feat: with module example and api

Signed-off-by: kjuulh <contact@kjuulh.io>

.drone.yml

@@ -1,2 +0,0 @@
-kind: template
-load: cuddle-rust-cli-plan.yaml

CHANGELOG.md

@@ -1,60 +0,0 @@
-# Changelog
-All notable changes to this project will be documented in this file.
-
-The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
-and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
-
-## [Unreleased]
-
-## [0.1.0] - 2024-04-06
-
-### Added
-- update
-- update
-- update stuff
-- update
-- with drone
-- with agent db
-- with sled db and capnp
-- with sled db
-- with basic changelog
-- with basic package
-- with publish
-- with monitoring
-- with monitor
-- with extra churning repl thingy
-- with enroll
-- add initial churn
-- add simple health check
-
-### Docs
-- add notes
-
-### Other
-- *(test)* test commit
-- *(test)* test commit
-- *(test)* test commit
-- *(test)* test commit
-- Merge pull request 'chore(deps): update all dependencies' (#2) from renovate/all into main
-
-Reviewed-on: https://git.front.kjuulh.io/kjuulh/churn/pulls/2
-
-- *(deps)* update all dependencies
-- change to byte slice
-- fmt
-- fmt
-- Add renovate.json
-
-- Release churn-server v0.1.0
-
-- Release churn-agent v0.1.0
-
-- Release churn v0.1.0
-
-- Release churn v0.1.0
-
-- Release churn-domain v0.1.0, churn v0.1.0
-
-- with changelog
-- Release churn-domain v0.1.0, churn v0.1.0
-

Cargo.toml

@@ -1,5 +1,5 @@
 [workspace]
-members = ["crates/*"]
+members = ["crates/*", "examples/*"]
 resolver = "2"
 
 [workspace.package]
@@ -19,19 +19,19 @@ churn-server = { path = "crates/churn-server" }
 churn-domain = { path = "crates/churn-domain", version = "0.1.0" }
 churn-capnp = { path = "crates/churn-capnp", version = "0.1.0" }
 
-anyhow = { version = "1.0.86" }
+anyhow = { version = "1.0.71" }
 tokio = { version = "1", features = ["full"] }
 tracing = { version = "0.1", features = ["log"] }
-tracing-subscriber = { version = "0.3.18" }
+tracing-subscriber = { version = "0.3.17" }
-clap = { version = "4.5.4", features = ["derive", "env"] }
+clap = { version = "4.3.4", features = ["derive", "env"] }
 dotenv = { version = "0.15.0" }
-axum = { version = "0.7.5", features = ["macros"] }
+axum = { version = "0.6.18", features = ["macros"] }
 async-trait = "*"
 serde = {version = "1", features = ["derive"]}
 serde_json = "1"
-reqwest = {version = "0.12.4", features = ["json"]}
+reqwest = {version = "0.11.20", features = ["json"]}
-uuid = {version = "1.8.0", features = ["v4", "serde"]}
+uuid = {version = "1.4.1", features = ["v4", "serde"]}
-itertools = {version = "0.13.0"}
+itertools = {version = "0.11.0"}
-
 sled = "0.34.7"
-chrono = {version = "0.4.38", features = ["serde"]}
+chrono = {version = "0.4.26", features = ["serde"]}
+wasmtime = "12.0.1"

adapt.sh

@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+
+set -e
+
+crate=$1
+
+cargo build -p "$crate" --target wasm32-wasi --release
+
+crate_target=$(echo $crate | sed "s/-/_/g")
+
+#wasm-tools component new ./target/wasm32-wasi/debug/$crate_target.wasm \
+#    -o $crate_target.wasm #--adapt ./includes/wasi_snapshot_preview1.wasm

crates/churn-agent/Cargo.toml

@@ -7,8 +7,6 @@ version= "0.1.0"
 edition.workspace = true
 publish.workspace = true
 
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
-
 [dependencies]
 churn-domain.workspace = true
 
