greenplumn pxf_bridge 源码
greenplumn pxf_bridge 代码
文件路径：/gpcontrib/pxf_fdw/pxf_bridge.h
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
#ifndef _PXFBRIDGE_H
#define _PXFBRIDGE_H
#include "libchurl.h"
#include "pxf_fragment.h"
#include "cdb/cdbvars.h"
#include "nodes/pg_list.h"
/*
* Execution state of a foreign scan using pxf_fdw.
*/
typedef struct PxfFdwScanState
{
CHURL_HEADERS churl_headers;
CHURL_HANDLE churl_handle;
StringInfoData uri;
ListCell *current_fragment;
Relation relation;
char *filter_str;
ExprState *quals;
List *fragments;
List *retrieved_attrs;
PxfOptions *options;
CopyState cstate;
} PxfFdwScanState;
/*
* Execution state of a foreign insert operation.
*/
typedef struct PxfFdwModifyState
{
CopyState cstate; /* state of writing to PXF */
CHURL_HANDLE churl_handle; /* curl handle */
CHURL_HEADERS churl_headers; /* curl headers */
StringInfoData uri; /* rest endpoint URI for modify */
Relation relation;
PxfOptions *options; /* FDW options */
} PxfFdwModifyState;
/* Clean up churl related data structures from the context */
void PxfBridgeCleanup(PxfFdwModifyState *context);
/* Sets up data before starting import */
void PxfBridgeImportStart(PxfFdwScanState *pxfsstate);
/* Sets up data before starting export */
void PxfBridgeExportStart(PxfFdwModifyState *pxfmstate);
/* Reads data from the PXF server into the given buffer of a given size */
int PxfBridgeRead(void *outbuf, int minlen, int maxlen, void *extra);
/* Writes data from the given buffer of a given size to the PXF server */
int PxfBridgeWrite(PxfFdwModifyState *context, char *databuf, int datalen);
#endif /* _PXFBRIDGE_H */
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