support wasm (#163)

README.md

@@ -145,6 +145,14 @@ But to use it you need the host to have it installed as a shared library and CGO
 
 To use it, use `-tags=libsecp256k1` whenever you're compiling your program that uses this library.
 
+### Test for Wasm
+
+Install [wasmbrowsertest](https://github.com/agnivade/wasmbrowsertest), then run tests:
+
+```sh
+TEST_RELAY_URL=<relay_url> GOOS=js GOARCH=wasm go test -short ./...
+```
+
 ## Warning: risk of goroutine bloat (if used incorrectly)
 
 Remember to cancel subscriptions, either by calling `.Unsub()` on them or ensuring their `context.Context` will be canceled at some point.

connection.go

@@ -1,3 +1,5 @@
+//go:build !js
+
 package nostr
 
 import (
@@ -179,3 +181,7 @@ func (c *Connection) ReadMessage(ctx context.Context, buf io.Writer) error {
 func (c *Connection) Close() error {
 	return c.conn.Close()
 }
+
+func (c *Connection) Ping(ctx context.Context) error {
+	return wsutil.WriteClientMessage(c.conn, ws.OpPing, nil)
+}

connection_js.go

@@ -0,0 +1,55 @@
+//go:build js
+
+package nostr
+
+import (
+	"context"
+	"crypto/tls"
+	"fmt"
+	"io"
+	"net/http"
+
+	ws "github.com/coder/websocket"
+)
+
+type Connection struct {
+	conn *ws.Conn
+}
+
+func NewConnection(ctx context.Context, url string, requestHeader http.Header, tlsConfig *tls.Config) (*Connection, error) {
+	c, _, err := ws.Dial(ctx, url, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	return &Connection{
+		conn: c,
+	}, nil
+}
+
+func (c *Connection) WriteMessage(ctx context.Context, data []byte) error {
+	if err := c.conn.Write(ctx, ws.MessageBinary, data); err != nil {
+		return fmt.Errorf("failed to write message: %w", err)
+	}
+
+	return nil
+}
+
+func (c *Connection) ReadMessage(ctx context.Context, buf io.Writer) error {
+	_, reader, err := c.conn.Reader(ctx)
+	if err != nil {
+		return fmt.Errorf("failed to get reader: %w", err)
+	}
+	if _, err := io.Copy(buf, reader); err != nil {
+		return fmt.Errorf("failed to read message: %w", err)
+	}
+	return nil
+}
+
+func (c *Connection) Close() error {
+	return c.conn.Close(ws.StatusNormalClosure, "")
+}
+
+func (c *Connection) Ping(ctx context.Context) error {
+	return c.conn.Ping(ctx)
+}

go.mod

@@ -6,6 +6,7 @@ require (
 	github.com/bluekeyes/go-gitdiff v0.7.1
 	github.com/btcsuite/btcd/btcec/v2 v2.3.4
 	github.com/btcsuite/btcd/btcutil v1.1.3
+	github.com/coder/websocket v1.8.12
 	github.com/decred/dcrd/dcrec/secp256k1/v4 v4.3.0
 	github.com/dgraph-io/ristretto v1.0.0
 	github.com/fiatjaf/eventstore v0.9.0

go.sum

@@ -37,6 +37,8 @@ github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UF
 github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
 github.com/cmars/basen v0.0.0-20150613233007-fe3947df716e h1:0XBUw73chJ1VYSsfvcPvVT7auykAJce9FpRr10L6Qhw=
 github.com/cmars/basen v0.0.0-20150613233007-fe3947df716e/go.mod h1:P13beTBKr5Q18lJe1rIoLUqjM+CB1zYrRg44ZqGuQSA=
+github.com/coder/websocket v1.8.12 h1:5bUXkEPPIbewrnkU8LTCLVaxi4N4J8ahufH2vlo4NAo=
+github.com/coder/websocket v1.8.12/go.mod h1:LNVeNrXQZfe5qhS9ALED3uA+l5pPqvwXg3CKoDBB2gs=
 github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
 github.com/davecgh/go-spew v0.0.0-20171005155431-ecdeabc65495/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=

