1 files changed, 349 insertions, 0 deletions
diff --git a/src/rgw/rgw_cr_rest.cc b/src/rgw/rgw_cr_rest.cc
new file mode 100644
index 00000000..6a5e38a2
--- /dev/null
+++ b/src/rgw/rgw_cr_rest.cc
@@ -0,0 +1,349 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "rgw_cr_rest.h"
+
+#include "rgw_coroutine.h"
+
+// re-include our assert to clobber the system one; fix dout:
+#include "include/ceph_assert.h"
+
+#include <boost/asio/yield.hpp>
+
+#define dout_context g_ceph_context
+#define dout_subsys ceph_subsys_rgw
+
+RGWCRHTTPGetDataCB::RGWCRHTTPGetDataCB(RGWCoroutinesEnv *_env, RGWCoroutine *_cr, RGWHTTPStreamRWRequest *_req) : lock("RGWCRHTTPGetDataCB"), env(_env), cr(_cr), req(_req) {
+  io_id = req->get_io_id(RGWHTTPClient::HTTPCLIENT_IO_READ |RGWHTTPClient::HTTPCLIENT_IO_CONTROL);
+  req->set_in_cb(this);
+}
+
+#define GET_DATA_WINDOW_SIZE 2 * 1024 * 1024
+
+int RGWCRHTTPGetDataCB::handle_data(bufferlist& bl, bool *pause) {
+  if (data.length() < GET_DATA_WINDOW_SIZE / 2) {
+    notified = false;
+  }
+
+  {
+    uint64_t bl_len = bl.length();
+
+    Mutex::Locker l(lock);
+
+    if (!got_all_extra_data) {
+      uint64_t max = extra_data_len - extra_data.length();
+      if (max > bl_len) {
+        max = bl_len;
+      }
+      bl.splice(0, max, &extra_data);
+      bl_len -= max;
+      got_all_extra_data = extra_data.length() == extra_data_len;
+    }
+
+    data.append(bl);
+  }
+
+  uint64_t data_len = data.length();
+  if (data_len >= GET_DATA_WINDOW_SIZE && !notified) {
+    notified = true;
+    env->manager->io_complete(cr, io_id);
+  }
+  if (data_len >= 2 * GET_DATA_WINDOW_SIZE) {
+    *pause = true;
+    paused = true;
+  }
+  return 0;
+}
+
+void RGWCRHTTPGetDataCB::claim_data(bufferlist *dest, uint64_t max) {
+  bool need_to_unpause = false;
+
+  {
+    Mutex::Locker l(lock);
+
+    if (data.length() == 0) {
+      return;
+    }
+
+    if (data.length() < max) {
+      max = data.length();
+    }
+
+    data.splice(0, max, dest);
+    need_to_unpause = (paused && data.length() <= GET_DATA_WINDOW_SIZE);
+  }
+
+  if (need_to_unpause) {
+    req->unpause_receive();
+  }
+}
+
+RGWStreamReadHTTPResourceCRF::~RGWStreamReadHTTPResourceCRF()
+{
+  if (req) {
+    req->cancel();
+    req->wait();
+    delete req;
+  }
+}
+
+int RGWStreamReadHTTPResourceCRF::init()
+{
+  env->stack->init_new_io(req);
+
+  in_cb.emplace(env, caller, req);
+
+  int r = http_manager->add_request(req);
+  if (r < 0) {
+    return r;
+  }
+
+  return 0;
+}
+
+int RGWStreamWriteHTTPResourceCRF::send()
+{
+  env->stack->init_new_io(req);
+
+  req->set_write_drain_cb(&write_drain_notify_cb);
+
+  int r = http_manager->add_request(req);
+  if (r < 0) {
+    return r;
+  }
+
+  return 0;
+}
+
+bool RGWStreamReadHTTPResourceCRF::has_attrs()
+{
+  return got_attrs;
+}
+
+void RGWStreamReadHTTPResourceCRF::get_attrs(std::map<string, string> *attrs)
+{
+  req->get_out_headers(attrs);
+}
+
+int RGWStreamReadHTTPResourceCRF::decode_rest_obj(map<string, string>& headers, bufferlist& extra_data) {
+  /* basic generic implementation */
+  for (auto header : headers) {
+    const string& val = header.second;
+
+    rest_obj.attrs[header.first] = val;
+  }
+
+  return 0;
+}
+
+int RGWStreamReadHTTPResourceCRF::read(bufferlist *out, uint64_t max_size, bool *io_pending)
+{
+    reenter(&read_state) {
+    io_read_mask = req->get_io_id(RGWHTTPClient::HTTPCLIENT_IO_READ | RGWHTTPClient::HTTPCLIENT_IO_CONTROL);
+    while (!req->is_done() ||
+           in_cb->has_data()) {
+      *io_pending = true;
+      if (!in_cb->has_data()) {
+        yield caller->io_block(0, io_read_mask);
+      }
+      got_attrs = true;
+      if (need_extra_data() && !got_extra_data) {
+        if (!in_cb->has_all_extra_data()) {
+          continue;
+        }
+        extra_data.claim_append(in_cb->get_extra_data());
+        map<string, string> attrs;
+        req->get_out_headers(&attrs);
+        int ret = decode_rest_obj(attrs, extra_data);
+        if (ret < 0) {
+          ldout(cct, 0) << "ERROR: " << __func__ << " decode_rest_obj() returned ret=" << ret << dendl;
+          return ret;
+        }
+        got_extra_data = true;
+      }
+      *io_pending = false;
+      in_cb->claim_data(out, max_size);
+      if (out->length() == 0) {
+        /* this may happen if we just read the prepended extra_data and didn't have any data
+         * after. In that case, retry reading, so that caller doesn't assume it's EOF.
