Specify config to never change during the lifetime of the component.

imports.md

@@ -7,46 +7,27 @@
 </li>
 </ul>
 <h2><a id="wasi_config_store_0_2_0_draft"></a>Import interface wasi:config/store@0.2.0-draft</h2>
-<hr />
-<h3>Types</h3>
-<h4><a id="error"></a><code>variant error</code></h4>
-<p>An error type that encapsulates the different errors that can occur fetching configuration values.</p>
-<h5>Variant Cases</h5>
-<ul>
-<li>
-<p><a id="error.upstream"></a><code>upstream</code>: <code>string</code></p>
-<p>This indicates an error from an "upstream" config source.
-As this could be almost _anything_ (such as Vault, Kubernetes ConfigMaps, KeyValue buckets, etc),
-the error message is a string.
-</li>
-<li>
-<p><a id="error.io"></a><code>io</code>: <code>string</code></p>
-<p>This indicates an error from an I/O operation.
-As this could be almost _anything_ (such as a file read, network connection, etc),
-the error message is a string.
-Depending on how this ends up being consumed,
-we may consider moving this to use the `wasi:io/error` type instead.
-For simplicity right now in supporting multiple implementations, it is being left as a string.
-</li>
-</ul>
+<p>An immutable configuration store.</p>
 <hr />
 <h3>Functions</h3>
 <h4><a id="get"></a><code>get: func</code></h4>
 <p>Gets a configuration value of type <code>string</code> associated with the <code>key</code>.</p>
-<p>The value is returned as an <code>option&lt;string&gt;</code>. If the key is not found,
-<code>Ok(none)</code> is returned. If an error occurs, an <code>Err(error)</code> is returned.</p>
+<p>Returns <code>none</code> if the key does not exist.</p>
+<p>This always returns the same value for any given key. Configuration
+data does not change over the lifetime of the component instance.</p>
 <h5>Params</h5>
 <ul>
 <li><a id="get.key"></a><code>key</code>: <code>string</code></li>
 </ul>
 <h5>Return values</h5>
 <ul>
-<li><a id="get.0"></a> result&lt;option&lt;<code>string</code>&gt;, <a href="#error"><a href="#error"><code>error</code></a></a>&gt;</li>
+<li><a id="get.0"></a> option&lt;<code>string</code>&gt;</li>
 </ul>
 <h4><a id="get_all"></a><code>get-all: func</code></h4>
 <p>Gets a list of configuration key-value pairs of type <code>string</code>.</p>
-<p>If an error occurs, an <code>Err(error)</code> is returned.</p>
+<p>This always returns the same data. Configuration data does not change
+over the lifetime of the component instance.</p>
 <h5>Return values</h5>
 <ul>
-<li><a id="get_all.0"></a> result&lt;list&lt;(<code>string</code>, <code>string</code>)&gt;, <a href="#error"><a href="#error"><code>error</code></a></a>&gt;</li>
+<li><a id="get_all.0"></a> list&lt;(<code>string</code>, <code>string</code>)&gt;</li>
 </ul>

wit/store.wit

@@ -1,30 +1,19 @@
+/// An immutable configuration store.
 interface store {
-    /// An error type that encapsulates the different errors that can occur fetching configuration values.
-    variant error {
-        /// This indicates an error from an "upstream" config source. 
-        /// As this could be almost _anything_ (such as Vault, Kubernetes ConfigMaps, KeyValue buckets, etc), 
-        /// the error message is a string.
-        upstream(string),
-        /// This indicates an error from an I/O operation. 
-        /// As this could be almost _anything_ (such as a file read, network connection, etc), 
-        /// the error message is a string. 
-        /// Depending on how this ends up being consumed, 
-        /// we may consider moving this to use the `wasi:io/error` type instead. 
-        /// For simplicity right now in supporting multiple implementations, it is being left as a string.
-        io(string),
-    }
-
     /// Gets a configuration value of type `string` associated with the `key`. 
-    /// 
-    /// The value is returned as an `option<string>`. If the key is not found,
-    /// `Ok(none)` is returned. If an error occurs, an `Err(error)` is returned.
+    ///
+    /// Returns `none` if the key does not exist.
+    ///
+    /// This always returns the same value for any given key. Configuration
+    /// data does not change over the lifetime of the component instance.
     get: func(
         /// A string key to fetch
         key: string
-    ) -> result<option<string>, error>;
+    ) -> option<string>;
 
     /// Gets a list of configuration key-value pairs of type `string`.
-    /// 
-    /// If an error occurs, an `Err(error)` is returned.
-    get-all: func() -> result<list<tuple<string, string>>, error>;
+    ///
+    /// This always returns the same data. Configuration data does not change
+    /// over the lifetime of the component instance.
+    get-all: func() -> list<tuple<string, string>>;
 }