7289da9c72
this commit also remove all the sonic envelope parsing and reintroduces filters in REQ as a slice instead of as a singleton. why? well, the sonic stuff wasn't really that fast, it was a little bit but only got fast enough once I introduced unsafe conversions between []byte and string and did weird unsafe reuse of []byte in order to save the values of tags, which would definitely cause issues in the future if the caller wasn't aware of it (and even if they were, like myself). and the filters stuff is because we abandoned the idea of changing NIP-01 to only accept one filter per REQ.
127 lines
2.7 KiB
Go
127 lines
2.7 KiB
Go
package nostr
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import (
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"bytes"
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"context"
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"crypto/tls"
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"errors"
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"io"
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"net/http"
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"sync/atomic"
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"time"
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ws "github.com/coder/websocket"
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)
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// Connection represents a websocket connection to a Nostr relay.
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type Connection struct {
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conn *ws.Conn
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writeQueue chan writeRequest
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closed *atomic.Bool
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closedNotify chan struct{}
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}
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type writeRequest struct {
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msg []byte
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answer chan error
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}
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// NewConnection creates a new websocket connection to a Nostr relay.
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func NewConnection(
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ctx context.Context,
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url string,
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handleMessage func(string),
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requestHeader http.Header,
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tlsConfig *tls.Config,
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) (*Connection, error) {
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c, _, err := ws.Dial(ctx, url, getConnectionOptions(requestHeader, tlsConfig))
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if err != nil {
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return nil, err
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}
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c.SetReadLimit(2 << 24) // 33MB
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// this will tell if the connection is closed
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// ping every 29 seconds
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ticker := time.NewTicker(29 * time.Second)
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// main websocket loop
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writeQueue := make(chan writeRequest)
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readQueue := make(chan string)
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conn := &Connection{
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conn: c,
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writeQueue: writeQueue,
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closed: &atomic.Bool{},
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closedNotify: make(chan struct{}),
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}
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go func() {
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for {
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select {
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case <-ctx.Done():
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conn.doClose(ws.StatusNormalClosure, "")
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return
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case <-ticker.C:
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ctx, cancel := context.WithTimeoutCause(ctx, time.Millisecond*800, errors.New("ping took too long"))
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err := c.Ping(ctx)
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cancel()
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if err != nil {
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conn.doClose(ws.StatusAbnormalClosure, "ping took too long")
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return
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}
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case wr := <-writeQueue:
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debugLogf("{%s} sending %v\n", url, string(wr.msg))
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ctx, cancel := context.WithTimeoutCause(ctx, time.Second*10, errors.New("write took too long"))
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err := c.Write(ctx, ws.MessageText, wr.msg)
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cancel()
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if err != nil {
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conn.doClose(ws.StatusAbnormalClosure, "write took too long")
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if wr.answer != nil {
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wr.answer <- err
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}
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return
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}
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if wr.answer != nil {
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close(wr.answer)
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}
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case msg := <-readQueue:
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debugLogf("{%s} received %v\n", url, msg)
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handleMessage(msg)
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}
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}
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}()
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// read loop -- loops back to the main loop
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go func() {
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buf := new(bytes.Buffer)
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for {
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buf.Reset()
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_, reader, err := c.Reader(ctx)
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if err != nil {
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conn.doClose(ws.StatusAbnormalClosure, "failed to get reader")
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return
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}
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if _, err := io.Copy(buf, reader); err != nil {
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conn.doClose(ws.StatusAbnormalClosure, "failed to read")
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return
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}
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readQueue <- string(buf.Bytes())
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}
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}()
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return conn, nil
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}
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func (c *Connection) doClose(code ws.StatusCode, reason string) {
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wasClosed := c.closed.Swap(true)
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if !wasClosed {
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c.conn.Close(code, reason)
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close(c.closedNotify)
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close(c.writeQueue)
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}
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}
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