├── .github
    └── workflows
    │   └── rust.yml
├── .gitignore
├── Cargo.lock
├── Cargo.toml
├── LICENSE
├── README.md
├── echo-example.yaml
├── echoes.example.com.yaml
├── showcase.gif
└── src
    ├── crd.rs
    ├── echo.rs
    ├── finalizer.rs
    └── main.rs


/.github/workflows/rust.yml:
--------------------------------------------------------------------------------
 1 | name: Rust
 2 | 
 3 | on:
 4 |   push:
 5 |     branches: [ master ]
 6 |   pull_request:
 7 |     branches: [ master ]
 8 | 
 9 | env:
10 |   CARGO_TERM_COLOR: always
11 | 
12 | jobs:
13 |   build:
14 | 
15 |     runs-on: ubuntu-latest
16 | 
17 |     steps:
18 |     - uses: actions/checkout@v2
19 | 
20 |     - uses: debianmaster/actions-k3s@master
21 |       id: k3s
22 |       with:
23 |         version: 'latest'
24 | 
25 |     - name: Build
26 |       run: cargo build --verbose
27 | 
28 |     - name: Run tests
29 |       run: cargo test --verbose
30 | 
31 |     - name: Apply the custom resource definition
32 |       run: kubectl apply -f echoes.example.com.yaml
33 | 
34 |     - name: Run the operator
35 |       run: cargo run &
36 | 
37 |     - name: Apply the custom resource after a small pause
38 |       run: sleep 1 && kubectl apply -f echo-example.yaml
39 | 
40 |     - name: Validate that the deployment has been created after a small pause
41 |       run: sleep 1 && kubectl wait --for=condition=available --timeout=60s deployment/test-echo
42 | 
43 |     - name: Validate that the two pods have been created
44 |       run: kubectl get pods | grep "test-echo"
45 | 


--------------------------------------------------------------------------------
/.gitignore:
--------------------------------------------------------------------------------
1 | /target
2 | .idea/


--------------------------------------------------------------------------------
/Cargo.lock:
--------------------------------------------------------------------------------
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1580 |  "quote",
1581 |  "syn",
1582 | ]
1583 | 
1584 | [[package]]
1585 | name = "thiserror-impl"
1586 | version = "2.0.12"
1587 | source = "registry+https://github.com/rust-lang/crates.io-index"
1588 | checksum = "7f7cf42b4507d8ea322120659672cf1b9dbb93f8f2d4ecfd6e51350ff5b17a1d"
1589 | dependencies = [
1590 |  "proc-macro2",
1591 |  "quote",
1592 |  "syn",
1593 | ]
1594 | 
1595 | [[package]]
1596 | name = "tokio"
1597 | version = "1.45.0"
1598 | source = "registry+https://github.com/rust-lang/crates.io-index"
1599 | checksum = "2513ca694ef9ede0fb23fe71a4ee4107cb102b9dc1930f6d0fd77aae068ae165"
1600 | dependencies = [
1601 |  "backtrace",
1602 |  "bytes",
1603 |  "libc",
1604 |  "mio",
1605 |  "pin-project-lite",
1606 |  "signal-hook-registry",
1607 |  "socket2",
1608 |  "tokio-macros",
1609 |  "windows-sys 0.52.0",
1610 | ]
1611 | 
1612 | [[package]]
1613 | name = "tokio-macros"
1614 | version = "2.5.0"
1615 | source = "registry+https://github.com/rust-lang/crates.io-index"
1616 | checksum = "6e06d43f1345a3bcd39f6a56dbb7dcab2ba47e68e8ac134855e7e2bdbaf8cab8"
1617 | dependencies = [
1618 |  "proc-macro2",
1619 |  "quote",
1620 |  "syn",
1621 | ]
1622 | 
1623 | [[package]]
1624 | name = "tokio-rustls"
1625 | version = "0.26.2"
1626 | source = "registry+https://github.com/rust-lang/crates.io-index"
1627 | checksum = "8e727b36a1a0e8b74c376ac2211e40c2c8af09fb4013c60d910495810f008e9b"
1628 | dependencies = [
1629 |  "rustls",
1630 |  "tokio",
1631 | ]
1632 | 
1633 | [[package]]
1634 | name = "tokio-util"
1635 | version = "0.7.15"
