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/* Copyright (c) 2002-2018 Dovecot authors, see the included COPYING file */
#include "lib.h"
#include "buffer.h"
#include "str.h"
#include "iostream-pump.h"
#include "istream.h"
#include "ostream.h"
#include <unistd.h>
#undef iostream_pump_set_completion_callback
struct iostream_pump {
int refcount;
struct istream *input;
struct ostream *output;
struct io *io;
iostream_pump_callback_t *callback;
void *context;
bool waiting_output;
bool completed;
};
static void iostream_pump_copy(struct iostream_pump *pump)
{
enum ostream_send_istream_result res;
size_t old_size;
o_stream_cork(pump->output);
old_size = o_stream_get_max_buffer_size(pump->output);
o_stream_set_max_buffer_size(pump->output,
I_MIN(IO_BLOCK_SIZE,
o_stream_get_max_buffer_size(pump->output)));
res = o_stream_send_istream(pump->output, pump->input);
o_stream_set_max_buffer_size(pump->output, old_size);
o_stream_uncork(pump->output);
switch(res) {
case OSTREAM_SEND_ISTREAM_RESULT_ERROR_INPUT:
io_remove(&pump->io);
pump->callback(IOSTREAM_PUMP_STATUS_INPUT_ERROR,
pump->context);
return;
case OSTREAM_SEND_ISTREAM_RESULT_ERROR_OUTPUT:
io_remove(&pump->io);
pump->callback(IOSTREAM_PUMP_STATUS_OUTPUT_ERROR,
pump->context);
return;
case OSTREAM_SEND_ISTREAM_RESULT_WAIT_OUTPUT:
i_assert(!pump->output->blocking);
pump->waiting_output = TRUE;
io_remove(&pump->io);
return;
case OSTREAM_SEND_ISTREAM_RESULT_FINISHED:
pump->waiting_output = FALSE;
io_remove(&pump->io);
/* flush it */
switch (o_stream_flush(pump->output)) {
case -1:
pump->callback(IOSTREAM_PUMP_STATUS_OUTPUT_ERROR,
pump->context);
break;
case 0:
pump->waiting_output = TRUE;
pump->completed = TRUE;
break;
default:
pump->callback(IOSTREAM_PUMP_STATUS_INPUT_EOF,
pump->context);
break;
}
return;
case OSTREAM_SEND_ISTREAM_RESULT_WAIT_INPUT:
i_assert(!pump->input->blocking);
pump->waiting_output = FALSE;
return;
}
i_unreached();
}
static int iostream_pump_flush(struct iostream_pump *pump)
{
int ret;
if ((ret = o_stream_flush(pump->output)) <= 0) {
if (ret < 0) {
pump->callback(IOSTREAM_PUMP_STATUS_OUTPUT_ERROR,
pump->context);
}
return ret;
}
pump->waiting_output = FALSE;
if (pump->completed) {
pump->callback(IOSTREAM_PUMP_STATUS_INPUT_EOF, pump->context);
return 1;
}
if (pump->input->blocking)
iostream_pump_copy(pump);
else if (pump->io == NULL) {
pump->io = io_add_istream(pump->input,
iostream_pump_copy, pump);
io_set_pending(pump->io);
}
return ret;
}
struct iostream_pump *
iostream_pump_create(struct istream *input, struct ostream *output)
{
struct iostream_pump *pump;
i_assert(input != NULL &&
output != NULL);
i_assert(!input->blocking || !output->blocking);
/* ref streams */
i_stream_ref(input);
o_stream_ref(output);
/* create pump */
pump = i_new(struct iostream_pump, 1);
pump->refcount = 1;
pump->input = input;
pump->output = output;
return pump;
}
void iostream_pump_start(struct iostream_pump *pump)
{
i_assert(pump != NULL);
i_assert(pump->callback != NULL);
/* add flush handler */
if (!pump->output->blocking) {
o_stream_set_flush_callback(pump->output,
iostream_pump_flush, pump);
}
/* make IO objects */
if (pump->input->blocking) {
i_assert(!pump->output->blocking);
o_stream_set_flush_pending(pump->output, TRUE);
} else {
pump->io = io_add_istream(pump->input,
iostream_pump_copy, pump);
io_set_pending(pump->io);
}
}
struct istream *iostream_pump_get_input(struct iostream_pump *pump)
{
i_assert(pump != NULL);
return pump->input;
}
struct ostream *iostream_pump_get_output(struct iostream_pump *pump)
{
i_assert(pump != NULL);
return pump->output;
}
void iostream_pump_set_completion_callback(struct iostream_pump *pump,
iostream_pump_callback_t *callback,
void *context)
{
i_assert(pump != NULL);
pump->callback = callback;
pump->context = context;
}
void iostream_pump_ref(struct iostream_pump *pump)
{
i_assert(pump != NULL);
i_assert(pump->refcount > 0);
pump->refcount++;
}
void iostream_pump_unref(struct iostream_pump **_pump)
{
i_assert(_pump != NULL);
struct iostream_pump *pump = *_pump;
if (pump == NULL)
return;
i_assert(pump->refcount > 0);
*_pump = NULL;
if (--pump->refcount > 0)
return;
iostream_pump_stop(pump);
o_stream_unref(&pump->output);
i_stream_unref(&pump->input);
i_free(pump);
}
void iostream_pump_destroy(struct iostream_pump **_pump)
{
i_assert(_pump != NULL);
struct iostream_pump *pump = *_pump;
if (pump == NULL)
return;
*_pump = NULL;
iostream_pump_stop(pump);
o_stream_unref(&pump->output);
i_stream_unref(&pump->input);
iostream_pump_unref(&pump);
}
void iostream_pump_stop(struct iostream_pump *pump)
{
i_assert(pump != NULL);
if (pump->output != NULL)
o_stream_unset_flush_callback(pump->output);
io_remove(&pump->io);
}
bool iostream_pump_is_waiting_output(struct iostream_pump *pump)
{
return pump->waiting_output;
}
void iostream_pump_switch_ioloop_to(struct iostream_pump *pump,
struct ioloop *ioloop)
{
i_assert(pump != NULL);
if (pump->io != NULL)
pump->io = io_loop_move_io_to(ioloop, &pump->io);
o_stream_switch_ioloop_to(pump->output, ioloop);
i_stream_switch_ioloop_to(pump->input, ioloop);
}
void iostream_pump_switch_ioloop(struct iostream_pump *pump)
{
iostream_pump_switch_ioloop_to(pump, current_ioloop);
}
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