@@ -22,3 +20,4 @@ axum.workspace = true
 serde.workspace = true
 serde_json.workspace = true
 reqwest.workspace = true
+wasmtime.workspace = true

crates/churn-agent/src/main.rs

@@ -1,6 +1,6 @@
 mod agent;
 
-use std::net::SocketAddr;
+use std::{net::SocketAddr, path::PathBuf};
 
 use agent::AgentService;
 use anyhow::Error;
@@ -14,7 +14,7 @@ use axum::{
 use churn_domain::AgentEnrollReq;
 use clap::{Parser, Subcommand};
 use serde_json::json;
-use tokio::net::TcpListener;
+use wasmtime::{Caller, Engine, Extern, Func, Linker, Module, Store};
 
 #[derive(Parser)]
 #[command(author, version, about, long_about = None, subcommand_required = true)]
@@ -41,6 +41,19 @@ enum Commands {
         #[arg(env = "CHURN_TOKEN", long)]
         token: String,
     },
+
+    Execute {
+        #[arg(env = "CHURN_AGENT_EXE", long)]
+        exe: PathBuf,
+
+        #[command(subcommand)]
+        commands: Option<ExecuteCommands>,
+    },
+}
+
+#[derive(Subcommand)]
+enum ExecuteCommands {
+    Source,
 }
 
 #[derive(Clone, Default)]
@@ -61,8 +74,8 @@ async fn main() -> anyhow::Result<()> {
 }
 
 async fn handle_command(cmd: Command) -> anyhow::Result<()> {
-    match cmd.command {
+    match cmd.command.unwrap() {
-        Some(Commands::Daemon { host }) => {
+        Commands::Daemon { host } => {
             tracing::info!("Starting churn server");
 
             let app = Router::new()
@@ -71,19 +84,67 @@ async fn handle_command(cmd: Command) -> anyhow::Result<()> {
                 .with_state(AppState::default());
 
             tracing::info!("churn server listening on {}", host);
-            let listener = TcpListener::bind(&host).await?;
+            axum::Server::bind(&host)
-            axum::serve(listener, app.into_make_service())
+                .serve(app.into_make_service())
                 .await
                 .unwrap();
 
             Ok(())
         }
-        Some(Commands::Connect {
+        Commands::Connect {
             host: _,
             token: _,
             agent_name: _,
-        }) => todo!(),
+        } => todo!(),
-        None => todo!(),
+        Commands::Execute { exe, commands } => match commands {
+            Some(ExecuteCommands::Source) => Ok(()),
+            None => {
+                let engine = Engine::default();
+                let module = Module::from_file(&engine, exe)?;
+
+                let mut linker = Linker::new(&engine);
+                linker.func_wrap(
+                    "$root",
+                    "print",
+                    |mut caller: Caller<'_, ()>, ptr: i32, len: i32| {
+                        // Use our `caller` context to learn about the memory export of the
+                        // module which called this host function.
+                        let mem = match caller.get_export("memory") {
+                            Some(Extern::Memory(mem)) => mem,
+                            _ => panic!("failed to find host memory"),
+                        };
+
+                        // Use the `ptr` and `len` values to get a subslice of the wasm-memory
+                        // which we'll attempt to interpret as utf-8.
+                        let data = mem
+                            .data(&caller)
+                            .get(ptr as u32 as usize..)
+                            .and_then(|arr| arr.get(..len as u32 as usize));
+                        let string = match data {
+                            Some(data) => match std::str::from_utf8(data) {
+                                Ok(s) => s,
+                                Err(_) => panic!("invalid utf-8"),
+                            },
+                            None => panic!("pointer/length out of bounds"),
+                        };
+
+                        println!("Got {} from WebAssembly", string);
+                    },
+                )?;
+
+                // All wasm objects operate within the context of a "store". Each
+                // `Store` has a type parameter to store host-specific data, which in
+                // this case we're using `4` for.
+                let mut store = Store::new(&engine, ());
+                let instance = linker.instantiate(&mut store, &module)?;
+                let hello = instance.get_typed_func::<(), ()>(&mut store, "run")?;
+
+                // And finally we can call the wasm!
+                hello.call(&mut store, ())?;
+
+                Ok(())
+            }
+        },
     }
 }
 

crates/churn-capnp/Cargo.toml

@@ -16,8 +16,8 @@ uuid.workspace = true
 anyhow.workspace = true
 chrono.workspace = true
 
