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feat: CLI get command improvements (#331)
This focuses on creating tests for the `iroh get` CLI command. The Iroh API is also improved along the way. This required more work in the underlying API to make it more testable. What's tested here is everything *except* the actual IPFS behavior -- the focus is on the behavior of the CLI and API and its interactions with the filesystem. ## trycmd tests In `iroh/tests/cmd` you can see quite a few `.trycmd` files. These describes the command-line interaction. Stuff behind `$ is a command, there's a special `? failed` indicator if the command is considered to have failed, and the output of the command is shown. New are the `.out` and `.in` directories with the same names as the `.trycmd` files. These describe the filesystem before the command runs (may be missing), and the filesystem after the command has run. This way we can describe the effects of the `iroh get` command - directories and files are supposed to be created. We can also test failure scenarios where we refuse to overwrite a directory that already exists. #269 tracks various test cases. ## `get_stream` The `get` high level CLI method has been removed from the mockable `Api` trait (read on to see where it went). Instead, a more low level but still useful API method `get_stream` has been added to the `Api` trait. This gets a stream of relative paths and `OutType`, describing the directories and files you can create. The big difference with what was there before is that it returns relative paths and doesn't calculate final destination paths -- that's up to the user of the API. ## No `async_trait` macro for `Api` trait The interactions between the `Api` trait, `mockall` macro and `async_trait` were getting so hairy I couldn't figure out how to express things anymore once I wanted to add `get_stream`. For my sanity and also to learn better how this really works underneath, I've rewritten the `Api` trait to describe itself explicitly in terms of `(Local)BoxFuture` and `(Local)_BoxStream`. It's more verbose but functionally equivalent and I could express what I wanted. ## `ApiExt` trait The `ApiExt` trait is a trait that implements the high level `get` command. It puts everything together: it handles various error conditions, accesses the stream and then writes the stream to the filesystem. It's basically `iroh get`. The `ApiExt` trait is solely intended to contain default trait methods, and is automatically available when the `Api` contract is fulfilled (if you `use` it). Factored out `save_get_stream` from `getadd.rs` to be solely concerned with turning a stream into files and directories on the files system. That makes it possible to test its behavior in isolation. ## test fixture The `get` test fixture now mocks `get_stream` and returns a fake stream made from a `Vec`. This defines the actual stuff that the CLI writes to disk. ## relative_path Now depend on the [`relative-path` crate](https://crates.io/crates/relative-path) because what the stream returns are clearly relative paths, and we want to force the user to do something with them before being able to actually write stuff.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,124 @@ | ||
| use std::path::{Path, PathBuf}; | ||
|
|
||
| use crate::{Api, IpfsPath, OutType}; | ||
| use anyhow::{anyhow, Result}; | ||
| use async_trait::async_trait; | ||
| use futures::Stream; | ||
| use futures::StreamExt; | ||
| use relative_path::RelativePathBuf; | ||
|
|
||
| #[async_trait(?Send)] | ||
| pub trait ApiExt: Api { | ||
| /// High level get, equivalent of CLI `iroh get` | ||