1636 | source = "registry+https://github.com/rust-lang/crates.io-index"
1637 | checksum = "66a539a9ad6d5d281510d5bd368c973d636c02dbf8a67300bfb6b950696ad7df"
1638 | dependencies = [
1639 |  "bytes",
1640 |  "futures-core",
1641 |  "futures-sink",
1642 |  "pin-project-lite",
1643 |  "slab",
1644 |  "tokio",
1645 | ]
1646 | 
1647 | [[package]]
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1649 | version = "0.5.2"
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1652 | dependencies = [
1653 |  "futures-core",
1654 |  "futures-util",
1655 |  "pin-project-lite",
1656 |  "sync_wrapper",
1657 |  "tokio",
1658 |  "tokio-util",
1659 |  "tower-layer",
1660 |  "tower-service",
1661 |  "tracing",
1662 | ]
1663 | 
1664 | [[package]]
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1666 | version = "0.6.4"
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1671 |  "bitflags",
1672 |  "bytes",
1673 |  "http",
1674 |  "http-body",
1675 |  "mime",
1676 |  "pin-project-lite",
1677 |  "tower-layer",
1678 |  "tower-service",
1679 |  "tracing",
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1701 |  "pin-project-lite",
1702 |  "tracing-attributes",
1703 |  "tracing-core",
1704 | ]
1705 | 
1706 | [[package]]
1707 | name = "tracing-attributes"
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1713 |  "quote",
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1726 | [[package]]
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1728 | version = "0.2.5"
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1792 | [[package]]
1793 | name = "wasm-bindgen"
1794 | version = "0.2.100"
1795 | source = "registry+https://github.com/rust-lang/crates.io-index"
1796 | checksum = "1edc8929d7499fc4e8f0be2262a241556cfc54a0bea223790e71446f2aab1ef5"
1797 | dependencies = [
1798 |  "cfg-if",
1799 |  "once_cell",
1800 |  "rustversion",
1801 |  "wasm-bindgen-macro",
1802 | ]
1803 | 
1804 | [[package]]
1805 | name = "wasm-bindgen-backend"
1806 | version = "0.2.100"
1807 | source = "registry+https://github.com/rust-lang/crates.io-index"
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1810 |  "bumpalo",
1811 |  "log",
1812 |  "proc-macro2",
1813 |  "quote",
1814 |  "syn",
1815 |  "wasm-bindgen-shared",
1816 | ]
1817 | 
1818 | [[package]]
1819 | name = "wasm-bindgen-macro"
1820 | version = "0.2.100"
1821 | source = "registry+https://github.com/rust-lang/crates.io-index"
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1823 | dependencies = [
1824 |  "quote",
1825 |  "wasm-bindgen-macro-support",
1826 | ]
1827 | 
1828 | [[package]]
1829 | name = "wasm-bindgen-macro-support"
1830 | version = "0.2.100"
1831 | source = "registry+https://github.com/rust-lang/crates.io-index"
1832 | checksum = "8ae87ea40c9f689fc23f209965b6fb8a99ad69aeeb0231408be24920604395de"
1833 | dependencies = [
1834 |  "proc-macro2",
1835 |  "quote",
1836 |  "syn",
1837 |  "wasm-bindgen-backend",
1838 |  "wasm-bindgen-shared",
1839 | ]
1840 | 
1841 | [[package]]
1842 | name = "wasm-bindgen-shared"
1843 | version = "0.2.100"
1844 | source = "registry+https://github.com/rust-lang/crates.io-index"
1845 | checksum = "1a05d73b933a847d6cccdda8f838a22ff101ad9bf93e33684f39c1f5f0eece3d"
1846 | dependencies = [
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1848 | ]
1849 | 
1850 | [[package]]
1851 | name = "windows-link"
1852 | version = "0.1.1"
1853 | source = "registry+https://github.com/rust-lang/crates.io-index"
1854 | checksum = "76840935b766e1b0a05c0066835fb9ec80071d4c09a16f6bd5f7e655e3c14c38"
1855 | 
1856 | [[package]]
