greenplumn uriparser 源码
greenplumn uriparser 代码
文件路径:/src/backend/utils/misc/uriparser.c
/*-------------------------------------------------------------------------
*
* uriparser.c
* Functions for parsing URI strings
*
* Portions Copyright (c) 2007-2008, Greenplum inc
* Portions Copyright (c) 2012-Present VMware, Inc. or its affiliates.
*
*
* IDENTIFICATION
* src/backend/utils/misc/uriparser.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "utils/uri.h"
#include <ctype.h>
#include <arpa/inet.h> /* inet_ntoa() */
/*
* ParseExternalTableUri
*
* This routines converts a string to a supported external
* table URI object. It is also used to validate the URI format.
*/
Uri *
ParseExternalTableUri(const char *uri_str)
{
Uri *uri = (Uri *) palloc0(sizeof(Uri));
char *start,
*end;
int protocol_len,
len;
uri->port = -1;
uri->hostname = NULL;
uri->path = NULL;
uri->customprotocol = NULL;
/*
* parse protocol
*/
if (IS_FILE_URI(uri_str))
{
uri->protocol = URI_FILE;
protocol_len = strlen(PROTOCOL_FILE);
}
else if (IS_FTP_URI(uri_str))
{
uri->protocol = URI_FTP;
protocol_len = strlen(PROTOCOL_FTP);
}
else if (IS_HTTP_URI(uri_str))
{
uri->protocol = URI_HTTP;
protocol_len = strlen(PROTOCOL_HTTP);
}
else if (IS_GPFDIST_URI(uri_str))
{
uri->protocol = URI_GPFDIST;
protocol_len = strlen(PROTOCOL_GPFDIST);
}
else if (IS_GPFDISTS_URI(uri_str))
{
uri->protocol = URI_GPFDISTS;
protocol_len = strlen(PROTOCOL_GPFDISTS);
}
else /* not recognized. treat it as a custom protocol */
{
char *post_protocol = strstr(uri_str, "://");
if(!post_protocol)
{
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("invalid URI \'%s\' : undefined structure", uri_str)));
}
else
{
protocol_len = post_protocol - uri_str;
uri->customprotocol = (char *) palloc (protocol_len + 1);
strncpy(uri->customprotocol, uri_str, protocol_len);
uri->customprotocol[protocol_len] = '\0';
uri->protocol = URI_CUSTOM;
return uri; /* we let the user parse it himself later on */
}
/* this is a non existing protocol */
protocol_len = 0; /* shut compiler up */
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("invalid URI \'%s\' : undefined protocol", uri_str)));
}
/* make sure there is more to the uri string */
if (strlen(uri_str) <= protocol_len)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("invalid URI \'%s\' : missing host name and path", uri_str)));
/*
* parse host name
*/
start = (char *) uri_str + protocol_len;
if (*start == '/') /* format "prot:///" ? (no hostname) */
{
/* the default is "localhost" */
uri->hostname = pstrdup("localhost");
end = start;
}
else
{
end = strchr(start, '/');
if (end == NULL)
{
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("invalid URI \'%s\' : missing host name or path", uri_str)));
}
else
{
char *colon, *p;
len = end - start;
/*
* host
*/
uri->hostname = (char *) palloc(len + 1);
strncpy(uri->hostname, start, len);
uri->hostname[len] = '\0';
/*
* MPP-13617, if we have an ipv6 address in the URI hostname
* (e.g. [2620:0:170:610::11]:8080/path/data.txt ) then we
* we start our search for the :port after the closing ].
*/
p = strchr(uri->hostname, ']');
if (p)
{
colon = strchr(p, ':');
/*
* Eliminate the [ ] from the hostname.
* note we don't change the uri->hostname pointer because we pfree() it later
*/
*p = '\0';
for (p = strchr(uri->hostname, '['); p && *p; p++)
{
p[0] = p[1];
}
}
else
{
colon = strchr(uri->hostname, ':');
}
/*
* port
*/
if (colon)
{
int portlen = 0;
uri->port = atoi(colon + 1);
portlen = strlen(colon);
/* now truncate ":<port>" from hostname */
uri->hostname[len - portlen] = '\0';
*colon = 0;
}
else
{
uri->port = -1; /* no port was indicated. will use default if needed */
}
}
}
/*
* We continue from the trailing host '/' since the
* path is an absolute path. Our previous ending point
* is the beginning of the file path, until the end of
* the uri string.
*/
start = end;
len = strlen(start);
/* make sure there is more to the uri string */
if (len <= 1)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("invalid URI \'%s\' : missing path", uri_str)));
uri->path = (char *) palloc(len + 1);
strcpy(uri->path, start);
uri->path[len] = '\0';
return uri;
}
void FreeExternalTableUri(Uri *uri)
{
if (uri->hostname)
pfree(uri->hostname);
if (uri->path)
pfree(uri->path);
if (uri->customprotocol)
pfree(uri->customprotocol);
pfree(uri);
}
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