[RFC 1/3] [gdb/dap] Add logging of ignored lines

[Tom de Vries <tdevries@suse.de>]

This input sequence is accepted by DAP:
...
{"seq": 4, "type": "request", "command": "configurationDone"}Content-Length: 84
...

This input sequence has the same effect:
...
{"seq": 4, "type": "request", "command": "configurationDone"}ignorethis
Content-Length: 84
...
but the 'ignorethis' part is silently ignored.

Log the ignored bit, such that we have:
...
READ: <<<{"seq": 4, "type": "request", "command": "configurationDone"}>>>
WROTE: <<<{"request_seq": 4, "type": "response", "command": "configurationDone"
, "success": true}>>>
+++ run
IGNORED: <<<b'ignorethis'>>>
...
---
 gdb/python/lib/gdb/dap/io.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/gdb/python/lib/gdb/dap/io.py b/gdb/python/lib/gdb/dap/io.py
index 74cc82301d7..28f4d93ba46 100644
--- a/gdb/python/lib/gdb/dap/io.py
+++ b/gdb/python/lib/gdb/dap/io.py
@@ -14,8 +14,9 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 import json
+import sys
 
-from .startup import start_thread, send_gdb
+from .startup import start_thread, send_gdb, log
 
 
 def read_json(stream):
@@ -31,6 +32,8 @@ def read_json(stream):
         if line.startswith(b"Content-Length:"):
             line = line[15:].strip()
             content_length = int(line)
+            continue
+        log("IGNORED: <<<%s>>>" % line)
     data = bytes()
     while len(data) < content_length:
         new_data = stream.read(content_length - len(data))
-- 
2.35.3