Source Code for Module dap.client

 1  __author__ = "Roberto De Almeida <rob@pydap.org>" 
 2   
 3  import dap.lib 
 4  from dap.util.http import openurl 
 5  from dap.exceptions import ClientError 
 6   
 7   
 8 -def open(url, cache=None, username=None, password=None, verbose=False): 
 9      """Connect to a remote dataset. 
10   
11      This function opens a dataset stored in a DAP server: 
12   
13          >>> dataset = open(url, cache=None, username=None, password=None, verbose=False): 
14   
15      You can specify a cache location (a directory), so that repeated 
16      accesses to the same URL avoid the network. 
17       
18      The username and password may be necessary if the DAP server requires 
19      authentication. The 'verbose' option will make pydap print all the  
20      URLs that are acessed. 
21      """ 
22      # Set variables on module namespace. 
23      dap.lib.VERBOSE = verbose 
24   
25      if url.startswith('http'): 
26          for response in [_ddx, _ddsdas]: 
27              dataset = response(url, cache, username, password) 
28              if dataset: return dataset 
29          else: 
30              raise ClientError("Unable to open dataset.") 
31      else: 
32          from dap.plugins.lib import loadhandler 
33          # Open a local file. This is a clever hack. :) 
34          handler = loadhandler(url) 
35          dataset = handler._parseconstraints() 
36   
37      return dataset 
38   
39   
40 -def _ddsdas(baseurl, cache, username, password): 
41      ddsurl, dasurl = '%s.dds' % baseurl, '%s.das' % baseurl 
42   
43      # Get metadata. 
44      respdds, dds = openurl(ddsurl) 
45      respdas, das = openurl(dasurl) 
46   
47      if respdds['status'] == '200' and respdas['status'] == '200': 
48          from dap.parsers.dds import DDSParser 
49          from dap.parsers.das import DASParser 
50   
51          # Build dataset. 
52          dataset = DDSParser(dds, ddsurl, cache, username, password).parse() 
53   
54          # Add attributes. 
55          dataset = DASParser(das, dasurl, dataset).parse() 
56          return dataset 
57   
58   
59 -def _ddx(baseurl, cache, username, password): 
60      pass 
61