fix: make blake2b optional

eth/precompiles/blake2.py

@@ -1,4 +1,3 @@
-import blake2b
 from eth_utils import (
     ValidationError,
 )
@@ -11,6 +10,11 @@
     BaseComputation,
 )
 
+try:
+    from blake2b import compress as blake2b_compress
+except ImportError:
+    from eth._utils.blake2.compression import blake2b_compress
+
 GAS_COST_PER_ROUND = 1
 
 
@@ -25,5 +29,5 @@ def blake2b_fcompress(computation: BaseComputation) -> BaseComputation:
 
     computation.consume_gas(gas_cost, reason=f"Blake2b Compress Precompile w/ {num_rounds} rounds")
 
-    computation.output = blake2b.compress(*parameters)
+    computation.output = blake2b_compress(*parameters)
     return computation

setup.py

@@ -5,7 +5,6 @@
 
 deps = {
     'eth': [
-        "blake2b-py>=0.1.4,<0.2",
         "cached-property>=1.5.1,<2",
         "eth-bloom>=1.0.3,<2.0.0",
         "eth-keys>=0.2.1,<0.4.0",
@@ -23,6 +22,7 @@
     # Installing these libraries may make the evm perform better than
     # using the default fallbacks though.
     'eth-extra': [
+        "blake2b-py>=0.1.4,<0.2",
         "coincurve>=13.0.0,<14.0.0",
         "eth-hash[pysha3];implementation_name=='cpython'",
         "eth-hash[pycryptodome];implementation_name=='pypy'",
@@ -77,7 +77,6 @@
 deps['dev'] = (
     deps['dev'] +
     deps['eth'] +
-    deps['eth-extra'] +
     deps['test'] +
     deps['doc'] +
     deps['lint']