1857 | name = "windows-sys"
1858 | version = "0.52.0"
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1860 | checksum = "282be5f36a8ce781fad8c8ae18fa3f9beff57ec1b52cb3de0789201425d9a33d"
1861 | dependencies = [
1862 |  "windows-targets",
1863 | ]
1864 | 
1865 | [[package]]
1866 | name = "windows-sys"
1867 | version = "0.59.0"
1868 | source = "registry+https://github.com/rust-lang/crates.io-index"
1869 | checksum = "1e38bc4d79ed67fd075bcc251a1c39b32a1776bbe92e5bef1f0bf1f8c531853b"
1870 | dependencies = [
1871 |  "windows-targets",
1872 | ]
1873 | 
1874 | [[package]]
1875 | name = "windows-targets"
1876 | version = "0.52.6"
1877 | source = "registry+https://github.com/rust-lang/crates.io-index"
1878 | checksum = "9b724f72796e036ab90c1021d4780d4d3d648aca59e491e6b98e725b84e99973"
1879 | dependencies = [
1880 |  "windows_aarch64_gnullvm",
1881 |  "windows_aarch64_msvc",
1882 |  "windows_i686_gnu",
1883 |  "windows_i686_gnullvm",
1884 |  "windows_i686_msvc",
1885 |  "windows_x86_64_gnu",
1886 |  "windows_x86_64_gnullvm",
1887 |  "windows_x86_64_msvc",
1888 | ]
1889 | 
1890 | [[package]]
1891 | name = "windows_aarch64_gnullvm"
1892 | version = "0.52.6"
1893 | source = "registry+https://github.com/rust-lang/crates.io-index"
1894 | checksum = "32a4622180e7a0ec044bb555404c800bc9fd9ec262ec147edd5989ccd0c02cd3"
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1896 | [[package]]
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1899 | source = "registry+https://github.com/rust-lang/crates.io-index"
1900 | checksum = "09ec2a7bb152e2252b53fa7803150007879548bc709c039df7627cabbd05d469"
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1907 | 
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1909 | name = "windows_i686_gnullvm"
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1911 | source = "registry+https://github.com/rust-lang/crates.io-index"
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1913 | 
1914 | [[package]]
1915 | name = "windows_i686_msvc"
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1917 | source = "registry+https://github.com/rust-lang/crates.io-index"
1918 | checksum = "240948bc05c5e7c6dabba28bf89d89ffce3e303022809e73deaefe4f6ec56c66"
1919 | 
1920 | [[package]]
1921 | name = "windows_x86_64_gnu"
1922 | version = "0.52.6"
1923 | source = "registry+https://github.com/rust-lang/crates.io-index"
1924 | checksum = "147a5c80aabfbf0c7d901cb5895d1de30ef2907eb21fbbab29ca94c5b08b1a78"
1925 | 
1926 | [[package]]
1927 | name = "windows_x86_64_gnullvm"
1928 | version = "0.52.6"
1929 | source = "registry+https://github.com/rust-lang/crates.io-index"
1930 | checksum = "24d5b23dc417412679681396f2b49f3de8c1473deb516bd34410872eff51ed0d"
1931 | 
1932 | [[package]]
1933 | name = "windows_x86_64_msvc"
1934 | version = "0.52.6"
1935 | source = "registry+https://github.com/rust-lang/crates.io-index"
1936 | checksum = "589f6da84c646204747d1270a2a5661ea66ed1cced2631d546fdfb155959f9ec"
1937 | 
1938 | [[package]]
1939 | name = "wit-bindgen-rt"
1940 | version = "0.39.0"
1941 | source = "registry+https://github.com/rust-lang/crates.io-index"
1942 | checksum = "6f42320e61fe2cfd34354ecb597f86f413484a798ba44a8ca1165c58d42da6c1"
1943 | dependencies = [
1944 |  "bitflags",
1945 | ]
1946 | 
1947 | [[package]]
1948 | name = "zerocopy"
1949 | version = "0.8.25"
1950 | source = "registry+https://github.com/rust-lang/crates.io-index"
1951 | checksum = "a1702d9583232ddb9174e01bb7c15a2ab8fb1bc6f227aa1233858c351a3ba0cb"
1952 | dependencies = [
1953 |  "zerocopy-derive",
1954 | ]
