more core implementation in Cython

src/polluck_blockchain/placeholder_native.pyx

@@ -16,92 +16,40 @@ import dopt_basics.datetime
 from polluck_blockchain.block cimport Block
 from libcpp.unordered_map cimport unordered_map
 from libcpp.string cimport string
+from libc.stdint cimport uint64_t
 
 ctypedef unsigned long ULong
-
-# cdef struct PyStringC:
-#     char* ptr
-#     Py_ssize_t length
-
-
-# cdef PyStringC_to_unicode(PyStringC string):
-#     return string.ptr[: string.length].decode("UTF-8", "strict")
-
-
-# cdef PyStringC_to_bytes(PyStringC string):
-#     return <bytes>string.ptr[: string.length]
-
-
+ctypedef unordered_map[uint64_t, Block*] BcHashmap
 
 cdef timestamp_to_datetime(double ts):
     return datetime.datetime.fromtimestamp(ts, dopt_basics.datetime.TIMEZONE_UTC)
 
 
-# cdef class StringHolder:
-#     cdef readonly PyStringC c
-#     cdef object _py_data
-
-#     def __cinit__(self, data: str):
-#         """accepting Python str
-
-#         Parameters
-#         ----------
-#         data : str
-#             _description_
-#         """
-#         if not isinstance(data, str):
-#             raise TypeError("Data not 'str'")
-
-#         self._py_data = data.encode("UTF-8")
-#         self.c = PyStringC(self._py_data, len(self._py_data))
-
-#     @property
-#     def py_string(self):
-#         return PyStringC_to_unicode(self.c)
-
-#     @property
-#     def py_bytes(self):
-#         return PyStringC_to_bytes(self.c)
-
-
-# BlockC = cython.struct(
-#     index=cython.ulonglong,
-#     timestamp=cython.double,
-#     data=PyStringC,
-#     previous_hash=PyStringC,
-#     nonce=cython.ulonglong,
-# )
-
-
 cdef float_to_bytes(double num):
     return struct.pack(">d", num)
 
-# cdef struct BlockC:
-#     ULong _index
-#     double _timestamp
-#     string _data
-#     string _prev_hash
-#     ULong _nonce
-#     string _hash
 
-
-cdef class BlockPy:
+cdef class PyBlock:
     cdef:
-        ULong _index
-        double _timestamp
-        string _data
-        string _prev_hash
-        ULong _nonce
-        string _hash
-        Block* Block
+        # ULong _index
+        # double _timestamp
+        # string _data
+        # string _prev_hash
+        # ULong _nonce
+        # string _hash
+        Block *BlockC
+        bint ptr_owner
 
     def __cinit__(self, 
-        index: int,
-        data: str,
-        previous_hash: str,
-        nonce: int,
+        index,
+        nonce,
+        data,
+        previous_hash,
+        from_ptr=False,
     ):
-        self.Block = new Block(
+        self.ptr_owner = False
+        if not from_ptr:
+            self.BlockC = new Block(
                 index,
                 datetime.datetime(2025, 12, 1, 12, 0, 0).timestamp(),
                 nonce,
@@ -109,25 +57,13 @@ cdef class BlockPy:
                 previous_hash.encode("UTF-8"),
                 "".encode("UTF-8"),
             )
+            if self.BlockC == NULL:
+                raise MemoryError("Allocation of block object failed")
 
-    def get_data(self):
-        return self.Block.data.decode("UTF-8")
+            self.ptr_owner = True
 
-    # def __init__(
-    #     self,
-    #     index: int,
-    #     data: str,
-    #     previous_hash: str,
-    #     nonce: int,
-    # ):
-        # self.C = new BlockC(
-        #     index,
-        #     datetime.datetime(2025, 12, 1, 12, 0, 0).timestamp(),
-        #     data.encode("UTF-8"),
-        #     previous_hash.encode("UTF-8"),
-        #     nonce,
-        #     "".encode("UTF-8"),
-        # )
+    def __init__(self, *args, **kwargs):
+        pass
         # self._index = index
         # # self._timestamp = dopt_basics.datetime.current_time_tz().timestamp()
         # self._timestamp = datetime.datetime(2025, 12, 1, 12, 0, 0).timestamp()
@@ -136,6 +72,26 @@ cdef class BlockPy:
         # self._nonce = nonce
         # self._hash = "".encode("UTF-8")
     
