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Documents authored by Lagaillardie, Nicolas

Document
DOI: 10.4230/LIPIcs.ECOOP.2024.19
Fearless Asynchronous Communications with Timed Multiparty Session Protocols

Authors: Ping Hou, Nicolas Lagaillardie, and Nobuko Yoshida

Published in: LIPIcs, Volume 313, 38th European Conference on Object-Oriented Programming (ECOOP 2024)

Abstract
Session types using affinity and exception handling mechanisms have been developed to ensure the communication safety of protocols implemented in concurrent and distributed programming languages. Nevertheless, current affine session types are inadequate for specifying real-world asynchronous protocols, as they are usually imposed by time constraints which enable timeout exceptions to prevent indefinite blocking while awaiting valid messages. This paper proposes the first formal integration of affinity, time constraints, timeouts, and time-failure handling based on multiparty session types for supporting reliability in asynchronous distributed systems. With this theory, we statically guarantee that asynchronous timed communication is deadlock-free, communication safe, while being fearless - never hindered by timeout errors or abrupt terminations. To implement our theory, we introduce MultiCrusty^T, a Rust toolchain designed to facilitate the implementation of safe affine timed protocols. MultiCrusty^T leverages generic types and the time library to handle timed communications, integrated with optional types for affinity. We evaluate MultiCrusty^T by extending diverse examples from the literature to incorporate time and timeouts. We also showcase the correctness by construction of our approach by implementing various real-world use cases, including protocols from the Internet of Remote Things domain and real-time systems.
Cite as

Ping Hou, Nicolas Lagaillardie, and Nobuko Yoshida. Fearless Asynchronous Communications with Timed Multiparty Session Protocols. In 38th European Conference on Object-Oriented Programming (ECOOP 2024). Leibniz International Proceedings in Informatics (LIPIcs), Volume 313, pp. 19:1-19:30, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2024)

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@InProceedings{hou_et_al:LIPIcs.ECOOP.2024.19,
  author =	{Hou, Ping and Lagaillardie, Nicolas and Yoshida, Nobuko},
  title =	{{Fearless Asynchronous Communications with Timed Multiparty Session Protocols}},
  booktitle =	{38th European Conference on Object-Oriented Programming (ECOOP 2024)},
  pages =	{19:1--19:30},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-341-6},
  ISSN =	{1868-8969},
  year =	{2024},
  volume =	{313},
  editor =	{Aldrich, Jonathan and Salvaneschi, Guido},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ECOOP.2024.19},
  URN =		{urn:nbn:de:0030-drops-208681},
  doi =		{10.4230/LIPIcs.ECOOP.2024.19},
  annote =	{Keywords: Session Types, Concurrency, Time Failure Handling, Affinity, Timeout, Rust}
}
Document
Artifact
DOI: 10.4230/DARTS.10.2.10
Fearless Asynchronous Communications with Timed Session Types in Rust (Artifact)

Authors: Nicolas Lagaillardie, Ping Hou, and Nobuko Yoshida

Published in: DARTS, Volume 10, Issue 2, Special Issue of the 38th European Conference on Object-Oriented Programming (ECOOP 2024)

Abstract
We introduce MultiCrusty^T, a Rust toolchain designed to facilitate the implementation of safe affine timed protocols. MultiCrusty^T leverages generic types and the time library to handle timed communications, integrated with optional types for affinity. This artifact allows to evaluate our approach by running examples from the literature, real-world use cases and protocols from real-time systems, featured in the related article, showcasing the correctness by construction of our approach. We allow to see the performance of our solution by running benchmarks and generating graphs, highlighting a less than 10% compile-time and runtime overhead compared with an untimed implementation. We also demonstrate how to implement, step by step, your own timed protocols, from a very basic one with only two parties and simple interactions, to complex ones with more than three parties, choices and recursion.
Cite as

Nicolas Lagaillardie, Ping Hou, and Nobuko Yoshida. Fearless Asynchronous Communications with Timed Session Types in Rust (Artifact). In Special Issue of the 38th European Conference on Object-Oriented Programming (ECOOP 2024). Dagstuhl Artifacts Series (DARTS), Volume 10, Issue 2, pp. 10:1-10:3, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2024)

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@Article{lagaillardie_et_al:DARTS.10.2.10,
  author =	{Lagaillardie, Nicolas and Hou, Ping and Yoshida, Nobuko},
  title =	{{Fearless Asynchronous Communications with Timed Session Types in Rust (Artifact)}},
  pages =	{10:1--10:3},
  journal =	{Dagstuhl Artifacts Series},
  ISBN =	{978-3-95977-342-3},
  ISSN =	{2509-8195},
  year =	{2024},
  volume =	{10},
  number =	{2},
  editor =	{Lagaillardie, Nicolas and Hou, Ping and Yoshida, Nobuko},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DARTS.10.2.10},
  URN =		{urn:nbn:de:0030-drops-209084},
  doi =		{10.4230/DARTS.10.2.10},
  annote =	{Keywords: session types, affine types, \pi-calculus, asynchrony, timeouts, failures, Rust}
}
Document
Artifact
DOI: 10.4230/DARTS.8.2.9
Stay Safe Under Panic: Affine Rust Programming with Multiparty Session Types (Artifact)

