Work-in-progress reworking in Rust

.gitignore

@@ -1,2 +1,10 @@
 *.sw*
 node_modules/
+
+
+#Added by cargo
+#
+#already existing elements are commented out
+
+/target
+**/*.rs.bk

Cargo.toml

@@ -0,0 +1,20 @@
+[package]
+name = "contaminate"
+version = "0.1.0"
+authors = ["R. Tyler Croy <rtyler@brokenco.de>"]
+edition = "2018"
+
+[dependencies]
+# Used for serving the website
+tide = "~0.5.1"
+async-std = "~1.4.0"
+
+# Logging
+log = "~0.4.8"
+pretty_env_logger = "~0.3.1"
+
+# Handling configuration overlays
+config = { version = "~0.10.1", features = ["yaml"] }
+
+# Used for making http requests to the upstream docker registry
+surf = "~1.0.3"

README.adoc

@@ -1,27 +1,51 @@
 = Contaminate
 
-Hunting the white whale of a mutable immutable infrastructure.
+Contaminate is a caching proxy masquerading as Docker registry. It can modify
+Docker images and manifests on the fly, for those who need a little more mutability in their immutable infrastructure.
 
 
-== Environment Variables
+== Configuration
 
-[%header, cols="^1,<.^4,^1,^1"]
+Contaminate can be configured with a `contaminate.yml` file, or via specific
+environment variables which can override configuration values.
+
+=== YAML Keys
+
+[cols="^1,<.^4,^1,^1"]
+|===
+.^| Name
+.^| Default Value
+.^| Notes
+
+| `layers_dir`
+| `./layers.d`
+| A directory containing the layers to override on images passing through Contaminate.
+
+| `registry`
+| https://registry-1.docker.io
+| A Registry HTTP V2 compliant URL, reachable by Contaminate.
+
+|===
+
+=== Environment Variables
+
+[cols="^1,<.^4,^1,^1"]
 |===
 .^| Name
 .^| Default Value
 .^| Notes
 
 
-| `LAYERS_DIR`
+| `RUST_LOG`
+| `warn`
+| Log level for Contaminate logs to be printed
+
+| `CT_LAYERS_DIR`
 | `./layers.d`
-| A directory containing the layers to override on images passing through Ahab
+| A directory containing the layers to override on images passing through Contaminate.
 
-| `LOG_LEVEL`
-| `info`
-| Log level for Ahab logs to be printed
-
-| `UPSTREAM_REGISTRY`
+| `CT_REGISTRY`
 | https://registry-1.docker.io
-| A Registry HTTP V2 compliant URL, reachable by Ahab.
+| A Registry HTTP V2 compliant URL, reachable by Contaminate.
 
 |===

src/main.rs

@@ -0,0 +1,46 @@
+/**
+ * The main server entrypoint for Contaminate
+ */
+
+extern crate config;
+extern crate pretty_env_logger;
+
+use async_std::task;
+use log::*;
+
+/**
+ * Load the settings based on the hierarchy.
+ *
+ * First we load the configuration file (contaminate.yml) if it exists
+ * Then we look at environment variables.
+ */
+fn load_settings() -> config::Config {
+    let mut settings = config::Config::default();
+    settings.set_default("registry", "https://registry-1.docker.io")
+        .expect("Could not set the default for `registry`");
+    settings.set_default("layers_dir", "./layers.d")
+        .expect("Could not set the default for `layers_dir`");
+
+    settings
+        .merge(config::File::with_name("contaminate").required(false))
+        .expect("Failed to load settings in contaminate.ymll")
+        .merge(config::Environment::with_prefix("CT"))
+        .expect("Failed to load settings defined by CT_* env vars");
+
+    return settings;
+}
+
+fn main() -> Result<(), std::io::Error> {
+    pretty_env_logger::init();
+
+    task::block_on(async {
+        let mut app = tide::new();
+        app.at("/").get(|_| async move { "Hello, world!" });
+        app.listen("127.0.0.1:9000").await?;
+        Ok(())
+    })
+}
+
+#[cfg(test)]
+mod tests {
+}