From 1071e63d1c49d75e6b2cbe01f80b89e84e5db71f Mon Sep 17 00:00:00 2001
From: Emery Hemingway <ehmry@posteo.net>
Date: Wed, 5 Jun 2019 21:57:13 +0200
Subject: [PATCH] File transfers

---
 src/blobset.nim | 84 ++++++++++++++++++++++++++++++++++++++-----------
 1 file changed, 66 insertions(+), 18 deletions(-)

diff --git a/src/blobset.nim b/src/blobset.nim
index 1c832a7..64109a2 100644
--- a/src/blobset.nim
+++ b/src/blobset.nim
@@ -52,31 +52,79 @@ when defined(spry):
     discard result.evalRoot("""[loadFile: "blobs.sy"]""")
 
 when defined(tox) and defined(spry):
+  type IngestTransfer = object
+    name: string
+    stream: IngestStream
+    size, pos: uint64
+
+  proc process(
+      t: var IngestTransfer; tox: Tox; friend: Friend; file: FileTransfer;
+      pos: uint64; data: pointer; size: int): bool =
+    ## Process transfer data, return true if transfer is complete
+    if t.pos != pos:
+      cancel t.stream
+      tox.control(friend, file, TOX_FILE_CONTROL_CANCEL)
+      discard tox.send(friend, """stream is at position $# but you sent $#""" % [$t.pos, $pos])
+      result = true
+    else:
+      waitFor t.stream.ingest(data, size)
+      t.pos.inc size
+      if t.pos >= t.size:
+        let blobId, blobSize = waitFor t.stream.finish()
+        discard tox.send(friend, """$# $# $#""" % [t.name, $blobId, $blobSize])
+        result = true
+
+  type Transfer = uint64
+  proc `+`(friend: Friend; file: FileTransfer): Transfer =
+    (friend.Transfer shl 32) or file.Transfer
+
   proc setupCallbacks(tox: Tox) =
     tox.onSelfConnectionStatus do (status: TOX_CONNECTION):
       echo "self status is ", status
-    let
-      store = openStore()
-      spry = newSpry(store)
-    proc eval(code: string): string {.gcsafe.} =
-      $(spry.evalRoot(code))
-    tox.onFriendMessage do (friend: Friend; msg: string; kind: TOX_MESSAGE_TYPE):
-      try:
-        if kind == TOX_MESSAGE_TYPE_NORMAL:
-          tox.typing(friend, true)
-          let res = eval("[" & msg & "]")
-          tox.typing(friend, false)
-          discard tox.send(friend, $res, TOX_MESSAGE_TYPE_ACTION)
-      except:
-        discard tox.send(friend, getCurrentExceptionMsg())
-
     tox.onFriendRequest do (key: PublicKey; msg: string):
       echo "friend request from ", key, ", ", msg
       discard tox.addFriendNoRequest(key)
+    block:
+      let
+        store = openStore()
+        spry = newSpry(store)
+        transfers = newTable[Transfer, IngestTransfer](16)
+      tox.onFriendMessage do (friend: Friend; msg: string; kind: TOX_MESSAGE_TYPE):
+        try:
+          if kind == TOX_MESSAGE_TYPE_NORMAL:
+            tox.typing(friend, true)
+            let res = spry.evalRoot("[" & msg & "]")
+            tox.typing(friend, false)
+            discard tox.send(friend, $res, TOX_MESSAGE_TYPE_ACTION)
+        except:
+          discard tox.send(friend, getCurrentExceptionMsg())
+      tox.onFileRecv do (friend: Friend; file: FileTransfer; kind: uint32; size: uint64; filename: string):
+        case kind
+        of (uint32)TOX_FILE_KIND_AVATAR:
+          tox.control(friend, file, TOX_FILE_CONTROL_CANCEL)
+        else:
+          if transfers.len > 16:
+            tox.control(friend, file, TOX_FILE_CONTROL_CANCEL)
+            discard tox.send(friend, "too many transfers are pending")
+          else:
+            let msg = """you are trying to send me "$#", type $#, size $#""" %
+              [filename, $kind, $size]
+            discard tox.send(friend, msg)
+            transfers[friend+file] = IngestTransfer(
+              name: filename,
+              stream: store.openIngestStream(size.BiggestInt),
+              size: size)
+            tox.control(friend, file, TOX_FILE_CONTROL_RESUME)
+      tox.onFileRecvChunk do (friend: Friend; file: FileTransfer; pos: uint64; data: pointer; size: int):
+        try:
+          if transfers[friend+file].process(tox, friend, file, pos, data, size):
+            transfers.del(friend+file)
+        except:
+          discard tox.send(friend, getCurrentExceptionMsg(), TOX_MESSAGE_TYPE_ACTION)
+
     tox.name = "blobbot"
-    echo "callbacks set"
-    echo "Tox address: ", tox.address
-    echo "Tox DHT:     ", tox.udpPort, " ", tox.dhtId
+    echo "/connect 127.0.0.1 ", tox.udpPort, " ", tox.dhtId
+    echo "/add ", tox.address
 
   proc toxMain() {.async.} =
     let tox = newTox do (o: Options):