1955 | 
1956 | [[package]]
1957 | name = "zerocopy-derive"
1958 | version = "0.8.25"
1959 | source = "registry+https://github.com/rust-lang/crates.io-index"
1960 | checksum = "28a6e20d751156648aa063f3800b706ee209a32c0b4d9f24be3d980b01be55ef"
1961 | dependencies = [
1962 |  "proc-macro2",
1963 |  "quote",
1964 |  "syn",
1965 | ]
1966 | 
1967 | [[package]]
1968 | name = "zeroize"
1969 | version = "1.8.1"
1970 | source = "registry+https://github.com/rust-lang/crates.io-index"
1971 | checksum = "ced3678a2879b30306d323f4542626697a464a97c0a07c9aebf7ebca65cd4dde"
1972 | 


--------------------------------------------------------------------------------
/Cargo.toml:
--------------------------------------------------------------------------------
 1 | [package]
 2 | name = "operator"
 3 | version = "0.1.0"
 4 | authors = ["Pavel Pscheidl <pavel2@pscheidl.cz>"]
 5 | edition = "2021"
 6 | 
 7 | [dependencies]
 8 | tokio = { version = "1.45", features = [
 9 |     "macros",
10 |     "rt-multi-thread",
11 | ] } # Macros for easy project setup and testing, multi-threaded runtime for best utilization of resources
12 | kube = { version = "1.0.0", default-features = true, features = [
13 |     "derive",
14 |     "runtime",
15 | ] } # Library for talking to Kubernetes API
16 | k8s-openapi = { version = "0.25.0", default-features = false, features = [
17 |     "v1_33",
18 | ] } # Kube-rs depends on k8s-openapi
19 | futures = "0.3"
20 | # All serde dependencies are used to serialize/deserialize CRDs and other Kubernetes-related structs
21 | serde = "1"
22 | serde_json = "1.0"
23 | schemars = "0.8"
24 | thiserror = "2"    # Custom Error definitions and convenient error mappings
25 | 


--------------------------------------------------------------------------------
/LICENSE:
--------------------------------------------------------------------------------
 1 | MIT License
 2 | 
 3 | Copyright (c) [2022] [Pavel Pscheidl]
 4 | 
 5 | Permission is hereby granted, free of charge, to any person obtaining a copy
 6 | of this software and associated documentation files (the "Software"), to deal
 7 | in the Software without restriction, including without limitation the rights
 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 9 | copies of the Software, and to permit persons to whom the Software is
10 | furnished to do so, subject to the following conditions:
11 | 
12 | The above copyright notice and this permission notice shall be included in all
13 | copies or substantial portions of the Software.
14 | 
15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 | SOFTWARE.
22 | 


--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
 1 | # Rust Kubernetes operator example
 2 | 
 3 | [![Rust](https://github.com/Pscheidl/rust-kubernetes-operator-example/actions/workflows/rust.yml/badge.svg)](https://github.com/Pscheidl/rust-kubernetes-operator-example/actions/workflows/rust.yml)
 4 | 
 5 | A Kubernetes operator built on top of [kube-rs](https://github.com/clux/kube-rs) project. There is
 6 | an [explanatory article](https://www.pavel.cool/posts/rust-kubernetes-operators/) available.
 7 | 
 8 | Steps to run on Linux:
 9 | 
10 | 1. [Install](https://www.rust-lang.org/tools/install) Rust
11 | 1. Install Kubernetes, [K3S.io](https://k3s.io/) is an excellent choice, installed simply
12 |    with `curl -sfL https://get.k3s.io | sh -`. Make sure to `sudo chown $USER /etc/rancher/k3s/k3s.yaml` if you're
13 |    accessing the Kubernetes cluster using the kubeconfig at `/etc/rancher/k3s/k3s.yaml` as non-root user.
