stubbed out buy/sell claim

lbrynet/wallet/database.py

@@ -22,7 +22,8 @@ class WalletDatabase(BaseDatabase):
             is_claim boolean not null default 0,
             is_update boolean not null default 0,
             is_support boolean not null default 0,
-            is_purchase boolean not null default 0
+            is_buy boolean not null default 0,
+            is_sell boolean not null default 0
         );
     """
 
@@ -39,7 +40,8 @@ class WalletDatabase(BaseDatabase):
             'is_claim': txo.script.is_claim_name,
             'is_update': txo.script.is_update_claim,
             'is_support': txo.script.is_support_claim,
-            'is_purchase': txo.script.is_purchase_claim,
+            'is_buy': txo.script.is_buy_claim,
+            'is_sell': txo.script.is_sell_claim,
         })
         if txo.script.is_claim_involved:
             row['claim_id'] = txo.claim_id

lbrynet/wallet/script.py

@@ -1,5 +1,5 @@
 from torba.basescript import BaseInputScript, BaseOutputScript, Template
-from torba.basescript import PUSH_SINGLE, OP_DROP, OP_2DROP
+from torba.basescript import PUSH_SINGLE, PUSH_INTEGER, OP_DROP, OP_2DROP, PUSH_SUBSCRIPT, OP_VERIFY
 
 
 class InputScript(BaseInputScript):
@@ -9,20 +9,26 @@ class InputScript(BaseInputScript):
 class OutputScript(BaseOutputScript):
 
     # lbry custom opcodes
+
+    # checks
+    OP_PRICECHECK = 0xb0  # checks that the BUY output is >= SELL price
+
+    # tx types
     OP_CLAIM_NAME = 0xb5
     OP_SUPPORT_CLAIM = 0xb6
     OP_UPDATE_CLAIM = 0xb7
-    OP_PURCHASE_CLAIM = 0xb8
+    OP_SELL_CLAIM = 0xb8
+    OP_BUY_CLAIM = 0xb9
 
     CLAIM_NAME_OPCODES = (
         OP_CLAIM_NAME, PUSH_SINGLE('claim_name'), PUSH_SINGLE('claim'),
         OP_2DROP, OP_DROP
     )
     CLAIM_NAME_PUBKEY = Template('claim_name+pay_pubkey_hash', (
-            CLAIM_NAME_OPCODES + BaseOutputScript.PAY_PUBKEY_HASH.opcodes
+        CLAIM_NAME_OPCODES + BaseOutputScript.PAY_PUBKEY_HASH.opcodes
     ))
     CLAIM_NAME_SCRIPT = Template('claim_name+pay_script_hash', (
-            CLAIM_NAME_OPCODES + BaseOutputScript.PAY_SCRIPT_HASH.opcodes
+        CLAIM_NAME_OPCODES + BaseOutputScript.PAY_SCRIPT_HASH.opcodes
     ))
 
     SUPPORT_CLAIM_OPCODES = (
@@ -30,10 +36,10 @@ class OutputScript(BaseOutputScript):
         OP_2DROP, OP_DROP
     )
     SUPPORT_CLAIM_PUBKEY = Template('support_claim+pay_pubkey_hash', (
-            SUPPORT_CLAIM_OPCODES + BaseOutputScript.PAY_PUBKEY_HASH.opcodes
+        SUPPORT_CLAIM_OPCODES + BaseOutputScript.PAY_PUBKEY_HASH.opcodes
     ))
     SUPPORT_CLAIM_SCRIPT = Template('support_claim+pay_script_hash', (
-            SUPPORT_CLAIM_OPCODES + BaseOutputScript.PAY_SCRIPT_HASH.opcodes
+        SUPPORT_CLAIM_OPCODES + BaseOutputScript.PAY_SCRIPT_HASH.opcodes
     ))
 
     UPDATE_CLAIM_OPCODES = (
@@ -41,21 +47,26 @@ class OutputScript(BaseOutputScript):
         OP_2DROP, OP_2DROP
     )
     UPDATE_CLAIM_PUBKEY = Template('update_claim+pay_pubkey_hash', (
-            UPDATE_CLAIM_OPCODES + BaseOutputScript.PAY_PUBKEY_HASH.opcodes
+        UPDATE_CLAIM_OPCODES + BaseOutputScript.PAY_PUBKEY_HASH.opcodes
     ))
     UPDATE_CLAIM_SCRIPT = Template('update_claim+pay_script_hash', (
-            UPDATE_CLAIM_OPCODES + BaseOutputScript.PAY_SCRIPT_HASH.opcodes
+        UPDATE_CLAIM_OPCODES + BaseOutputScript.PAY_SCRIPT_HASH.opcodes
     ))
 
