55 lines
1.7 KiB
C
55 lines
1.7 KiB
C
#include "trikke_transport.h"
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static bool status_is_valid(trikke_transport_status_t status)
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{
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return status >= TRIKKE_TRANSPORT_COMPLETE &&
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status <= TRIKKE_TRANSPORT_FATAL;
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}
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void trikke_transport_sender_init(trikke_transport_sender_t *sender)
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{
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if (sender != NULL) {
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sender->pending = false;
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sender->begin_retry_count = 0;
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}
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}
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trikke_transport_status_t trikke_transport_sender_step(
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trikke_transport_sender_t *sender,
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const trikke_transport_t *transport,
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const uint8_t *packet,
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size_t packet_size)
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{
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if (sender == NULL || transport == NULL || transport->begin == NULL ||
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transport->poll == NULL || packet == NULL || packet_size == 0) {
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return TRIKKE_TRANSPORT_FATAL;
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}
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const bool was_pending = sender->pending;
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const trikke_transport_status_t status = was_pending
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? transport->poll(transport->context)
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: transport->begin(transport->context, packet, packet_size);
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if (!status_is_valid(status)) {
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sender->pending = was_pending;
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return TRIKKE_TRANSPORT_FATAL;
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}
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if (status == TRIKKE_TRANSPORT_PENDING) {
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sender->pending = true;
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} else if (status == TRIKKE_TRANSPORT_COMPLETE) {
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sender->pending = false;
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} else if (status == TRIKKE_TRANSPORT_RETRY) {
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if (was_pending) {
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// Once accepted, generic transport code cannot prove that retrying
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// the whole frame is duplicate-safe. Fail closed and keep ownership.
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sender->pending = true;
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return TRIKKE_TRANSPORT_FATAL;
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}
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++sender->begin_retry_count;
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sender->pending = false;
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} else {
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sender->pending = was_pending;
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}
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return status;
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}
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