+         */
+        continue;
+      }
+      if (!req->is_done() || out->length() >= max_size) {
+        yield;
+      }
+    }
+  }
+  return 0;
+}
+
+bool RGWStreamReadHTTPResourceCRF::is_done()
+{
+  return req->is_done();
+}
+
+RGWStreamWriteHTTPResourceCRF::~RGWStreamWriteHTTPResourceCRF()
+{
+  if (req) {
+    req->cancel();
+    req->wait();
+    delete req;
+  }
+}
+
+void RGWStreamWriteHTTPResourceCRF::send_ready(const rgw_rest_obj& rest_obj)
+{
+  req->set_send_length(rest_obj.content_len);
+  for (auto h : rest_obj.attrs) {
+    req->append_header(h.first, h.second);
+  }
+}
+
+#define PENDING_WRITES_WINDOW (1 * 1024 * 1024)
+
+void RGWStreamWriteHTTPResourceCRF::write_drain_notify(uint64_t pending_size)
+{
+  lock_guard l(blocked_lock);
+  if (is_blocked && (pending_size < PENDING_WRITES_WINDOW / 2)) {
+    env->manager->io_complete(caller, req->get_io_id(RGWHTTPClient::HTTPCLIENT_IO_WRITE | RGWHTTPClient::HTTPCLIENT_IO_CONTROL));
+    is_blocked = false;
+  }
+}
+
+void RGWStreamWriteHTTPResourceCRF::WriteDrainNotify::notify(uint64_t pending_size)
+{
+  crf->write_drain_notify(pending_size);
+}
+
+int RGWStreamWriteHTTPResourceCRF::write(bufferlist& data, bool *io_pending)
+{
+  reenter(&write_state) {
+    while (!req->is_done()) {
+      *io_pending = false;
+      if (req->get_pending_send_size() >= PENDING_WRITES_WINDOW) {
+        *io_pending = true;
+        {
+          lock_guard l(blocked_lock);
+          is_blocked = true;
+
+          /* it's ok to unlock here, even if io_complete() arrives before io_block(), it'll wakeup
+           * correctly */
+        }
+        yield caller->io_block(0, req->get_io_id(RGWHTTPClient::HTTPCLIENT_IO_WRITE | RGWHTTPClient::HTTPCLIENT_IO_CONTROL));
+      }
+      yield req->add_send_data(data);
+    }
+    return req->get_status();
+  }
+  return 0;
+}
+
+int RGWStreamWriteHTTPResourceCRF::drain_writes(bool *need_retry)
+{
+  reenter(&drain_state) {
+    *need_retry = true;
+    yield req->finish_write();
+    *need_retry = !req->is_done();
+    while (!req->is_done()) {
+      yield caller->io_block(0, req->get_io_id(RGWHTTPClient::HTTPCLIENT_IO_CONTROL));
+      *need_retry = !req->is_done();
+    }
+
+    map<string, string> headers;
+    req->get_out_headers(&headers);
+    handle_headers(headers);
+
+    return req->get_req_retcode();
+  }
+  return 0;
+}
+
+RGWStreamSpliceCR::RGWStreamSpliceCR(CephContext *_cct, RGWHTTPManager *_mgr,
+                           shared_ptr<RGWStreamReadHTTPResourceCRF>& _in_crf,
+                           shared_ptr<RGWStreamWriteHTTPResourceCRF>& _out_crf) : RGWCoroutine(_cct), cct(_cct), http_manager(_mgr),
+                                                               in_crf(_in_crf), out_crf(_out_crf) {}
+RGWStreamSpliceCR::~RGWStreamSpliceCR() { }
+
+int RGWStreamSpliceCR::operate() {
+  reenter(this) {
+    {
+      int ret = in_crf->init();
+      if (ret < 0) {
+        return set_cr_error(ret);
+      }
+    }
+
+    do {
+
+      bl.clear();
+
+      do {
+        yield {
+          ret = in_crf->read(&bl, 4 * 1024 * 1024, &need_retry);
+          if (ret < 0)  {
+            return set_cr_error(ret);
+          }
+        }
+
+        if (retcode < 0) {
+          ldout(cct, 20) << __func__ << ": in_crf->read() retcode=" << retcode << dendl;
+          return set_cr_error(ret);
+        }
+      } while (need_retry);
+
+      ldout(cct, 20) << "read " << bl.length() << " bytes" << dendl;
+
+      if (!in_crf->has_attrs()) {
+        assert (bl.length() == 0);
+        continue;
+      }
+
+      if (!sent_attrs) {
+        int ret = out_crf->init();
+        if (ret < 0) {
+          return set_cr_error(ret);
+        }
+        out_crf->send_ready(in_crf->get_rest_obj());
+        ret = out_crf->send();
+        if (ret < 0) {
+          return set_cr_error(ret);
+        }
+        sent_attrs = true;
+      }
+
+      if (bl.length() == 0 && in_crf->is_done()) {
+        break;
+      }
+
+      total_read += bl.length();
+
+      do {
+        yield {
+          ldout(cct, 20) << "writing " << bl.length() << " bytes" << dendl;
+          ret = out_crf->write(bl, &need_retry);
+          if (ret < 0)  {
+            return set_cr_error(ret);
+          }
+        }
+
+        if (retcode < 0) {
+          ldout(cct, 20) << __func__ << ": out_crf->write() retcode=" << retcode << dendl;
+          return set_cr_error(ret);
+        }
+      } while (need_retry);
+    } while (true);
+
+    do {
+      yield {
+        int ret = out_crf->drain_writes(&need_retry);
+        if (ret < 0) {
+          return set_cr_error(ret);
+        }
+      }
+    } while (need_retry);
+
+    return set_cr_done();
+  }
+  return 0;
+}
+