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https://github.com/metabarcoding/obitools4.git
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Eric Coissac
8c7017a99d
- Update obioptions.Version from "Release 4.4.29" to "/v/ Release v5" - Update version.txt from 4.29 → .30 (automated by Makefile)
38 lines
1.7 KiB
Markdown
38 lines
1.7 KiB
Markdown
## `obiutils.DownloadFile` — Semantic Feature Overview
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- **Core Functionality**: Downloads a file from a given URL to a specified local path.
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- **HTTP Client Behavior**:
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- Uses `http.Get()` for simple, synchronous GET requests.
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- Validates the HTTP status code; aborts on non-200 responses with a descriptive error.
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- **Resource Management**:
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- Ensures proper cleanup via `defer resp.Body.Close()` and `defer out.Close()`.
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- **Progress Tracking**:
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- Integrates [`progressbar`](https://github.com/schollz/progressbar) to display real-time download progress.
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- Uses `DefaultBytes()` for a human-readable, byte-based indicator (e.g., "downloading 12.3 MB / 45.6 MB").
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- **Efficient I/O**:
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- Leverages `io.Copy()` with an `io.MultiWriter` to stream data directly from the HTTP response body into both:
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- The target file (`out`)
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- The progress bar (to update on each chunk written)
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- **Error Handling**:
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- Returns early with wrapped errors for network failures, HTTP non-success codes, or file I/O issues.
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- **Simplicity & Usability**:
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- Minimal API surface: only two arguments (`url`, `filepath`).
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- No external configuration needed — ideal for CLI tools or batch scripts.
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- **Assumptions**:
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- No authentication, redirects, proxies, timeouts, or retries are implemented.
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- Designed for straightforward downloads where robustness is secondary to simplicity.
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- **Typical Use Cases**:
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- CLI utilities, build scripts, CI/CD pipelines.
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- Prototyping or internal tools where advanced download features are unnecessary.
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- **Limitations**:
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- Not suitable for large-scale or production-grade downloads without enhancements (e.g., retries, concurrency control).
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