SLIOReaderFetch Class Reference

SLIOStream implementation for downloading files from a web server. More...

#include <SLIOFetch.h>

Inheritance diagram for SLIOReaderFetch:

Public Member Functions
	SLIOReaderFetch (std::string url)
	~SLIOReaderFetch ()
Public Member Functions inherited from SLIOReaderMemory
	SLIOReaderMemory (std::string path)
size_t	read (void *buffer, size_t size)
size_t	tell ()
bool	seek (size_t offset, Origin origin)
size_t	size ()
Public Member Functions inherited from SLIOStream
virtual	~SLIOStream ()=default
virtual size_t	write (const void *buffer, size_t size)
virtual void	flush ()

Static Public Member Functions
static bool	exists (std::string url)

Additional Inherited Members
Public Types inherited from SLIOStream
enum	Origin { IOO_beg , IOO_cur , IOO_end }
Protected Attributes inherited from SLIOReaderMemory
std::string	_path
size_t	_position

Detailed Description

SLIOStream implementation for downloading files from a web server.

The constructor downloads the file via HTTP and stores it in memory. When downloading, a loading screen is displayed to the user because it blocks the entire application.

Definition at line 24 of file SLIOFetch.h.

Constructor & Destructor Documentation

SLIOReaderFetch()

SLIOReaderFetch::SLIOReaderFetch

(

std::string

url

)

Definition at line 34 of file SLIOFetch.cpp.

  : SLIOReaderMemory(url)
{
    assert(pthread_self() != 0 && "Fetching is not allowed on the main thread");
 
    std::cout << "FETCH \"" << url << "\"" << std::endl;
 
    emscripten_fetch_attr_t attr;
    emscripten_fetch_attr_init(&attr);
    std::strcpy(attr.requestMethod, "GET");
    attr.attributes           = EMSCRIPTEN_FETCH_LOAD_TO_MEMORY | EMSCRIPTEN_FETCH_SYNCHRONOUS;
    emscripten_fetch_t* fetch = emscripten_fetch(&attr, url.c_str());
 
    int    status = fetch->status;
    size_t size   = (size_t)fetch->totalBytes;
    std::cout << "STATUS: " << status << ", SIZE: " << size << std::endl;
 
    if (status == 200)
    {
        SLIOMemory::set(_path, std::vector<char>(fetch->data, fetch->data + size));
    }
 
    emscripten_fetch_close(fetch);
}

~SLIOReaderFetch()

SLIOReaderFetch::~SLIOReaderFetch

(

)

Definition at line 59 of file SLIOFetch.cpp.

{
    SLIOMemory::clear(_path);
}

Member Function Documentation

exists()

bool SLIOReaderFetch::exists ( std::string  url )

static

Definition at line 19 of file SLIOFetch.cpp.

{
    assert(pthread_self() != 0 && "Fetching is not allowed on the main thread");
 
    emscripten_fetch_attr_t attr;
    emscripten_fetch_attr_init(&attr);
    std::strcpy(attr.requestMethod, "HEAD");
    attr.attributes            = EMSCRIPTEN_FETCH_SYNCHRONOUS;
    emscripten_fetch_t* fetch  = emscripten_fetch(&attr, url.c_str());
    bool                exists = fetch->status == 200;
    emscripten_fetch_close(fetch);
 
    return exists;
}

---

The documentation for this class was generated from the following files:

• SLIOFetch.h
• SLIOFetch.cpp