acl/app/wizard_demo/httpd_download/http_servlet.cpp

#include "stdafx.h"
#include "http_servlet.h"

http_servlet::http_servlet(const char* filepath)
{
	if (filepath && *filepath)
		filepath_ = filepath;
}

http_servlet::~http_servlet(void)
{

}

bool http_servlet::reply(acl::HttpServletRequest& req,
	acl::HttpServletResponse& res, int status, const char* fmt, ...)
{
	va_list ap;
	va_start(ap, fmt);
	acl::string  buf;
	buf.vformat(fmt, ap);
	va_end(ap);
	bool keep_alive = req.isKeepAlive();
	res.setStatus(status)
		.setKeepAlive(keep_alive)
		.setContentType("text/html; charset=utf-8")
		.setContentLength(buf.length());
	return res.write(buf) && keep_alive;
}

bool http_servlet::doError(acl::HttpServletRequest& req,
	acl::HttpServletResponse& res)
{
	acl::string hdr;
	req.getClient()->sprint_header(hdr);
	logger("error request head:\r\n%s\r\n", hdr.c_str());

	(void) reply(req, res, 400, "unknown request method\r\n");
	return false;
}

bool http_servlet::doUnknown(acl::HttpServletRequest& req,
	acl::HttpServletResponse& res)
{
	acl::string hdr;
	req.getClient()->sprint_header(hdr);
	logger("request head:\r\n%s\r\n", hdr.c_str());

	(void) reply(req, res, 400, "unknown request method\r\n");
	return false;
}

bool http_servlet::doGet(acl::HttpServletRequest& req,
	acl::HttpServletResponse& res)
{
	return doPost(req, res);
}

bool http_servlet::doPost(acl::HttpServletRequest& req,
	acl::HttpServletResponse& res)
{
	// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫ http session <20><><EFBFBD>ƣ<EFBFBD><C6A3><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ע<EFBFBD>ͣ<EFBFBD><CDA3><EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD><D2AA>֤
	// <20><> master_service.cpp <20>ĺ<EFBFBD><C4BA><EFBFBD> thread_on_read <20><><EFBFBD><EFBFBD><EFBFBD>õ<EFBFBD>
	// memcached <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	/*
	const char* sid = req.getSession().getAttribute("sid");
	if (*sid == 0)
		req.getSession().setAttribute("sid", "xxxxxx");
	sid = req.getSession().getAttribute("sid");
	*/

	// <20><><EFBFBD>ԣ<EFBFBD><D4A3><EFBFBD><EFBFBD>ͻ<EFBFBD><CDBB><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͷ<EFBFBD><CDB7>¼<EFBFBD><C2BC><EFBFBD><EFBFBD>־<EFBFBD><D6BE>
	acl::string hdr;
	req.getClient()->sprint_header(hdr);
	logger("request head:\r\n%s\r\n", hdr.c_str());

	long long int range_from, range_to;
	if (req.getRange(range_from, range_to) == false)
		return transfer_file(req, res);
	else
		return transfer_file(req, res, range_from, range_to);
}

// <20><>ͨ<EFBFBD><CDA8><EFBFBD>ع<EFBFBD><D8B9><EFBFBD>
bool http_servlet::transfer_file(acl::HttpServletRequest& req,
	acl::HttpServletResponse& res)
{
	acl::ifstream in;

	// ֻ<><D6BB><EFBFBD><EFBFBD>ʽ<EFBFBD><CABD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><C4BC><EFBFBD>
	if (in.open_read(filepath_) == false)
	{
		logger_error("open file %s error %s", filepath_.c_str(),
			acl::last_serror());
		return reply(req, res, 500, "open %s error %s",
				filepath_.c_str(), acl::last_serror());
	}

	long long int fsize = in.fsize();
	if (fsize <= 0)
		return reply(req, res, 500, "invalid file size: %lld", fsize);

	bool keep_alive = req.isKeepAlive();

	acl::string hdr_entry;
	acl::string filename;
	filename.basename(in.file_path());  // <20><><EFBFBD>ļ<EFBFBD>ȫ·<C8AB><C2B7><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȡ<EFBFBD>ļ<EFBFBD><C4BC><EFBFBD>
	hdr_entry.format("attachment;filename=\"%s\"", filename.c_str());

