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/* Copyright (C) 2014 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#pragma once
#include "lib/defines.h"
#include "lib/utils.h"
#ifndef NDEBUG
/** @internal Print a debug message related to resolution. */
#define QRDEBUG(query, cls, fmt, ...) do { \
unsigned _ind = 0; \
for (struct kr_query *q = (query); q; q = q->parent, _ind += 2); \
kr_log_debug("[%s] %*s" fmt, cls, _ind, "", ## __VA_ARGS__); \
} while (0)
#else
#define QRDEBUG(query, cls, fmt, ...)
#endif
/*! Layer processing states.
* Each state represents the state machine transition,
* and determines readiness for the next action.
*/
enum kr_layer_state {
KR_STATE_NOOP = 0, /*!< N/A */
KR_STATE_CONSUME = 1 << 0, /*!< Consume data. */
KR_STATE_PRODUCE = 1 << 1, /*!< Produce data. */
KR_STATE_DONE = 1 << 2, /*!< Finished. */
KR_STATE_FAIL = 1 << 3 /*!< Error. */
};
/* Forward declarations. */
struct kr_layer_api;
/*! \brief Packet processing context. */
typedef struct kr_layer {
knot_mm_t *mm; /* Processing memory context. */
uint16_t state; /* Bitmap of enum kr_layer_state. */
void *data; /* Module specific. */
const struct kr_layer_api *api;
} kr_layer_t;
/*! \brief Packet processing module API. */
struct kr_layer_api {
int (*begin)(kr_layer_t *ctx, void *module_param);
int (*reset)(kr_layer_t *ctx);
int (*finish)(kr_layer_t *ctx);
int (*consume)(kr_layer_t *ctx, knot_pkt_t *pkt);
int (*produce)(kr_layer_t *ctx, knot_pkt_t *pkt);
int (*fail)(kr_layer_t *ctx, knot_pkt_t *pkt);
void *data;
};
typedef struct kr_layer_api kr_layer_api_t;
/** Pickled layer state (api, input, state). */
struct kr_layer_pickle {
struct kr_layer_pickle *next;
const struct kr_layer_api *api;
knot_pkt_t *pkt;
unsigned state;
};
/* Repurpose layer states. */
#define KR_STATE_YIELD KR_STATE_NOOP
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