mirror of
https://github.com/Unidata/netcdf-c.git
synced 2024-12-21 08:39:46 +08:00
f6e25b695e
re: https://github.com/Unidata/netcdf-c/issues/2117 re: https://github.com/Unidata/netcdf-c/issues/2119 * Modify libsrc to allow byte-range reading of netcdf-3 files in private S3 buckets; this required using the aws sdk. Also add a test case. * The aws sdk can sometimes cause problems if the Awd::ShutdownAPI function is not called. So at optional atexit() support to ensure it is called. This is disabled for Windows. * Add documentation to nczarr.md on how to build and use the aws sdk under windows. Currently it builds, but testing fails. * Switch testing from stratus to the Unidata bucket on S3. * Improve support for the s3: url protocol. * Add a s3 specific utility code file: ds3util.c * Modify NC_infermodel to attempt to read the magic number of byte-ranged files in S3. ## Misc. * Move and rename the core S3 SDK wrapper code (libnczarr/zs3sdk.cpp) to libdispatch since it now used in libsrc as well as libnczarr. * Add calls to nc_finalize in the utilities in case atexit is disabled. * Add header only json parser to the distribution rather than as a built source.
583 lines
15 KiB
C
583 lines
15 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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#include "zincludes.h"
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#include "zmap.h"
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#include "ncs3sdk.h"
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#undef S3DEBUG
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/*
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Map our simplified map model to an S3 bucket + objects.
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For the API, the mapping is as follows:
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1. A bucket contains multiple datasets.
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2. A key to the root of a dataset is assumed to be with respect to
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the bucket name from the original open/create url.
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2. Containment is simulated using the S3 key conventions.
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3. Every object (e.g. group or array) is mapped to an S3 object
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4. Meta data objects (e.g. .zgroup, .zarray, etc) are kept as an S3 object.
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5. Actual variable data (for e.g. chunks) is stored as
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using an S3 object per chunk.
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Given a key, one of three things is true.
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1. The key points to a content-bearing object
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2. The key has no associated object
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This basically means that there is no notion of not-found:
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all keys are assumed to exist, but may have no content.
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Notes:
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1. Our canonical URLs use path style rather than virtual-host, although
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virtual-host URLs will be accepted anc converted to path-style.
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*/
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#undef DEBUG
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#define DEBUGERRORS
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#define NCZM_S3SDK_V1 1
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#define ZS3_PROPERTIES (0)
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/* Define the "subclass" of NCZMAP */
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typedef struct ZS3MAP {
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NCZMAP map;
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NCS3INFO s3;
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void* s3client;
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char* errmsg;
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} ZS3MAP;
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/* Forward */
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static NCZMAP_API nczs3sdkapi; // c++ will not allow static forward variables
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static int zs3len(NCZMAP* map, const char* key, size64_t* lenp);
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static void freevector(size_t nkeys, char** list);
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static void zs3initialize(void);
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static int s3clear(ZS3MAP* z3map, const char* key);
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static int maketruekey(const char* rootpath, const char* key, char** truekeyp);
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static void
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errclear(ZS3MAP* z3map)
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{
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if(z3map) {
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if(z3map->errmsg)
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free(z3map->errmsg);
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z3map->errmsg = NULL;
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}
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}
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#ifdef DEBUGERRORS
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static void
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reporterr(ZS3MAP* z3map)
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{
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if(z3map) {
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if(z3map->errmsg) {
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nclog(NCLOGERR,z3map->errmsg);
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}
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errclear(z3map);
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}
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}
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#else
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#define reporterr(map)
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#endif
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/* Define the Dataset level API */
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static int zs3initialized = 0;
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static void
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zs3initialize(void)
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{
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if(!zs3initialized) {
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ZTRACE(7,NULL);
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zs3initialized = 1;
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(void)ZUNTRACE(NC_NOERR);
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}
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}
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void
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NCZ_s3finalize(void)
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{
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zs3initialized = 0;
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}
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static int
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zs3create(const char *path, int mode, size64_t flags, void* parameters, NCZMAP** mapp)
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{
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int stat = NC_NOERR;
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ZS3MAP* z3map = NULL;
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NCURI* url = NULL;
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char* prefix = NULL;
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char* truekey = NULL;
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NC_UNUSED(flags);
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NC_UNUSED(parameters);
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ZTRACE(6,"path=%s mode=%d flag=%llu",path,mode,flags);
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if(!zs3initialized) zs3initialize();
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/* Build the z3 state */
