62 lines
2.1 KiB
C
62 lines
2.1 KiB
C
/*
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* Copyright (c) 2021 Louis Meyer and Patrick Rathje
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#ifndef ENS_RECORDS_H
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#define ENS_RECORDS_H
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#include "sequencenumber.h"
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#include "storage.h"
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typedef struct record_iterator {
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/**
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* @internal
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*/
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record_t current;
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/**
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* @internal
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*/
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record_sequence_number_t sn_next;
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/**
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* @internal
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*/
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record_sequence_number_t sn_end; // the last sn to include
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/**
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* @internal
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*/
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uint8_t finished;
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} record_iterator_t;
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// Also uses start and end from storage if NULL pointers given
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// iterate over a sequence number range of records (Null will select the latest and newest for start / end)
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// automatically
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int ens_records_iterator_init_range(record_iterator_t* iterator,
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record_sequence_number_t* opt_start,
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record_sequence_number_t* opt_end);
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// TODO: Do we guarantee that higher sequence numbers have at least our timestamp and lower sequence numbers up to our
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// timestamp?
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int ens_records_iterator_init_timerange(record_iterator_t* iterator, time_t* ts_start, time_t* ts_end);
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record_t* ens_records_iterator_next(record_iterator_t* iter);
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int ens_record_iterator_clear(record_iterator_t* iter);
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// TODO: Is a callback the easiest thing to do? -> now it is the iterator :)
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// TODO: should we really indicated the last record by sending a NULL pointer?
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typedef uint8_t (*ens_record_iterator_cb_t)(const record_t* record, void* userdata);
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enum {
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ENS_RECORD_ITER_STOP, // STOP the iteration, this would not result in a NULL callback after the end is reached
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ENS_RECORD_ITER_CONTINUE, // CONTINUE the iteration, this results in a NULL callback after the end is reached
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};
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// TODO: this function could be made asynchronous to handle delays in contact_storage reads?!
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// TODO: How can we handle iteration while records are being added or deleted? (should be safe as long as the
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// load_record function is thread safe?!)
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uint8_t ens_records_iterate_with_callback(record_iterator_t* iter, ens_record_iterator_cb_t cb, void* userdata);
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#endif
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