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[api] Optimize protobuf empty message handling to reduce flash and runtime overhead (#9908)

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This commit is contained in:
J. Nick Koston
2025-07-28 12:25:07 -10:00
committed by GitHub
parent 189d20a822
commit 68f388f78e
3 changed files with 41 additions and 29 deletions
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18
script/api_protobuf/api_protobuf.py
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@@ -1772,8 +1772,13 @@ def build_message_type(
if base_class:
out = f"class {desc.name} : public {base_class} {{\n"
else:
# Determine inheritance based on whether the message needs decoding
base_class = "ProtoDecodableMessage" if needs_decode else "ProtoMessage"
# Check if message has any non-deprecated fields
has_fields = any(not field.options.deprecated for field in desc.field)
# Determine inheritance based on whether the message needs decoding and has fields
if needs_decode and has_fields:
base_class = "ProtoDecodableMessage"
else:
base_class = "ProtoMessage"
out = f"class {desc.name} : public {base_class} {{\n"
out += " public:\n"
out += indent("\n".join(public_content)) + "\n"
@@ -2039,7 +2044,14 @@ def build_service_message_type(
hout += f"virtual void {func}(const {mt.name} &value){{}};\n"
case = ""
case += f"{mt.name} msg;\n"
case += "msg.decode(msg_data, msg_size);\n"
# Check if this message has any fields (excluding deprecated ones)
has_fields = any(not field.options.deprecated for field in mt.field)
if has_fields:
# Normal case: decode the message
case += "msg.decode(msg_data, msg_size);\n"
else:
# Empty message optimization: skip decode since there are no fields
case += "// Empty message: no decode needed\n"
if log:
case += "#ifdef HAS_PROTO_MESSAGE_DUMP\n"
case += f'ESP_LOGVV(TAG, "{func}: %s", msg.dump().c_str());\n'