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if((z3map = (ZS3MAP*)calloc(1,sizeof(ZS3MAP))) == NULL)
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{stat = NC_ENOMEM; goto done;}
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z3map->map.format = NCZM_S3;
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z3map->map.url = strdup(path);
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z3map->map.mode = mode;
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z3map->map.flags = flags;
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z3map->map.api = (NCZMAP_API*)&nczs3sdkapi;
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/* Parse the URL */
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ncuriparse(path,&url);
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if(url == NULL)
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{stat = NC_EURL; goto done;}
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/* Convert to canonical path-style */
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if((stat = NC_s3urlprocess(url,&z3map->s3))) goto done;
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/* Verify the root path */
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if(z3map->s3.rootkey == NULL)
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{stat = NC_EURL; goto done;}
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z3map->s3client = NC_s3sdkcreateclient(&z3map->s3);
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{
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int exists = 0;
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/* Does bucket already exist */
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if((stat = NC_s3sdkbucketexists(z3map->s3client,z3map->s3.bucket,&exists, &z3map->errmsg))) goto done;
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if(!exists) {
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/* create it */
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if((stat = NC_s3sdkbucketcreate(z3map->s3client,z3map->s3.region,z3map->s3.bucket,&z3map->errmsg)))
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goto done;
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}
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/* The root object should not exist */
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switch (stat = NC_s3sdkinfo(z3map->s3client,z3map->s3.bucket,z3map->s3.rootkey,NULL,&z3map->errmsg)) {
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case NC_EEMPTY: /* no such object */
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stat = NC_NOERR; /* which is what we want */
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errclear(z3map);
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break;
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case NC_NOERR: stat = NC_EOBJECT; goto done; /* already exists */
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default: reporterr(z3map); goto done;
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}
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if(!stat) {
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/* Delete objects inside root object tree */
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s3clear(z3map,z3map->s3.rootkey);
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}
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}
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if(mapp) *mapp = (NCZMAP*)z3map;
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done:
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reporterr(z3map);
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ncurifree(url);
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nullfree(prefix);
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nullfree(truekey);
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if(stat) nczmap_close((NCZMAP*)z3map,1);
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return ZUNTRACE(stat);
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}
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/* The problem with open is that there
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no obvious way to test for existence.
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So, we assume that the dataset must have
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some content. We look for that */
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static int
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zs3open(const char *path, int mode, size64_t flags, void* parameters, NCZMAP** mapp)
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{
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int stat = NC_NOERR;
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ZS3MAP* z3map = NULL;
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NCURI* url = NULL;
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NClist* content = NULL;
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size_t nkeys = 0;
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NC_UNUSED(flags);
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NC_UNUSED(parameters);
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ZTRACE(6,"path=%s mode=%d flags=%llu",path,mode,flags);
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if(!zs3initialized) zs3initialize();
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/* Build the z3 state */
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if((z3map = (ZS3MAP*)calloc(1,sizeof(ZS3MAP))) == NULL)
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{stat = NC_ENOMEM; goto done;}
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z3map->map.format = NCZM_S3;
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z3map->map.url = strdup(path);
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z3map->map.mode = mode;
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z3map->map.flags = flags;
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z3map->map.api = (NCZMAP_API*)&nczs3sdkapi;
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/* Parse the URL */
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if((stat = ncuriparse(path,&url))) goto done;
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if(url == NULL)
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{stat = NC_EURL; goto done;}
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/* Convert to canonical path-style */
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if((stat = NC_s3urlprocess(url,&z3map->s3))) goto done;
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/* Verify root path */
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if(z3map->s3.rootkey == NULL)
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{stat = NC_EURL; goto done;}
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z3map->s3client = NC_s3sdkcreateclient(&z3map->s3);
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/* Search the root for content */
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content = nclistnew();
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if((stat = NC_s3sdkgetkeys(z3map->s3client,z3map->s3.bucket,z3map->s3.rootkey,&nkeys,NULL,&z3map->errmsg)))
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goto done;
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if(nkeys == 0) {
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/* dataset does not actually exist; we choose to return ENOOBJECT instead of EEMPTY */
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stat = NC_ENOOBJECT;
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goto done;
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}
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if(mapp) *mapp = (NCZMAP*)z3map;
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done:
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reporterr(z3map);
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nclistfreeall(content);
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ncurifree(url);
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if(stat) nczmap_close((NCZMAP*)z3map,0);
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return ZUNTRACE(stat);
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}
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/**************************************************/
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/* Object API */
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/*
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@return NC_NOERR if key points to a content-bearing object.
