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`self.accounts.read().await.get_all()` acquires a read lock and does not release it until the end of `for` loop. After that, a writer may get into the queue, e.g. because of the concurrent `add_account` call. In this case `let context_option = self.accounts.read().await.get_account(id);` tries to acquire another read lock and deadlocks because tokio RwLock is write-preferring and will not give another read lock while there is a writer in the queue. At the same time, writer never gets a write lock because the first read lock is not released. The fix is to get a single read lock for the whole `get_all_accounts()` call. This is described in <https://docs.rs/tokio/1.44.1/tokio/sync/struct.RwLock.html#method.read>: "Note that under the priority policy of RwLock, read locks are not granted until prior write locks, to prevent starvation. Therefore deadlock may occur if a read lock is held by the current task, a write lock attempt is made, and then a subsequent read lock attempt is made by the current task."
Delta Chat RPC python client
RPC client connects to standalone Delta Chat RPC server deltachat-rpc-server
and provides asynchronous interface to it.
Getting started
To use Delta Chat RPC client, first build a deltachat-rpc-server with cargo build -p deltachat-rpc-server
or download a prebuilt release.
Install it anywhere in your PATH.
Create a virtual environment if you don't have one already and activate it.
$ python -m venv env
$ . env/bin/activate
Install deltachat-rpc-client from source:
$ cd deltachat-rpc-client
$ pip install .
Testing
- Build
deltachat-rpc-serverwithcargo build -p deltachat-rpc-server. - Install tox
pip install -U tox - Run
CHATMAIL_DOMAIN=nine.testrun.org PATH="../target/debug:$PATH" tox.
Additional arguments to tox are passed to pytest, e.g. tox -- -s does not capture test output.
Using in REPL
Setup a development environment:
$ tox --devenv env
$ . env/bin/activate
$ python
>>> from deltachat_rpc_client import *
>>> rpc = Rpc()
>>> rpc.start()
>>> dc = DeltaChat(rpc)
>>> system_info = dc.get_system_info()
>>> system_info["level"]
'awesome'
>>> rpc.close()