| async fn get<'a>( | ||
| &self, | ||
| ipfs_path: &IpfsPath, | ||
| output_path: Option<&'a Path>, | ||
| ) -> Result<PathBuf> { | ||
| if ipfs_path.cid().is_none() { | ||
| return Err(anyhow!("IPFS path does not refer to a CID")); | ||
| } | ||
| let root_path = get_root_path(ipfs_path, output_path); | ||
| if root_path.exists() { | ||
| return Err(anyhow!( | ||
| "output path {} already exists", | ||
| root_path.display() | ||
| )); | ||
| } | ||
| let blocks = self.get_stream(ipfs_path); | ||
| save_get_stream(&root_path, blocks).await?; | ||
| Ok(root_path) | ||
| } | ||
| } | ||
|
|
||
| impl<T> ApiExt for T where T: Api {} | ||
|
|
||
| /// take a stream of blocks as from `get_stream` and write them to the filesystem | ||
| async fn save_get_stream( | ||
| root_path: &Path, | ||
| blocks: impl Stream<Item = Result<(RelativePathBuf, OutType)>>, | ||
| ) -> Result<()> { | ||
| tokio::pin!(blocks); | ||
| while let Some(block) = blocks.next().await { | ||
| let (path, out) = block?; | ||
| let full_path = path.to_path(root_path); | ||
| match out { | ||
| OutType::Dir => { | ||
| tokio::fs::create_dir_all(full_path).await?; | ||
| } | ||
| OutType::Reader(mut reader) => { | ||
| if let Some(parent) = path.parent() { | ||
| tokio::fs::create_dir_all(parent.to_path(root_path)).await?; | ||
| } | ||
| let mut f = tokio::fs::File::create(full_path).await?; | ||
| tokio::io::copy(&mut reader, &mut f).await?; | ||
| } | ||
| } | ||
| } | ||
| Ok(()) | ||
| } | ||
|
|
||
| /// Given an cid and an optional output path, determine root path | ||
| fn get_root_path(ipfs_path: &IpfsPath, output_path: Option<&Path>) -> PathBuf { | ||
| match output_path { | ||
| Some(path) => path.to_path_buf(), | ||
| None => { | ||
| if ipfs_path.tail().is_empty() { | ||
| PathBuf::from(ipfs_path.cid().unwrap().to_string()) | ||
| } else { | ||
| PathBuf::from(ipfs_path.tail().last().unwrap()) | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| #[cfg(test)] | ||
| mod tests { | ||
| use super::*; | ||
| use std::str::FromStr; | ||
| use tempdir::TempDir; | ||
|
|
||
| #[tokio::test] | ||
| async fn test_save_get_stream() { | ||
| let stream = Box::pin(futures::stream::iter(vec![ | ||
| Ok((RelativePathBuf::from_path("a").unwrap(), OutType::Dir)), | ||
| Ok(( | ||
| RelativePathBuf::from_path("b").unwrap(), | ||
| OutType::Reader(Box::new(std::io::Cursor::new("hello"))), | ||
| )), | ||
| ])); | ||
| let tmp_dir = TempDir::new("test_save_get_stream").unwrap(); | ||
| save_get_stream(tmp_dir.path(), stream).await.unwrap(); | ||
| assert!(tmp_dir.path().join("a").is_dir()); | ||
| assert_eq!( | ||
| std::fs::read_to_string(tmp_dir.path().join("b")).unwrap(), | ||
| "hello" | ||
| ); | ||
| } | ||
|
|
||
| #[test] | ||
| fn test_get_root_path() { | ||
| let ipfs_path = | ||
| IpfsPath::from_str("/ipfs/QmYyQSo1c1Ym7orWxLYvCrM2EmxFTANf8wXmmE7DWjhx5N").unwrap(); | ||
| assert_eq!( | ||
| get_root_path(&ipfs_path, None), | ||
| PathBuf::from("QmYyQSo1c1Ym7orWxLYvCrM2EmxFTANf8wXmmE7DWjhx5N") | ||
| ); | ||
| assert_eq!( | ||
| get_root_path(&ipfs_path, Some(Path::new("bar"))), | ||
| PathBuf::from("bar") | ||
| ); | ||
| } | ||
|
|
||
| #[test] | ||
| fn test_get_root_path_with_tail() { | ||
| let ipfs_path = | ||
| IpfsPath::from_str("/ipfs/QmYyQSo1c1Ym7orWxLYvCrM2EmxFTANf8wXmmE7DWjhx5N/tail") | ||
| .unwrap(); | ||
| assert_eq!(get_root_path(&ipfs_path, None), PathBuf::from("tail")); | ||
| assert_eq!( | ||
| get_root_path(&ipfs_path, Some(Path::new("bar"))), | ||
| PathBuf::from("bar") | ||
| ); | ||
| } | ||
| } |
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