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@return NC_EEMPTY if object at key has no content.
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@return NC_EXXX return true error
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*/
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static int
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zs3exists(NCZMAP* map, const char* key)
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{
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int stat = NC_NOERR;
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ZTRACE(6,"map=%s key=%s",map->url,key);
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stat = zs3len(map,key,NULL);
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return ZUNTRACE(stat);
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}
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/*
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@return NC_NOERR if key points to a content-bearing object.
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@return NC_EEMPTY if object at key has no content.
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@return NC_EXXX return true error
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*/
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static int
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zs3len(NCZMAP* map, const char* key, size64_t* lenp)
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{
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int stat = NC_NOERR;
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ZS3MAP* z3map = (ZS3MAP*)map;
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char* truekey = NULL;
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ZTRACE(6,"map=%s key=%s",map->url,key);
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if((stat = maketruekey(z3map->s3.rootkey,key,&truekey))) goto done;
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switch (stat = NC_s3sdkinfo(z3map->s3client,z3map->s3.bucket,truekey,lenp,&z3map->errmsg)) {
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case NC_NOERR: break;
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case NC_EEMPTY:
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if(lenp) *lenp = 0;
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goto done;
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default:
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goto done;
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}
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done:
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nullfree(truekey);
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reporterr(z3map);
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return ZUNTRACE(stat);
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}
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/*
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@return NC_NOERR if object at key was read
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@return NC_EEMPTY if object at key has no content.
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@return NC_EXXX return true error
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*/
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static int
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zs3read(NCZMAP* map, const char* key, size64_t start, size64_t count, void* content)
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{
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int stat = NC_NOERR;
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ZS3MAP* z3map = (ZS3MAP*)map; /* cast to true type */
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size64_t size = 0;
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char* truekey = NULL;
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ZTRACE(6,"map=%s key=%s start=%llu count=%llu",map->url,key,start,count);
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if((stat = maketruekey(z3map->s3.rootkey,key,&truekey))) goto done;
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switch (stat=NC_s3sdkinfo(z3map->s3client, z3map->s3.bucket, truekey, &size, &z3map->errmsg)) {
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case NC_NOERR: break;
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case NC_EEMPTY: goto done;
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default: goto done;
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}
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/* Sanity checks */
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if(start >= size || start+count > size)
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{stat = NC_EEDGE; goto done;}
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if(count > 0) {
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if((stat = NC_s3sdkread(z3map->s3client, z3map->s3.bucket, truekey, start, count, content, &z3map->errmsg)))
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goto done;
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}
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done:
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nullfree(truekey);
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reporterr(z3map);
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return ZUNTRACE(stat);
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}
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/*
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@return NC_NOERR if key content was written
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@return NC_EEMPTY if object at key has no content.
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@return NC_EXXX return true error
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*/
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static int