	// <20><><EFBFBD><EFBFBD> HTTP <20><>Ӧͷ<D3A6>е<EFBFBD><D0B5>ֶ<EFBFBD>
	res.setStatus(200)
		.setKeepAlive(keep_alive)
		.setContentLength(fsize)
		.setContentType("application/octet-stream")
		// <20><><EFBFBD><EFBFBD> HTTP ͷ<>е<EFBFBD><D0B5>ļ<EFBFBD><C4BC><EFBFBD>
		.setHeader("Content-Disposition", hdr_entry.c_str());

	acl::string hdr;
	res.getHttpHeader().build_response(hdr);
	logger("response head:\r\n%s\r\n", hdr.c_str());

	long long n = 0;
	char  buf[8192];

	// <20><><EFBFBD>ļ<EFBFBD><C4BC><EFBFBD><EFBFBD>ж<EFBFBD>ȡ<EFBFBD><C8A1><EFBFBD>ݲ<EFBFBD><DDB2><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݷ<EFBFBD><DDB7><EFBFBD><EFBFBD>ͻ<EFBFBD><CDBB><EFBFBD>
	while (!in.eof())
	{
		int ret = in.read(buf, sizeof(buf), false);
		if (ret == -1)
			break;
		if (res.write(buf, ret) == false)
			return false;
		n += ret;
		//acl_doze(100);  // <20><>Ϣ 100 ms <20><><EFBFBD>ڲ<EFBFBD><DAB2><EFBFBD>
	}

	return n == fsize ? true : false;
}

// ֧<>ֶϵ<D6B6><CFB5><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݴ<EFBFBD><DDB4><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
bool http_servlet::transfer_file(acl::HttpServletRequest& req,
	acl::HttpServletResponse& res,
	long long range_from, long long range_to)
{
	if (range_from < 0)
		return reply(req, res, 400, "invalid range_from: %lld",
				range_from);
	if (range_to > 0 && range_to < range_from)
		return reply(req, res, 400, "range_from(%lld) > range_to(%lld)",
				range_from, range_to);

	long long length;
	if (range_to >= range_from)
		length = range_to - range_from + 1;
	else
		length = -1;

	acl::ifstream in;
	// ֻ<><D6BB><EFBFBD><EFBFBD>ʽ<EFBFBD><CABD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><C4BC><EFBFBD>
	if (in.open_read(filepath_) == false)
	{
		logger_error("open file %s error %s", filepath_.c_str(),
			acl::last_serror());
		return reply(req, res, 500, "open %s error %s",
			filepath_.c_str(), acl::last_serror());
	}

	long long int fsize = in.fsize();
	if (fsize <= 0)
		return reply(req, res, 500, "invalid file size: %lld", fsize);

	// <20><><EFBFBD><EFBFBD>ƫ<EFBFBD><C6AB>λ<EFBFBD>ó<EFBFBD><C3B3><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><C4BC>ܳ<EFBFBD><DCB3>ȣ<EFBFBD><C8A3>򷵻ش<F2B7B5BB><D8B4><EFBFBD>
	if (range_to >= fsize)
		return reply(req, res, 400, "range_to(%lld) >= fsize(%lld)",
			range_to, fsize);

	// <20><><EFBFBD><EFBFBD><EFBFBD>ͻ<EFBFBD><CDBB><EFBFBD>Ҫ<EFBFBD><D2AA><EFBFBD><EFBFBD>ָ<EFBFBD><D6B8>ƫ<EFBFBD><C6AB>λ<EFBFBD><CEBB><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD>β<EFBFBD><CEB2><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>¼<EFBFBD><C2BC><EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD><D2AA>ȡ<EFBFBD><C8A1><EFBFBD><EFBFBD><EFBFBD>ݳ<EFBFBD><DDB3>ȣ<EFBFBD>
	// <20><>ֵ<EFBFBD><D6B5>Ϊʵ<CEAA><CAB5>Ҫ<EFBFBD><D2AA><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͻ<EFBFBD><CDBB>˵ij<CBB5><C4B3><EFBFBD>
	if (length == -1)
		length = fsize - range_from;

