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Changed python code to new encoding

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This commit is contained in:
Vitalik Buterin 2013-12-29 20:10:58 -05:00
parent c489ff0cbb
commit 8e2a08ffde
1 changed files with 36 additions and 30 deletions
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66
trie.py
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@ -12,6 +12,25 @@ class DB():
def put(self,key,value): return self.db.Put(key,value)
def delete(self,key): return self.db.Delete(key)
def hexarraykey_to_bin(key):
term = 1 if key[-1] == 16 else 0
if term: key2 = key[:-1]
oddlen = len(key) % 2
flags = 2 * term + oddlen
if oddlen: key = [flags] + key
else: key = [flags,0] + key
o = ''
for i in range(0,len(key),2):
o += chr(16 * key[i] + key[i+1])
return o
def bin_to_hexarraykey(bindata):
o = ['0123456789abcdef'.find(x) for x in key[1:].encode('hex')]
if o[0] >= 2: o.append(16)
if o[0] % 2 == 1: o = o[1:]
else: o = o[2:]
return o
databases = {}
class Trie():
@ -21,19 +40,6 @@ class Trie():
if dbfile not in databases:
databases[dbfile] = DB(dbfile)
self.db = databases[dbfile]
def __encode_key(self,key):
term = 1 if key[-1] == 16 else 0
oddlen = (len(key) - term) % 2
prefix = ('0' if oddlen else '')
main = ''.join(['0123456789abcdef'[x] for x in key[:len(key)-term]])
return chr(2 * term + oddlen) + (prefix+main).decode('hex')
def __decode_key(self,key):
o = ['0123456789abcdef'.find(x) for x in key[1:].encode('hex')]
if key[0] == '\x01' or key[0] == '\x03': o = o[1:]
if key[0] == '\x02' or key[0] == '\x03': o.append(16)
return o
def __get_state(self,node,key):
if self.debug: print 'nk',node.encode('hex'),key
@ -45,7 +51,7 @@ class Trie():
raise Exception("node not found in database")
elif len(curnode) == 2:
(k2,v2) = curnode
k2 = self.__decode_key(k2)
k2 = hexarraykey_to_bin(k2)
if len(key) >= len(k2) and k2 == key[:len(k2)]:
return self.__get_state(v2,key[len(k2):])
else:
@ -69,7 +75,7 @@ class Trie():
return value
else:
if not node:
newnode = [ self.__encode_key(key), value ]
newnode = [ hexarraykey_to_bin(key), value ]
return self.__put(newnode)
curnode = rlp.decode(self.db.get(node))
if self.debug: print 'icn', curnode
@ -77,9 +83,9 @@ class Trie():
raise Exception("node not found in database")
if len(curnode) == 2:
(k2, v2) = curnode
k2 = self.__decode_key(k2)
k2 = hexarraykey_to_bin(k2)
if key == k2:
newnode = [ self.__encode_key(key), value ]
newnode = [ hexarraykey_to_bin(key), value ]
return self.__put(newnode)
else:
i = 0
@ -96,7 +102,7 @@ class Trie():
if i == 0:
return newhash3
else:
newnode4 = [ self.__encode_key(key[:i]), newhash3 ]
newnode4 = [ hexarraykey_to_bin(key[:i]), newhash3 ]
return self.__put(newnode4)
else:
newnode = [ curnode[i] for i in range(17) ]
@ -114,15 +120,15 @@ class Trie():
if self.debug: print 'dcn', curnode
if len(curnode) == 2:
(k2, v2) = curnode
k2 = self.__decode_key(k2)
k2 = hexarraykey_to_bin(k2)
if key == k2:
return ''
elif key[:len(k2)] == k2:
newhash = self.__delete_state(v2,key[len(k2):])
childnode = rlp.decode(self.db.get(newhash))
if len(childnode) == 2:
newkey = k2 + self.__decode_key(childnode[0])
newnode = [ self.__encode_key(newkey), childnode[1] ]
newkey = k2 + hexarraykey_to_bin(childnode[0])
newnode = [ hexarraykey_to_bin(newkey), childnode[1] ]
else:
newnode = [ curnode[0], newhash ]
return self.__put(newnode)
@ -142,8 +148,8 @@ class Trie():
if len(childnode) == 17:
newnode2 = [ key[0], newnode[onlynode] ]
elif len(childnode) == 2:
newkey = [onlynode] + self.__decode_key(childnode[0])
newnode2 = [ self.__encode_key(newkey), childnode[1] ]
newkey = [onlynode] + hexarraykey_to_bin(childnode[0])
newnode2 = [ hexarraykey_to_bin(newkey), childnode[1] ]
else:
newnode2 = newnode
return self.__put(newnode2)
@ -154,7 +160,7 @@ class Trie():
if not curnode:
raise Exception("node not found in database")
if len(curnode) == 2:
key = self.__decode_key(curnode[0])
key = hexarraykey_to_bin(curnode[0])
if key[-1] == 16: return 1
else: return self.__get_size(curnode[1])
elif len(curnode) == 17:
@ -170,15 +176,15 @@ class Trie():
if not curnode:
raise Exception("node not found in database")
if len(curnode) == 2:
lkey = self.__decode_key(curnode[0])
lkey = hexarraykey_to_bin(curnode[0])
o = {}
if lkey[-1] == 16:
o[curnode[0]] = curnode[1]
else:
d = self.__to_dict(curnode[1])
for v in d:
subkey = self.__decode_key(v)
totalkey = self.__encode_key(lkey+subkey)
subkey = hexarraykey_to_bin(v)
totalkey = hexarraykey_to_bin(lkey+subkey)
o[totalkey] = d[v]
return o
elif len(curnode) == 17:
@ -186,8 +192,8 @@ class Trie():
for i in range(16):
d = self.__to_dict(curnode[i])
for v in d:
subkey = self.__decode_key(v)
totalkey = self.__encode_key([i] + subkey)
subkey = hexarraykey_to_bin(v)
totalkey = hexarraykey_to_bin([i] + subkey)
o[totalkey] = d[v]
if curnode[16]: o[chr(16)] = curnode[16]
return o
@ -198,7 +204,7 @@ class Trie():
d = self.__to_dict(self.root)
o = {}
for v in d:
v2 = ''.join(['0123456789abcdef'[x] for x in self.__decode_key(v)[:-1]])
v2 = ''.join(['0123456789abcdef'[x] for x in hexarraykey_to_bin(v)[:-1]])
if not as_hex: v2 = v2.decode('hex')
o[v2] = d[v]
return o