-capnp = "0.19.5"
+capnp = "0.17.2"
 
 
 [build-dependencies]
-capnpc = "0.19.0"
+capnpc = "0.17.2"

crates/churn-capnp/src/lib.rs

@@ -1,6 +1,6 @@
 use capnp::message::{Builder, HeapAllocator};
 use capnp::message::{ReaderOptions, TypedReader};
-use capnp::serialize::{self, BufferSegments};
+use capnp::serialize::{self, SliceSegments};
 
 use capnp::traits::Owned;
 use churn_domain::{Agent, Lease, LogEvent};
@@ -17,7 +17,7 @@ pub trait CapnpPackExt {
         serialize::write_message_to_words(builder)
     }
 
-    fn string_to_capnp<S>(mut content: &[u8]) -> TypedReader<BufferSegments<&[u8]>, S>
+    fn string_to_capnp<S>(mut content: &[u8]) -> TypedReader<SliceSegments, S>
     where
         S: Owned,
     {
@@ -47,9 +47,9 @@ impl CapnpPackExt for LogEvent {
         let log_event = log_event.get()?;
 
         Ok(Self {
-            id: uuid::Uuid::parse_str(log_event.get_id()?.to_str()?)?,
+            id: uuid::Uuid::parse_str(log_event.get_id()?)?,
-            author: log_event.get_author()?.to_string()?,
+            author: log_event.get_author()?.into(),
-            content: log_event.get_content()?.to_string()?,
+            content: log_event.get_content()?.into(),
             timestamp: chrono::DateTime::<chrono::Utc>::from_utc(
                 chrono::NaiveDateTime::from_timestamp_opt(log_event.get_datetime(), 0).unwrap(),
                 chrono::Utc,
@@ -75,7 +75,7 @@ impl CapnpPackExt for Agent {
         let item = item.get()?;
 
         Ok(Self {
-            name: item.get_name()?.to_string()?,
+            name: item.get_name()?.into(),
         })
     }
 }
@@ -98,8 +98,8 @@ impl CapnpPackExt for Lease {
         let item = item.get()?;
 
         Ok(Self {
-            id: uuid::Uuid::parse_str(item.get_id()?.to_str()?)?,
+            id: uuid::Uuid::parse_str(item.get_id()?)?,
-            lease: uuid::Uuid::parse_str(item.get_lease()?.to_str()?)?,
+            lease: uuid::Uuid::parse_str(item.get_lease()?)?,
         })
     }
 }

crates/churn-capnp/src/models_capnp.rs

@@ -128,7 +128,7 @@ pub mod log_event {
     }
   }
 
-  impl <'a,> ::capnp::traits::SetterInput<Owned<>> for Reader<'a,>  {
+  impl <'a,> ::capnp::traits::SetPointerBuilder for Reader<'a,>  {
     fn set_pointer_builder(mut pointer: ::capnp::private::layout::PointerBuilder<'_>, value: Self, canonicalize: bool) -> ::capnp::Result<()> { pointer.set_struct(&value.reader, canonicalize) }
   }
 
