Fix: JS: Improve error handling of batch addition #510
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This patch fixes the crash, but is there a better way? |
Crash if there is an error in batch addition.
Example:
```
const usearch = require('usearch');
const index = new usearch.Index({ metric: 'l2sq', connectivity: 16, dimensions: 3 });
index.add(42n, new Float32Array([0.2, 0.6, 0.4]));
index.add(
[41n, 42n, 43n],
[[0.1, 0.6, 0.4], [0.2, 0.6, 0.4], [0.3, 0.6, 0.4]]
)
```
`42n` is duplicated, which causes an error, but then it crash.
It seems that it is not better to throw an exception during the process,
so we changed it to throw it after it is completed.
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ashvardanian
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Nov 1, 2024
javascript/lib.cpp
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| std::string error = ""; | ||
| executor_stl_t executor; | ||
| executor.fixed(tasks, [&](std::size_t /*thread_idx*/, std::size_t task_idx) { | ||
| add_result_t result = native_->add(static_cast<default_key_t>(keys[task_idx]), | ||
| vectors + task_idx * native_->dimensions()); | ||
| if (!result) | ||
| Napi::Error::New(ctx.Env(), result.error.release()).ThrowAsJavaScriptException(); | ||
| error += "<key:" + std::to_string(keys[task_idx]) + " message:" + result.error.release() + ">"; | ||
| }); | ||
| if (error.size() > 0) | ||
| Napi::Error::New(ctx.Env(), error).ThrowAsJavaScriptException(); |
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This is not thread-safe. You need a mutex to safeguard the error string. Moreover, your solution may result in a heap allocation in the default string constructor. There should be a way to avoid it.
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Thanks for the review.
I understand that adding it to a string is not a good idea, but I would like to know if there is a better way to handle errors in such cases.
Would a Python implementation be helpful?
https://github.com/unum-cloud/usearch/blob/main/python/lib.cpp#L180-L211
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Crash if there is an error in batch addition.
Example:
42nis duplicated, which causes an error, but then it crash.It seems that it is not better to throw an exception during the process, so we changed it to throw it after it is completed.