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use std::{
collections::{HashMap, HashSet},
fs,
path::{Path, PathBuf},
};
use crate::error::OperationsError;
/// Operations are derived by reading files subdirectories per cloud /etc/tedge/operations directory
/// Each operation is a file name in one of the subdirectories
/// The file name is the operation name
type Cloud = String;
type OperationName = String;
type Operation = HashSet<OperationName>;
type OperationsMap = HashMap<Cloud, Operation>;
#[derive(Debug, Clone, PartialEq)]
pub struct Operations {
cloud: PathBuf,
operations: OperationsMap,
}
impl Operations {
pub fn try_new(dir: impl AsRef<Path>) -> Result<Self, OperationsError> {
let operations = get_operations(dir.as_ref())?;
Ok(Self {
cloud: dir.as_ref().to_path_buf(),
operations,
})
}
pub fn get_operations_list(&self, cloud: &str) -> Vec<&str> {
self.operations
.get(cloud)
.map(|operations| operations.iter().map(|k| k.as_str()).collect())
.unwrap_or_default()
}
}
fn get_clouds(dir: impl AsRef<Path>) -> Result<Vec<String>, OperationsError> {
Ok(fs::read_dir(dir)?
.map(|entry| entry.map(|e| e.path()))
.collect::<Result<Vec<PathBuf>, _>>()?
.into_iter()
.filter(|path| path.is_dir())
.map(|path| {
let filename = path.file_name();
filename.unwrap().to_str().unwrap().to_string()
})
.collect())
}
fn get_operations(dir: impl AsRef<Path>) -> Result<OperationsMap, OperationsError> {
let mut operations = OperationsMap::new();
for cloud in get_clouds(&dir)? {
let path = dir.as_ref().join(cloud.as_str());
let operations_map = fs::read_dir(&path)?
.map(|entry| entry.map(|e| e.path()))
.collect::<Result<Vec<PathBuf>, _>>()?
.into_iter()
.filter(|path| path.is_file())
.map(|path| {
let filename = path.file_name();
filename.unwrap().to_str().unwrap().to_string()
})
.collect();
operations.insert(cloud, operations_map);
}
Ok(operations)
}
#[cfg(test)]
mod tests {
use super::*;
use test_case::test_case;
#[test_case(0, false)]
#[test_case(0, true)]
#[test_case(2, false)]
#[test_case(2, true)]
fn get_clouds_tests(clouds_count: usize, files: bool) {
let operations = TestOperations::builder().with_clouds(clouds_count);
if files {
operations.with_random_file_in_clouds_directory();
}
let operations = operations.build();
let clouds = get_clouds(operations.temp_dir()).unwrap();
assert_eq!(clouds.len(), clouds_count);
}
#[test_case(0, 0)]
#[test_case(1, 1)]
#[test_case(1, 5)]
#[test_case(2, 5)]
fn get_operations_all(clouds_count: usize, ops_count: usize) {
let test_operations = TestOperations::builder()
.with_clouds(clouds_count)
.with_operations(ops_count)
.build();
let operations = get_operations(test_operations.temp_dir()).unwrap();
assert_eq!(operations.len(), clouds_count);
assert_eq!(
operations.values().map(|ops| ops.len()).sum::<usize>(),
ops_count * clouds_count
);
}
// Structs for state change with the builder pattern
// Structs for Clouds
struct Clouds(Vec<PathBuf>);
struct NoClouds;
// Structs for Operations
struct Ops(Vec<PathBuf>);
struct NoOps;
struct TestOperationsBuilder<C, O> {
temp_dir: tempfile::TempDir,
clouds: C,
operations: O,
}
impl TestOperationsBuilder<NoClouds, NoOps> {
fn new() -> Self {
Self {
temp_dir: tempfile::tempdir().unwrap(),
clouds: NoClouds,
operations: NoOps,
}
}
}
impl<O> TestOperationsBuilder<NoClouds, O> {
fn with_clouds(self, clouds_count: usize) -> TestOperationsBuilder<Clouds, O> {
let Self {
temp_dir,
operations,
..
} = self;
let mut clouds = Vec::new();
for i in 0..clouds_count {
let cloud = temp_dir.as_ref().join(format!("cloud{}", i));
fs::create_dir(&cloud).unwrap();
clouds.push(cloud);
}
TestOperationsBuilder {
temp_dir,
clouds: Clouds(clouds),
operations,
}
}
}
impl TestOperationsBuilder<Clouds, NoOps> {
fn with_operations(self, operations_count: usize) -> TestOperationsBuilder<Clouds, Ops> {
let Self {
temp_dir, clouds, ..
} = self;
let mut operations = Vec::new();
clouds.0.iter().for_each(|path| {
for i in 0..operations_count {
let file_path = path.join(format!("operation{}", i));
fs::File::create(&file_path).unwrap();
operations.push(file_path);
}
});
TestOperationsBuilder {
operations: Ops(operations),
temp_dir,
clouds,
}
}
fn build(self) -> TestOperations {
let Self {
temp_dir, clouds, ..
} = self;
TestOperations {
temp_dir,
clouds: clouds.0,
operations: Vec::new(),
}
}
}
impl<C, O> TestOperationsBuilder<C, O> {
fn with_random_file_in_clouds_directory(&self) {
let path = self.temp_dir.as_ref().join("cloudfile");
fs::File::create(path).unwrap();
}
}
impl TestOperationsBuilder<Clouds, Ops> {
fn build(self) -> TestOperations {
let Self {
temp_dir,
clouds,
operations,
} = self;
TestOperations {
temp_dir,
clouds: clouds.0,
operations: operations.0,
}
}
}
struct TestOperations {
temp_dir: tempfile::TempDir,
clouds: Vec<PathBuf>,
operations: Vec<PathBuf>,
}
impl TestOperations {
fn builder() -> TestOperationsBuilder<NoClouds, NoOps> {
TestOperationsBuilder::new()
}
fn temp_dir(&self) -> &tempfile::TempDir {
&self.temp_dir
}
fn operations(&self) -> &Vec<PathBuf> {
&self.operations
}
}
}
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