Commit Graph

16 Commits

Author SHA1 Message Date
edwardhartnett
2077729abc removed base_pe functions from dispatch table 2019-08-15 06:51:06 -06:00
Dennis Heimbigner
4c92fc3405 Remove netcdf-4 conditional on the dispatch table.
Partially address: https://github.com/Unidata/netcdf-c/issues/1056

Currently, some of the entries in the dispatch table
are conditional'd on USE_NETCDF4.

As a step in upgrading the dispatch table for use
with user-defined tables, we remove that conditional.
This means that all dispatch tables must implement the
netcdf-4 specific functions even if only to make them
return NC_ENOTNC4. To simplify this, a set of default
functions are defined in libdispatch/dnotnc4.c to provide this
behavior. The file libdispatch/dnotnc3.c is also relevant to
this.

The primary fix is to modify the various dispatch tables to
remove the conditional and use the functions in
libdispatch/dnotnc4.c as appropriate. In practice, all of the
existing tables are prepared to handle this, so the only
real change is to remove the conditionals.

Misc. Unrelated fixes
1. Fix some annoying warnings in ncvalidator.

Notes:
1. This has not been tested with either pnetcdf or hdf4 enabled.
   When those are enabled, it is possible that there are still
   some conditionals that need to be fixed.
2019-07-20 13:59:40 -06:00
Dennis Heimbigner
331a1f1c63 Centralize calls to curl_global_init and curl_global_cleanup
re: https://github.com/Unidata/netcdf-c/issues/1388

1. Centralize calls to curl_global_init and curl_global_cleanup
   to libdispatch/ddispatch.c
2. Make the above calls if options require curl: currently
   any of DAP2, DAP4, or byterange.
3. Side issue: Fix obscure bug in mmapio.c involving non-persistent mmap.
2019-05-03 13:22:54 -06:00
Dennis Heimbigner
6934aa2e8b Thread safety: step 1: cleanup
re: https://github.com/Unidata/netcdf-c/issues/1373 (partial)

* Mark some global constants be const to indicate to make them easier to track.
* Hide direct access to the ncrc_globalstate behind a function call.
* Convert dispatch tables to constants (except the user defined ones)
  This has some consequences in terms of function arguments needing to be marked
  as const also.
* Remove some no longer needed global fields
* Aggregate all the globals in nclog.c
* Uniformly replace nc_sizevector{0,1} with NC_coord_{zero,one}
* Uniformly replace nc_ptrdffvector1 with NC_stride_one
* Remove some obsolete code
2019-03-30 14:06:20 -06:00
Dennis Heimbigner
0c59e13bf7 Master merge, conflict resolution, cleanup 2019-02-24 16:54:13 -07:00
Dennis Heimbigner
45a8a265b8 master merge 2019-02-23 17:14:12 -07:00
Ed Hartnett
8b1f5a8fad cleanup of whitespace in HDF5 directory 2019-02-19 05:18:02 -07:00
Dennis Heimbigner
bf2746b8ea Provide byte-range reading of remote datasets
re: issue https://github.com/Unidata/netcdf-c/issues/1251

Assume that you have the URL to a remote dataset
which is a normal netcdf-3 or netcdf-4 file.

This PR allows the netcdf-c to read that dataset's
contents as a netcdf file using HTTP byte ranges
if the remote server supports byte-range access.

Originally, this PR was set up to access Amazon S3 objects,
but it can also access other remote datasets such as those
provided by a Thredds server via the HTTPServer access protocol.
It may also work for other kinds of servers.

Note that this is not intended as a true production
capability because, as is known, this kind of access to
can be quite slow. In addition, the byte-range IO drivers
do not currently do any sort of optimization or caching.

An additional goal here is to gain some experience with
the Amazon S3 REST protocol.

This architecture and its use documented in
the file docs/byterange.dox.

There are currently two test cases:

1. nc_test/tst_s3raw.c - this does a simple open, check format, close cycle
   for a remote netcdf-3 file and a remote netcdf-4 file.
2. nc_test/test_s3raw.sh - this uses ncdump to investigate some remote
   datasets.

This PR also incorporates significantly changed model inference code
(see the superceded PR https://github.com/Unidata/netcdf-c/pull/1259).

1. It centralizes the code that infers the dispatcher.
2. It adds support for byte-range URLs

Other changes:

1. NC_HDF5_finalize was not being properly called by nc_finalize().
2. Fix minor bug in ncgen3.l
3. fix memory leak in nc4info.c
4. add code to walk the .daprc triples and to replace protocol=
   fragment tag with a more general mode= tag.

Final Note:
Th inference code is still way too complicated. We need to move
to the validfile() model used by netcdf Java, where each
dispatcher is asked if it can process the file. This decentralizes
the inference code. This will be done after all the major new
dispatchers (PIO, Zarr, etc) have been implemented.
2019-01-01 18:27:36 -07:00
Ed Hartnett
d51b221c62 move setting of var chunk cache to libhdf5 2018-11-29 06:10:39 -07:00
Ed Hartnett
f9d3fff2c3 rest of removal of lazy att code from libsrc4 2018-11-26 11:11:56 -07:00
Ed Hartnett
c710b42707 moving lazy att code to libhdf5 2018-11-26 10:14:03 -07:00
Ed Hartnett
cc18944fa7 moved lazy atts handling for nc_inq_attid() 2018-11-26 09:58:31 -07:00
Ed Hartnett
d97824d3e6 moved lazy atts handling for nc_inq_att() 2018-11-26 09:51:28 -07:00
Ed Hartnett
1f64c66cdf rename HDF5 dispatch functions to start with NC4_HDF5 2018-11-26 08:13:57 -07:00
Ed Hartnett
0e9784a867 more changes to separate HDF5 from libsrc4 initialization 2018-11-26 05:44:59 -07:00
Ed Hartnett
6f969b0117 separate HDF5 initialization 2018-11-26 05:35:44 -07:00