@@ -151,8 +151,8 @@ pub mod log_event {
       ::capnp::traits::FromPointerBuilder::get_from_pointer(self.builder.get_pointer_field(0), ::core::option::Option::None)
     }
     #[inline]
-    pub fn set_id(&mut self, value: impl ::capnp::traits::SetterInput<::capnp::text::Owned>)  {
+    pub fn set_id(&mut self, value: ::capnp::text::Reader<'_>)  {
-      ::capnp::traits::SetterInput::set_pointer_builder(self.builder.reborrow().get_pointer_field(0), value, false).unwrap()
+      self.builder.reborrow().get_pointer_field(0).set_text(value);
     }
     #[inline]
     pub fn init_id(self, size: u32) -> ::capnp::text::Builder<'a> {
@@ -167,8 +167,8 @@ pub mod log_event {
       ::capnp::traits::FromPointerBuilder::get_from_pointer(self.builder.get_pointer_field(1), ::core::option::Option::None)
     }
     #[inline]
-    pub fn set_author(&mut self, value: impl ::capnp::traits::SetterInput<::capnp::text::Owned>)  {
+    pub fn set_author(&mut self, value: ::capnp::text::Reader<'_>)  {
-      ::capnp::traits::SetterInput::set_pointer_builder(self.builder.reborrow().get_pointer_field(1), value, false).unwrap()
+      self.builder.reborrow().get_pointer_field(1).set_text(value);
     }
     #[inline]
     pub fn init_author(self, size: u32) -> ::capnp::text::Builder<'a> {
@@ -183,8 +183,8 @@ pub mod log_event {
       ::capnp::traits::FromPointerBuilder::get_from_pointer(self.builder.get_pointer_field(2), ::core::option::Option::None)
     }
     #[inline]
-    pub fn set_content(&mut self, value: impl ::capnp::traits::SetterInput<::capnp::text::Owned>)  {
+    pub fn set_content(&mut self, value: ::capnp::text::Reader<'_>)  {
-      ::capnp::traits::SetterInput::set_pointer_builder(self.builder.reborrow().get_pointer_field(2), value, false).unwrap()
+      self.builder.reborrow().get_pointer_field(2).set_text(value);
     }
     #[inline]
     pub fn init_content(self, size: u32) -> ::capnp::text::Builder<'a> {
@@ -309,11 +309,9 @@ pub mod log_event {
       encoded_node: &ENCODED_NODE,
       nonunion_members: NONUNION_MEMBERS,
       members_by_discriminant: MEMBERS_BY_DISCRIMINANT,
-      members_by_name: MEMBERS_BY_NAME,
     };
     pub static NONUNION_MEMBERS : &[u16] = &[0,1,2,3];
     pub static MEMBERS_BY_DISCRIMINANT : &[u16] = &[];
-    pub static MEMBERS_BY_NAME : &[u16] = &[1,2,3,0];
     pub const TYPE_ID: u64 = 0xe78f_0c5b_590e_1932;
   }
 }
@@ -423,7 +421,7 @@ pub mod agent {
     }
   }
 
-  impl <'a,> ::capnp::traits::SetterInput<Owned<>> for Reader<'a,>  {
+  impl <'a,> ::capnp::traits::SetPointerBuilder for Reader<'a,>  {
     fn set_pointer_builder(mut pointer: ::capnp::private::layout::PointerBuilder<'_>, value: Self, canonicalize: bool) -> ::capnp::Result<()> { pointer.set_struct(&value.reader, canonicalize) }
   }
 