nip13/nip13_test.go

@@ -59,11 +59,11 @@ func TestDoWorkShort(t *testing.T) {
 		Content: "It's just me mining my own business",
 		PubKey:  "a48380f4cfcc1ad5378294fcac36439770f9c878dd880ffa94bb74ea54a6f243",
 	}
-	pow, err := DoWork(context.Background(), event, 0)
+	pow, err := DoWork(context.Background(), event, 2)
 	if err != nil {
 		t.Fatal(err)
 	}
-	testNonceTag(t, pow, 0)
+	testNonceTag(t, pow, 2)
 }
 
 func TestDoWorkLong(t *testing.T) {

nip96/nip96_test.go

@@ -1,3 +1,5 @@
+//go:build !js
+
 package nip96
 
 import (

relay.go

@@ -12,8 +12,6 @@ import (
 	"sync/atomic"
 	"time"
 
-	"github.com/gobwas/ws"
-	"github.com/gobwas/ws/wsutil"
 	"github.com/puzpuzpuz/xsync/v3"
 )
 
@@ -183,7 +181,7 @@ func (r *Relay) ConnectWithTLS(ctx context.Context, tlsConfig *tls.Config) error
 			select {
 			case <-ticker.C:
 				if r.Connection != nil {
-					err := wsutil.WriteClientMessage(r.Connection.conn, ws.OpPing, nil)
+					err := r.Connection.Ping(ctx)
 					if err != nil {
 						InfoLogger.Printf("{%s} error writing ping: %v; closing websocket", r.URL, err)
 						r.Close() // this should trigger a context cancelation

relay_js_test.go

@@ -0,0 +1,84 @@
+//go:build js
+
+package nostr
+
+import (
+	"context"
+	"os"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestConnectContext(t *testing.T) {
+	url := os.Getenv("TEST_RELAY_URL")
+	if url == "" {
+		t.Fatal("please set the environment: $TEST_RELAY_URL")
+	}
+
+	// relay client
+	ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
+	defer cancel()
+	r, err := RelayConnect(ctx, url)
+	assert.NoError(t, err)
+
+	defer r.Close()
+}
+
+func TestConnectContextCanceled(t *testing.T) {
+	url := os.Getenv("TEST_RELAY_URL")
+	if url == "" {
+		t.Fatal("please set the environment: $TEST_RELAY_URL")
+	}
+
+	// relay client
+	ctx, cancel := context.WithCancel(context.Background())
+	cancel() // make ctx expired
+	_, err := RelayConnect(ctx, url)
+	assert.ErrorIs(t, err, context.Canceled)
+}
+
+func TestPublish(t *testing.T) {
+	url := os.Getenv("TEST_RELAY_URL")
+	if url == "" {
+		t.Fatal("please set the environment: $TEST_RELAY_URL")
+	}
+
+	// test note to be sent over websocket
+	priv, pub := makeKeyPair(t)
+	textNote := Event{
+		Kind:      KindTextNote,
+		Content:   "hello",
+		CreatedAt: Timestamp(1672068534), // random fixed timestamp
+		Tags:      Tags{[]string{"foo", "bar"}},
+		PubKey:    pub,
+	}
+	err := textNote.Sign(priv)
+	assert.NoError(t, err)
+
+	// connect a client and send the text note
+	rl := mustRelayConnect(t, url)
+	err = rl.Publish(context.Background(), textNote)
+	assert.NoError(t, err)
+}
+
+func makeKeyPair(t *testing.T) (priv, pub string) {
+	t.Helper()
+
+	privkey := GeneratePrivateKey()
+	pubkey, err := GetPublicKey(privkey)
+	assert.NoError(t, err)
+
+	return privkey, pubkey
+}
+
+func mustRelayConnect(t *testing.T, url string) *Relay {
+	t.Helper()
+
+	rl, err := RelayConnect(context.Background(), url)
+	require.NoError(t, err)
+
+	return rl
+}

relay_test.go

@@ -1,3 +1,5 @@
+//go:build !js
+
 package nostr
 
 import (

sdk/hints/test/libsql_test.go

@@ -1,4 +1,4 @@
-//go:build !sqlite_math_functions
+//go:build !js && !sqlite_math_functions
 
 package test
 

sdk/hints/test/moderncsqlite_test.go

@@ -1,3 +1,5 @@
+//go:build !js
+
 package test
 
 import (

sdk/hints/test/wasmsqlite_test.go

@@ -1,4 +1,4 @@
-//go:build !sqlite_math_functions
+//go:build !js && !sqlite_math_functions
 
 package test