-    PURCHASE_CLAIM_OPCODES = (
+    SELL_SCRIPT = Template('sell_script', (
-        OP_PURCHASE_CLAIM, PUSH_SINGLE('claim_id'), OP_2DROP
+        OP_VERIFY, OP_DROP, OP_DROP, OP_DROP, PUSH_INTEGER('price'), OP_PRICECHECK
-    )
-    PURCHASE_CLAIM_PUBKEY = Template('purchase_claim+pay_pubkey_hash', (
-            PURCHASE_CLAIM_OPCODES + BaseOutputScript.PAY_PUBKEY_HASH.opcodes
-    ))
-    PURCHASE_CLAIM_SCRIPT = Template('purchase_claim+pay_script_hash', (
-            PURCHASE_CLAIM_OPCODES + BaseOutputScript.PAY_SCRIPT_HASH.opcodes
     ))
+    SELL_CLAIM = Template('sell_claim+pay_script_hash', (
+        OP_SELL_CLAIM, PUSH_SINGLE('claim_id'), PUSH_SUBSCRIPT('sell_script', SELL_SCRIPT),
+        PUSH_SUBSCRIPT('receive_script', BaseInputScript.REDEEM_SCRIPT), OP_2DROP, OP_2DROP
+    ) + BaseOutputScript.PAY_SCRIPT_HASH.opcodes)
+
+    BUY_CLAIM = Template('buy_claim+pay_script_hash', (
+        OP_BUY_CLAIM, PUSH_SINGLE('sell_id'),
+        PUSH_SINGLE('claim_id'), PUSH_SINGLE('claim_version'),
+        PUSH_SINGLE('owner_pubkey_hash'), PUSH_SINGLE('negotiation_signature'),
+        OP_2DROP, OP_2DROP, OP_2DROP,
+    ) + BaseOutputScript.PAY_SCRIPT_HASH.opcodes)
 
     templates = BaseOutputScript.templates + [
         CLAIM_NAME_PUBKEY,
@@ -64,8 +75,8 @@ class OutputScript(BaseOutputScript):
         SUPPORT_CLAIM_SCRIPT,
         UPDATE_CLAIM_PUBKEY,
         UPDATE_CLAIM_SCRIPT,
-        PURCHASE_CLAIM_PUBKEY,
+        SELL_CLAIM, SELL_SCRIPT,
-        PURCHASE_CLAIM_SCRIPT
+        BUY_CLAIM,
     ]
 
     @classmethod
@@ -76,13 +87,6 @@ class OutputScript(BaseOutputScript):
             'pubkey_hash': pubkey_hash
         })
 
-    @classmethod
-    def purchase_claim_pubkey_hash(cls, claim_id, pubkey_hash):
-        return cls(template=cls.PURCHASE_CLAIM_PUBKEY, values={
-            'claim_id': claim_id,
-            'pubkey_hash': pubkey_hash
-        })
-
     @classmethod
     def pay_update_claim_pubkey_hash(cls, claim_name, claim_id, claim, pubkey_hash):
         return cls(template=cls.UPDATE_CLAIM_PUBKEY, values={
@@ -92,6 +96,30 @@ class OutputScript(BaseOutputScript):
             'pubkey_hash': pubkey_hash
         })
 
+    @classmethod
+    def sell_script(cls, price):
+        return cls(template=cls.SELL_SCRIPT, values={
+            'price': price,
+        })
+
+    @classmethod
+    def sell_claim(cls, claim_id, price, signatures, pubkeys):
+        return cls(template=cls.SELL_CLAIM, values={
+            'claim_id': claim_id,
+            'sell_script': OutputScript.sell_script(price),
+            'receive_script': InputScript.redeem_script(signatures, pubkeys)
+        })
+
+    @classmethod
+    def buy_claim(cls, sell_id, claim_id, claim_version, owner_pubkey_hash, negotiation_signature):
+        return cls(template=cls.BUY_CLAIM, values={
+            'sell_id': sell_id,
+            'claim_id': claim_id,
+            'claim_version': claim_version,
+            'owner_pubkey_hash': owner_pubkey_hash,
+            'negotiation_signature': negotiation_signature,
+        })
+
     @property
     def is_claim_name(self):
         return self.template.name.startswith('claim_name+')
@@ -105,12 +133,16 @@ class OutputScript(BaseOutputScript):
         return self.template.name.startswith('support_claim+')
 
     @property
-    def is_purchase_claim(self):
+    def is_sell_claim(self):
-        return self.template.name.startswith('purchase_claim+')
+        return self.template.name.startswith('sell_claim+')
+
+    @property
+    def is_buy_claim(self):
+        return self.template.name.startswith('buy_claim+')
 
     @property
     def is_claim_involved(self):
         return any((
-            self.is_claim_name, self.is_support_claim,
+            self.is_claim_name, self.is_support_claim, self.is_update_claim,
-            self.is_update_claim, self.is_purchase_claim
+            self.is_sell_claim, self.is_buy_claim
         ))