feat: start on specifying data structure for benchmark specification

Sponsored-by: author

3 files changed, 227 insertions, 0 deletions

diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..a773c2b
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..77ca409
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,12 @@
+[package]
+name = "obnam-benchmark"
+version = "0.1.0"
+authors = ["Lars Wirzenius <liw@liw.fi>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+serde = { version = "1.0.101", features = ["derive"] }
+serde_json = "1.0.72"
+serde_yaml = "0.8.21"
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..ba54da8
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,72 @@
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Serialize, Deserialize)]
+struct Specification {
+    benchmarks: Vec<Benchmark>,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+struct Benchmark {
+    benchmark: String,
+    backups: Vec<Backup>,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+struct Backup {
+    changes: Vec<Change>,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+enum Change {
+    Create(CreateFiles),
+    Delete(FileCount),
+    Rename(FileCount),
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+struct CreateFiles {
+    files: u64,
+    #[serde(with = "file_size")]
+    file_size: u64,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+struct FileCount {
+    files: u64,
+}
+
+fn main() {
+    let yaml = r#"
+benchmarks:
+- benchmark: foo
+  backups: []
+"#;
+    let spec: Specification = serde_yaml::from_str(yaml).unwrap();
+    serde_json::to_writer(std::io::stdout(), &spec).unwrap();
+    println!();
+}
+
+mod file_size {
+    use serde::{de::Error as _, Deserialize, Deserializer, Serialize, Serializer};
+
+    // This deserializer was originally written with u64 in mind. Then it was made generic by
+    // changing u64 to T everywhere and adding boundaries. Same with the serializer.
+    pub fn deserialize<'de, D, T>(deserializer: D) -> Result<T, D::Error>
+    where
+        D: Deserializer<'de>,
+        T: std::str::FromStr,
+        <T as std::str::FromStr>::Err: std::fmt::Display,
+    {
+        String::deserialize(deserializer)?
+            .parse::<T>()
+            .map_err(|e| D::Error::custom(format!("{}", e)))
+    }
+
+    pub fn serialize<S, T>(value: &T, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+        T: std::fmt::Display,
+    {
+        format!("{}", value).serialize(serializer)
+    }
+}