@@ -446,8 +444,8 @@ pub mod agent {
       ::capnp::traits::FromPointerBuilder::get_from_pointer(self.builder.get_pointer_field(0), ::core::option::Option::None)
     }
     #[inline]
-    pub fn set_name(&mut self, value: impl ::capnp::traits::SetterInput<::capnp::text::Owned>)  {
+    pub fn set_name(&mut self, value: ::capnp::text::Reader<'_>)  {
-      ::capnp::traits::SetterInput::set_pointer_builder(self.builder.reborrow().get_pointer_field(0), value, false).unwrap()
+      self.builder.reborrow().get_pointer_field(0).set_text(value);
     }
     #[inline]
     pub fn init_name(self, size: u32) -> ::capnp::text::Builder<'a> {
@@ -515,11 +513,9 @@ pub mod agent {
       encoded_node: &ENCODED_NODE,
       nonunion_members: NONUNION_MEMBERS,
       members_by_discriminant: MEMBERS_BY_DISCRIMINANT,
-      members_by_name: MEMBERS_BY_NAME,
     };
     pub static NONUNION_MEMBERS : &[u16] = &[0];
     pub static MEMBERS_BY_DISCRIMINANT : &[u16] = &[];
-    pub static MEMBERS_BY_NAME : &[u16] = &[0];
     pub const TYPE_ID: u64 = 0xf4a4_cb97_342c_81a0;
   }
 }
@@ -637,7 +633,7 @@ pub mod lease {
     }
   }
 
-  impl <'a,> ::capnp::traits::SetterInput<Owned<>> for Reader<'a,>  {
+  impl <'a,> ::capnp::traits::SetPointerBuilder for Reader<'a,>  {
     fn set_pointer_builder(mut pointer: ::capnp::private::layout::PointerBuilder<'_>, value: Self, canonicalize: bool) -> ::capnp::Result<()> { pointer.set_struct(&value.reader, canonicalize) }
   }
 
@@ -660,8 +656,8 @@ pub mod lease {
       ::capnp::traits::FromPointerBuilder::get_from_pointer(self.builder.get_pointer_field(0), ::core::option::Option::None)
     }
     #[inline]
-    pub fn set_id(&mut self, value: impl ::capnp::traits::SetterInput<::capnp::text::Owned>)  {
+    pub fn set_id(&mut self, value: ::capnp::text::Reader<'_>)  {
-      ::capnp::traits::SetterInput::set_pointer_builder(self.builder.reborrow().get_pointer_field(0), value, false).unwrap()
+      self.builder.reborrow().get_pointer_field(0).set_text(value);
     }
     #[inline]
     pub fn init_id(self, size: u32) -> ::capnp::text::Builder<'a> {
@@ -676,8 +672,8 @@ pub mod lease {
       ::capnp::traits::FromPointerBuilder::get_from_pointer(self.builder.get_pointer_field(1), ::core::option::Option::None)
     }
     #[inline]
-    pub fn set_lease(&mut self, value: impl ::capnp::traits::SetterInput<::capnp::text::Owned>)  {
+    pub fn set_lease(&mut self, value: ::capnp::text::Reader<'_>)  {
-      ::capnp::traits::SetterInput::set_pointer_builder(self.builder.reborrow().get_pointer_field(1), value, false).unwrap()
+      self.builder.reborrow().get_pointer_field(1).set_text(value);
     }
     #[inline]
     pub fn init_lease(self, size: u32) -> ::capnp::text::Builder<'a> {
@@ -761,11 +757,9 @@ pub mod lease {
       encoded_node: &ENCODED_NODE,
       nonunion_members: NONUNION_MEMBERS,
       members_by_discriminant: MEMBERS_BY_DISCRIMINANT,
-      members_by_name: MEMBERS_BY_NAME,
     };
     pub static NONUNION_MEMBERS : &[u16] = &[0,1];
     pub static MEMBERS_BY_DISCRIMINANT : &[u16] = &[];
-    pub static MEMBERS_BY_NAME : &[u16] = &[0,1];
     pub const TYPE_ID: u64 = 0xb0d6_0854_c50e_5662;
   }
 }

crates/churn-server/src/main.rs

@@ -21,7 +21,6 @@ use event::EventService;
 use lease::LeaseService;
 use serde::Deserialize;
 use serde_json::json;
-use tokio::net::TcpListener;
 
 use crate::db::Db;
 
