add compression column

Cargo.lock

@@ -277,6 +277,7 @@ dependencies = [
  "tokio-rusqlite",
  "tracing",
  "tracing-subscriber",
+ "zstd",
 ]
 
 [[package]]
@@ -305,6 +306,11 @@ name = "cc"
 version = "1.0.95"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d32a725bc159af97c3e629873bb9f88fb8cf8a4867175f76dc987815ea07c83b"
+dependencies = [
+ "jobserver",
+ "libc",
+ "once_cell",
+]
 
 [[package]]
 name = "cfg-if"
@@ -882,6 +888,15 @@ version = "1.0.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "49f1f14873335454500d59611f1cf4a4b0f786f9ac11f4312a78e4cf2566695b"
 
+[[package]]
+name = "jobserver"
+version = "0.1.31"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d2b099aaa34a9751c5bf0878add70444e1ed2dd73f347be99003d4577277de6e"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "js-sys"
 version = "0.3.69"
@@ -2196,3 +2211,31 @@ dependencies = [
  "quote",
  "syn 2.0.60",
 ]
+
+[[package]]
+name = "zstd"
+version = "0.13.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2d789b1514203a1120ad2429eae43a7bd32b90976a7bb8a05f7ec02fa88cc23a"
+dependencies = [
+ "zstd-safe",
+]
+
+[[package]]
+name = "zstd-safe"
+version = "7.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1cd99b45c6bc03a018c8b8a86025678c87e55526064e38f9df301989dce7ec0a"
+dependencies = [
+ "zstd-sys",
+]
+
+[[package]]
+name = "zstd-sys"
+version = "2.0.10+zstd.1.5.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c253a4914af5bafc8fa8c86ee400827e83cf6ec01195ec1f1ed8441bf00d65aa"
+dependencies = [
+ "cc",
+ "pkg-config",
+]

Cargo.toml

@@ -20,7 +20,7 @@ clap = { version = "4.5.4", features = ["derive"] }
 futures = "0.3.30"
 kdam = "0.5.1"
 rand = "0.8.5"
-rusqlite = "0.31.0"
+rusqlite = { version = "0.31.0", features = ["vtab"] }
 serde = { version = "1.0.198", features = ["serde_derive"] }
 serde_json = "1.0.116"
 sha2 = "0.10.8"
@@ -30,3 +30,4 @@ tracing = "0.1.40"
 tracing-subscriber = "0.3.18"
 reqwest = { version = "0.12.4", features = ["json", "multipart", "blocking"] }
 hex = "0.4.3"
+zstd = "0.13.1"

src/shard/mod.rs

@@ -1,7 +1,10 @@
+pub mod shard_error;
+
 use crate::{
     axum_result_type::AxumJsonResultOf,
     request_response::store_request::{StoreRequestWithSha256, StoreResponse},
     sha256::Sha256,
+    shard::shard_error::ShardError,
 };
 use axum::{http::StatusCode, Json};
 
@@ -157,37 +160,28 @@ impl Shard {
         // create tables, indexes, etc
         self.sqlite
             .call(move |conn| {
-                conn.execute(
-                    "CREATE TABLE IF NOT EXISTS schema_version (
-                    version INTEGER PRIMARY KEY,
-                    created_at TEXT NOT NULL
-                )",
-                    [],
-                )?;
+                ensure_schema_versions_table(conn)?;
+                let schema_rows = load_schema_rows(conn)?;
 
-                let schema_row: Option<(i64, UtcDateTime)> = conn.query_row(
-                    "SELECT version, created_at FROM schema_version ORDER BY version DESC LIMIT 1",
-                    [],
-                    |row| {
-                        let ver = row.get(0)?;
-                        // let created_at_str: String = row.get(1)?;
-                        let created_at = parse_created_at_str(row.get(1)?)?;
-                        Ok((ver, created_at))
-                    }
-                ).optional()?;
-
-                if let Some((version, date_time)) = schema_row {
+                if let Some((version, date_time)) = schema_rows.first() {
                     debug!(
                         "shard {}: latest schema version: {} @ {}",
                         shard_id, version, date_time
                     );
 
-                    if version < 1 {
-                        migrate_to_version_1(conn)?;
+                    if *version == 1 {
+                        migrate_to_version_2(conn)?;
+                    } else if *version == 2 {
+                        // no-op
+                    } else {
+                        return Err(tokio_rusqlite::Error::Other(Box::new(ShardError::new(
+                            format!("shard {}: unsupported schema version {}", shard_id, version),
+                        ))));
                     }
                 } else {
                     debug!("shard {}: no schema version found, initializing", shard_id);
                     migrate_to_version_1(conn)?;
+                    migrate_to_version_2(conn)?;
                 }
                 Ok(())
             })
@@ -220,12 +214,29 @@ fn is_duplicate_entry_err(error: &rusqlite::Error) -> bool {
     false
 }
 
-fn migrate_to_version_1(conn: &rusqlite::Connection) -> Result<(), rusqlite::Error> {
+fn ensure_schema_versions_table(conn: &rusqlite::Connection) -> Result<usize, rusqlite::Error> {
     conn.execute(
-        "INSERT INTO schema_version (version, created_at) VALUES (1, ?)",
-        [chrono::Utc::now().to_rfc3339()],
-    )?;
+        "CREATE TABLE IF NOT EXISTS schema_version (
+            version INTEGER PRIMARY KEY,
+            created_at TEXT NOT NULL
+        )",
+        [],
+    )
+}
 
+fn load_schema_rows(conn: &rusqlite::Connection) -> Result<Vec<(i64, String)>, rusqlite::Error> {
+    let mut stmt = conn
+        .prepare("SELECT version, created_at FROM schema_version ORDER BY version DESC LIMIT 1")?;
+    let rows = stmt.query_map([], |row| {
+        let version = row.get(0)?;
+        let created_at = row.get(1)?;
+        Ok((version, created_at))
+    })?;
+    rows.collect()
+}
+
+fn migrate_to_version_1(conn: &rusqlite::Connection) -> Result<(), rusqlite::Error> {
+    debug!("migrating to version 1");
     conn.execute(
         "CREATE TABLE IF NOT EXISTS entries (
             sha256 BLOB PRIMARY KEY,
@@ -237,6 +248,27 @@ fn migrate_to_version_1(conn: &rusqlite::Connection) -> Result<(), rusqlite::Err
         [],
     )?;
 
+    conn.execute(
+        "INSERT INTO schema_version (version, created_at) VALUES (1, ?)",
+        [chrono::Utc::now().to_rfc3339()],
+    )?;
+
+    Ok(())
+}
+
+fn migrate_to_version_2(conn: &rusqlite::Connection) -> Result<(), rusqlite::Error> {
+    debug!("migrating to version 2");
+    conn.execute(
+        "INSERT INTO schema_version (version, created_at) VALUES (2, ?)",
+        [chrono::Utc::now().to_rfc3339()],
+    )?;
+
+    // add `compression` column to entries table
+    conn.execute(
+        "ALTER TABLE entries ADD COLUMN compression INTEGER NOT NULL DEFAULT 0",
+        [],
+    )?;
+
     Ok(())
 }
 

src/shard/shard_error.rs

@@ -0,0 +1,20 @@
+use std::{
+    error::Error,
+    fmt::{Display, Formatter},
+};
+
+#[derive(Debug)]
+pub struct ShardError {
+    pub message: String,
+}
+impl ShardError {
+    pub fn new(message: String) -> Self {
+        Self { message }
+    }
+}
+impl Display for ShardError {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{}", self.message)
+    }
+}
+impl Error for ShardError {}