Connect to directory servers in parallel using asyncio.gather()

[Copilot]

Sequential directory server connections caused slow startup. When connecting to N servers with L ms latency each, startup took N×L ms instead of ~L ms.

Changes

Maker (maker/src/maker/bot.py)

• Refactored connection loop to asyncio.gather() with return_exceptions=True
• Extracted connect_to_directory() helper for individual connections

Taker (taker/src/taker/taker.py)

• Updated MultiDirectoryClient.connect_all() to connect in parallel
• Extracted connect_to_server() helper for individual connections

Tests (taker/tests/test_parallel_connection.py)

• Added timing-based validation for parallel execution
• Added tests for partial failures and exception handling

Orderbook Watcher

• Already uses asyncio.gather() - no changes needed

Example

Before:

for dir_server in self.config.directory_servers:
    client = DirectoryClient(...)
    await client.connect()  # Blocks until complete

After:

async def connect_to_directory(dir_server: str):
    client = DirectoryClient(...)
    await client.connect()
    return node_id, client

tasks = [connect_to_directory(ds) for ds in self.config.directory_servers]
results = await asyncio.gather(*tasks, return_exceptions=True)  # All in parallel

Performance

Servers	Latency	Before	After	Speedup
3	100ms	300ms	100ms	3x
5	100ms	500ms	100ms	5x

Original prompt

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This section details on the original issue you should resolve

<issue_title>Connect to all directories simultaneously</issue_title>
<issue_description>At least the maker/taker but maybe also the orderbook watcher should try to connect to all directory servers simultaneously to speed up startup time. Something like an asyncio gather.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Connect to all directories simultaneously #15

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