@@ -95,8 +94,8 @@ async fn main() -> anyhow::Result<()> {
             });
 
         tracing::info!("churn server listening on {}", host);
-        let listener = TcpListener::bind(&host).await?;
+        axum::Server::bind(&host)
-        axum::serve(listener, app.into_make_service())
+            .serve(app.into_make_service())
             .await
             .unwrap();
     }

crates/churning/Cargo.toml

@@ -6,7 +6,7 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-dagger-sdk = "0.11.0"
+dagger-sdk = "0.2.2"
-dagger-rust = {git = "https://git.front.kjuulh.io/kjuulh/dagger-components.git", ref = "main"}
+dagger-rust = "0.2.0"
 tokio.workspace = true
 eyre = "*"

crates/churning/src/main.rs

@@ -19,22 +19,21 @@ async fn main() -> eyre::Result<()> {
     let server = server
         .with_env_variable("CHURN_DATABASE", "sled")
         .with_env_variable("CHURN_SLED_PATH", "/mnt/sled")
-        .with_mounted_cache("/mnt/sled", client.cache_volume("sled"))
+        .with_mounted_cache("/mnt/sled", client.cache_volume("sled").id().await?)
         .with_exec(vec!["churn-server", "serve", "--host", "0.0.0.0:3000"])
         .with_exposed_port(3000);
 
-    let server_service = server.as_service();
+    let server_id = server.id().await?;
 
     let agent = build_container(client.clone(), "churn-agent").await?;
     let agent = agent
-        .with_service_binding("churn-server", server_service.clone())
+        .with_service_binding("churn-server", server_id.clone())
         .with_exec(vec!["churn-agent", "daemon", "--host", "0.0.0.0:3000"])
         .with_exposed_port(3000);
-    let agent_service = agent.as_service();
 
     let churning = cli
-        .with_service_binding("churn-agent", agent_service)
+        .with_service_binding("churn-agent", agent.id().await?)
-        .with_service_binding("churn-server", server_service)
+        .with_service_binding("churn-server", server_id)
         .with_env_variable("CHURN_SERVER", "http://churn-server:3000")
         .with_env_variable("CHURN_SERVER_TOKEN", "something")
         .with_env_variable("CHURN_AGENT", "http://churn-agent:3000")
@@ -53,7 +52,7 @@ async fn main() -> eyre::Result<()> {
     let stderr = churning.stderr().await?;
     println!("{stderr}");
 
-    churning.sync().await?;
+    churning.exit_code().await?;
     println!("Finished building churning...");
 
     repl(churning).await?; //.with_entrypoint(vec!["churn"])).await?;
@@ -91,7 +90,7 @@ async fn repl(container: dagger_sdk::Container) -> eyre::Result<()> {
             }
         }
 
-        match container.sync().await {
+        match container.exit_code().await {
             Ok(_) => {}
             Err(_e) => {
                 //eprintln!("encountred error: {}", e);
@@ -102,8 +101,11 @@ async fn repl(container: dagger_sdk::Container) -> eyre::Result<()> {
     Ok(())
 }
 
-async fn build_container(client: Query, bin_name: &str) -> eyre::Result<dagger_sdk::Container> {
+async fn build_container(
-    let crates = &["crates/*", "ci"];
+    client: Arc<Query>,
+    bin_name: &str,
+) -> eyre::Result<dagger_sdk::Container> {
+    let crates = &["crates/*", "ci", "examples/*"];
     let debian_deps = &[
         "libssl-dev",
         "pkg-config",

cuddle.yaml

@@ -1,24 +1,7 @@
 # yaml-language-server: $schema=https://git.front.kjuulh.io/kjuulh/cuddle/raw/branch/main/schemas/base.json
 
