From 1e3ef6e08a284f1a7874754da874ae5356661caa Mon Sep 17 00:00:00 2001
From: Chris Hager <chris@linuxuser.at>
Date: Thu, 1 Aug 2024 20:43:48 +0200
Subject: [PATCH] hook up webserver to bid-processor

---
 services/bidcollect/bid-processor.go       | 23 +++++++++++++---
 services/bidcollect/webserver/handler.go   | 13 ++++-----
 services/bidcollect/webserver/webserver.go | 31 +++++++++-------------
 3 files changed, 38 insertions(+), 29 deletions(-)

diff --git a/services/bidcollect/bid-processor.go b/services/bidcollect/bid-processor.go
index 6228605..065d229 100644
--- a/services/bidcollect/bid-processor.go
+++ b/services/bidcollect/bid-processor.go
@@ -10,6 +10,7 @@ import (
 
 	"github.com/flashbots/relayscan/common"
 	"github.com/flashbots/relayscan/services/bidcollect/types"
+	"github.com/flashbots/relayscan/services/bidcollect/webserver"
 	"github.com/sirupsen/logrus"
 )
 
@@ -20,10 +21,11 @@ import (
 //   - One CSV for top bids only
 
 type BidProcessorOpts struct {
-	Log       *logrus.Entry
-	UID       string
-	OutDir    string
-	OutputTSV bool
+	Log           *logrus.Entry
+	UID           string
+	OutDir        string
+	OutputTSV     bool
+	WebserverAddr string
 }
 
 type OutFiles struct {
@@ -44,6 +46,8 @@ type BidProcessor struct {
 
 	csvSeparator  string
 	csvFileEnding string
+
+	webserver *webserver.Server
 }
 
 func NewBidProcessor(opts *BidProcessorOpts) *BidProcessor {
@@ -63,10 +67,20 @@ func NewBidProcessor(opts *BidProcessorOpts) *BidProcessor {
 		c.csvFileEnding = "csv"
 	}
 
+	if opts.WebserverAddr != "" {
+		c.webserver = webserver.New(&webserver.HTTPServerConfig{
+			ListenAddr: opts.WebserverAddr,
+			Log:        opts.Log,
+		})
+	}
 	return c
 }
 
 func (c *BidProcessor) Start() {
+	if c.webserver != nil {
+		c.webserver.RunInBackground()
+	}
+
 	for {
 		time.Sleep(30 * time.Second)
 		c.housekeeping()
@@ -103,6 +117,7 @@ func (c *BidProcessor) processBids(bids []*types.CommonBid) {
 			isNewBid = true
 		}
 
+		// Send to subscribers
 		// Write to CSV
 		c.writeBidToFile(bid, isNewBid, isTopBid)
 	}
diff --git a/services/bidcollect/webserver/handler.go b/services/bidcollect/webserver/handler.go
index d90c35e..34aef46 100644
--- a/services/bidcollect/webserver/handler.go
+++ b/services/bidcollect/webserver/handler.go
@@ -3,7 +3,9 @@ package webserver
 import (
 	"fmt"
 	"net/http"
+	"strings"
 
+	"github.com/flashbots/relayscan/services/bidcollect/types"
 	"github.com/google/uuid"
 )
 
@@ -30,7 +32,10 @@ func (srv *Server) handleSSESubscription(w http.ResponseWriter, r *http.Request)
 	}
 	srv.addSubscriber(&subscriber)
 
-	// pingTicker := time.NewTicker(5 * time.Second)
+	// Send CSV header
+	helloMsg := strings.Join(types.CommonBidCSVFields, "\t") + "\n"
+	fmt.Fprint(w, helloMsg)
+	w.(http.Flusher).Flush() //nolint:forcetypeassert
 
 	// Wait for txs or end of request...
 	for {
@@ -41,12 +46,8 @@ func (srv *Server) handleSSESubscription(w http.ResponseWriter, r *http.Request)
 			return
 
 		case msg := <-subscriber.msgC:
-			fmt.Fprintf(w, "data: %s\n\n", msg)
+			fmt.Fprintf(w, "%s\n", msg)
 			w.(http.Flusher).Flush() //nolint:forcetypeassert
-
-			// case <-pingTicker.C:
-			// 	fmt.Fprintf(w, ": ping\n\n")
-			// 	w.(http.Flusher).Flush() //nolint:forcetypeassert
 		}
 	}
 }
diff --git a/services/bidcollect/webserver/webserver.go b/services/bidcollect/webserver/webserver.go
index 5282077..51c19ab 100644
--- a/services/bidcollect/webserver/webserver.go
+++ b/services/bidcollect/webserver/webserver.go
@@ -20,10 +20,8 @@ type HTTPServerConfig struct {
 	ListenAddr string
 	Log        *logrus.Entry
 
-	DrainDuration            time.Duration
-	GracefulShutdownDuration time.Duration
-	ReadTimeout              time.Duration
-	WriteTimeout             time.Duration
+	ReadTimeout  time.Duration
+	WriteTimeout time.Duration
 }
 
 type Server struct {
@@ -73,9 +71,7 @@ func (srv *Server) RunInBackground() {
 
 func (srv *Server) Shutdown() {
 	// api
-	ctx, cancel := context.WithTimeout(context.Background(), srv.cfg.GracefulShutdownDuration)
-	defer cancel()
-	if err := srv.srv.Shutdown(ctx); err != nil {
+	if err := srv.srv.Shutdown(context.Background()); err != nil {
 		srv.log.WithField("err", err).Error("Graceful HTTP server shutdown failed")
 	} else {
 		srv.log.Info("HTTP server gracefully stopped")
@@ -107,18 +103,15 @@ func (srv *Server) SendBid(ctx context.Context, bid *types.CommonBid) error {
 		return nil
 	}
 
-	// txRLP, err := common.TxToRLPString(tx.Tx)
-	// if err != nil {
-	// 	return err
-	// }
-
-	// // Send tx to all subscribers (only if channel is not full)
-	// for _, sub := range s.sseConnectionMap {
-	// 	select {
-	// 	case sub.txC <- txRLP:
-	// 	default:
-	// 	}
-	// }
+	msg := bid.ToCSVLine("\t")
+
+	// Send tx to all subscribers (only if channel is not full)
+	for _, sub := range srv.sseConnectionMap {
+		select {
+		case sub.msgC <- msg:
+		default:
+		}
+	}
 
 	return nil
 }