14 |    Also, `export KUBECONFIG=/etc/rancher/k3s/k3s.yaml`, so the operator can find the kubeconfig.
15 | 1. Use `kubectl apply -f echoes.example.com.yaml` to create the CustomResourceDefinition inside Kubernetes.
16 | 1. Build the project with `cargo build`. If the build fails, make sure `libssl-dev` is available.
17 | 1. Run the operator using `cargo run`. It will run outside of the Kubernetes cluster and connect to the Kubernetes REST
18 |    API using the account inside the `KUBECONFIG` automatically.
19 | 
20 | Finally, a custom `Echo` resource can be created with `kubectl apply -f echo-example.yaml`. A new deployment of two pods
21 | with `Echo` REST API service will be created. This can be checked with the `kubectl get pods`
22 | or `kubectl get deployments` command.
23 | 
24 | ![Usage showcase](showcase.gif)
25 | 


--------------------------------------------------------------------------------
/echo-example.yaml:
--------------------------------------------------------------------------------
1 | # Example of Echo deployment. The operator will receive this specification and will create a deployment of two "echo" pods.
2 | apiVersion: example.com/v1
3 | kind: Echo # Identifier of the resource type.
4 | metadata:
5 |   name: test-echo # Name of the "Echo" custom resource instance, may be changed to your liking
6 |   namespace: default # Namespace must exist and account in KUBECONFIG must have sufficient permissions
7 | spec:
8 |   replicas: 2 # Number of "Echo" pods created.


--------------------------------------------------------------------------------
/echoes.example.com.yaml:
--------------------------------------------------------------------------------
 1 | apiVersion: apiextensions.k8s.io/v1
 2 | kind: CustomResourceDefinition
 3 | metadata:
 4 |   name: echoes.example.com
 5 |   namespace: default # For easier deployment and avoid permissions collisions on most clusters, the resource is namespace-scoped. More information at: https://kubernetes.io/docs/tasks/extend-kubernetes/custom-resources/custom-resource-definitions/
 6 | spec:
 7 |   group: example.com
 8 |   names:
 9 |     kind: Echo
10 |     plural: echoes # If not specified, Kubernetes would assume the plural is "Echos"
11 |     singular: echo
12 |     shortNames:
13 |       - echo
14 |   scope: Namespaced
15 |   versions:
16 |     - name: v1
17 |       served: true
18 |       storage: true
19 |       schema:
20 |         openAPIV3Schema:
21 |           type: object
22 |           properties:
23 |             spec: # There is only one (required) field named "replicas" specifying how many pods are created by the Operator
24 |               type: object
25 |               properties:
26 |                 replicas:
27 |                   type: integer
28 |                   format: int32
29 |               required: ["replicas"]


--------------------------------------------------------------------------------
/showcase.gif:
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/src/crd.rs:
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 1 | use kube::CustomResource;
 2 | use schemars::JsonSchema;
 3 | use serde::{Deserialize, Serialize};
 4 | 
 5 | /// Struct corresponding to the Specification (`spec`) part of the `Echo` resource, directly
 6 | /// reflects context of the `echoes.example.com.yaml` file to be found in this repository.
 7 | /// The `Echo` struct will be generated by the `CustomResource` derive macro.
 8 | #[derive(CustomResource, Serialize, Deserialize, Debug, PartialEq, Clone, JsonSchema)]
 9 | #[kube(
10 |     group = "example.com",
11 |     version = "v1",
12 |     kind = "Echo",
13 |     plural = "echoes",
14 |     derive = "PartialEq",
15 |     namespaced
16 | )]
17 | pub struct EchoSpec {
18 |     pub replicas: i32,
19 | }
20 | 


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/src/echo.rs:
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 1 | use k8s_openapi::api::apps::v1::{Deployment, DeploymentSpec};
 2 | use k8s_openapi::api::core::v1::{Container, ContainerPort, PodSpec, PodTemplateSpec};
 3 | use k8s_openapi::apimachinery::pkg::apis::meta::v1::LabelSelector;
 4 | use kube::api::{DeleteParams, ObjectMeta, PostParams};
 5 | use kube::{Api, Client, Error};
 6 | use std::collections::BTreeMap;
 7 | 
 8 | /// Creates a new deployment of `n` pods with the `inanimate/echo-server:latest` docker image inside,
 9 | /// where `n` is the number of `replicas` given.
