Store creation time and expiry height in transactions table

- Creation time can be used in the UI before a transaction gets mined.
- Expiry height enables the UI to indicate expired transactions.

Cargo.lock

@@ -738,6 +738,7 @@ dependencies = [
  "rand 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "rusqlite 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "sapling-crypto 0.0.1 (git+https://github.com/str4d/librustzcash.git?rev=89cfef8515d5d88809c485a44fdc54572b9e5666)",
+ "time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
  "zcash_client_backend 0.0.0 (git+https://github.com/str4d/librustzcash.git?rev=89cfef8515d5d88809c485a44fdc54572b9e5666)",
  "zcash_primitives 0.0.0 (git+https://github.com/str4d/librustzcash.git?rev=89cfef8515d5d88809c485a44fdc54572b9e5666)",
  "zip32 0.0.0 (git+https://github.com/str4d/librustzcash.git?rev=89cfef8515d5d88809c485a44fdc54572b9e5666)",

Cargo.toml

@@ -17,6 +17,7 @@ log-panics = "2.0.0"
 protobuf = "2"
 rand = "0.4"
 rusqlite = { version = "0.15", features = ["bundled"] }
+time = "0.1"
 
 [dependencies.ff]
 git = "https://github.com/str4d/librustzcash.git"

src/main/rust/lib.rs

@@ -11,6 +11,7 @@ extern crate pairing;
 extern crate protobuf;
 extern crate rusqlite;
 extern crate sapling_crypto;
+extern crate time;
 extern crate zcash_client_backend;
 extern crate zcash_primitives;
 extern crate zip32;

src/main/rust/sql.rs

@@ -54,8 +54,10 @@ pub fn init_data_database(db_data: &str) -> rusqlite::Result<()> {
         "CREATE TABLE IF NOT EXISTS transactions (
             id_tx INTEGER PRIMARY KEY,
             txid BLOB NOT NULL UNIQUE,
+            created TEXT,
             block INTEGER,
             tx_index INTEGER,
+            expiry_height INTEGER,
             raw BLOB,
             FOREIGN KEY (block) REFERENCES blocks(height)
         )",
@@ -574,15 +576,21 @@ pub fn send_to_address(
     let (tx, tx_metadata) = builder.build(consensus_branch_id, prover)?;
     // We only called add_sapling_output() once.
     let output_index = tx_metadata.output_index(0).unwrap() as i64;
+    let created = time::get_time();
 
     // Save the transaction in the database.
     let mut raw_tx = vec![];
     tx.write(&mut raw_tx)?;
     let mut stmt_insert_tx = data.prepare(
-        "INSERT INTO transactions (txid, raw)
-        VALUES (?, ?)",
+        "INSERT INTO transactions (txid, created, expiry_height, raw)
+        VALUES (?, ?, ?, ?)",
     )?;
-    stmt_insert_tx.execute(&[&tx.txid().0[..], &raw_tx[..]])?;
+    stmt_insert_tx.execute(&[
+        tx.txid().0.to_sql()?,
+        created.to_sql()?,
+        tx.expiry_height.to_sql()?,
+        raw_tx.to_sql()?,
+    ])?;
     let id_tx = data.last_insert_rowid();
 
     // Save the sent note in the database.