greenplumn fetch 源码
greenplumn fetch 代码
文件路径：/src/bin/pg_rewind/fetch.c
/*-------------------------------------------------------------------------
*
* fetch.c
* Functions for fetching files from a local or remote data dir
*
* This file forms an abstraction of getting files from the "source".
* There are two implementations of this interface: one for copying files
* from a data directory via normal filesystem operations (copy_fetch.c),
* and another for fetching files from a remote server via a libpq
* connection (libpq_fetch.c)
*
*
* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
*
*-------------------------------------------------------------------------
*/
#include "postgres_fe.h"
#include <sys/stat.h>
#include <unistd.h>
#include "pg_rewind.h"
#include "fetch.h"
#include "file_ops.h"
#include "filemap.h"
void
fetchSourceFileList(void)
{
if (datadir_source)
traverse_datadir(datadir_source, &process_source_file);
else
libpqProcessFileList();
}
/*
* Fetch all relation data files that are marked in the given data page map.
*/
void
executeFileMap(void)
{
if (datadir_source)
copy_executeFileMap(filemap);
else
libpq_executeFileMap(filemap);
}
/*
* Fetch a single file into a malloc'd buffer. The file size is returned
* in *filesize. The returned buffer is always zero-terminated, which is
* handy for text files.
*/
char *
fetchFile(const char *filename, size_t *filesize)
{
if (datadir_source)
return slurpFile(datadir_source, filename, filesize);
else
return libpqGetFile(filename, filesize);
}
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