Add deprecation warning to jsonrpc endpoints dropped in EIP 1474

web3/eth.py

@@ -24,6 +24,7 @@
 )
 from web3.utils.decorators import (
     deprecated_for,
+    deprecated_in_v5,
 )
 from web3.utils.empty import (
     empty,
@@ -374,6 +375,7 @@ def contract(self,
     def setContractFactory(self, contractFactory):
         self.defaultContractFactory = contractFactory
 
+    @deprecated_in_v5
     def getCompilers(self):
         return self.web3.manager.request_blocking("eth_getCompilers", [])
 

web3/net.py

@@ -1,6 +1,9 @@
 from web3.module import (
     Module,
 )
+from web3.utils.decorators import (
+    deprecated_in_v5,
+)
 
 
 class Net(Module):
@@ -13,6 +16,7 @@ def peerCount(self):
         return self.web3.manager.request_blocking("net_peerCount", [])
 
     @property
+    @deprecated_in_v5
     def chainId(self):
         return None
 

web3/utils/decorators.py

@@ -57,3 +57,23 @@ def wrapper(*args, **kwargs):
             return to_wrap(*args, **kwargs)
         return wrapper
     return decorator
+
+
+def deprecated_in_v5(arg):
+    '''
+    Decorate a function to be deprecated in v5
+
+    @deprecated_for_v5()
+    def toAscii(arg):
+        ...
+    '''
+    def decorator(to_wrap):
+        @functools.wraps(to_wrap)
+        def wrapper(*args, **kwargs):
+            warnings.warn(
+                "%s to be deprecated in v5" % (to_wrap.__name__),
+                category=DeprecationWarning,
+                stacklevel=2)
+            return to_wrap(*args, **kwargs)
+        return wrapper
+    return decorator