From 2ea83c609ac367195f4bcdfdee73d0093829a680 Mon Sep 17 00:00:00 2001
From: Ludovic Chenut <ludovic@status.im>
Date: Tue, 4 Jul 2023 15:45:09 +0200
Subject: [PATCH] Perf protocol

---
 libp2p/protocols/perf.nim | 113 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 113 insertions(+)
 create mode 100644 libp2p/protocols/perf.nim

diff --git a/libp2p/protocols/perf.nim b/libp2p/protocols/perf.nim
new file mode 100644
index 000000000..ba4c7066f
--- /dev/null
+++ b/libp2p/protocols/perf.nim
@@ -0,0 +1,113 @@
+# Nim-LibP2P
+# Copyright (c) 2023 Status Research & Development GmbH
+# Licensed under either of
+#  * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE))
+#  * MIT license ([LICENSE-MIT](LICENSE-MIT))
+# at your option.
+# This file may not be copied, modified, or distributed except according to
+# those terms.
+
+## `Perf <https://github.com/libp2p/specs/blob/master/perf/perf.md>`_ protocol specification
+
+{.push raises: [].}
+
+import chronos, chronicles, sequtils
+import stew/endians2
+import ../protobuf/minprotobuf,
+       ../peerinfo,
+       ../stream/connection,
+       ../peerid,
+       ../crypto/crypto,
+       ../multiaddress,
+       ../protocols/protocol,
+       ../utility,
+       ../errors
+
+export chronicles, rand, connection
+
+logScope:
+  topics = "libp2p perf"
+
+const
+  PerfCodec* = "/perf/1.0.0"
+  PerfSize = 65536
+
+type
+  PerfError* = object of LPError
+
+  Perf* = ref object of LPProtocol
+
+proc new*(T: typedesc[Perf]): T {.public.} =
+  result = Perf()
+
+method init*(p: Perf) =
+  proc handle(conn: Connection, proto: string) {.async, gcsafe, closure.} =
+    var bytesRead = 0
+    try:
+      trace "Received benchmark performance check", conn
+      var
+        sizeBuffer: array[8, byte]
+        size: uint64
+      await conn.readExactly(addr sizeBuffer[0], 8)
+      size = uint64.fromBytesBE(sizeBuffer)
+
+      var toReadBuffer: array[PerfSize, byte]
+      try:
+        while true:
+          bytesRead += await conn.readOnce(addr toReadBuffer[0], PerfSize)
+      except CatchableError as exc:
+        discard
+
+      var buf: array[PerfSize, byte]
+      while size > 0:
+        let toWrite = min(size, PerfSize)
+        await conn.write(buf[0..<toWrite])
+        size -= toWrite
+    except CancelledError as exc:
+      raise exc
+    except CatchableError as exc:
+      trace "exception in perf handler", exc = exc.msg, conn
+    await conn.close()
+
+  p.handler = handle
+  p.codec = PerfCodec
+
+proc perfDownload*(p: Perf, conn: Connection,
+                   sizeToRead: uint64): Future[Duration] {.async, public.} =
+  var
+    size = sizeToRead
+    buf: array[PerfSize, byte]
+  let start = Moment.now()
+  trace "initiating download benchmark", conn
+
+  await conn.write(toSeq(toBytesBE(size)))
+  await conn.close()
+
+  while size > 0:
+    let toRead = min(size, PerfSize)
+    await conn.readExactly(addr buf[0], toRead.int)
+    size = size - toRead
+
+  let duration = Moment.now() - start
+  trace "got download benchmark duration", conn, duration
+  return duration
+
+proc perfUpload*(p: Perf, conn: Connection,
+                 sizeToWrite: uint64): Future[Duration] {.async, public.} =
+  var
+    size = sizeToWrite
+    buf: array[PerfSize, byte]
+  let start = Moment.now()
+  trace "initiating upload benchmark", conn
+
+  await conn.write(toSeq(toBytesBE(0'u64)))
+  while size > 0:
+    let toWrite = min(size, PerfSize)
+    await conn.write(buf[0..<toWrite])
+    size -= toWrite
+
+  await conn.join()
+  
+  let duration = Moment.now() - start
+  trace "got upload benchmark duration", conn, duration
+  return duration