Authors: Nicolas Lagaillardie, Rumyana Neykova, and Nobuko Yoshida

Published in: DARTS, Volume 8, Issue 2, Special Issue of the 36th European Conference on Object-Oriented Programming (ECOOP 2022)

Abstract
This artifact contains a version of MultiCrusty, a Rust library designed for writing and checking communication protocols following the Affine Multiparty Session Types theory introduced in our ECOOP'22 paper. MultiCrusty can work, and should be used, with Scribble [Yoshida et al., 2014] and kMC [{Julien} {Lange} and {Nobuko} {Yoshida}, 2019]: with the former tool, users can write correct global protocols and project them onto local Rust types defined within MultiCrusty, this approach is qualified as top-down; while the latter tool allows to check local Rust types written by users, this approach is qualified as bottom-up. Our artifact contains those three tools, their respective source files, as well as the different examples and benchmarks introduced in our paper, all together within a Docker image.
Cite as

Nicolas Lagaillardie, Rumyana Neykova, and Nobuko Yoshida. Stay Safe Under Panic: Affine Rust Programming with Multiparty Session Types (Artifact). In Special Issue of the 36th European Conference on Object-Oriented Programming (ECOOP 2022). Dagstuhl Artifacts Series (DARTS), Volume 8, Issue 2, pp. 9:1-9:16, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2022)

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@Article{lagaillardie_et_al:DARTS.8.2.9,
  author =	{Lagaillardie, Nicolas and Neykova, Rumyana and Yoshida, Nobuko},
  title =	{{Stay Safe Under Panic: Affine Rust Programming with Multiparty Session Types (Artifact)}},
  pages =	{9:1--9:16},
  journal =	{Dagstuhl Artifacts Series},
  ISSN =	{2509-8195},
  year =	{2022},
  volume =	{8},
  number =	{2},
  editor =	{Lagaillardie, Nicolas and Neykova, Rumyana and Yoshida, Nobuko},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DARTS.8.2.9},
  URN =		{urn:nbn:de:0030-drops-162075},
  doi =		{10.4230/DARTS.8.2.9},
  annote =	{Keywords: Rust language, affine multiparty session types, failures, cancellation}
}
Document
DOI: 10.4230/LIPIcs.ECOOP.2022.4
Stay Safe Under Panic: Affine Rust Programming with Multiparty Session Types

Authors: Nicolas Lagaillardie, Rumyana Neykova, and Nobuko Yoshida

Published in: LIPIcs, Volume 222, 36th European Conference on Object-Oriented Programming (ECOOP 2022)

Abstract
Communicating systems comprise diverse software components across networks. To ensure their robustness, modern programming languages such as Rust provide both strongly typed channels, whose usage is guaranteed to be affine (at most once), and cancellation operations over binary channels. For coordinating components to correctly communicate and synchronise with each other, we use the structuring mechanism from multiparty session types, extending it with affine communication channels and implicit/explicit cancellation mechanisms. This new typing discipline, affine multiparty session types (AMPST), ensures cancellation termination of multiple, independently running components and guarantees that communication will not get stuck due to error or abrupt termination. Guided by AMPST, we implemented an automated generation tool (MultiCrusty) of Rust APIs associated with cancellation termination algorithms, by which the Rust compiler auto-detects unsafe programs. Our evaluation shows that MultiCrusty provides an efficient mechanism for communication, synchronisation and propagation of the notifications of cancellation for arbitrary processes. We have implemented several usecases, including popular application protocols (OAuth, SMTP), and protocols with exception handling patterns (circuit breaker, distributed logging).
Cite as

Nicolas Lagaillardie, Rumyana Neykova, and Nobuko Yoshida. Stay Safe Under Panic: Affine Rust Programming with Multiparty Session Types. In 36th European Conference on Object-Oriented Programming (ECOOP 2022). Leibniz International Proceedings in Informatics (LIPIcs), Volume 222, pp. 4:1-4:29, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2022)

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@InProceedings{lagaillardie_et_al:LIPIcs.ECOOP.2022.4,
  author =	{Lagaillardie, Nicolas and Neykova, Rumyana and Yoshida, Nobuko},
  title =	{{Stay Safe Under Panic: Affine Rust Programming with Multiparty Session Types}},
  booktitle =	{36th European Conference on Object-Oriented Programming (ECOOP 2022)},
  pages =	{4:1--4:29},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-225-9},
  ISSN =	{1868-8969},
  year =	{2022},
  volume =	{222},
  editor =	{Ali, Karim and Vitek, Jan},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ECOOP.2022.4},
  URN =		{urn:nbn:de:0030-drops-162324},
  doi =		{10.4230/LIPIcs.ECOOP.2022.4},
  annote =	{Keywords: Rust language, affine multiparty session types, failures, cancellation}
}
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