proxyd: test regexp based UA/Origin exemptions

Author: asymmetric

proxyd/integration_tests/rate_limit_test.go

@@ -49,7 +49,7 @@ func TestFrontendMaxRPSLimit(t *testing.T) {
 
 	t.Run("exempt origin over limit", func(t *testing.T) {
 		h := make(http.Header)
-		h.Set("Origin", "exempt_origin")
+		h.Set("Origin", "exempt.origin.example")
 		client := NewProxydClientWithHeaders("http://127.0.0.1:8545", h)
 		_, codes := spamReqs(t, client, ethChainID, 429, 3)
 		require.Equal(t, 3, codes[200])

proxyd/integration_tests/testdata/frontend_rate_limit.toml

@@ -21,8 +21,8 @@ eth_baz = "main"
 [rate_limit]
 base_rate = 2
 base_interval = "1s"
-exempt_origins = ["exempt_origin"]
-exempt_user_agents = ["exempt_agent"]
+exempt_origins = ["origin.example"]
+exempt_user_agents = ["exempt_.*"]
 error_message = "over rate limit with special message"
 
 [rate_limit.method_overrides.eth_foobar]
@@ -32,4 +32,4 @@ interval = "1s"
 [rate_limit.method_overrides.eth_baz]
 limit = 1
 interval = "1s"
-global = true
+global = true