Merge pull request 'Refactor how things are migrated' (#461) from format-migration into main

Reviewed-on: https://git.deuxfleurs.fr/Deuxfleurs/garage/pulls/461

1 files changed, 42 insertions, 0 deletions

diff --git a/src/util/encode.rs b/src/util/encode.rs
new file mode 100644
index 00000000..1cd3198f
--- /dev/null
+++ b/src/util/encode.rs
@@ -0,0 +1,42 @@
+use serde::{Deserialize, Serialize};
+
+/// Serialize to MessagePacki, without versionning
+/// (see garage_util::migrate for functions that manage versionned
+/// data formats)
+pub fn nonversioned_encode<T>(val: &T) -> Result<Vec<u8>, rmp_serde::encode::Error>
+where
+	T: Serialize + ?Sized,
+{
+	let mut wr = Vec::with_capacity(128);
+	let mut se = rmp_serde::Serializer::new(&mut wr)
+		.with_struct_map()
+		.with_string_variants();
+	val.serialize(&mut se)?;
+	Ok(wr)
+}
+
+/// Deserialize from MessagePacki, without versionning
+/// (see garage_util::migrate for functions that manage versionned
+/// data formats)
+pub fn nonversioned_decode<T>(bytes: &[u8]) -> Result<T, rmp_serde::decode::Error>
+where
+	T: for<'de> Deserialize<'de> + ?Sized,
+{
+	rmp_serde::decode::from_read_ref::<_, T>(bytes)
+}
+
+/// Serialize to JSON, truncating long result
+pub fn debug_serialize<T: Serialize>(x: T) -> String {
+	match serde_json::to_string(&x) {
+		Ok(ss) => {
+			if ss.len() > 100 {
+				// TODO this can panic if 100 is not a codepoint boundary, but inside a 2 Bytes
+				// (or more) codepoint
+				ss[..100].to_string()
+			} else {
+				ss
+			}
+		}
+		Err(e) => format!("<JSON serialization error: {}>", e),
+	}
+}