[HICN-528] Add progress bar to higet.

Change-Id: I645ef2b8834f4310933793fb1f59e8f37e3d6aef
Signed-off-by: Mauro Sardara <msardara@cisco.com>

1 files changed, 166 insertions, 46 deletions

diff --git a/apps/higet/higet.cc b/apps/higet/higet.cc
index fa19528f8..df34d5c14 100644
--- a/apps/higet/higet.cc
+++ b/apps/higet/higet.cc
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019 Cisco and/or its affiliates.
+ * Copyright (c) 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:
@@ -8,14 +8,19 @@
  *
  * 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.
+ * 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/http/client_connection.h>
-
 #include <fstream>
+#include <map>
+
+#ifndef ASIO_STANDALONE
+#define ASIO_STANDALONE
+#include <asio.hpp>
+#endif
 
 typedef std::chrono::time_point<std::chrono::system_clock> Time;
 typedef std::chrono::milliseconds TimeDuration;
@@ -34,61 +39,160 @@ typedef struct {
   std::string ipv6_first_word;
 } Configuration;
 
-void processResponse(Configuration &conf,
-                     transport::http::HTTPResponse &&response) {
-  auto &payload = response.getPayload();
+class ReadBytesCallbackImplementation
+    : public transport::http::HTTPClientConnection::ReadBytesCallback {
+ public:
+  ReadBytesCallbackImplementation(std::string file_name, long yet_downloaded)
+      : file_name_(file_name),
+        temp_file_name_(file_name_ + ".temp"),
+        yet_downloaded_(yet_downloaded),
+        byte_downloaded_(yet_downloaded),
+        work_(std::make_unique<asio::io_service::work>(io_service_)),
+        thread_(
+            std::make_unique<std::thread>([this]() { io_service_.run(); })) {
+    std::streambuf *buf;
+    if (file_name_ != "-") {
+      of_.open(temp_file_name_, std::ofstream::binary | std::ofstream::app);
+      buf = of_.rdbuf();
+    } else {
+      buf = std::cout.rdbuf();
+    }
 
-  if (conf.file_name != "-") {
-    std::cerr << "Saving to: " << conf.file_name << " " << payload.size()
-              << "kB" << std::endl;
+    out_ = new std::ostream(buf);
   }
 
-  Time t3 = std::chrono::system_clock::now();
+  ~ReadBytesCallbackImplementation() {
+    if (thread_->joinable()) {
+      thread_->join();
+    }
+  }
 
-  std::streambuf *buf;
-  std::ofstream of;
+  void onBytesReceived(std::unique_ptr<utils::MemBuf> &&buffer) {
+    auto buffer_ptr = buffer.release();
+    io_service_.post([this, buffer_ptr]() {
+      auto buffer = std::unique_ptr<utils::MemBuf>(buffer_ptr);
+      if (!first_chunk_read_) {
+        transport::http::HTTPResponse http_response(std::move(buffer));
+        auto payload = http_response.getPayload();
+        auto header = http_response.getHeaders();
+        std::map<std::string, std::string>::iterator it =
+            header.find("Content-Length");
+        if (it != header.end()) {
+          content_size_ = yet_downloaded_ + std::stol(it->second);
+        }
+        out_->write((char *)payload->data(), payload->length());
+        first_chunk_read_ = true;
+        byte_downloaded_ += payload->length();
+      } else {
+        out_->write((char *)buffer->data(), buffer->length());
+        byte_downloaded_ += buffer->length();
+      }
+
+      if (file_name_ != "-") {
+        print_bar(byte_downloaded_, content_size_, false);
+      }
+    });
+  }
 
-  if (conf.file_name != "-") {
-    of.open(conf.file_name, std::ofstream::binary);
-    buf = of.rdbuf();
-  } else {
-    buf = std::cout.rdbuf();
+  void onSuccess(std::size_t bytes) {
+    io_service_.post([this, bytes]() {
+      if (file_name_ != "-") {
+        of_.close();
+        delete out_;
+        std::size_t found = file_name_.find_last_of(".");
+        std::string name = file_name_.substr(0, found);
+        std::string extension = file_name_.substr(found + 1);
+        if (!exists_file(file_name_)) {
+          std::rename(temp_file_name_.c_str(), file_name_.c_str());
+        } else {
+          int i = 1;
+          std::ostringstream sstream;
+          sstream << name << "(" << i << ")." << extension;
+          std::string final_name = sstream.str();
+          while (exists_file(final_name)) {
+            i++;
+            sstream.str("");
+            sstream << name << "(" << i << ")." << extension;
+            final_name = sstream.str();
+          }
+          std::rename(temp_file_name_.c_str(), final_name.c_str());
+        }
+
+        print_bar(100, 100, true);
+        std::cout << "\nDownloaded " << bytes << " bytes" << std::endl;
+      }
+      work_.reset();
+    });
   }
 
