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net: Add a simple net_io example simulating an HTTP client 

We connect to a remote host and execute a HEAD request and print the response
This commit is contained in:
Andy Williams 2017-11-22 11:41:55 +00:00
parent 9549086432
commit 8035919a32
3 changed files with 279 additions and 0 deletions
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12
reference/c/net/meson.build Normal file
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project(
'efl-reference-net', 'c',
version : '0.0.1',
default_options: [ 'c_std=gnu99', 'warning_level=2' ],
meson_version : '>= 0.38.0')
eina = dependency('eina', version : '>=1.20.99')
efl = dependency('efl-net', version : '>=1.20.99')
inc = include_directories('.')
subdir('src')

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reference/c/net/src/meson.build Normal file
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deps = [eina, efl]
executable('efl_reference_net_io',
files(['net_io.c']),
dependencies : deps,
include_directories : inc,
install : true
)

258
reference/c/net/src/net_io.c Normal file
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#define EFL_EO_API_SUPPORT 1
#define EFL_BETA_API_SUPPORT 1
#include <stdio.h>
#include <Eina.h>
#include <Efl_Net.h>
/*
* Efl.IO Networked examples.
*
* This example builds on the core_io example by connecting to a remote server
* using a dialler and a command queue.The response is printed to stdout.
*/
static Eina_List *_waiting = NULL;
static Eina_List *_commands = NULL;
static Eina_Slice _delimiter;
static Eo *_dialer = NULL, *_sender = NULL, *_receiver = NULL;
static void
_command_next(void)
{
Eina_Slice slice;
char *cmd;
Eo *send_queue;
send_queue = efl_io_copier_source_get(_sender);
if (!_commands)
{
efl_io_queue_eos_mark(send_queue);
return;
}
cmd = _commands->data;
_commands = eina_list_remove_list(_commands, _commands);
slice = (Eina_Slice)EINA_SLICE_STR(cmd);
efl_io_writer_write(send_queue, &slice, NULL);
fprintf(stderr, "INFO: sent '" EINA_SLICE_STR_FMT "'\n",
EINA_SLICE_STR_PRINT(slice));
/* don't use _delimiter directly, 'len' may be changed! */
slice = _delimiter;
efl_io_writer_write(send_queue, &slice, NULL);
}
static void
_receiver_data(void *data EINA_UNUSED, const Efl_Event *event)
{
Eina_Slice slice = efl_io_queue_slice_get(event->object);
// Can be caused when we issue efl_io_queue_clear()
if (slice.len == 0) return;
/*
* If the server didn't send us the line terminator and closed the
* connection (ie: efl_io_reader_eos_get() == true) or if the buffer
* limit was reached then we may have a line without a trailing delimiter.
*/
if (eina_slice_endswith(slice, _delimiter))
slice.len -= _delimiter.len;
fprintf(stderr, "INFO: received '" EINA_SLICE_STR_FMT "'\n",
EINA_SLICE_STR_PRINT(slice));
efl_io_queue_clear(event->object);
_command_next();
}
static void
_dialer_connected(void *data EINA_UNUSED, const Efl_Event *event)
{
fprintf(stderr, "INFO: connected to %s (%s)\n",
efl_net_dialer_address_dial_get(event->object),
efl_net_socket_address_remote_get(event->object));
_command_next();
}
static void
_copier_done(void *data EINA_UNUSED, const Efl_Event *event)
{
fprintf(stderr, "INFO: %s done\n", efl_name_get(event->object));
_waiting = eina_list_remove(_waiting, event->object);
if (!_waiting)
efl_exit(EXIT_SUCCESS);
}
static void
_copier_error(void *data EINA_UNUSED, const Efl_Event *event)
{
const Eina_Error *perr = event->info;
fprintf(stderr, "INFO: %s error: #%d '%s'\n",
efl_name_get(event->object), *perr, eina_error_msg_get(*perr));
efl_exit(EXIT_FAILURE);
}
EFL_CALLBACKS_ARRAY_DEFINE(copier_cbs,
{ EFL_IO_COPIER_EVENT_DONE, _copier_done },
{ EFL_IO_COPIER_EVENT_ERROR, _copier_error });
EAPI void
efl_pause(void *data EINA_UNUSED, const Efl_Event *ev EINA_UNUSED)
{
}
EAPI void
efl_resume(void *data EINA_UNUSED, const Efl_Event *ev EINA_UNUSED)
{
}
EAPI void
efl_terminate(void *data EINA_UNUSED, const Efl_Event *ev EINA_UNUSED)
{
if (_waiting)
{
fprintf(stderr, "ERROR: %d operations were waiting!\n",
