fix: logging long lines from EOSdash (#843)

Truncate long lines on logging from EOSdash.
Rate limit log messages from EOSdash to prevent overload.
Log messages read and dropped to avoid EOSdash is blocked on
standard or error output.

Signed-off-by: Bobby Noelte <b0661n0e17e@gmail.com>

tests/test_server.py

@@ -10,6 +10,7 @@ import psutil
 import pytest
 import requests
 from conftest import cleanup_eos_eosdash
+from loguru import logger
 
 from akkudoktoreos.core.version import __version__
 from akkudoktoreos.server.server import get_default_host, wait_for_port_free
@@ -46,6 +47,73 @@ class TestServer:
 
 class TestServerStartStop:
 
+    @pytest.mark.asyncio
+    async def test_forward_stream_truncates_very_long_line(self, monkeypatch, tmp_path):
+        """Test logging from EOSdash can also handle very long lines."""
+
+        eos_dir = tmp_path
+        monkeypatch.setenv("EOS_DIR", str(eos_dir))
+        monkeypatch.setenv("EOS_CONFIG_DIR", str(eos_dir))
+
+        # Import after env vars are set
+        from akkudoktoreos.server.rest.starteosdash import (
+            EOSDASH_LOG_MAX_LINE_BYTES,
+            _eosdash_log_worker,
+            eosdash_log_queue,
+            forward_stream,
+        )
+
+        # ---- Ensure queue + worker are initialized ----
+        if eosdash_log_queue is None:
+            from akkudoktoreos.server.rest import starteosdash
+
+            starteosdash.eosdash_log_queue = asyncio.Queue(maxsize=10)
+            worker_task = asyncio.create_task(_eosdash_log_worker())
+        else:
+            worker_task = None
+
+        long_message = "X" * (EOSDASH_LOG_MAX_LINE_BYTES + 10_000)
+        raw_line = f"INFO some.module:123 some_func - {long_message}\n"
+        raw_bytes = raw_line.encode()
+
+        reader = asyncio.StreamReader()
+        reader.feed_data(raw_bytes)
+        reader.feed_eof()
+
+        # ---- Capture Loguru output ----
+        records = []
+
+        def sink(message):
+            records.append(message.record)
+
+        logger_id = logger.add(sink, level="INFO")
+
+        try:
+            await forward_stream(reader)
+
+            # Allow log worker to flush queue
+            await asyncio.sleep(0)
+
+        finally:
+            logger.remove(logger_id)
+
+            # Clean shutdown of worker (important for pytest)
+            if worker_task:
+                from akkudoktoreos.server.rest import starteosdash
+
+                if starteosdash.eosdash_log_queue:
+                    starteosdash.eosdash_log_queue.put_nowait(None)
+                await worker_task
+
+        # ---- Assert ----
+        assert len(records) == 1, "Expected exactly one log record"
+
+        record = records[0]
+        msg = record["message"]
+
+        assert msg.endswith("[TRUNCATED]"), "Expected truncation marker"
+        assert len(msg) <= EOSDASH_LOG_MAX_LINE_BYTES + 20
+
     @pytest.mark.asyncio
     async def test_server_start_eosdash(self, config_eos, monkeypatch, tmp_path):
         """Test the EOSdash server startup from EOS.