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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180/// heavily inspired by <https://github.com/bluesky-social/atproto/blob/c7f5a868837d3e9b3289f988fee2267789327b06/packages/tap/README.md>
package tapc
import ( "bytes" "context" "encoding/base64" "encoding/json" "fmt" "net/http" "net/url" "time"
"github.com/bluesky-social/indigo/atproto/syntax" "github.com/gorilla/websocket" "tangled.org/core/log")
type Handler interface { OnEvent(ctx context.Context, evt Event) error OnError(ctx context.Context, err error)}
type ConnectHandler interface { OnConnect(ctx context.Context)}
type Client struct { Url string AdminPassword string HTTPClient *http.Client}
func NewClient(url, adminPassword string) Client { return Client{ Url: url, AdminPassword: adminPassword, HTTPClient: &http.Client{}, }}
func (c *Client) AddRepos(ctx context.Context, dids []syntax.DID) error { body, err := json.Marshal(map[string][]syntax.DID{"dids": dids}) if err != nil { return err } req, err := http.NewRequestWithContext(ctx, "POST", c.Url+"/repos/add", bytes.NewReader(body)) if err != nil { return err } req.SetBasicAuth("admin", c.AdminPassword) req.Header.Set("Content-Type", "application/json")
resp, err := c.HTTPClient.Do(req) if err != nil { return err } defer resp.Body.Close() if resp.StatusCode != http.StatusOK { return fmt.Errorf("tap: /repos/add failed with status %d", resp.StatusCode) } return nil}
func (c *Client) RemoveRepos(ctx context.Context, dids []syntax.DID) error { body, err := json.Marshal(map[string][]syntax.DID{"dids": dids}) if err != nil { return err } req, err := http.NewRequestWithContext(ctx, "POST", c.Url+"/repos/remove", bytes.NewReader(body)) if err != nil { return err } req.SetBasicAuth("admin", c.AdminPassword) req.Header.Set("Content-Type", "application/json")
resp, err := c.HTTPClient.Do(req) if err != nil { return err } defer resp.Body.Close() if resp.StatusCode != http.StatusOK { return fmt.Errorf("tap: /repos/remove failed with status %d", resp.StatusCode) } return nil}
func (c *Client) Connect(ctx context.Context, handler Handler) error { l := log.FromContext(ctx)
u, err := url.Parse(c.Url) if err != nil { return err } if u.Scheme == "https" { u.Scheme = "wss" } else { u.Scheme = "ws" } u.Path = "/channel"
url := u.String() basicAuth := "Basic " + base64.StdEncoding.EncodeToString([]byte("admin:"+c.AdminPassword))
var backoff int for { select { case <-ctx.Done(): return ctx.Err() default: }
header := http.Header{ "Authorization": []string{basicAuth}, } conn, res, err := websocket.DefaultDialer.DialContext(ctx, url, header) if err != nil { if backoff < 12 { backoff++ } l.Warn("dialing failed", "url", url, "err", err, "backoff", backoff) time.Sleep(time.Duration(5*backoff) * time.Second)
continue } backoff = 0 l.Info("connected to tap service", "subscription_code", res.StatusCode)
if ch, ok := handler.(ConnectHandler); ok { ch.OnConnect(ctx) }
if err = c.handleConnection(ctx, conn, handler); err != nil { l.Warn("tap connection failed", "err", err) } }}
func (c *Client) handleConnection(ctx context.Context, conn *websocket.Conn, handler Handler) error { l := log.FromContext(ctx)
defer func() { conn.Close() l.Warn("closed tap connection") }() l.Info("established tap connection")
for { select { case <-ctx.Done(): return ctx.Err() default: } _, message, err := conn.ReadMessage() if err != nil { return err }
var ev Event if err := json.Unmarshal(message, &ev); err != nil { handler.OnError(ctx, fmt.Errorf("failed to parse message: %w", err)) continue } if err := handler.OnEvent(ctx, ev); err != nil { handler.OnError(ctx, fmt.Errorf("failed to process event %d: %w", ev.ID, err)) continue }
ack := map[string]any{ "type": "ack", "id": ev.ID, } if err := conn.WriteJSON(ack); err != nil { l.Warn("failed to send ack", "err", err) continue } }}