maddy302 / merkel-tree

Merkel Tree demo

The given merkle tree based data integrity check application can detect differences between two directories. Complete the implemention by filling in all TODOs functions in merkletree.py.

You must be these provided directories A and B to find which files are different.

the def print_tree(self, hash): function to print all files under a given directory along with hash value in the front of each node.

Directory structure

A
|-- dir1
|   |-- file11.txt
|   |-- file12.txt
|   |-- file13.txt
|-- dir2
|   |-- file21.txt
|   |-- file22.txt
|   |-- file23.txt
|   `-- file24.txt
|-- file1.txt
|-- file2.txt
|-- file3.txt
`-- file4.txt

Expected Output from print_tree():

5a111c6eb0f1d0052b5420f75c5e4d33 A
    -> d23ca9d5fc333862cc16cfa4775bd728 dir1
    -> f41fba8a445fe47182a474534b3ee47f dir2
    -> cdd60fb7f1b59f3461895fb238c77a0a file1.txt
    -> e4069a89d02170a56e27daaa6ea81859 file2.txt
    -> 78e1885a370bc213414858c648e916fb file3.txt
    -> c97336b6e52347826f8c7b0168049909 file4.txt
d23ca9d5fc333862cc16cfa4775bd728 dir1
    -> 27064003da39a4a8bda08730b06fc7b9 dir1/file11.txt
    -> 61ba29b15e22f3030c0a0ce4e36c00da dir1/file12.txt
    -> bd7b8b855864cf813a5e9ff0f79ab350 dir1/file13.txt
27064003da39a4a8bda08730b06fc7b9 dir1/file11.txt
61ba29b15e22f3030c0a0ce4e36c00da dir1/file12.txt
bd7b8b855864cf813a5e9ff0f79ab350 dir1/file13.txt
f41fba8a445fe47182a474534b3ee47f dir2
    -> c8d661a948cf8dc9a70f9ca75633c34f dir2/file21.txt
    -> 59ee8564e4d1a52c17557f447bb98f40 dir2/file22.txt
    -> dc6d821c596f9cde0967875fa8de90fe dir2/file23.txt
    -> 0c9643339784601bb3f6f43e63d1604b dir2/file24.txt
c8d661a948cf8dc9a70f9ca75633c34f dir2/file21.txt
59ee8564e4d1a52c17557f447bb98f40 dir2/file22.txt
dc6d821c596f9cde0967875fa8de90fe dir2/file23.txt
0c9643339784601bb3f6f43e63d1604b dir2/file24.txt
cdd60fb7f1b59f3461895fb238c77a0a file1.txt
e4069a89d02170a56e27daaa6ea81859 file2.txt
78e1885a370bc213414858c648e916fb file3.txt
c97336b6e52347826f8c7b0168049909 file4.txt

The def find_diff(merkle_tree_a, a_roothash, merkle_tree_b, b_roothash): function to find differences between the given two Merkle trees.

Hint: both find_diff and print_tree functions require to recursively call its own function to handle child nodes (hash -> dir/file).

Expected output of correct solution

Individual hash value can be different, but the directory diff result must be the same as the below.

python3 merkletree.py

Merkle Tree for directory: A
5a111c6eb0f1d0052b5420f75c5e4d33 A
    -> d23ca9d5fc333862cc16cfa4775bd728 dir1
    -> f41fba8a445fe47182a474534b3ee47f dir2
    -> cdd60fb7f1b59f3461895fb238c77a0a file1.txt
    -> e4069a89d02170a56e27daaa6ea81859 file2.txt
    -> 78e1885a370bc213414858c648e916fb file3.txt
    -> c97336b6e52347826f8c7b0168049909 file4.txt
d23ca9d5fc333862cc16cfa4775bd728 dir1
    -> 27064003da39a4a8bda08730b06fc7b9 dir1/file11.txt
    -> 61ba29b15e22f3030c0a0ce4e36c00da dir1/file12.txt
    -> bd7b8b855864cf813a5e9ff0f79ab350 dir1/file13.txt
27064003da39a4a8bda08730b06fc7b9 dir1/file11.txt
61ba29b15e22f3030c0a0ce4e36c00da dir1/file12.txt
bd7b8b855864cf813a5e9ff0f79ab350 dir1/file13.txt
f41fba8a445fe47182a474534b3ee47f dir2
    -> c8d661a948cf8dc9a70f9ca75633c34f dir2/file21.txt
    -> 59ee8564e4d1a52c17557f447bb98f40 dir2/file22.txt
    -> dc6d821c596f9cde0967875fa8de90fe dir2/file23.txt
    -> 0c9643339784601bb3f6f43e63d1604b dir2/file24.txt
c8d661a948cf8dc9a70f9ca75633c34f dir2/file21.txt
59ee8564e4d1a52c17557f447bb98f40 dir2/file22.txt
dc6d821c596f9cde0967875fa8de90fe dir2/file23.txt
0c9643339784601bb3f6f43e63d1604b dir2/file24.txt
cdd60fb7f1b59f3461895fb238c77a0a file1.txt
e4069a89d02170a56e27daaa6ea81859 file2.txt
78e1885a370bc213414858c648e916fb file3.txt
c97336b6e52347826f8c7b0168049909 file4.txt
------------------------------
Merkle Tree for directory: B
13236b34cf89620d54b20b9700681a64 B
    -> d23ca9d5fc333862cc16cfa4775bd728 dir1
    -> c1004e01de99ef195c4dcae30a165930 dir2
    -> cdd60fb7f1b59f3461895fb238c77a0a file1.txt
    -> e4069a89d02170a56e27daaa6ea81859 file2.txt
    -> 78e1885a370bc213414858c648e916fb file3.txt
    -> c97336b6e52347826f8c7b0168049909 file4.txt
d23ca9d5fc333862cc16cfa4775bd728 dir1
    -> 27064003da39a4a8bda08730b06fc7b9 dir1/file11.txt
    -> 61ba29b15e22f3030c0a0ce4e36c00da dir1/file12.txt
    -> bd7b8b855864cf813a5e9ff0f79ab350 dir1/file13.txt
27064003da39a4a8bda08730b06fc7b9 dir1/file11.txt
61ba29b15e22f3030c0a0ce4e36c00da dir1/file12.txt
bd7b8b855864cf813a5e9ff0f79ab350 dir1/file13.txt
c1004e01de99ef195c4dcae30a165930 dir2
    -> c8d661a948cf8dc9a70f9ca75633c34f dir2/file21.txt
    -> 59ee8564e4d1a52c17557f447bb98f40 dir2/file22.txt
    -> dc6d821c596f9cde0967875fa8de90fe dir2/file23.txt
    -> b909a28e6b8f06f84ea051bf0c8acd10 dir2/file24.txt
c8d661a948cf8dc9a70f9ca75633c34f dir2/file21.txt
59ee8564e4d1a52c17557f447bb98f40 dir2/file22.txt
dc6d821c596f9cde0967875fa8de90fe dir2/file23.txt
b909a28e6b8f06f84ea051bf0c8acd10 dir2/file24.txt
cdd60fb7f1b59f3461895fb238c77a0a file1.txt
e4069a89d02170a56e27daaa6ea81859 file2.txt
78e1885a370bc213414858c648e916fb file3.txt
c97336b6e52347826f8c7b0168049909 file4.txt
------------------------------
SAME: dir1
DIFF: dir2
SAME: dir2/file21.txt
SAME: dir2/file22.txt
SAME: dir2/file23.txt
DIFF: dir2/file24.txt
SAME: file1.txt
SAME: file2.txt
SAME: file3.txt
SAME: file4.txt