[HICN-534] Major rework on libtransport organization

Change-Id: I361b83a18b4fd59be136d5f0817fc28e17e89884
Signed-off-by: Mauro Sardara <msardara@cisco.com>

1 files changed, 317 insertions, 0 deletions

diff --git a/libtransport/src/http/client_connection.cc b/libtransport/src/http/client_connection.cc
new file mode 100644
index 000000000..7a3a636fe
--- /dev/null
+++ b/libtransport/src/http/client_connection.cc
@@ -0,0 +1,317 @@
+/*
+ * Copyright (c) 2017-2020 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <hicn/transport/core/content_object.h>
+#include <hicn/transport/core/interest.h>
+#include <hicn/transport/http/client_connection.h>
+#include <hicn/transport/utils/hash.h>
+#include <hicn/transport/utils/log.h>
+
+#include <asio.hpp>
+#include <asio/steady_timer.hpp>
+
+#define DEFAULT_BETA 0.99
+#define DEFAULT_GAMMA 0.07
+
+namespace transport {
+
+namespace http {
+
+using namespace transport;
+
+class HTTPClientConnection::Implementation
+    : public ConsumerSocket::ReadCallback {
+  static constexpr uint32_t max_buffer_capacity = 64 * 1024;
+
+ public:
+  Implementation(HTTPClientConnection *http_client)
+      : http_client_(http_client),
+        consumer_(TransportProtocolAlgorithms::RAAQM),
+        read_bytes_callback_(nullptr),
+        read_buffer_(nullptr),
+        response_(std::make_shared<HTTPResponse>()),
+        timer_(nullptr) {
+    consumer_.setSocketOption(
+        ConsumerCallbacksOptions::CONTENT_OBJECT_TO_VERIFY,
+        (ConsumerContentObjectVerificationCallback)std::bind(
+            &Implementation::verifyData, this, std::placeholders::_1,
+            std::placeholders::_2));
+
+    consumer_.setSocketOption(ConsumerCallbacksOptions::READ_CALLBACK, this);
+
+    consumer_.connect();
+    timer_ = std::make_unique<asio::steady_timer>(consumer_.getIoService());
+  }
+
+  RC get(const std::string &url, HTTPHeaders headers = {},
+         HTTPPayload &&payload = nullptr,
+         std::shared_ptr<HTTPResponse> response = nullptr,
+         ReadBytesCallback *callback = nullptr,
+         std::string ipv6_first_word = "b001") {
+    return sendRequest(url, HTTPMethod::GET, headers, std::move(payload),
+                       response, callback, ipv6_first_word);
+  }
+
+  RC sendRequest(const std::string &url, HTTPMethod method,
+                 HTTPHeaders headers = {}, HTTPPayload &&payload = nullptr,
+                 std::shared_ptr<HTTPResponse> response = nullptr,
+                 ReadBytesCallback *callback = nullptr,
+                 std::string ipv6_first_word = "b001") {
+    current_url_ = url;
+    read_bytes_callback_ = callback;
+    if (!response) {
+      response_ = std::make_shared<HTTPResponse>();
+    } else {
+      response_ = response;
+    }
+
+    auto start = std::chrono::steady_clock::now();
+    request_.init(method, url, headers, std::move(payload));
+
+    success_callback_ = [this, method = std::move(method), url = std::move(url),
+                         start = std::move(start)](std::size_t size) -> void {
+      auto end = std::chrono::steady_clock::now();
+      TRANSPORT_LOGI(
+          "%s %s [%s] duration: %llu [usec] %zu [bytes]\n",
+          method_map[method].c_str(), url.c_str(), name_.str().c_str(),
+          (unsigned long long)
+              std::chrono::duration_cast<std::chrono::microseconds>(end - start)
+                  .count(),
+          size);
+    };
+
+    sendRequestGetReply(ipv6_first_word);
+    return return_code_;
+  }
+
+  std::shared_ptr<HTTPResponse> response() {
+    response_->coalescePayloadBuffer();
+    return response_;
+  }
+
+  HTTPClientConnection &stop() {
+    // This is thread safe and can be called from another thread
+    consumer_.stop();
+
+    return *http_client_;
+  }
+
+  interface::ConsumerSocket &getConsumer() {
+    return consumer_;
+  }
+
+  HTTPClientConnection &setTimeout(const std::chrono::seconds &timeout) {
+    timer_->cancel();
+    timer_->expires_from_now(timeout);
+    timer_->async_wait([this](std::error_code ec) {
+      if (!ec) {
+        consumer_.stop();
+      }
+    });
+
+    return *http_client_;
+  }
+
+  HTTPClientConnection &setCertificate(const std::string &cert_path) {
+    if (consumer_.setSocketOption(GeneralTransportOptions::CERTIFICATE,
+                                  cert_path) == SOCKET_OPTION_NOT_SET) {
+      throw errors::RuntimeException("Error setting the certificate.");
+    }
+
+    return *http_client_;
+  }
+
+ private:
+  void sendRequestGetReply(std::string &ipv6_first_word) {
+    const std::string &request_string = request_.getRequestString();
+    const std::string &locator = request_.getLocator();
+
+    // Hash it
+
+    uint32_t locator_hash =
+        utils::hash::fnv32_buf(locator.c_str(), locator.size());
+    uint64_t request_hash =
+        utils::hash::fnv64_buf(request_string.c_str(), request_string.size());
+
+    consumer_.setSocketOption(
+        ConsumerCallbacksOptions::INTEREST_OUTPUT,
+        (ConsumerInterestCallback)std::bind(
+            &Implementation::processLeavingInterest, this,
+            std::placeholders::_1, std::placeholders::_2));
+
+    // Factor hicn name using hash
+    name_.str("");
+
+    name_ << ipv6_first_word << ":";