-base: "git@git.front.kjuulh.io:kjuulh/cuddle-rust-cli-plan.git"
+base: "git@git.front.kjuulh.io:kjuulh/cuddle-base.git"
 
 vars:
   service: "churn"
   registry: kasperhermansen
-
-please:
-  project:
-    owner: kjuulh
-    repository: churn
-    branch: main
-  settings:
-    api_url: https://git.front.kjuulh.io  
-
-components:
-  packages:
-    debian:
-      dev:
-        - capnproto
-      release:
-        - capnproto
-        

examples/agent-ping/.cargo/config.toml

@@ -0,0 +1,2 @@
+[build]
+target = "wasm32-wasi"

examples/agent-ping/Cargo.toml

@@ -0,0 +1,15 @@
+[package]
+name = "agent-ping"
+repository.workspace = true
+description.workspace = true
+readme.workspace = true
+license-file.workspace = true
+authors.workspace = true
+version.workspace = true
+edition.workspace = true
+
+[lib]
+crate-type = ["cdylib"]
+
+[dependencies]
+wit-bindgen = { git = "https://github.com/bytecodealliance/wit-bindgen", tag = "wit-bindgen-0.10.0" }

examples/agent-ping/src/lib.rs

@@ -0,0 +1,15 @@
+wit_bindgen::generate!({
+    world: "host",
+
+    exports: {
+        world: MyHost,
+    },
+});
+
+struct MyHost;
+
+impl Host for MyHost {
+    fn run() {
+        print("Hello, world!");
+    }
+}

examples/agent-ping/wit/host.wit

@@ -0,0 +1,7 @@
+package example:host
+
+world host {
+  import print: func(msg: string)
+
+  export run: func()
+}

examples/example-module/Cargo.toml

@@ -0,0 +1,16 @@
+[package]
+name = "example-module"
+repository.workspace = true
+description.workspace = true
+readme.workspace = true
+license-file.workspace = true
+authors.workspace = true
+version.workspace = true
+edition.workspace = true
+
+[lib]
+crate-type = ["cdylib"]
+
+[dependencies]
+
+

examples/example-module/src/lib.rs

@@ -0,0 +1,85 @@
+use std::any::Any;
+
+pub struct Orchestrator {}
+
+impl Orchestrator {
+    pub fn cron(&self, cron: impl AsRef<str>) -> Scheduler {
+        Scheduler {}
+    }
+
+    pub fn query(&self, query: Query) -> Response {
+        Response::Tags { list: Vec::new() }
+    }
+
+    pub fn api<A: Any>(&self, request: A) -> Response {
+        Response::Tags { list: Vec::new() }
+    }
+}
+
+pub enum Query {
+    Tags(String),
+}
+
+pub enum Response {
+    Tags { list: Vec<String> },
+}
+
+#[derive(Clone)]
+pub struct Scheduler {}
+
+pub trait Ensure {
+    type EnsureInput;
+    type EnsureOutput;
+
+    fn ensure(&self, input: Self::EnsureInput) -> Self::EnsureOutput;
+}
+
+pub trait Action {
+    type Input;
+    type Output;
+
+    fn call(&self, input: Self::Input) -> Self::Output;
+}
+
+impl Scheduler {
+    pub fn schedule<A: Action>(&self, action: A) -> Scheduler {
+        return self.clone();
+    }
+
+    pub async fn apply(&self) {}
+}
+
+pub struct DebianPkg {}
+
+impl DebianPkg {
+    pub fn require<'a>(pkgs: impl Into<Vec<&'a str>>) -> Self {
+        Self {}
+    }
+}
+impl Ensure for DebianPkg {
+    type EnsureInput = ();
+    type EnsureOutput = ();
+
+    fn ensure(&self, input: Self::EnsureInput) -> Self::EnsureOutput {}
+}
+
+impl Action for DebianPkg {
+    type Input = ();
+    type Output = ();
+
+    fn call(&self, input: Self::Input) -> Self::Output {}
+}
+
+pub async fn handle(orchestrator: Orchestrator) {
+    orchestrator
+        .cron("* * * * *")
+        .schedule(DebianPkg::require(vec!["openssl", "git"]))
+        .apply()
+        .await;
+
+    orchestrator
+        .cron("* * * * *")
+        .schedule(DebianPkg::require(vec!["openssl", "git"]))
+        .apply()
+        .await;
+}