Compare two -expected.json ES events

compare-golden.py

# Usage:
# compare-golden-events.py <old.json> <new.json>

import json
import sys


def missing(keys, dct):
    r = []
    for key in keys:
        if key not in dct:
            r.append(key)
    return r


def changed(a, b):
    c = []
    for key in a.keys():
        if key in b and b[key] != a[key]:
            c.append("{0} [`{1}` -> `{2}`]".format(key, a[key], b[key]))
    return c


def kprint(prefix, keys):
    for k in keys:
        print prefix, k

oldf = open(sys.argv[1], 'rb')
newf = open(sys.argv[2], 'rb')
old = json.load(oldf)
new = json.load(newf)

assert len(old) == len(new), "Size differs"

for i in range(len(old)):
    oldK = old[i].keys()
    newK = new[i].keys()
    removed = missing(oldK, new[i])
    added = missing(newK, old[i])
    chg = changed(old[i], new[i])

    print 'event', i
    kprint('-', removed)
    kprint('+', added)
    kprint('(change)', chg)
    print