10 | /// Note: It is assumed the resource does not already exists for simplicity. Returns an `Error` if it does.
11 | /// # Arguments
12 | /// - `client` - A Kubernetes client to create the deployment with.
13 | /// - `name` - Name of the deployment to be created
14 | /// - `replicas` - Number of pod replicas for the Deployment to contain
15 | /// - `namespace` - Namespace to create the Kubernetes Deployment in.
16 | pub async fn deploy(
17 |     client: Client,
18 |     name: &str,
19 |     replicas: i32,
20 |     namespace: &str,
21 | ) -> Result<Deployment, Error> {
22 |     let mut labels: BTreeMap<String, String> = BTreeMap::new();
23 |     labels.insert("app".to_owned(), name.to_owned());
24 | 
25 |     // Definition of the deployment. Alternatively, a YAML representation could be used as well.
26 |     let deployment: Deployment = Deployment {
27 |         metadata: ObjectMeta {
28 |             name: Some(name.to_owned()),
29 |             namespace: Some(namespace.to_owned()),
30 |             labels: Some(labels.clone()),
31 |             ..ObjectMeta::default()
32 |         },
33 |         spec: Some(DeploymentSpec {
34 |             replicas: Some(replicas),
35 |             selector: LabelSelector {
36 |                 match_expressions: None,
37 |                 match_labels: Some(labels.clone()),
38 |             },
39 |             template: PodTemplateSpec {
40 |                 spec: Some(PodSpec {
41 |                     containers: vec![Container {
42 |                         name: name.to_owned(),
43 |                         image: Some("inanimate/echo-server:latest".to_owned()),
44 |                         ports: Some(vec![ContainerPort {
45 |                             container_port: 8080,
46 |                             ..ContainerPort::default()
47 |                         }]),
48 |                         ..Container::default()
49 |                     }],
50 |                     ..PodSpec::default()
51 |                 }),
52 |                 metadata: Some(ObjectMeta {
53 |                     labels: Some(labels),
54 |                     ..ObjectMeta::default()
55 |                 }),
56 |             },
57 |             ..DeploymentSpec::default()
58 |         }),
59 |         ..Deployment::default()
60 |     };
61 | 
62 |     // Create the deployment defined above
63 |     let deployment_api: Api<Deployment> = Api::namespaced(client, namespace);
64 |     deployment_api
65 |         .create(&PostParams::default(), &deployment)
66 |         .await
67 | }
68 | 
69 | /// Deletes an existing deployment.
70 | ///
71 | /// # Arguments:
72 | /// - `client` - A Kubernetes client to delete the Deployment with
73 | /// - `name` - Name of the deployment to delete
74 | /// - `namespace` - Namespace the existing deployment resides in
75 | ///
76 | /// Note: It is assumed the deployment exists for simplicity. Otherwise returns an Error.
77 | pub async fn delete(client: Client, name: &str, namespace: &str) -> Result<(), Error> {
78 |     let api: Api<Deployment> = Api::namespaced(client, namespace);
79 |     api.delete(name, &DeleteParams::default()).await?;
80 |     Ok(())
81 | }
82 | 


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/src/finalizer.rs:
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 1 | use crate::crd::Echo;
 2 | use kube::api::{Patch, PatchParams};
 3 | use kube::{Api, Client, Error};
 4 | use serde_json::{json, Value};
 5 | 
 6 | /// Adds a finalizer record into an `Echo` kind of resource. If the finalizer already exists,
 7 | /// this action has no effect.
