Exceptional asynchronous session types: session types without tiers

Author:

Fowler Simon1,Lindley Sam1,Morris J. Garrett2,Decova Sára1

Affiliation:

1. University of Edinburgh, UK

2. University of Kansas, USA

Abstract

Session types statically guarantee that communication complies with a protocol. However, most accounts of session typing do not account for failure, which means they are of limited use in real applications---especially distributed applications---where failure is pervasive. We present the first formal integration of asynchronous session types with exception handling in a functional programming language. We define a core calculus which satisfies preservation and progress properties, is deadlock free, confluent, and terminating. We provide the first implementation of session types with exception handling for a fully-fledged functional programming language, by extending the Links web programming language; our implementation draws on existing work on effect handlers. We illustrate our approach through a running example of two-factor authentication, and a larger example of a session-based chat application where communication occurs over session-typed channels and disconnections are handled gracefully.

Funder

Engineering and Physical Sciences Research Council

Publisher

Association for Computing Machinery (ACM)

Subject

Safety, Risk, Reliability and Quality,Software

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1. Choral: Object-oriented Choreographic Programming;ACM Transactions on Programming Languages and Systems;2024-01-16

2. Deadlock-Free Separation Logic: Linearity Yields Progress for Dependent Higher-Order Message Passing;Proceedings of the ACM on Programming Languages;2024-01-05

3. MAG$$\pi $$!: The Role of Replication in Typing Failure-Prone Communication;Lecture Notes in Computer Science;2024

4. Session Types with Multiple Senders Single Receiver;Dependable Software Engineering. Theories, Tools, and Applications;2023-12-15

5. Polymorphic Typestate for Session Types;International Symposium on Principles and Practice of Declarative Programming;2023-10-22

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