Adding file upload and download capabilities (#1610)

util/file/proto/file.proto

@@ -0,0 +1,68 @@
+syntax = "proto3";
+
+package go.micro.server;
+
+service File {
+	rpc Open(OpenRequest) returns(OpenResponse) {};
+	rpc Stat(StatRequest) returns(StatResponse) {};
+	rpc Read(ReadRequest) returns(ReadResponse) {};
+	rpc Write(WriteRequest) returns(WriteResponse) {};
+	rpc Close(CloseRequest) returns(CloseResponse) {};
+}
+
+message OpenRequest {
+	string filename = 1;
+}
+
+message OpenResponse {
+	int64 id = 1;
+	bool result = 2;
+}
+
+message CloseRequest {
+	int64 id = 1;
+}
+
+message CloseResponse {
+}
+
+message StatRequest {
+	string filename = 1;
+}
+
+message StatResponse {
+	string type = 1;
+	int64 size = 2;
+	int64 last_modified = 3;
+}
+
+message ReadRequest {
+	int64 id = 1;
+	int64 offset = 2;
+	int64 size = 3;
+}
+
+message ReadResponse {
+	int64 size = 1;
+	bytes data = 2;
+	bool eof = 3;
+}
+
+message GetRequest {
+	int64 id = 1;
+	int64 block_id = 2;
+}
+
+message GetResponse {
+	int64 block_id = 1;
+	int64 size = 2;
+	bytes data = 3;
+}
+
+message WriteRequest {
+	int64 id = 1;
+	int64 offset = 2;
+	bytes data = 3;
+}
+
+message WriteResponse {}