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e3b86cf77d
Summary:
Implements based Rust-Python binding layer for error metadata propagation.
We introduce a new type, `TaggedExceptionData`, which carries CommonMetadata and the original (without metadata) error message for a Rust Anyhow error. This class is passed to RustError and can be accessed in Python (somewhat awkwardly) via indexing:
```
except error.RustError as e:
fault = e.args[0].fault()
typename = e.args[0].typename()
message = e.args[0].message()
```
As far as I can tell, due to limitations in cpython-rs, this can't be made more ergonomic without introducing a Python shim around the Rust binding layer, which could adapt the cpython-rs classes to use whatever API we'd like.
Currently, anyhow errors that are not otherwise special-cased will be converted into RustError, with both the original error message and any attached metadata printed as shown below
```
abort: intentional error for debugging with message 'intentional_error'
error has type name taggederror::IntentionalError and fault None
```
We can of course re-raise the error if desired to maintain the previous behavior for handling a RustError.
If we'd like other, specialized Rust Python Exception types to carry metadata (such as `IndexedLogError`), we'll need to modify them to accept a `TaggedExceptionData` like `RustError`.
Renamed the "cause an error in pure rust command" function to `debugcauserusterror`, and instead used the name `debugthrowrustexception` for a command which causes an error in rust which is converted to a Python exception across the binding layer.
Introduced a simple integration test which exercises `debugthrowrustexception`.
Added a basic handler for RustError to scmutil.py
Reviewed By: DurhamG
Differential Revision: D22517796
fbshipit-source-id: 0409489243fe739a26958aad48f608890eb93aa0
24 lines
584 B
TOML
24 lines
584 B
TOML
[package]
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name = "cpython-ext"
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version = "0.1.0"
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edition = "2018"
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[features]
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default = ["python2"]
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python2 = ["python27-sys", "cpython/python27-sys"]
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python3 = ["python3-sys", "cpython/python3-sys"]
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[dependencies]
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anyhow = "1.0.20"
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cpython = { version = "0.5", default-features = false }
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encoding = { path = "../encoding" }
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lazy_static = "1"
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libc = "0.2"
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parking_lot = "0.9"
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python27-sys = { version = "0.5", optional = true }
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python3-sys = { version = "0.5", optional = true }
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serde = "1"
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taggederror = { path = "../taggederror" }
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thiserror = "1.0.5"
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types = { path = "../types" }
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