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freetdm: be more tolerant to a few read errors

This commit is contained in:
Moises Silva 2011-06-07 17:35:49 -04:00
parent 2b1b19bf74
commit 1d3417a97b
1 changed files with 34 additions and 12 deletions
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44
libs/freetdm/mod_freetdm/mod_freetdm.c
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@ -42,6 +42,9 @@
#define FREETDM_VAR_PREFIX "freetdm_"
#define FREETDM_VAR_PREFIX_LEN (sizeof(FREETDM_VAR_PREFIX)-1)
/* How many consecutive IO errors before giving up */
#define FTDM_MAX_READ_WRITE_ERRORS 10
SWITCH_MODULE_LOAD_FUNCTION(mod_freetdm_load);
SWITCH_MODULE_SHUTDOWN_FUNCTION(mod_freetdm_shutdown);
SWITCH_MODULE_DEFINITION(mod_freetdm, mod_freetdm_load, mod_freetdm_shutdown, NULL);
@ -110,7 +113,8 @@ struct private_object {
switch_mutex_t *mutex;
switch_mutex_t *flag_mutex;
ftdm_channel_t *ftdmchan;
uint32_t wr_error;
uint32_t write_error;
uint32_t read_error;
};
/* private data attached to FTDM channels (only FXS for now) */
@ -624,12 +628,11 @@ static switch_status_t channel_read_frame(switch_core_session_t *session, switch
ftdm_status_t status;
int total_to;
int chunk, do_break = 0;
uint32_t span_id, chan_id;
channel = switch_core_session_get_channel(session);
assert(channel != NULL);
tech_pvt = switch_core_session_get_private(session);
assert(tech_pvt != NULL);
@ -638,6 +641,13 @@ static switch_status_t channel_read_frame(switch_core_session_t *session, switch
return SWITCH_STATUS_FALSE;
}
if (!tech_pvt->ftdmchan) {
return SWITCH_STATUS_FALSE;
}
span_id = ftdm_channel_get_span_id(tech_pvt->ftdmchan);
chan_id = ftdm_channel_get_id(tech_pvt->ftdmchan);
/* Digium Cards sometimes timeout several times in a row here.
Yes, we support digium cards, ain't we nice.......
6 double length intervals should compensate */
@ -697,9 +707,14 @@ static switch_status_t channel_read_frame(switch_core_session_t *session, switch
len = tech_pvt->read_frame.buflen;
if (ftdm_channel_read(tech_pvt->ftdmchan, tech_pvt->read_frame.data, &len) != FTDM_SUCCESS) {
ftdm_log(FTDM_LOG_WARNING, "failed to read from device\n");
ftdm_log(FTDM_LOG_WARNING, "failed to read from device %d:%d\n", span_id, chan_id);
if (++tech_pvt->read_error > FTDM_MAX_READ_WRITE_ERRORS) {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "too many I/O read errors on device %d:%d!\n", span_id, chan_id);
goto fail;
}
} else {
tech_pvt->read_error = 0;
}
*frame = &tech_pvt->read_frame;
tech_pvt->read_frame.datalen = (uint32_t)len;
@ -736,6 +751,7 @@ static switch_status_t channel_write_frame(switch_core_session_t *session, switc
ftdm_size_t len;
unsigned char data[SWITCH_RECOMMENDED_BUFFER_SIZE] = {0};
ftdm_wait_flag_t wflags = FTDM_WRITE;
uint32_t span_id, chan_id;
channel = switch_core_session_get_channel(session);
assert(channel != NULL);
@ -743,10 +759,6 @@ static switch_status_t channel_write_frame(switch_core_session_t *session, switc
tech_pvt = switch_core_session_get_private(session);
assert(tech_pvt != NULL);
if (!tech_pvt->ftdmchan) {
return SWITCH_STATUS_FALSE;
}
if (switch_test_flag(tech_pvt, TFLAG_DEAD)) {
return SWITCH_STATUS_FALSE;
}
@ -759,6 +771,14 @@ static switch_status_t channel_write_frame(switch_core_session_t *session, switc
goto fail;
}
if (!tech_pvt->ftdmchan) {
return SWITCH_STATUS_FALSE;
}
span_id = ftdm_channel_get_span_id(tech_pvt->ftdmchan);
chan_id = ftdm_channel_get_id(tech_pvt->ftdmchan);
if (switch_test_flag(frame, SFF_CNG)) {
frame->data = data;
frame->buflen = sizeof(data);
@ -779,12 +799,14 @@ static switch_status_t channel_write_frame(switch_core_session_t *session, switc
len = frame->datalen;
if (ftdm_channel_write(tech_pvt->ftdmchan, frame->data, frame->buflen, &len) != FTDM_SUCCESS) {
if (++tech_pvt->wr_error > 10) {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "too many I/O write errors!\n");
ftdm_log(FTDM_LOG_WARNING, "failed to write to device %d:%d\n", span_id, chan_id);
if (++tech_pvt->write_error > FTDM_MAX_READ_WRITE_ERRORS) {
switch_log_printf(SWITCH_CHANNEL_LOG,
SWITCH_LOG_ERROR, "too many I/O write errors on device %d:%d!\n", span_id, chan_id);
goto fail;
}
} else {
tech_pvt->wr_error = 0;
tech_pvt->write_error = 0;
}
return SWITCH_STATUS_SUCCESS;