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7223c4a5aa
re: https://github.com/Unidata/netcdf-c/issues/1451 The situation with the various DAP (and other) remote test servers is currently in a state of flux. For example, Unidata admin is planning to forcibly shift the remote test server to remotetest.unidata.ucar.edu soon. In addition, the server test.opendap.org has shown some recent instability. The result is that various DAP (and byterange) tests can fail unexpectedly. This is an irritant to users and reveals nothing about test sucess or failure. Solve by modifying tests to report server inaccessibility and otherwise pretend to succeed. This puts an onus on Unidata to detect such server failures, but will not cause users to see spurious failures. [Note. Do similar fix for netcdf-java]. The check is: 1. export SETX=1 to cause all the shell scripts to trace 2. search the log files for the phrase "WARNING" (in upper case) and see if it is complaining about not finding a server. Misc. Changes ------------- 1. Added a pingurl program to see if a server was up. 2. modified some test case url targets
315 lines
7.7 KiB
C
315 lines
7.7 KiB
C
/*! \file
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Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
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2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014,
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2015, 2016, 2017, 2018
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University Corporation for Atmospheric Research/Unidata.
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See \ref copyright file for more info.
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*/
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/*
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Report from Ansely Manke:
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I've attached a file with a short c program that
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demonstrates what I'm seeing. I don't know that we'd call
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this a constraint, so that was a misleading description.
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The thing I'm mimicking is a sequence where I read the 2-D
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coordinate variables, make some decisions about the size of
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a subset region, and then define index ranges and strides
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for reading other variables. Reading the full variable
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happens correctly, but the read with strides winds up
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messing up the data. Here it shows up returning some valid
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data and some zero's, but in other sequences of events it
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seems to be actually mis-ordered.
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I notice that the results are correct if the initial read of
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the variable uses counts that are size-1. So that might be a
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clue. And the read is correct if I either close and reopen
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the dataset after reading the original full variable, or if
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I don't do that step of first reading the whole grid. It's
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also fine with NetCDF 4.2.1.1.
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-Ansley
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Problem was two-fold:
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1. struct Getvara has the dsttype field as OC_Type rather than nc_type
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2. the dap odometer code dapnew_segment was incorrectly
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handling strides > 1: specifically, the stop position was incorrect.
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*/
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/* vars_whoi_test */
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/* acm 4/2013 */
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/* ansley.b.manke@noaa.gov */
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/* test nc_get_vars_float with calls similar to Ferret calls */
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/*linked with:
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cc vars_whoi_test.c -g -o vars_whoi_test_4211 /usr/local/netcdf_4211/lib/libnetcdf.a /usr/local/hdf5_189/lib/libhdf5_hl.a /usr/local/hdf5_189/lib/libhdf5.a /usr/local/lib/libz.a -L/usr/lib64 -lc -lm -lcurl
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cc vars_whoi_test.c -g -o vars_whoi_test /home/users/ansley/local/x86_nc43/lib/libnetcdf.a /usr/local/hdf5_189/lib/libhdf5_hl.a /usr/local/hdf5_189/lib/libhdf5.a /usr/local/lib/libz.a -L/usr/lib64 -lc -lm -lcurl
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Closing and reopening the dataset between the two reads fixes the
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incorrect data return
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Setting the count to one less in the full data read also fixes the
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incorrect data return
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*/
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#include<stdlib.h>
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#include<stdio.h>
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#include<string.h>
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#include "netcdf.h"
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#include "ncdispatch.h"
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#include "nctestserver.h"
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#define VERBOSE 1
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/*
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2014-07-01: (DMH) Changed the URL to use one from remotetest server.
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to remove dependence on an external server.
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*/
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/*
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static char* URL="http://geoport.whoi.edu/thredds/dodsC/coawst_4/use/fmrc/coawst_4_use_best.ncd";
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Float64 lon_rho[eta_rho = 336][xi_rho = 896];
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Float64 lat_rho[eta_rho = 336][xi_rho = 896];
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*/
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#define URL "%s/dodsC/testdods/rtofs.nc"
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#define VAR1 "Latitude"
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#define VAR2 "Longitude"
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#define XSIZE 850
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#define YSIZE 712
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static char url[1024];
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int
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main()
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{
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int ncid;
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int varid;
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int i;
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int ncstatus;
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size_t start[5], count[5];
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ptrdiff_t stride[5];
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int pass = 1;
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int nelems = XSIZE*YSIZE;
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int idim, ndim;
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float *dat = (float*)malloc(sizeof(float)*nelems);
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float sdat[10];
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char* svc;
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/* Find Test Server */
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svc = nc_findtestserver("thredds",REMOTETESTSERVERS);
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if(svc == NULL) {
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fprintf(stderr,"WARNING: Cannot locate test server\n");
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exit(0);
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}
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snprintf(url,sizeof(url),URL,svc);
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for (idim=0; idim<5; idim++) {
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start[idim] = 0;
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count[idim] = 1;
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stride[idim] = 1;
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}
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ndim=2;
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printf(" \n");
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printf("********************\n");
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printf("open URL %s\n",url);
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printf(" \n");
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fflush(stdout);
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ncstatus = nc_open(url, NC_NOWRITE, &ncid);
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if(ncstatus != NC_NOERR) {
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fprintf(stderr,"Could not open: %s; server may be down; test ignored\n",url);
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exit(0);
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}
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ncstatus = nc_inq_varid(ncid, VAR1, &varid);
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ndim=2;
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#ifdef VERBOSE
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printf(" \n");
