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5135658805
And fix up gossip_store backwards comment! Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
81 lines
2.3 KiB
C
81 lines
2.3 KiB
C
#ifndef LIGHTNING_COMMON_GOSSIP_STORE_H
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#define LIGHTNING_COMMON_GOSSIP_STORE_H
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#include "config.h"
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#include <ccan/endian/endian.h>
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#include <ccan/short_types/short_types.h>
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#include <ccan/tal/tal.h>
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struct gossip_state;
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struct gossip_rcvd_filter;
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/**
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* gossip_store -- On-disk storage related information
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*/
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/* First byte of file is the version.
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*
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* Top three bits mean incompatible change.
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* As of this writing, major == 0, minor == 13.
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*/
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#define GOSSIP_STORE_MAJOR_VERSION_MASK 0xE0
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#define GOSSIP_STORE_MINOR_VERSION_MASK 0x1F
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/* Extract version from first byte */
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#define GOSSIP_STORE_MAJOR_VERSION(verbyte) (((u8)(verbyte)) >> 5)
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#define GOSSIP_STORE_MINOR_VERSION(verbyte) ((verbyte) & GOSSIP_STORE_MINOR_VERSION_MASK)
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/**
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* Bit of flags we use to mark a deleted record.
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*/
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#define GOSSIP_STORE_DELETED_BIT 0x8000U
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/**
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* Bit of flags we use to mark an important record.
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*/
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#define GOSSIP_STORE_PUSH_BIT 0x4000U
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/**
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* Bit of flags used to mark a channel announcement closed (not deleted for 12 blocks)
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*/
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#define GOSSIP_STORE_DYING_BIT 0x0800U
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/**
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* gossip_hdr -- On-disk format header.
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*/
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struct gossip_hdr {
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beint16_t flags; /* GOSSIP_STORE_xxx_BIT flags. */
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beint16_t len; /* Length of message after header. */
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beint32_t crc; /* crc of message of timestamp, after header. */
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beint32_t timestamp; /* timestamp of msg. */
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};
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/**
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* Direct store accessor: read gossip msg hdr from store.
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* @gossip_store_fd: the readable file descriptor
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* @off: the offset to read
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* @len (out): the length of the message (not including header)
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* @timestamp (out): if non-NULL, set to the timestamp.
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* @flags (out): if non-NULL, set to the flags.
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* @type (out): if non-NULL, set to the msg type.
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*
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* Returns false if there are no more gossip msgs. If you
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* want to read the message, use gossip_store_next, if you
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* want to skip, simply add sizeof(gossip_hdr) + *len to *off.
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* Note: it's possible that entire record isn't there yet,
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* so gossip_store_next can fail.
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*/
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bool gossip_store_readhdr(int gossip_store_fd, size_t off,
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size_t *len,
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u32 *timestamp,
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u16 *flags,
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u16 *type);
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/**
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* Gossipd will be writing to this, and it's not atomic! Safest
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* way to find the "end" is to walk through.
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* @old_end: 1 if no previous end.
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*/
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size_t find_gossip_store_end(int gossip_store_fd, size_t old_end);
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#endif /* LIGHTNING_COMMON_GOSSIP_STORE_H */
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