merge_har.py

""" 
simple script to merge multiple har files 
usage: python merge_har.py out.har mylogs/*.har
"""
import simplejson 
import sys

def merge(out_fn, in_files):
    merged_log = {
        'version': '1.1',
        'creator': {
            'name': 'merge_har',
            'version': '0.1',
        },
        'pages': [],
        'entries': [],
    }

    for fn in in_files:
        log = simplejson.loads(open(fn).read())['log']
        # copy in the browser data from the first file we read
        if 'browser' not in merged_log:
            merged_log['browser'] = log['browser']
        
        merged_log['pages'].extend(log['pages'])
        merged_log['entries'].extend(log['entries'])

    open(out_fn, 'w').write(simplejson.dumps({'log': merged_log}, indent=4, sort_keys=True))


if __name__ == '__main__':
    merge(sys.argv[1], sys.argv[2:])