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https://github.com/Unidata/netcdf-c.git
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5fa2defc7e
Prior to this PR, DAP4 always fetched the whole (constrained) dataset This PR changes the query processing so 1. It reads data on a per-variable request (equivalent to calling nc_get_var()). 2. It tracks a response for every query. Most of the changes reflect having to do per-variable requests. In any case, doing all this significantly reduces the amount of data transmitted and hence speeds up DAP4 requests.
133 lines
4.3 KiB
C
133 lines
4.3 KiB
C
/*
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* Copyright 2018, University Corporation for Atmospheric Research
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* See netcdf/COPYRIGHT file for copying and redistribution conditions.
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*/
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#ifndef NCURI_H
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#define NCURI_H
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#include "ncexternl.h"
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/* Define flags to control what is included by ncuribuild;
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protocol+host+port always included
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*/
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#define NCURIPATH 1
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#define NCURIPWD 2
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#define NCURIQUERY 4
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#define NCURIFRAG 8
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#define NCURIENCODEPATH 16 /* If output url path should be encoded */
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#define NCURIENCODEQUERY 32 /* If output url query should be encoded */
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#define NCURIENCODE (NCURIENCODEPATH|NCURIENCODEQUERY)
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#define NCURIBASE (NCURIPWD|NCURIPATH)
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#define NCURISVC (NCURIBASE|NCURIQUERY) /* for sending to server */
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#define NCURIALL (NCURIBASE|NCURIQUERY|NCURIFRAG) /* for rebuilding after changes */
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/*! This is an open structure meaning
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it is ok to directly access its fields
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*/
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typedef struct NCURI {
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char* uri; /* copy of url as passed by the caller */
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char* protocol;
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char* user; /* from user:password@ */
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char* password; /* from user:password@ */
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char* host; /*!< host*/
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char* port; /*!< port */
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char* path; /*!< path */
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char* query; /*!< query */
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char* fragment; /*!< fragment */
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void* fraglist; /* some representation of the decomposed fragment string */
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void* querylist; /* some representation of the decomposed query string */
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} NCURI;
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#if 0
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/* Declaration modifiers for DLL support (MSC et al) */
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#if defined(DLL_NETCDF) /* define when library is a DLL */
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# if defined(DLL_EXPORT) /* define when building the library */
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# define MSC_EXTRA __declspec(dllexport)
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# else
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# define MSC_EXTRA __declspec(dllimport)
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# endif
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# include <io.h>
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#else
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#define MSC_EXTRA /**< Needed for DLL build. */
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#endif /* defined(DLL_NETCDF) */
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#define EXTERNL MSC_EXTRA extern /**< Needed for DLL build. */
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#endif
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#if defined(_CPLUSPLUS_) || defined(__CPLUSPLUS__) || defined(__CPLUSPLUS)
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extern "C" {
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#endif
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EXTERNL int ncuriparse(const char* s, NCURI** ncuri);
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EXTERNL void ncurifree(NCURI* ncuri);
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/* Replace the protocol */
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EXTERNL int ncurisetprotocol(NCURI*,const char* newprotocol);
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/* Replace the host */
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EXTERNL int ncurisethost(NCURI*,const char* newhost);
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/* Replace the path */
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EXTERNL int ncurisetpath(NCURI*,const char* newpath);
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/* Replace the constraints */
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EXTERNL int ncurisetquery(NCURI*,const char* query);
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/* Replace the fragment list */
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EXTERNL int ncurisetfragments(NCURI*, const char* fragments);
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/* Rebuild the uri */
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EXTERNL int ncurirebuild(NCURI*);
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/* Replace a specific &key=...& in uri fragment */
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EXTERNL int ncurisetfragmentkey(NCURI* duri,const char* key, const char* value);
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/* append a specific &key=...& in uri fragment */
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EXTERNL int ncuriappendfragmentkey(NCURI* duri,const char* key, const char* value);
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/* Replace a specific &key=...& in uri query */
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EXTERNL int ncurisetquerykey(NCURI* duri,const char* key, const char* value);
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/* append a specific &key=...& in uri query */
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EXTERNL int ncuriappendquerykey(NCURI* duri,const char* key, const char* value);
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/* Get the actual list of queryies */
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EXTERNL void* ncuriqueryparams(NCURI* uri);
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/* Get the actual list of frags */
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EXTERNL void* ncurifragmentparams(NCURI* uri);
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/* Construct a complete NC URI; caller frees returned string */
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EXTERNL char* ncuribuild(NCURI*,const char* prefix, const char* suffix, int flags);
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/*! Search the fragment for a given parameter
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Null result => entry not found; !NULL=>found;
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In any case, the result is imutable and should not be free'd.
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*/
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EXTERNL const char* ncurifragmentlookup(NCURI*, const char* param);
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/*! Search the query for a given parameter
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Null result => entry not found; !NULL=>found;
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In any case, the result is imutable and should not be free'd.
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*/
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EXTERNL const char* ncuriquerylookup(NCURI*, const char* param);
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/* URL Encode/Decode */
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EXTERNL char* ncuridecode(const char* s);
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/* Partial decode */
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EXTERNL char* ncuridecodepartial(const char* s, const char* decodeset);
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/* Encode using specified character set */
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EXTERNL char* ncuriencodeonly(const char* s, const char* allowable);
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/* Encode user or pwd */
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EXTERNL char* ncuriencodeuserpwd(const char* s);
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/* Deep clone a uri */
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EXTERNL NCURI* ncuriclone(NCURI*);
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#if defined(_CPLUSPLUS_) || defined(__CPLUSPLUS__) || defined(__CPLUSPLUS)
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}
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#endif
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#endif /*NCURI_H*/
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