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printf("********************\n");
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printf("Read %s data w/o strides\n",VAR1);
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printf(" \n");
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#endif
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start[0] = 0;
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start[1] = 0;
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start[2] = 0;
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start[3] = 0;
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count[0] = XSIZE;
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count[1] = YSIZE;
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stride[0] = 1;
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stride[1] = 1;
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#ifdef VERBOSE
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for (idim=0; idim<ndim; idim++)
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printf("start[%1d]=%3lu count[%1d]=%3lu stride[%1d]=%3lu\n",
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idim,(unsigned long)start[idim],idim,(unsigned long)count[idim],idim,(unsigned long)stride[idim]);
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#endif
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ncstatus = nc_get_vars_float (ncid, varid, start, count, stride, (float*) dat);
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#ifdef VERBOSE
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printf(" \n");
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printf("********************\n");
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printf("Print some of %s\n",VAR1);
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printf(" \n");
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for (i=0; i<10; i++)
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printf("%s[%d] = %f\n",VAR1,i,dat[i]);
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printf(" \n");
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for (i=(nelems-11); i<(nelems-1); i++)
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printf("%s[%d] = %f\n",VAR1,i,dat[i]);
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printf(" \n");
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fflush(stdout);
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#endif
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memset((void*)dat,0,sizeof(dat));
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/* Read a second variable */
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ncstatus = nc_inq_varid(ncid, VAR2, &varid);
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ndim=2;
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#ifdef VERBOSE
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printf(" \n");
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printf("********************\n");
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printf("Read %s data w/o strides\n",VAR2);
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printf(" \n");
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fflush(stdout);
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#endif
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start[0] = 0;
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start[1] = 0;
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start[2] = 0;
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start[3] = 0;
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count[0] = XSIZE;
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count[1] = YSIZE;
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stride[0] = 1;
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stride[1] = 1;
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#ifdef VERBOSE
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for (idim=0; idim<ndim; idim++)
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printf("start[%d]=%3lu count[%d]=%3lu stride[%d]=%3lu\n",
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idim, (unsigned long)start[idim], idim, (unsigned long)count[idim], idim, (unsigned long)stride[idim]);
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fflush(stdout);
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#endif
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ncstatus = nc_get_vars_float (ncid, varid, start, count, stride, (float*) dat);
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#ifdef VERBOSE
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printf(" \n");
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printf("********************\n");
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printf("Print some of %s\n",VAR2);
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printf(" \n");
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for (i=0; i<10; i++)
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printf("%s[%d] = %f\n",VAR2,i,dat[i]);
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printf(" \n");
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printf(" \n");
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for (i=(nelems-11); i<(nelems-1); i++)
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printf("%s[%d] = %f\n",VAR2,i,dat[i]);
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printf(" \n");
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fflush(stdout);
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#endif
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memset((void*)dat,0,sizeof(dat));
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/* close and reopen the dataset, then the below read is correct */
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#ifdef VERBOSE
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printf(" \n");
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printf("********************\n");
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printf("Close and reopen the dataset\n");
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fflush(stdout);
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#endif
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ncstatus = nc_close (ncid);
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ncstatus = nc_open(url, NC_NOWRITE, &ncid);
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/* ----------------------------------------------------- */
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/* Read a subset of the data with strides */
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ncstatus = nc_inq_varid(ncid, VAR1, &varid);
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#ifdef VERBOSE
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printf(" \n");
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printf("********************\n");
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printf("Read a subset of %s data with strides\n",VAR1);
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printf(" \n");
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fflush(stdout);
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#endif
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start[0] = 250;
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start[1] = 704;
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count[0] = 5;
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count[1] = 2;
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stride[0] = 2;
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stride[1] = 4;
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#ifdef VERBOSE
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for (idim=0; idim<ndim; idim++)
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printf("start[%d]=%lu count[%d]=%lu stride[%d]=%lu\n",
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idim,(unsigned long)start[idim],idim,(unsigned long)count[idim],idim,(unsigned long)stride[idim]);
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fflush(stdout);
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#endif
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memset((void*)sdat,0,sizeof(sdat));
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ncstatus = nc_get_vars_float (ncid, varid, start, count, stride, (float*) sdat);
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printf("status = %d\n", ncstatus);
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/* Verify that all read values are 50 <= n < 51 */
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for (i=0; i<10; i++) {
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if(sdat[i] <= 50.0 || sdat[i] > 51.0) {
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printf("Out of range: %s[%d] = %f\n",VAR1, i,sdat[i]);
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pass = 0;
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}
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}
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#ifdef VERBOSE
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printf(" \n");
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printf("********************\n");
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printf("Print values read. They should all be 50.xxxx \n");
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printf(" \n");
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for (i=0; i<10; i++)
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printf("%s[%d] = %f\n",VAR1,i,sdat[i]);
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fflush(stdout);
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#endif
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ncstatus = nc_close (ncid);
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if(!pass) {
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printf("*** FAIL: %s value out of range.\n",VAR1);
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exit(1);
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}
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printf("*** PASS\n");
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free(dat);
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exit(0);
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}
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