Merge branch 'master' into update-grpc

Makefile

@@ -1,5 +1,10 @@
+UNAME_S = $(shell uname -s)
 
-CFLAGS = -Xcc -ISources/BoringSSL/include
+ifeq ($(UNAME_S),Linux)
+  CFLAGS = -Xcc -DTSI_OPENSSL_ALPN_SUPPORT=0
+else
+  CFLAGS = -Xcc -ISources/BoringSSL/include
+endif
 
 all:
 	swift build -v $(CFLAGS)

Package.swift

@@ -17,21 +17,44 @@
  */
 import PackageDescription
 
+var dependencies: [Package.Dependency] = [
+  .package(url: "https://github.com/apple/swift-protobuf.git", from: "1.0.2"),
+  .package(url: "https://github.com/kylef/Commander.git", from: "0.8.0")
+]
+
+var cGRPCDependencies: [Target.Dependency] = []
+#if os(Linux)
+// On Linux, Foundation links with openssl, so we'll need to use that instead of BoringSSL.
+// See https://github.com/apple/swift-nio-ssl/issues/16#issuecomment-392705505 for details.
+dependencies.append(.package(url: "https://github.com/apple/swift-nio-ssl-support.git", from: "1.0.0"))
+#else
+cGRPCDependencies.append("BoringSSL")
+#endif
+
+/*
+ * `swift-nio-zlib-support` uses `pkgConfig` to find `zlib` on 
+ * non-Apple platforms. Details here: 
+ * https://github.com/apple/swift-nio-zlib-support/issues/2#issuecomment-384681975
+ * 
+ * This doesn't play well with Macports, so require it only for non-Apple
+ * platforms, until there is a better solution. 
+ * Issue: https://github.com/grpc/grpc-swift/issues/220
+ */
+#if !os(macOS)
+dependencies.append(.package(url: "https://github.com/apple/swift-nio-zlib-support.git", from: "1.0.0"))
+#endif
+
 let package = Package(
   name: "SwiftGRPC",
   products: [
     .library(name: "SwiftGRPC", targets: ["SwiftGRPC"]),
   ],
-  dependencies: [
-    .package(url: "https://github.com/apple/swift-protobuf.git", from: "1.0.2"),
-    .package(url: "https://github.com/kylef/Commander.git", from: "0.8.0"),
-    .package(url: "https://github.com/apple/swift-nio-zlib-support.git", from: "1.0.0")
-  ],
+  dependencies: dependencies,
   targets: [
     .target(name: "SwiftGRPC",
             dependencies: ["CgRPC", "SwiftProtobuf"]),
     .target(name: "CgRPC",
-            dependencies: ["BoringSSL"]),
+            dependencies: cGRPCDependencies),
     .target(name: "RootsEncoder"),
     .target(name: "protoc-gen-swiftgrpc",
             dependencies: [

Sources/SwiftGRPC/Core/ChannelArgument.swift

@@ -71,6 +71,38 @@ public extension Channel {
     /// secure channel is an SSL channel). If this parameter is specified and the
     /// underlying is not an SSL channel, it will just be ignored.
     case sslTargetNameOverride(String)
+
+    /// Enable census for tracing and stats collection.
+    case enableCensus(Bool)
+
+    /// Enable load reporting.
+    case enableLoadReporting(Bool)
+
+    /// Request that optional features default to off (regarless of what they usually
+    /// default to) - to enable tight control over what gets enabled.
+    case enableMinimalStack(Bool)
+
+    /// Maximum number of concurrent incoming streams to allow on a http2 connection.
+    case maxConcurrentStreams(UInt)
+
+    /// Maximum message length that the channel can receive (in byts).
+    /// -1 means unlimited.
+    case maxReceiveMessageLength(Int)
+
+    /// Maximum message length that the channel can send (in bytes).
+    /// -1 means unlimited.
+    case maxSendMessageLength(Int)
+
+    /// Maximum time that a channel may have no outstanding rpcs.
+    case maxConnectionIdle(TimeInterval)
+
+    /// Maximum time that a channel may exist.
+    case maxConnectionAge(TimeInterval)
+
+    /// Enable/disable support for deadline checking.
+    /// Defaults to true, unless `enableMinimalStack` is enabled, in which case it
+    /// defaults to false.
+    case enableDeadlineChecks(Bool)
   }
 }
 
@@ -119,6 +151,24 @@ extension Channel.Argument {
       return makeArgument("grpc.http2.max_pings_without_data", value: value)
     case let .sslTargetNameOverride(value):
       return makeArgument("grpc.ssl_target_name_override", value: value)
+    case let .enableCensus(value):
+      return makeArgument("grpc.census", value: value)
+    case let .enableLoadReporting(value):
+      return makeArgument("grpc.loadreporting", value: value)
+    case let .enableMinimalStack(value):
+      return makeArgument("grpc.minimal_stack", value: value)
+    case let .maxConcurrentStreams(value):
+      return makeArgument("grpc.max_concurrent_streams", value: value)
+    case let .maxReceiveMessageLength(value):
+      return makeArgument("grpc.max_receive_message_length", value: value)
+    case let .maxSendMessageLength(value):
+      return makeArgument("grpc.max_send_message_length", value: value)
+    case let .maxConnectionIdle(value):
+      return makeArgument("grpc.max_connection_idle_ms", value: value * 1_000)
+    case let .maxConnectionAge(value):
+      return makeArgument("grpc.max_connection_age_ms", value: value * 1_000)
+    case let .enableDeadlineChecks(value):
+      return makeArgument("grpc.enable_deadline_checking", value: value)
     }
   }
 }