Ported work from https://github.com/AlimovSV/mongodb/tree/docdb

as part of fixing elixir-mongo#273

lib/mongo.ex

@@ -557,26 +557,49 @@ defmodule Mongo do
 
   @doc false
   def raw_find(conn, coll, query, select, opts) do
-    params = [query, select]
-    query = %Query{action: :find, extra: coll}
+    query = filter_nils([
+      find: coll,
+      filter: query,
+      projection: select,
+      batchSize: opts[:batch_size],
+      skip: opts[:skip],
+    ])
+
+    opts = Keyword.drop(opts, [:skip, :batch_size])
+
+    with {:ok, %{"cursor" => %{"id" => id, "firstBatch" => docs}}} <-
+           direct_command(conn, query, opts) do
+      {:ok, %{from: 0, num: Enum.count(docs), cursor_id: id, docs: docs}}
+    end
 
-    with {:ok, _query, reply} <- DBConnection.execute(conn, query, params, defaults(opts)),
-         :ok <- maybe_failure(reply),
-         op_reply(docs: docs, cursor_id: cursor_id, from: from, num: num) = reply,
-         do: {:ok, %{from: from, num: num, cursor_id: cursor_id, docs: docs}}
+    # params = [query, select]
+    # query = %Query{action: :find, extra: coll}
+    # with {:ok, reply} <- DBConnection.execute(conn, query, params, defaults(opts)),
+    #      :ok <- maybe_failure(reply),
+    #      op_reply(docs: docs, cursor_id: cursor_id, from: from, num: num) = reply,
+    #      do: {:ok, %{from: from, num: num, cursor_id: cursor_id, docs: docs}}
   end
 
   @doc false
   def get_more(conn, coll, cursor, opts) do
-    query =
-      filter_nils(
-        getMore: cursor,
-        collection: coll,
-        batchSize: Keyword.get(opts, :batch_size),
-        maxTimeMS: Keyword.get(opts, :max_time_ms)
-      )
+    query = filter_nils([
+      getMore: cursor,
+      collection: coll,
+      batchSize: opts[:batch_size],
+    ])
+
+    opts = Keyword.drop(opts, [:batch_size])
+
+    with {:ok, %{"cursor" => %{"id" => id, "nextBatch" => docs}}} <-
+           direct_command(conn, query, opts) do
+      {:ok, %{from: 0, num: Enum.count(docs), cursor_id: id, docs: docs}}
+    end
 
-    direct_command(conn, query, opts)
+    # query = %Query{action: :get_more, extra: {coll, cursor}}
+    # with {:ok, reply} <- DBConnection.execute(conn, query, [], defaults(opts)),
+    #      :ok <- maybe_failure(reply),
+    #      op_reply(docs: docs, cursor_id: cursor_id, from: from, num: num) = reply,
+    #      do: {:ok, %{from: from, num: num, cursor_id: cursor_id, docs: docs}}
   end
 
   @doc false

lib/mongo/auth/scram.ex

@@ -34,7 +34,7 @@ defmodule Mongo.Auth.SCRAM do
   end
 
   defp first(
-         %{"conversationId" => 1, "payload" => server_payload, "done" => false},
+         %{"conversationId" => conversation_id, "payload" => server_payload, "done" => false},
          first_bare,
          username,
          password,
@@ -54,18 +54,18 @@ defmodule Mongo.Auth.SCRAM do
     server_signature = generate_signature(salted_password, auth_message)
     proof = generate_proof(salted_password, auth_message)
     client_final_message = %BSON.Binary{binary: "#{client_message},#{proof}"}
-    message = [saslContinue: 1, conversationId: 1, payload: client_final_message]
+    message = [saslContinue: 1, conversationId: conversation_id, payload: client_final_message]
 
     {message, server_signature}
   end
 
-  defp second(%{"conversationId" => 1, "payload" => payload, "done" => false}, signature) do
+  defp second(%{"conversationId" => conversation_id, "payload" => payload}, signature) do
     params = parse_payload(payload)
     ^signature = Base.decode64!(params["v"])
-    [saslContinue: 1, conversationId: 1, payload: %BSON.Binary{binary: ""}]
+    [saslContinue: 1, conversationId: conversation_id, payload: %BSON.Binary{binary: ""}]
   end
 
-  defp final(%{"conversationId" => 1, "payload" => %BSON.Binary{binary: ""}, "done" => true}) do
+  defp final(%{"conversationId" => _, "payload" => %BSON.Binary{binary: ""}, "done" => true}) do
     :ok
   end