+
+    for (uint16_t *word = (uint16_t *)&locator_hash;
+         std::size_t(word) <
+         (std::size_t(&locator_hash) + sizeof(locator_hash));
+         word++) {
+      name_ << ":" << std::hex << *word;
+    }
+
+    for (uint16_t *word = (uint16_t *)&request_hash;
+         std::size_t(word) <
+         (std::size_t(&request_hash) + sizeof(request_hash));
+         word++) {
+      name_ << ":" << std::hex << *word;
+    }
+
+    name_ << "|0";
+
+    consumer_.consume(Name(name_.str()));
+
+    consumer_.stop();
+  }
+
+  bool verifyData(interface::ConsumerSocket &c,
+                  const core::ContentObject &contentObject) {
+    if (contentObject.getPayloadType() == PayloadType::CONTENT_OBJECT) {
+      TRANSPORT_LOGI("VERIFY CONTENT\n");
+    } else if (contentObject.getPayloadType() == PayloadType::MANIFEST) {
+      TRANSPORT_LOGI("VERIFY MANIFEST\n");
+    }
+
+    return true;
+  }
+
+  void processLeavingInterest(interface::ConsumerSocket &c,
+                              const core::Interest &interest) {
+    if (interest.payloadSize() == 0) {
+      Interest &int2 = const_cast<Interest &>(interest);
+      auto payload = request_.getRequestString();
+      auto payload2 = request_.getPayload();
+      int2.appendPayload((uint8_t *)payload.data(), payload.size());
+      if (payload2)
+        int2.appendPayload((uint8_t *)payload2->data(), payload2->length());
+    }
+  }
+
+  // Read callback
+  bool isBufferMovable() noexcept override { return true; }
+
+  void getReadBuffer(uint8_t **application_buffer,
+                     size_t *max_length) override {}
+
+  void readDataAvailable(size_t length) noexcept override {}
+
+  size_t maxBufferSize() const override { return max_buffer_capacity; }
+
+  void readBufferAvailable(
+      std::unique_ptr<utils::MemBuf> &&buffer) noexcept override {
+    if (!read_bytes_callback_) {
+      response_->appendResponseChunk(std::move(buffer));
+    } else {
+      read_bytes_callback_->onBytesReceived(std::move(buffer));
+    }
+  }
+
+  void readError(const std::error_code ec) noexcept override {
+    TRANSPORT_LOGE("Error %s during download of %s", ec.message().c_str(),
+                   current_url_.c_str());
+    if (read_bytes_callback_) {
+      read_bytes_callback_->onError(ec);
+    }
+
+    return_code_ = HTTPClientConnection::RC::DOWNLOAD_FAILED;
+  }
+
+  void readSuccess(std::size_t total_size) noexcept override {
+    success_callback_(total_size);
+    if (read_bytes_callback_) {
+      read_bytes_callback_->onSuccess(total_size);
+    }
+
+    return_code_ = HTTPClientConnection::RC::DOWNLOAD_SUCCESS;
+  }
+
+  HTTPClientConnection *http_client_;
+
+  // The consumer socket
+  ConsumerSocket consumer_;
+
+  // The current url provided by the application
+  std::string current_url_;
+  // The current hICN name used for downloading
+  std::stringstream name_;
+  // Function to be called when the read is successful
+  std::function<void(std::size_t)> success_callback_;
+  // Return code for current download
+  RC return_code_;
+
+  // Application provided callback for saving the received content during
+  // the download. If this callback is used, the HTTPClient will NOT save
+  // any byte internally.
+  ReadBytesCallback *read_bytes_callback_;
+
+  HTTPRequest request_;
+
+  // Internal read buffer and HTTP response, to be used if the application does
+  // not provide any read_bytes_callback
+  std::unique_ptr<utils::MemBuf> read_buffer_;
+  std::shared_ptr<HTTPResponse> response_;
+
+  // Timer
+  std::unique_ptr<asio::steady_timer> timer_;
+};
+
+HTTPClientConnection::HTTPClientConnection() {
+  implementation_ = new Implementation(this);
+}
+
+HTTPClientConnection::~HTTPClientConnection() { delete implementation_; }
+
+HTTPClientConnection::RC HTTPClientConnection::get(
+    const std::string &url, HTTPHeaders headers, HTTPPayload &&payload,
+    std::shared_ptr<HTTPResponse> response, ReadBytesCallback *callback,
+    std::string ipv6_first_word) {
+  return implementation_->get(url, headers, std::move(payload), response,
+                              callback, ipv6_first_word);
+}
+
+HTTPClientConnection::RC HTTPClientConnection::sendRequest(
+    const std::string &url, HTTPMethod method, HTTPHeaders headers,
+    HTTPPayload &&payload, std::shared_ptr<HTTPResponse> response,
+    ReadBytesCallback *callback, std::string ipv6_first_word) {
+  return implementation_->sendRequest(url, method, headers, std::move(payload),
+                                      response, callback, ipv6_first_word);
+}
+
+std::shared_ptr<HTTPResponse> HTTPClientConnection::response() {
+  return implementation_->response();
+}
+
+ConsumerSocket &HTTPClientConnection::getConsumer() {
+  return implementation_->getConsumer();
+}
+
+HTTPClientConnection &HTTPClientConnection::stop() {
+  return implementation_->stop();
+}
+
+HTTPClientConnection &HTTPClientConnection::setTimeout(
+    const std::chrono::seconds &timeout) {
+  return implementation_->setTimeout(timeout);
+}
+
+HTTPClientConnection &HTTPClientConnection::setCertificate(
+    const std::string &cert_path) {
+  return implementation_->setCertificate(cert_path);
+}
+
+}  // namespace http
+
+}  // namespace transport