	// <20><>λ<EFBFBD>ļ<EFBFBD>ƫ<EFBFBD><C6AB>λ<EFBFBD><CEBB>
	if (in.fseek(range_from, SEEK_SET) < 0)
		return reply(req, res, 500, "fseek(%lld) error %s",
			range_from, acl::last_serror());

	bool keep_alive = req.isKeepAlive();

	acl::string hdr_entry;
	acl::string filename;
	filename.basename(in.file_path());  // <20><><EFBFBD>ļ<EFBFBD>ȫ·<C8AB><C2B7><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȡ<EFBFBD>ļ<EFBFBD><C4BC><EFBFBD>
	hdr_entry.format("attachment;filename=\"%s\"", filename.c_str());

	// <20><><EFBFBD><EFBFBD> HTTP <20><>Ӧͷ<D3A6>е<EFBFBD><D0B5>ֶ<EFBFBD>
	res.setStatus(206)			// <20><>Ӧ״̬ 206 <20><>ʾ<EFBFBD><CABE><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
		.setKeepAlive(keep_alive)	// <20>Ƿ񱣳ֳ<F1B1A3B3><D6B3><EFBFBD><EFBFBD><EFBFBD>
		.setContentLength(length)	// ʵ<><CAB5>Ҫ<EFBFBD><D2AA><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݳ<EFBFBD><DDB3><EFBFBD>
		.setContentType("application/octet-stream")  // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
		// <20><><EFBFBD><EFBFBD> HTTP ͷ<>е<EFBFBD><D0B5>ļ<EFBFBD><C4BC><EFBFBD>
		.setHeader("Content-Disposition", hdr_entry.c_str())
		// <20><><EFBFBD>ñ<EFBFBD><C3B1>δ<EFBFBD><CEB4><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʼƫ<CABC><C6AB>λ<EFBFBD>ü<EFBFBD><C3BC><EFBFBD><EFBFBD>ݵ<EFBFBD><DDB5>ܳ<EFBFBD><DCB3><EFBFBD>
		.setRange(range_from, range_to > 0
				? range_to : fsize - 1, fsize);
	
	// <20><><EFBFBD>ԣ<EFBFBD><D4A3><EFBFBD> HTTP <20><>Ӧͷ<D3A6><CDB7><EFBFBD>ڱ<EFBFBD><DAB1><EFBFBD><EFBFBD><EFBFBD>־<EFBFBD><D6BE>
	acl::string hdr;
	res.getHttpHeader().build_response(hdr);
	logger("response head:\r\n%s\r\n", hdr.c_str());

	char  buf[8192];
	int   ret;
	size_t size;

	// <20><><EFBFBD>ļ<EFBFBD>ָ<EFBFBD><D6B8>λ<EFBFBD>ö<EFBFBD>ȡ<EFBFBD><C8A1><EFBFBD>ݣ<EFBFBD><DDA3><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݴ<EFBFBD><DDB4><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͻ<EFBFBD><CDBB><EFBFBD>
	while (!in.eof() && length > 0)
	{
		size = sizeof(buf) > (size_t) length ?
				(size_t) length : sizeof(buf);

		// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ false <20><>ʾ<EFBFBD><CABE><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD>ζ<EFBFBD><CEB6><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ش<EFBFBD><D8B4><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ٷ<EFBFBD><D9B7><EFBFBD>
		ret = in.read(buf, size, false);
		if (ret == -1)
		{
			printf("read over: %s\r\n", acl::last_serror());
			break;
		}
		if (res.write(buf, ret) == false)
			return false;
		length -= ret;
		//acl_doze(100);  // <20><>Ϣ 100 ms <20><><EFBFBD>ڲ<EFBFBD><DAB2><EFBFBD>
	}

	if (length != 0)
	{
		logger_error("read file failed");
		return false;
	}

	return true && keep_alive;
}