+    def __dealloc__(self):
+        if self.BlockC is not NULL and self.ptr_owner is True:
+            del self.BlockC
+            self.BlockC = NULL
+
+    @staticmethod
+    cdef PyBlock from_ptr(Block *block, bint owner=False):
+        cdef PyBlock py_block = PyBlock.__new__(
+            PyBlock,
+            block.index,
+            block.nonce,
+            block.data,
+            block.prev_hash,
+            True,
+        )
+        py_block.BlockC = block
+        py_block.ptr_owner = owner
+
+        return py_block
+
     # cpdef _perform_hash(self):
     #     parts = bytearray()
     #     parts.extend(self._index.to_bytes(8, "big"))
@@ -152,51 +108,124 @@ cdef class BlockPy:
     # def compute_hash(self):
     #     return self._perform_hash().hexdigest()
 
-    # # Python public API
-    # @property
-    # def index(self):
-    #     return self._index
+    # Python public API
+    @property
+    def index(self):
+        return self.BlockC.index
 
-    # @property
-    # def timestamp(self):
-    #     return timestamp_to_datetime(self._timestamp)
+    @property
+    def timestamp(self):
+        return timestamp_to_datetime(self.BlockC.timestamp)
 
-    # @property
-    # def data(self):
-    #     return self._data.decode("UTF-8")
+    @property
+    def data(self):
+        return self.BlockC.data.decode("UTF-8")
 
-    # @property
-    # def prev_hash(self):
-    #     return self._prev_hash.decode("UTF-8")
+    @property
+    def prev_hash(self):
+        return self.BlockC.prev_hash.decode("UTF-8")
 
-    # @property
-    # def nonce(self):
-    #     return self._nonce
+    @property
+    def nonce(self):
+        return self.BlockC.nonce
 
     # @nonce.setter
     # def nonce(self, value: int):
     #     self._nonce = value
 
-    # @property
-    # def hash(self):
-    #     return self._hash.decode("UTF-8")
+    @property
+    def hash(self):
+        return self.BlockC.hash.decode("UTF-8")
 
     # @hash.setter
-    # def hash(self, value: str):
+    # def hash(self, value):
     #     if not isinstance(value, str):
     #         raise TypeError("No string")
     #     self._hash = value.encode("UTF-8")
 
+# cdef void add_block(BcHashmap *map, Block *block):
+#     map[block.index] = block
 
-# cdef class Blockchain:
-#     cdef int _difficulty
-#     cdef size_t _index
-#     cdef unordered_map[size_t, int] _chain
 
-#     def __cinit__(self):
-#         self._difficulty = 1
-#         self._index = <size_t>0
-#         # self._chain = new unordered_map[size_t, Block]()
+cdef class Blockchain:
+    cdef int _difficulty
+    cdef uint64_t _index
+    cdef BcHashmap *_chain
+    cdef bint _genesis_done
+
+    def __cinit__(self):
+        self._difficulty = 1
+        self._index = <uint64_t>0
+        self._genesis_done = <bint>0
+        self._chain = new unordered_map[uint64_t, Block*]()
+        if self._chain is NULL:
+            raise MemoryError("Could not allocate hasmap")
+    
+    def __init__(self, *args, **kwargs):
+        pass
+    
+    def __dealloc__(self):
+        if self._chain is not NULL:
+            del self._chain
+            self._chain = NULL
+
+    def __len__(self):
+        return self._index + 1
+
+    @property
+    def genesis_done(self):
+        return self._genesis_done
+
+    @property
+    def index(self):
+        return self._index
+
+    # TODO error handling
+    cdef Block* get_block_c(self, uint64_t idx):
+        return self._chain[0][idx]
+    
+    def get_block(self, idx):
+        if idx < 0 or idx > self._index:
+            raise IndexError("Index value is out of bounds")
+        
+        cdef Block *block = self.get_block_c(idx)
+        return PyBlock.from_ptr(block, owner=False)
+
+    cdef void add_block(self, Block *block):
+        self._chain[0][block.index] = block
+        if self._genesis_done:
+            self._index += 1
+
+    def create_genesis_block(self):
+        cdef Block *block = new Block(
+            self._index,
+            datetime.datetime(2025, 12, 1, 12, 0, 0).timestamp(),
+            0,
+            "Genesis Block".encode("UTF-8"),
+            "0".encode("UTF-8"),
+            "".encode("UTF-8"),
+        )
+        block.hash = <string>"dummy hash".encode("UTF-8")
+        self.add_block(block)
+        self._genesis_done = <bint>1
+
+    def new_block(self, data):
+        if not self._genesis_done:
+            raise RuntimeError("Create a genesis block first.")
+
+        cdef Block *prev_block = self.get_block_c(self._index)
+        cdef string prev_hash = prev_block.prev_hash
+        cdef uint64_t new_idx = self._index + 1
+
+        cdef Block *block = new Block(
+            new_idx,
+            datetime.datetime(2025, 12, 1, 12, 0, 0).timestamp(),
+            0,
+            data.encode("UTF-8"),
+            prev_hash,
+            "".encode("UTF-8"),
+        )
+        self.add_block(block)
 
 #     def __init__(
 #         self,