1 files changed, 79 insertions, 0 deletions
diff --git a/src/rgw/rgw_putobj.h b/src/rgw/rgw_putobj.h
new file mode 100644
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+++ b/src/rgw/rgw_putobj.h
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+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2018 Red Hat, Inc.
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation. See file COPYING.
+ *
+ */
+
+#pragma once
+
+#include "include/buffer.h"
+
+namespace rgw::putobj {
+
+// a simple streaming data processing abstraction
+class DataProcessor {
+ public:
+  virtual ~DataProcessor() {}
+
+  // consume a bufferlist in its entirety at the given object offset. an
+  // empty bufferlist is given to request that any buffered data be flushed,
+  // though this doesn't wait for completions
+  virtual int process(bufferlist&& data, uint64_t offset) = 0;
+};
+
+// for composing data processors into a pipeline
+class Pipe : public DataProcessor {
+  DataProcessor *next;
+ public:
+  explicit Pipe(DataProcessor *next) : next(next) {}
+
+  // passes the data on to the next processor
+  int process(bufferlist&& data, uint64_t offset) override {
+    return next->process(std::move(data), offset);
+  }
+};
+
+// pipe that writes to the next processor in discrete chunks
+class ChunkProcessor : public Pipe {
+  uint64_t chunk_size;
+  bufferlist chunk; // leftover bytes from the last call to process()
+ public:
+  ChunkProcessor(DataProcessor *next, uint64_t chunk_size)
+    : Pipe(next), chunk_size(chunk_size)
+  {}
+
+  int process(bufferlist&& data, uint64_t offset) override;
+};
+
+
+// interface to generate the next stripe description
+class StripeGenerator {
+ public:
+  virtual ~StripeGenerator() {}
+
+  virtual int next(uint64_t offset, uint64_t *stripe_size) = 0;
+};
+
+// pipe that respects stripe boundaries and restarts each stripe at offset 0
+class StripeProcessor : public Pipe {
+  StripeGenerator *gen;
+  std::pair<uint64_t, uint64_t> bounds; // bounds of current stripe
+ public:
+  StripeProcessor(DataProcessor *next, StripeGenerator *gen,
+                  uint64_t first_stripe_size)
+    : Pipe(next), gen(gen), bounds(0, first_stripe_size)
+  {}
+
+  int process(bufferlist&& data, uint64_t data_offset) override;
+};
+
+} // namespace rgw::putobj