HTTP: Make LimitInputStream pollable for better async compatibility

Fixes #1307

plugins/http-files/src/file_provider.vala

@@ -46,7 +46,7 @@ public class FileProvider : Dino.FileProvider, Object {
         }
     }
 
-    private class LimitInputStream : InputStream {
+    private class LimitInputStream : InputStream, PollableInputStream {
         InputStream inner;
         int64 remaining_size;
 
@@ -55,6 +55,20 @@ public class FileProvider : Dino.FileProvider, Object {
             this.remaining_size = max_size;
         }
 
+        public bool can_poll() {
+            return inner is PollableInputStream && ((PollableInputStream)inner).can_poll();
+        }
+
+        public PollableSource create_source(Cancellable? cancellable = null) {
+            if (!can_poll()) throw new IOError.NOT_SUPPORTED("Stream is not pollable");
+            return ((PollableInputStream)inner).create_source(cancellable);
+        }
+
+        public bool is_readable() {
+            if (!can_poll()) throw new IOError.NOT_SUPPORTED("Stream is not pollable");
+            return ((PollableInputStream)inner).is_readable();
+        }
+
         private ssize_t check_limit(ssize_t read) throws IOError {
             this.remaining_size -= read;
             if (remaining_size < 0) throw new IOError.FAILED("Stream length exceeded limit");
@@ -69,6 +83,11 @@ public class FileProvider : Dino.FileProvider, Object {
             return check_limit(yield inner.read_async(buffer, io_priority, cancellable));
         }
 
+        public ssize_t read_nonblocking_fn(uint8[] buffer) throws Error {
+            if (!is_readable()) throw new IOError.WOULD_BLOCK("Stream is not readable");
+            return read(buffer);
+        }
+
         public override bool close(Cancellable? cancellable = null) throws IOError {
             return inner.close(cancellable);
         }

xmpp-vala/CMakeLists.txt

@@ -7,15 +7,6 @@ find_packages(ENGINE_PACKAGES REQUIRED
     ICU
 )
 
-set(ENGINE_DEFINITIONS "")
-
-find_package(GIO)
-if(GIO_VERSION VERSION_GREATER "2.60")
-    message(STATUS "ALPN support enabled")
-    set(ENGINE_DEFINITIONS ALPN_SUPPORT)
-else()
-    message(STATUS "No ALPN support, needs GIO >= 2.60")
-endif()
 set(ENGINE_EXTRA_OPTIONS ${MAIN_EXTRA_OPTIONS} --vapidir=${CMAKE_CURRENT_SOURCE_DIR}/vapi)
 
 vala_precompile(ENGINE_VALA_C
@@ -154,8 +145,6 @@ GENERATE_HEADER
     xmpp-vala
 CUSTOM_VAPIS
     "${CMAKE_CURRENT_SOURCE_DIR}/src/glib_fixes.vapi"
-DEFINITIONS
-    ${ENGINE_DEFINITIONS}
 OPTIONS
     ${ENGINE_EXTRA_OPTIONS}
 )

xmpp-vala/src/core/direct_tls_xmpp_stream.vala

@@ -19,7 +19,7 @@ public class Xmpp.DirectTlsXmppStream : TlsXmppStream {
             debug("Connecting to %s:%i (tls)", host, port);
             IOStream? io_stream = yield client.connect_to_host_async(host, port);
             TlsConnection tls_connection = TlsClientConnection.new(io_stream, new NetworkAddress(remote_name.to_string(), port));
-#if ALPN_SUPPORT
+#if GLIB_2_60
             tls_connection.set_advertised_protocols(ADVERTISED_PROTOCOLS);
 #endif
             tls_connection.accept_certificate.connect(on_invalid_certificate);