Update README

README.md

@@ -5,10 +5,12 @@
 
 ## Description
 
-epp-client is a client library written in Rust for Internet domain registration and management for domain registrars.
+epp-client is a client library written in Rust for Internet domain registration
+and management for domain registrars.
 
-It supports the following basic Domain, Contact, Host, and Message management calls, with plans to add more calls
-and other EPP extensions in the future, and to eventually be RFC compliant with the EPP protocol.
+It supports the following basic Domain, Contact, Host, and Message management
+calls, with plans to add more calls and other EPP extensions in the future, and
+to eventually be RFC compliant with the EPP protocol.
 
 - Domain Check
 - Domain Create
@@ -44,45 +46,38 @@ Just add the following to your project's `Cargo.toml`
 epp-client = "0.2"
 ```
 
-## Prerequisites
-
-To use the library, you must have an `epp-client/epp-client.toml` config file with the relevant registry
-credentials in your default user configuration directory on your OS. For Linux, this is the `XDG user directory`,
-usually located at `$HOME/.config` or defined by the `XDG_CONFIG_HOME` environment variable.
-
-An example config looks like this:
-
-```toml
-[registry.verisign]
-host = 'epp.verisign-grs.com'
-port = 700
-username = 'username'
-password = 'password'
-# service extensions
-ext_uris = []
-
-[registry.verisign.tls_files]
-# the full client certificate chain in PEM format
-cert_chain = '/path/to/certificate/chain/pemfile'
-# the RSA private key for your certificate
-key = '/path/to/private/key/pemfile'
-```
-
 ## Operation
 
-Once the config is set correctly, you can create a mut variable of type `EppClient`
-with the domain registry
+You can create a mut variable of type `EppClient` with the domain registry config.
 
 ```rust
+use std::collections::HashMap;
+
+use epp_client::config::{EppClientConfig, EppClientConnection};
 use epp_client::EppClient;
 use epp_client::epp::{EppDomainCheck, EppDomainCheckResponse};
 use epp_client::epp::generate_client_tr_id;
 
 #[tokio::main]
 async fn main() {
-    // Create an instance of EppClient, specifying the name of the registry as in
-    // the config file
-    let mut client = match EppClient::new("verisign").await {
+    // Configure the client to connect to one of more registries
+    let mut registry: HashMap<String, EppClientConnection> = HashMap::new();
+    registry.insert(
+        "registry_name".to_owned(),
+        EppClientConnection {
+            host: "example.com".to_owned(),
+            port: 700,
+            username: "username".to_owned(),
+            password: "password".to_owned(),
+            ext_uris: None,
+            tls_files: None,
+        },
+    );
+    let config = EppClientConfig { registry };
+
+    // Create an instance of EppClient, passing the config and the
+    // registry you want to connect to
+    let mut client = match EppClient::new(&config, "registry_name").await {
         Ok(client) => client,
         Err(e) => panic!("Failed to create EppClient: {}",  e)
     };
@@ -103,13 +98,48 @@ async fn main() {
 }
 ```
 
-The output would look similar to the following
+The output would look similar to the following:
 
 ```
 Domain: eppdev.com, Available: 1
 Domain: eppdev.net, Available: 1
 ```
 
+You may also choose to store your configuration in something like a toml file:
+
+```toml
+[registry.verisign]
+host = 'epp.verisign-grs.com'
+port = 700
+username = 'username'
+password = 'password'
+# service extensions
+ext_uris = []
+
+[registry.verisign.tls_files]
+# the full client certificate chain in PEM format
+cert_chain = '/path/to/certificate/chain/pemfile'
+# the RSA private key for your certificate
+key = '/path/to/private/key/pemfile'
+```
+
+
+```rust
+use epp_client::config::{EppClientConfig};
+
+#[tokio::main]
+async fn main() {
+    // parse EppClientConfig from toml file
+    let config_path = Path::new("../secrets/epp-client.toml");
+    let config: EppClientConfig =
+        toml::from_str(&fs::read_to_string(config_path).await.unwrap()).unwrap();
+}
+```
+
 ## Request
 
-Currently I don't have access to a registry's OT&E account to do extensive testing. I am using [hexonet's EPP Gateway](https://wiki.hexonet.net/wiki/EPP_Gateway) for testing, but access to a registry's OT&E account would be very helpful, so if anyone could help me out with one I would be very grateful!
+Currently I don't have access to a registry's OT&E account to do extensive
+testing. I am using
+[hexonet's EPP Gateway](https://wiki.hexonet.net/wiki/EPP_Gateway) for testing,
+but access to a registry's OT&E account would be very helpful, so if anyone
+could help me out with one I would be very grateful!