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zs3write(NCZMAP* map, const char* key, size64_t start, size64_t count, const void* content)
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{
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int stat = NC_NOERR;
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ZS3MAP* z3map = (ZS3MAP*)map; /* cast to true type */
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char* chunk = NULL; /* use char* so we can do arithmetic with it */
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size64_t objsize = 0;
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size64_t memsize = 0;
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size64_t endwrite = start+count; /* first pos just above overwritten data */
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char* truekey = NULL;
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int isempty = 0;
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ZTRACE(6,"map=%s key=%s start=%llu count=%llu",map->url,key,start,count);
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if((stat = maketruekey(z3map->s3.rootkey,key,&truekey))) goto done;
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/* Apparently S3 has no write byterange operation, so we need to read the whole object,
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copy data, and then rewrite */
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switch (stat=NC_s3sdkinfo(z3map->s3client, z3map->s3.bucket, truekey, &objsize, &z3map->errmsg)) {
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case NC_NOERR: /* Figure out the memory size of the object */
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memsize = (endwrite > objsize ? endwrite : objsize);
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break;
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case NC_EEMPTY:
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memsize = endwrite;
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isempty = 1;
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break;
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default: reporterr(z3map); goto done;
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}
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if(isempty)
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chunk = (char*)calloc(1,memsize); /* initialize it */
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else
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chunk = (char*)malloc(memsize);
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if(chunk == NULL)
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{stat = NC_ENOMEM; goto done;}
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if(start > 0 && objsize > 0) { /* must read to preserve data before start */
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if((stat = NC_s3sdkread(z3map->s3client, z3map->s3.bucket, truekey, 0, objsize, (void*)chunk, &z3map->errmsg)))
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goto done;
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}
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#if 0
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if(newsize > objsize) {
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/* Zeroize the part of the object added */
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memset(((char*)chunk)+objsize,0,(newsize-objsize));
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objsize = newsize;
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}
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#endif
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/* overwrite the relevant part of the memory with the contents */
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if(count > 0)
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memcpy(((char*)chunk)+start,content,count); /* there may be data above start+count */
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/* (re-)write */
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if((stat = NC_s3sdkwriteobject(z3map->s3client, z3map->s3.bucket, truekey, memsize, (void*)chunk, &z3map->errmsg)))
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goto done;
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done:
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nullfree(truekey);
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reporterr(z3map);
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nullfree(chunk);
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return ZUNTRACE(stat);
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}
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|
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static int
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zs3close(NCZMAP* map, int deleteit)
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{
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int stat = NC_NOERR;
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ZS3MAP* z3map = (ZS3MAP*)map;
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ZTRACE(6,"map=%s deleteit=%d",map->url, deleteit);
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if(deleteit)
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s3clear(z3map,z3map->s3.rootkey);
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if(z3map->s3client && z3map->s3.bucket && z3map->s3.rootkey) {
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NC_s3sdkclose(z3map->s3client, &z3map->s3, deleteit, &z3map->errmsg);
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}
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reporterr(z3map);
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z3map->s3client = NULL;
|
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NC_s3clear(&z3map->s3);
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nullfree(z3map->errmsg);
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nczm_clear(map);
