#130: Support reading Duniter's local json blockchain

J'ai ajouté la fonctionnalité de construire des blocs depuis du json.
J'ai ajouté deux tests avec des blocs réels (bloc 0 et bloc 250004) donc ça fait beaucoup de volume dans les tests, peut-être qu'il faudrait réduire ça.
J'ai travaillé un peu à l'aveugle parce que je ne connais pas du tout duniterpy, peut-être que ce n'est pas très propre, dis-moi ce qu'il faut modifier et je le ferai :)

Close #130 (closed)

duniterpy/documents/block.py

@@ -252,6 +252,84 @@ class Block(Document):
     def blockUID(self) -> BlockUID:
         return BlockUID(self.number, self.proof_of_work())
 
+    @classmethod
+    def from_parsed_json(cls: Type[BlockType], parsed_json_block: dict) -> BlockType:
+        """return a block from the python structure produced when parsing json"""
+        b = parsed_json_block  # alias for readability
+        version = b["version"]
+        currency = b["currency"]
+        arguments = {  # arguments used to create block
+            "version": b["version"],
+            "currency": b["currency"],
+            "number": b["number"],
+            "powmin": b["powMin"],
+            "time": b["time"],
+            "mediantime": b["medianTime"],
+            "ud": b["dividend"],
+            "unit_base": b["unitbase"],
+            "issuer": b["issuer"],
+            "issuers_frame": b["issuersFrame"],
+            "issuers_frame_var": b["issuersFrameVar"],
+            "different_issuers_count": b["issuersCount"],
+            "prev_hash": b["previousHash"],
+            "prev_issuer": b["previousIssuer"],
+            "parameters": b["parameters"],
+            "members_count": b["membersCount"],
+            "identities": b["identities"],
+            "joiners": b["joiners"],
+            "actives": b["actives"],
+            "leavers": b["leavers"],
+            "revokations": b["revoked"],
+            "excluded": b["excluded"],
+            "certifications": b["certifications"],
+            "transactions": b["transactions"],
+            "inner_hash": b["inner_hash"],
+            "nonce": b["nonce"],
+            "signature": b["signature"],
+        }
+        # parameters: Optional[Sequence[str]]
+        if arguments["parameters"]:
+            arguments["parameters"] = arguments["parameters"].split(":")
+        # identities: List[Identity]
+        arguments["identities"] = [
+            Identity.from_inline(version, currency, i + "\n")
+            for i in arguments["identities"]
+        ]
+        # joiners: List[Membership]
+        arguments["joiners"] = [
+            Membership.from_inline(version, currency, "IN", i + "\n")
+            for i in arguments["joiners"]
+        ]
+        # actives: List[Membership]
+        arguments["actives"] = [
+            Membership.from_inline(version, currency, "IN", i + "\n")
+            for i in arguments["actives"]
+        ]
+        # leavers: List[Membership]
+        arguments["leavers"] = [
+            Membership.from_inline(version, currency, "OUT", i + "\n")
+            for i in arguments["leavers"]
+        ]
+        # revokations: List[Revocation]
+        arguments["revokations"] = [
+            Revocation.from_inline(version, currency, i + "\n")
+            for i in arguments["revokations"]
+        ]
+        # certifications: List[Certification]
+        arguments["certifications"] = [
+            Certification.from_inline(
+                version, currency, arguments["inner_hash"], i + "\n"
+            )
+            for i in arguments["certifications"]
+        ]
+        # transactions: List[Transaction]
+        arguments["transactions"] = [
+            Transaction.from_bma_history(currency, i) for i in arguments["transactions"]
+        ]
+
+        # now that the arguments are ready, return the block
+        return cls(**arguments)
+
     @classmethod
     def from_signed_raw(cls: Type[BlockType], signed_raw: str) -> BlockType:
         lines = signed_raw.splitlines(True)