prepare hashing

src/polluck_blockchain/placeholder_native.pyx

@@ -17,6 +17,7 @@ from polluck_blockchain.block cimport Block
 from libcpp.unordered_map cimport unordered_map
 from libcpp.string cimport string
 from libc.stdint cimport uint64_t
+from cython.operator import postincrement, dereference
 
 ctypedef unsigned long ULong
 ctypedef unordered_map[uint64_t, Block*] BcHashmap
@@ -92,6 +93,12 @@ cdef class PyBlock:
 
         return py_block
 
+    def __repr__(self):
+        return f"PyBlock({self.index, self.timestamp, self.nonce, self.data})"
+    
+    def __str__(self):
+        return self.__repr__()
+
     # cpdef _perform_hash(self):
     #     parts = bytearray()
     #     parts.extend(self._index.to_bytes(8, "big"))
@@ -164,15 +171,29 @@ cdef class Blockchain:
     def __init__(self, *args, **kwargs):
         pass
     
-    # TODO add entries of map
-    # ownership is typically not transferred from the Blockchain extension class
     def __dealloc__(self):
+        # ownership is typically not transferred from the Blockchain extension class
+        cdef BcHashmap.iterator it = self._chain.begin()
         if self._chain is not NULL:
+            while it != self._chain.end():
+                del dereference(it).second
+                postincrement(it)
+
             del self._chain
             self._chain = NULL
 
     def __len__(self):
         return self._index + 1
+    
+    def print_key_value_pair(self):
+        cdef BcHashmap.iterator it = self._chain.begin()
+        cdef Block *block
+        while it != self._chain.end():
+            print(dereference(it).first)
+            block = dereference(it).second
+            py_block = PyBlock.from_ptr(block)
+            print(py_block)
+            postincrement(it)
 
     @property
     def genesis_done(self):
@@ -207,9 +228,9 @@ cdef class Blockchain:
             "0".encode("UTF-8"),
             "".encode("UTF-8"),
         )
-        block.hash = <string>"dummy hash".encode("UTF-8")
+        block.hash = "dummy hash".encode("UTF-8")
         self.add_block(block)
-        self._genesis_done = <bint>1
+        self._genesis_done = True
 
     def new_block(self, data):
         if not self._genesis_done: