Package Products :: Package ZenRRD :: Module RRDUtil |
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# Module RRDUtil

source code

Classes | [hide private]
RRDUtil Wrapper class around rrdtool

Functions | [hide private]
number or string |
_checkUndefined(x) Sanity check on the min, max values | source code
convertToRRDTime(val) Convert any value that is passed in to a string that is acceptable to use for RRDtool's start and end parameters. | source code
fixMissingRRDs(gopts) Parses a list of RRDtool gopts for DEFs. | source code
fixRRDFilename(filename) Attempting to render a graph containing a DEF referencing a non-existent filename will cause the entire graph to fail to render. | source code

Variables | [hide private]
| __doc__ = `"""RRDU`...``
| log = `logging.getLogger("zen.RRDUtil")`
| EMPTY_RRD = `zenPath('perf', 'empty.rrd')`

Function Details | [hide private]

### _checkUndefined(x) | source code
Sanity check on the min, max values Parameters: `x` (number) - RRD min or max value Returns: number or string Either the number or 'U' (for undefined)

### convertToRRDTime(val) | source code
    Convert any value that is passed in to a string that is acceptable to use
    for RRDtool's start and end parameters. Raises ValueError if this is not
    possible.

    See the AT-STYLE TIME SPECIFICATION and TIME REFERENCE SPECIFICATION
    sections of the following document.

        http://oss.oetiker.ch/rrdtool/doc/rrdfetch.en.html

    Note: Currently this method is only fixing floats by turning them into
          strings with no decimal places.

### fixMissingRRDs(gopts) | source code
Parses a list of RRDtool gopts for DEFs. Runs all of the filenames referenced by those DEFs through the fixRRDFilename method to make sure that they will exist and not cause the rendering to fail.

### fixRRDFilename(filename) | source code
Attempting to render a graph containing a DEF referencing a non-existent filename will cause the entire graph to fail to render. This method is a helper to verify existence of an RRD file. If the file doesn't exist, a placeholder RRD filename with no values in it will be returned instead.

Variables Details | [hide private]

  ### __doc__ Value:
      """RRDUtil

      Wrapper routines around the rrdtool library.
      """