Add 'syncable' feature to 'db' crate to conditionally derive serialization for Partition*

This is leading up syncing with partition support.

Cargo.toml

@@ -19,7 +19,7 @@ build = "build/version.rs"
 default = ["bundled_sqlite3", "syncable"]
 bundled_sqlite3 = ["rusqlite/bundled"]
 sqlcipher = ["rusqlite/sqlcipher", "mentat_db/sqlcipher"]
-syncable = ["mentat_tolstoy"]
+syncable = ["mentat_tolstoy", "mentat_db/syncable"]
 
 [workspace]
 members = ["tools/cli", "ffi"]

db/Cargo.toml

@@ -6,6 +6,7 @@ workspace = ".."
 [features]
 default = []
 sqlcipher = ["rusqlite/sqlcipher"]
+syncable = ["serde", "serde_json", "serde_derive"]
 
 [dependencies]
 failure = "0.1.1"
@@ -17,6 +18,9 @@ log = "0.4"
 ordered-float = "0.5"
 time = "0.1"
 petgraph = "0.4.12"
+serde = { version = "1.0", optional = true }
+serde_json = { version = "1.0", optional = true }
+serde_derive = { version = "1.0", optional = true }
 
 [dependencies.rusqlite]
 version = "0.13"

db/src/lib.rs

@@ -15,6 +15,9 @@ extern crate itertools;
 #[macro_use] extern crate lazy_static;
 #[macro_use] extern crate log;
 
+#[cfg(feature = "syncable")]
+#[macro_use] extern crate serde_derive;
+
 extern crate petgraph;
 extern crate rusqlite;
 extern crate tabwriter;

db/src/types.rs

@@ -38,6 +38,7 @@ use errors;
 
 /// Represents one partition of the entid space.
 #[derive(Clone,Debug,Eq,Hash,Ord,PartialOrd,PartialEq)]
+#[cfg_attr(feature = "syncable", derive(Serialize,Deserialize))]
 pub struct Partition {
     /// The first entid in the partition.
     pub start: i64,