add cache

mumu/contract/src/main.rs

@@ -0,0 +1,38 @@
+#![cfg_attr(
+    not(target_arch = "wasm32"),
+    crate_type = "target arch should be wasm32"
+)]
+#![no_main]
+
+use casperlabs_contract::{
+    contract_api::{runtime, storage},
+    unwrap_or_revert::UnwrapOrRevert,
+};
+use casperlabs_types::{ApiError, Key, URef};
+
+const KEY: &str = "special_value";
+
+fn store(value: String) {
+    // Store `value` under a new unforgeable reference.
+    let value_ref: URef = storage::new_uref(value);
+
+    // Wrap the unforgeable reference in a value of type `Key`.
+    let value_key: Key = value_ref.into();
+
+    // Store this key under the name "special_value" in context-local storage.
+    runtime::put_key(KEY, value_key);
+}
+
+// All session code must have a `call` entrypoint.
+#[no_mangle]
+pub extern "C" fn call() {
+    // Get the optional first argument supplied to the argument.
+    let value: String = runtime::get_arg(0)
+        // Unwrap the `Option`, returning an error if there was no argument supplied.
+        .unwrap_or_revert_with(ApiError::MissingArgument)
+        // Unwrap the `Result` containing the deserialized argument or return an error if there was
+        // a deserialization error.
+        .unwrap_or_revert_with(ApiError::InvalidArgument);
+
+    store(value);
+}