eina_list_count(_waiting));
eina_list_free(_waiting);
_waiting = NULL;
}
if (_receiver)
{
efl_io_closer_close(_receiver);
efl_del(efl_io_copier_destination_get(_receiver));
efl_del(_receiver);
}
if (_sender)
{
efl_io_closer_close(_sender);
efl_del(efl_io_copier_source_get(_sender));
efl_del(_sender);
}
if (_dialer)
efl_del(_dialer);
}
EAPI_MAIN void
efl_main(void *data EINA_UNUSED, const Efl_Event *ev EINA_UNUSED)
{
char *address = "example.com:80";
unsigned long buffer_limit = 128;
Eina_Error err;
Eo *loop, *send_queue, *receive_queue;
_commands = eina_list_append(_commands, "HEAD / HTTP/1.1\r\nHost: example.com\r\nConnection: close\r\n\r\n");
_delimiter = (Eina_Slice)EINA_SLICE_STR("\r\n");
/*
* Without a send_queue we'd have to manually implement an
* Efl_Io_Reader object that would provide partial data when
* Efl_Io_Reader.read() is called by Efl_Io_Copier. This is
* cumbersome... we just want to write a full command and have the
* queue to handle that for us.
*
* Our example's usage is to write each command at once followed by
* the line_delimiter, then wait for a reply from the server, then
* write another.
*/
send_queue = efl_add(EFL_IO_QUEUE_CLASS, NULL,
efl_name_set(efl_added, "send_queue"),
efl_io_queue_limit_set(efl_added, buffer_limit));
if (!send_queue)
{
fprintf(stderr, "ERROR: could not create Efl_Io_Queue (send)\n");
efl_exit(EXIT_FAILURE);
}
/*
* Without a receive_queue we'd have to manually implement an
* Efl_Io_Writer object that would handle write of partial data
* with Efl_Io_Writer.write() is called by Efl_Io_Copier.
*
* For output we could have another solution as well: use NULL
* destination and handle "line" or "data" events manually,
* stealing the buffer so it doesn't grow.
*
* Our example's usage is to peek its data with slice_get() then
* clear().
*/
receive_queue = efl_add(EFL_IO_QUEUE_CLASS, NULL,
efl_name_set(efl_added, "receive_queue"),
efl_io_queue_limit_set(efl_added, buffer_limit),
efl_event_callback_add(efl_added, EFL_IO_QUEUE_EVENT_SLICE_CHANGED, _receiver_data, NULL));
if (!receive_queue)
{
fprintf(stderr, "ERROR: could not create Efl_Io_Queue (receive)\n");
efl_exit(EXIT_FAILURE);
}
/*
* From here on it's mostly the same all Efl_Io_Copier would do,
* check efl_io_copier_simple_example.c and efl_io_copier_example.c
*/
/*
* some objects such as the Efl.Io.Copier and Efl.Net.Dialer.Tcp
* depend on main loop, thus their parent must be a loop
* provider. We use the loop itself.
*/
loop = ecore_main_loop_get();
/* The TCP client to use to send/receive network data */
_dialer = efl_add(EFL_NET_DIALER_TCP_CLASS, loop,
efl_name_set(efl_added, "dialer"),
efl_event_callback_add(efl_added, EFL_NET_DIALER_EVENT_CONNECTED, _dialer_connected, NULL));
if (!_dialer)
{
fprintf(stderr, "ERROR: could not create Efl_Net_Dialer_Tcp\n");
efl_exit(EXIT_FAILURE);
}
/* sender: send_queue->network */
_sender = efl_add(EFL_IO_COPIER_CLASS, loop,
efl_name_set(efl_added, "sender"),
efl_io_copier_line_delimiter_set(efl_added, _delimiter),
efl_io_copier_source_set(efl_added, send_queue),
efl_io_copier_destination_set(efl_added, _dialer),
efl_event_callback_array_add(efl_added, copier_cbs(), NULL));
if (!_sender)
{
fprintf(stderr, "ERROR: could not create Efl_Io_Copier (sender)\n");
efl_exit(EXIT_FAILURE);
}
/* receiver: network->receive_queue */
_receiver = efl_add(EFL_IO_COPIER_CLASS, loop,
efl_name_set(efl_added, "receiver"),
efl_io_copier_line_delimiter_set(efl_added, _delimiter),
efl_io_copier_source_set(efl_added, _dialer),
efl_io_copier_destination_set(efl_added, receive_queue),
efl_event_callback_array_add(efl_added, copier_cbs(), NULL));
if (!_receiver)
{
fprintf(stderr, "ERROR: could not create Efl_Io_Copier (receiver)\n");
efl_exit(EXIT_FAILURE);
}
err = efl_net_dialer_dial(_dialer, address);
if (err)
{
fprintf(stderr, "ERROR: could not dial %s: %s\n",
address, eina_error_msg_get(err));
efl_exit(EXIT_FAILURE);
}
_waiting = eina_list_append(_waiting, _sender);
_waiting = eina_list_append(_waiting, _receiver);
}
EFL_MAIN_EX()