feat(shwap/bitswap): disable session pruning with env var (#4201)

This is allows us to test the theory behind #4199.

We can merge it to the main s.t. we can also ask our partners to toggle it and see results for them.

Author: Wondertan

share/shwap/p2p/bitswap/getter.go

@@ -3,6 +3,7 @@ package bitswap
 import (
 	"context"
 	"fmt"
+	"os"
 	"sync"
 	"time"
 
@@ -23,6 +24,8 @@ import (
 	"github.com/celestiaorg/celestia-node/share/shwap"
 )
 
+var disablePooling = os.Getenv("CELESTIA_BITSWAP_DISABLE_POOLING") == "1"
+
 var tracer = otel.Tracer("shwap/bitswap")
 
 // Getter implements share.Getter.
@@ -275,6 +278,12 @@ func (g *Getter) isArchival(hdr *header.ExtendedHeader) bool {
 
 // getSession takes a session out of the respective session pool
 func (g *Getter) getSession(isArchival bool) (ses exchange.Fetcher, release func()) {
+	if disablePooling {
+		ctx, cancel := context.WithCancel(context.Background())
+		f := g.exchange.NewSession(ctx)
+		return f, cancel
+	}
+
 	if isArchival {
 		ses = g.archivalPool.get()
 		return ses, func() { g.archivalPool.put(ses) }