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wget.cpp
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wget.cpp
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/*
* @build: make examples
* @server bin/httpd -s restart -d
* @client bin/wget http://127.0.0.1:8080/
*/
#include "HttpClient.h"
#include "htime.h"
using namespace hv;
typedef std::function<void(size_t received_bytes, size_t total_bytes)> wget_progress_cb;
static int wget(const char* url, const char* filepath, wget_progress_cb progress_cb = NULL, bool use_range = true) {
int ret = 0;
HttpClient cli;
HttpRequest req;
HttpResponse resp;
// HEAD
req.method = HTTP_HEAD;
req.url = url;
ret = cli.send(&req, &resp);
if (ret != 0) {
fprintf(stderr, "HEAD request error: %d\n", ret);
return ret;
}
printd("%s", resp.Dump(true, false).c_str());
if (resp.status_code == HTTP_STATUS_NOT_FOUND) {
fprintf(stderr, "404 Not Found\n");
return 404;
}
// use Range?
int range_bytes = 1 << 20; // 1M
long from = 0, to = 0;
size_t content_length = hv::from_string<size_t>(resp.GetHeader("Content-Length"));
if (use_range) {
use_range = false;
std::string accept_ranges = resp.GetHeader("Accept-Ranges");
// use Range if server accept_ranges and content_length > 1M
if (resp.status_code == 200 &&
accept_ranges == "bytes" &&
content_length > range_bytes) {
use_range = true;
}
}
// open file
std::string filepath_download(filepath);
filepath_download = ".download";
HFile file;
if (use_range) {
ret = file.open(filepath_download.c_str(), "ab");
from = file.size();
} else {
ret = file.open(filepath_download.c_str(), "wb");
}
if (ret != 0) {
fprintf(stderr, "Failed to open file %s\n", filepath_download.c_str());
return ret;
}
printf("Save file to %s ...\n", filepath);
// GET
req.method = HTTP_GET;
req.timeout = 3600; // 1h
if (!use_range) {
size_t received_bytes = 0;
req.http_cb = [&file, &content_length, &received_bytes, &progress_cb]
(HttpMessage* resp, http_parser_state state, const char* data, size_t size) {
if (!resp->headers["Location"].empty()) return;
if (state == HP_HEADERS_COMPLETE) {
content_length = hv::from_string<size_t>(resp->GetHeader("Content-Length"));
printd("%s", resp->Dump(true, false).c_str());
} else if (state == HP_BODY) {
if (data && size) {
file.write(data, size);
received_bytes = size;
if (progress_cb) {
progress_cb(received_bytes, content_length);
}
}
}
};
ret = cli.send(&req, &resp);
if (ret != 0) {
fprintf(stderr, "GET request error: %d\n", ret);
goto error;
}
goto success;
}
// Range: bytes=from-to
while (from < content_length) {
to = from range_bytes - 1;
if (to >= content_length) to = content_length - 1;
req.SetRange(from, to);
printd("%s", req.Dump(true, false).c_str());
ret = cli.send(&req, &resp);
if (ret != 0) {
fprintf(stderr, "GET Range: bytes=%ld-%ld request error: %d\n", from, to, ret);
goto error;
}
printd("%s", resp.Dump(true, false).c_str());
file.write(resp.body.data(), resp.body.size());
// fix: resp.body.size != range_bytes on some server
// from = to 1;
from = resp.body.size();
if (progress_cb) {
progress_cb(from, content_length);
}
}
success:
file.close();
ret = file.rename(filepath);
if (ret != 0) {
fprintf(stderr, "mv %s => %s failed: %s:%d\n", filepath_download.c_str(), filepath, strerror(ret), ret);
}
return ret;
error:
file.close();
// file.remove();
return ret;
}
int main(int argc, char** argv) {
if (argc < 2) {
printf("Usage: %s [--use_range] url [filepath]\n", argv[0]);
return -10;
}
int idx = 1;
bool use_range = false;
if (strcmp(argv[idx], "--use_range") == 0) {
use_range = true;
idx;
}
const char* url = argv[idx ];
const char* filepath = "index.html";
if (argv[idx]) {
filepath = argv[idx];
} else {
const char* path = strrchr(url, '/');
if (path && path[1]) {
filepath = path 1;
}
}
unsigned int start_time = gettick_ms();
int last_progress = 0;
wget(url, filepath, [&last_progress](size_t received_bytes, size_t total_bytes) {
// print progress
if (total_bytes == 0) {
printf("\rprogress: %lu/? = ?", (unsigned long)received_bytes);
} else {
int cur_progress = received_bytes * 100 / total_bytes;
if (cur_progress > last_progress) {
printf("\rprogress: %lu/%lu = %d%%", (unsigned long)received_bytes, (unsigned long)total_bytes, (int)cur_progress);
last_progress = cur_progress;
}
}
fflush(stdout);
}, use_range);
unsigned int end_time = gettick_ms();
unsigned int cost_time = end_time - start_time;
printf("\ncost time %u ms\n", cost_time);
// 1B/ms = 1KB/s = 8Kbps
printf("download rate = %lu KB/s\n", (unsigned long)hv_filesize(filepath) / cost_time);
return 0;
}