-  std::ostream out(buf);
+  void onError(const std::error_code ec) {
+    io_service_.post([this]() {
+      of_.close();
+      delete out_;
+      work_.reset();
+    });
+  }
+
+ private:
+  bool exists_file(const std::string &name) {
+    std::ifstream f(name.c_str());
+    return f.good();
+  }
 
-  if (conf.print_headers) {
-    auto &headers = response.getHeaders();
-    out << "HTTP/" << response.getHttpVersion() << " "
-        << response.getStatusCode() << " " << response.getStatusString()
-        << "\n";
-    for (auto &h : headers) {
-      out << h.first << ": " << h.second << "\n";
+  void print_bar(long value, long max_value, bool last) {
+    float progress = (float)value / max_value;
+    struct winsize size;
+    ioctl(STDOUT_FILENO, TIOCGWINSZ, &size);
+    int barWidth = size.ws_col - 8;
+
+    std::cout << "[";
+    int pos = barWidth * progress;
+    for (int i = 0; i < barWidth; ++i) {
+      if (i < pos) {
+        std::cout << "=";
+      } else if (i == pos) {
+        std::cout << ">";
+      } else {
+        std::cout << " ";
+      }
+    }
+    if (last) {
+      std::cout << "] " << int(progress * 100.0) << " %" << std::endl
+                << std::endl;
+    } else {
+      std::cout << "] " << int(progress * 100.0) << " %\r";
+      std::cout.flush();
     }
-    out << "\n";
   }
 
-  out.write((char *)payload.data(), payload.size());
-  of.close();
-
-  Time t2 = std::chrono::system_clock::now();
-  TimeDuration dt =
-      std::chrono::duration_cast<std::chrono::milliseconds>(t2 - t1);
-  TimeDuration dt3 =
-      std::chrono::duration_cast<std::chrono::milliseconds>(t3 - t1);
-  long msec = (long)dt.count();
-  long msec3 = (long)dt3.count();
-  std::cerr << "Elapsed Time: " << msec / 1000.0 << " seconds -- "
-            << payload.size() * 8 / msec / 1000.0 << "[Mbps] -- "
-            << payload.size() * 8 / msec3 / 1000.0 << "[Mbps]" << std::endl;
+ private:
+  std::string file_name_;
+  std::string temp_file_name_;
+  std::ostream *out_;
+  std::ofstream of_;
+  long yet_downloaded_;
+  long content_size_;
+  bool first_chunk_read_ = false;
+  long byte_downloaded_ = 0;
+  asio::io_service io_service_;
+  std::unique_ptr<asio::io_service::work> work_;
+  std::unique_ptr<std::thread> thread_;
+};
+
+long checkFileStatus(std::string file_name) {
+  struct stat stat_buf;
+  std::string temp_file_name_ = file_name + ".temp";
+  int rc = stat(temp_file_name_.c_str(), &stat_buf);
+  return rc == 0 ? stat_buf.st_size : -1;
 }
 
 void usage(char *program_name) {
   std::cerr << "usage:" << std::endl;
   std::cerr << program_name << " [option]... [url]..." << std::endl;
   std::cerr << program_name << "options:" << std::endl;
-  std::cerr << "-O <output_path>            = write documents to <output_file>"
-            << std::endl;
+  std::cerr
+      << "-O <out_put_path>            = write documents to <out_put_file>"
+      << std::endl;
   std::cerr << "-S                          = print server response"
             << std::endl;
   std::cerr << "-P                          = first word of the ipv6 name of "
@@ -145,10 +249,23 @@ int main(int argc, char **argv) {
     conf.file_name = name.substr(1 + name.find_last_of("/"));
   }
 
-  std::map<std::string, std::string> headers = {{"Host", "localhost"},
-                                                {"User-Agent", "higet/1.0"},
-                                                {"Connection", "Keep-Alive"}};
+  long yetDownloaded = checkFileStatus(conf.file_name);
 
+  std::map<std::string, std::string> headers;
+  if (yetDownloaded == -1) {
+    headers = {{"Host", "localhost"},
+               {"User-Agent", "higet/1.0"},
+               {"Connection", "Keep-Alive"}};
+  } else {
+    std::string range;
+    range.append("bytes=");
+    range.append(std::to_string(yetDownloaded));
+    range.append("-");
+    headers = {{"Host", "localhost"},
+               {"User-Agent", "higet/1.0"},
+               {"Connection", "Keep-Alive"},
+               {"Range", range}};
+  }
   transport::http::HTTPClientConnection connection;
   if (!conf.producer_certificate.empty()) {
     connection.setCertificate(conf.producer_certificate);
@@ -156,8 +273,11 @@ int main(int argc, char **argv) {
 
   t1 = std::chrono::system_clock::now();
 
-  connection.get(name, headers, {}, nullptr, nullptr, conf.ipv6_first_word);
-  processResponse(conf, connection.response());
+  http::ReadBytesCallbackImplementation readBytesCallback(conf.file_name,
+                                                          yetDownloaded);
+
+  connection.get(name, headers, {}, nullptr, &readBytesCallback,
+                 conf.ipv6_first_word);
 
 #ifdef _WIN32
   WSACleanup();