diff xenaGetDataset.py @ 52:bb840cc2603d

better error handling

--- a/xenaGetDataset.py	Thu Aug 13 10:24:12 2015 -0700
+++ b/xenaGetDataset.py	Thu Aug 13 17:30:19 2015 -0700
@@ -3,20 +3,25 @@
 import argparse
 import re
 import urllib2
-
+import sys
 
 def main():
-    parser = argparse.ArgumentParser()
-    parser.add_argument("dataHub", type=str)
-    parser.add_argument("datasetId", type=str)
-    parser.add_argument("datafile", type=str)
-    args = parser.parse_args()
+    try:
+        parser = argparse.ArgumentParser()
+        parser.add_argument("dataHub", type=str)
+        parser.add_argument("datasetId", type=str)
+        parser.add_argument("datafile", type=str)
+        parser.add_argument("GALAXY_URL", type=str)
+        args = parser.parse_args()
+    except:
+        print "too few input parameters"
+        sys.exit(2)
 
+    data = open(args.datafile, "w")
     datasetUrlHost = re.sub("/proj/", "/download/", args.dataHub)
     datasetIdTokens = re.split("/", args.datasetId)
     datasetUrl = datasetUrlHost + "/" + "/".join(datasetIdTokens[1:])
 
-    data = open(args.datafile, "w")
 
     try:
         dd = urllib2.urlopen(datasetUrl)
@@ -24,8 +29,10 @@
         dd.close()
         data.close()
     except:
-        data.wriet("You entered dataset id: %s\n" % (args.datasetId))
-        data.write("Dataset does not exist. check typo.")
+        data.write("There is an error\n\n")
+        data.write("You entered dataset id: %s\n" % (args.datasetId))
+        data.write("Possible causes for error:\n")
+        data.write("1. Dataset does not exist. check type.\n")
         data.close()
         sys.exit(1)