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nullfree(map);
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return ZUNTRACE(stat);
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}
|
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|
|
/*
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Return a list of full keys immediately "below" a specified prefix,
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but not including the prefix.
|
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In theory, the returned list should be sorted in lexical order,
|
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but it possible that it is not.
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@return NC_NOERR if success, even if no keys returned.
|
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@return NC_EXXX return true error
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*/
|
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static int
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zs3search(NCZMAP* map, const char* prefix, NClist* matches)
|
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{
|
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int i,stat = NC_NOERR;
|
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ZS3MAP* z3map = (ZS3MAP*)map;
|
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char** list = NULL;
|
|
size_t nkeys;
|
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NClist* tmp = NULL;
|
|
char* trueprefix = NULL;
|
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char* newkey = NULL;
|
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const char* p;
|
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|
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ZTRACE(6,"map=%s prefix0=%s",map->url,prefix);
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|
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if((stat = maketruekey(z3map->s3.rootkey,prefix,&trueprefix))) goto done;
|
|
|
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if(*trueprefix != '/') return NC_EINTERNAL;
|
|
if((stat = NC_s3sdkgetkeys(z3map->s3client,z3map->s3.bucket,trueprefix,&nkeys,&list,&z3map->errmsg)))
|
|
goto done;
|
|
if(nkeys > 0) {
|
|
size_t tplen = strlen(trueprefix);
|
|
tmp = nclistnew();
|
|
/* Remove the trueprefix from the front of all the returned keys */
|
|
for(i=0;i<nkeys;i++) {
|
|
const char* l = list[i];
|
|
if(memcmp(trueprefix,l,tplen)==0) {
|
|
p = l+tplen; /* Point to start of suffix */
|
|
/* If the key is same as trueprefix, ignore it */
|
|
if(*p == '\0') continue;
|
|
if(nczm_segment1(p,&newkey)) goto done;
|
|
nclistpush(tmp,newkey); newkey = NULL;
|
|
}
|
|
}
|
|
/* Now remove duplicates */
|
|
for(i=0;i<nclistlength(tmp);i++) {
|
|
int j;
|
|
int duplicate = 0;
|
|
const char* is = nclistget(tmp,i);
|
|
for(j=0;j<nclistlength(matches);j++) {
|
|
const char* js = nclistget(matches,j);
|
|
if(strcmp(js,is)==0) {duplicate = 1; break;} /* duplicate */
|
|
}
|
|
if(!duplicate)
|
|
nclistpush(matches,strdup(is));
|
|
}
|
|
nclistfreeall(tmp); tmp = NULL;
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
for(i=0;i<nclistlength(matches);i++) {
|
|
const char* is = nclistget(matches,i);
|
|
fprintf(stderr,"search: %s\n",is);
|
|
}
|
|
#endif
|
|
|
|
done:
|
|
nullfree(newkey);
|
|
nullfree(trueprefix);
|
|
reporterr(z3map);
|
|
nclistfreeall(tmp);
|
|
freevector(nkeys,list);
|
|
return ZUNTRACEX(stat,"|matches|=%d",(int)nclistlength(matches));
|
|
}
|
|
|
|
/**************************************************/
|
|
/* S3 Utilities */
|
|
|
|
/*
|
|
Remove all objects with keys which have
|
|
rootkey as prefix; rootkey is a truekey
|
|
*/
|
|
static int
|
|
s3clear(ZS3MAP* z3map, const char* rootkey)
|
|
{
|
|
int stat = NC_NOERR;
|
|
char** list = NULL;
|
|
char** p;
|
|
size_t nkeys = 0;
|
|
if(z3map->s3client && z3map->s3.bucket && rootkey) {
|
|
if((stat = NC_s3sdksearch(z3map->s3client, z3map->s3.bucket, rootkey, &nkeys, &list, &z3map->errmsg)))
|
|
goto done;
|
|
if(list != NULL) {
|
|
for(p=list;*p;p++) {
|
|
/* If the key is the rootkey, skip it */
|
|
if(strcmp(rootkey,*p)==0) continue;
|
|
#ifdef S3DEBUG
|
|
fprintf(stderr,"s3clear: %s\n",*p);
|
|
#endif
|
|
if((stat = NC_s3sdkdeletekey(z3map->s3client, z3map->s3.bucket, *p, &z3map->errmsg)))
|
|
goto done;
|
|
}
|
|
}
|
|
}
|
|
|
|
done:
|
|
reporterr(z3map);
|
|
NCZ_freestringvec(nkeys,list);
|
|
return THROW(stat);
|
|
}
|
|
|
|
/* Prefix key with path to root to make true key */
|
|
static int
|
|
maketruekey(const char* rootpath, const char* key, char** truekeyp)
|
|
{
|
|
int stat = NC_NOERR;
|
|
char* truekey = NULL;
|
|
size_t len, rootlen, keylen;
|
|
|
|
if(truekeyp == NULL) goto done;
|
|
rootlen = strlen(rootpath);
|
|
keylen = strlen(key);
|
|
len = (rootlen+keylen+1+1+1);
|
|
|
|
truekey = (char*)malloc(len+1);
|
|
if(truekey == NULL) {stat = NC_ENOMEM; goto done;}
|
|
truekey[0] = '\0';
|
|
if(rootpath[0] != '/')
|
|
strlcat(truekey,"/",len+1);
|
|
strlcat(truekey,rootpath,len+1);
|
|
if(rootpath[rootlen-1] != '/')
|
|
strlcat(truekey,"/",len+1);
|
|
if(key[0] == '/') key++;
|
|
strlcat(truekey,key,len+1);
|
|
if(key[keylen-1] == '/') /* remove any trailing '/' */
|
|
truekey[strlen(truekey)-1] = '\0';
|
|
*truekeyp = truekey; truekey = NULL;
|
|
|
|
done:
|
|
nullfree(truekey);
|
|
return stat;
|
|
}
|
|
|
|
static void
|
|
freevector(size_t nkeys, char** list)
|
|
{
|
|
size_t i;
|
|
if(list) {
|
|
for(i=0;i<nkeys;i++) nullfree(list[i]);
|
|
nullfree(list);
|
|
}
|
|
}
|
|
|
|
/**************************************************/
|
|
/* External API objects */
|
|
|
|
NCZMAP_DS_API zmap_s3sdk;
|
|
NCZMAP_DS_API zmap_s3sdk = {
|
|
NCZM_S3SDK_V1,
|
|
ZS3_PROPERTIES,
|
|
zs3create,
|
|
zs3open,
|
|
};
|
|
|
|
static NCZMAP_API
|
|
nczs3sdkapi = {
|
|
NCZM_S3SDK_V1,
|
|
zs3close,
|
|
zs3exists,
|
|
zs3len,
|
|
zs3read,
|
|
zs3write,
|
|
zs3search,
|
|
};
|