struct{}]struct{}),
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}
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}
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+
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func (n *Notifier) Subscribe() chan struct{} {
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ch := make(chan struct{}, 1)
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n.mu.Lock()
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n.subscribers[ch] = struct{}{}
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n.mu.Unlock()
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return ch
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}
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func (n *Notifier) Unsubscribe(ch chan struct{}) {
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n.mu.Lock()
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delete(n.subscribers, ch)
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close(ch)
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n.mu.Unlock()
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}
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+
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func (n *Notifier) NotifyAll() {
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n.mu.Lock()
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for ch := range n.subscribers {
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select {
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case ch <- struct{}{}:
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default:
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// avoid blocking if channel is full
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}
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}
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n.mu.Unlock()
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}
+6
-2
knotserver/server.go
+6
-2
knotserver/server.go
···
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"tangled.sh/tangled.sh/core/jetstream"
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"tangled.sh/tangled.sh/core/knotserver/config"
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"tangled.sh/tangled.sh/core/knotserver/db"
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+
"tangled.sh/tangled.sh/core/knotserver/notifier"
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"tangled.sh/tangled.sh/core/log"
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"tangled.sh/tangled.sh/core/rbac"
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)
···
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logger.Error("failed to setup jetstream", "error", err)
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}
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-
mux, err := Setup(ctx, c, db, e, jc, logger)
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notifier := notifier.New()
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mux, err := Setup(ctx, c, db, e, jc, logger, ¬ifier)
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if err != nil {
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return fmt.Errorf("failed to setup server: %w", err)
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}
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-
imux := Internal(ctx, c, db, e, iLogger)
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+
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imux := Internal(ctx, c, db, e, iLogger, ¬ifier)
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logger.Info("starting internal server", "address", c.Server.InternalListenAddr)
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go http.ListenAndServe(c.Server.InternalListenAddr, imux)