 8 | ///
 9 | /// # Arguments:
10 | /// - `client` - Kubernetes client to modify the `Echo` resource with.
11 | /// - `name` - Name of the `Echo` resource to modify. Existence is not verified
12 | /// - `namespace` - Namespace where the `Echo` resource with given `name` resides.
13 | ///
14 | /// Note: Does not check for resource's existence for simplicity.
15 | pub async fn add(client: Client, name: &str, namespace: &str) -> Result<Echo, Error> {
16 |     let api: Api<Echo> = Api::namespaced(client, namespace);
17 |     let finalizer: Value = json!({
18 |         "metadata": {
19 |             "finalizers": ["echoes.example.com/finalizer"]
20 |         }
21 |     });
22 | 
23 |     let patch: Patch<&Value> = Patch::Merge(&finalizer);
24 |     api.patch(name, &PatchParams::default(), &patch).await
25 | }
26 | 
27 | /// Removes all finalizers from an `Echo` resource. If there are no finalizers already, this
28 | /// action has no effect.
29 | ///
30 | /// # Arguments:
31 | /// - `client` - Kubernetes client to modify the `Echo` resource with.
32 | /// - `name` - Name of the `Echo` resource to modify. Existence is not verified
33 | /// - `namespace` - Namespace where the `Echo` resource with given `name` resides.
34 | ///
35 | /// Note: Does not check for resource's existence for simplicity.
36 | pub async fn delete(client: Client, name: &str, namespace: &str) -> Result<Echo, Error> {
37 |     let api: Api<Echo> = Api::namespaced(client, namespace);
38 |     let finalizer: Value = json!({
39 |         "metadata": {
40 |             "finalizers": null
41 |         }
42 |     });
43 | 
44 |     let patch: Patch<&Value> = Patch::Merge(&finalizer);
45 |     api.patch(name, &PatchParams::default(), &patch).await
46 | }
47 | 


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/src/main.rs:
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  1 | use std::sync::Arc;
  2 | 
  3 | use futures::stream::StreamExt;
  4 | use kube::runtime::watcher::Config;
  5 | use kube::Resource;
  6 | use kube::ResourceExt;
  7 | use kube::{client::Client, runtime::controller::Action, runtime::Controller, Api};
  8 | use tokio::time::Duration;
  9 | 
 10 | use crate::crd::Echo;
 11 | 
 12 | pub mod crd;
 13 | mod echo;
 14 | mod finalizer;
 15 | 
 16 | #[tokio::main]
 17 | async fn main() {
 18 |     // First, a Kubernetes client must be obtained using the `kube` crate
 19 |     // The client will later be moved to the custom controller
 20 |     let kubernetes_client: Client = Client::try_default()
 21 |         .await
 22 |         .expect("Expected a valid KUBECONFIG environment variable.");
 23 | 
 24 |     // Preparation of resources used by the `kube_runtime::Controller`
 25 |     let crd_api: Api<Echo> = Api::all(kubernetes_client.clone());
 26 |     let context: Arc<ContextData> = Arc::new(ContextData::new(kubernetes_client.clone()));
 27 | 
 28 |     // The controller comes from the `kube_runtime` crate and manages the reconciliation process.
 29 |     // It requires the following information:
 30 |     // - `kube::Api<T>` this controller "owns". In this case, `T = Echo`, as this controller owns the `Echo` resource,
 31 |     // - `kube::runtime::watcher::Config` can be adjusted for precise filtering of `Echo` resources before the actual reconciliation, e.g. by label,
 32 |     // - `reconcile` function with reconciliation logic to be called each time a resource of `Echo` kind is created/updated/deleted,
 33 |     // - `on_error` function to call whenever reconciliation fails.
 34 |     Controller::new(crd_api.clone(), Config::default())
 35 |         .run(reconcile, on_error, context)
 36 |         .for_each(|reconciliation_result| async move {
 37 |             match reconciliation_result {
 38 |                 Ok(echo_resource) => {
 39 |                     println!("Reconciliation successful. Resource: {:?}", echo_resource);
 40 |                 }
 41 |                 Err(reconciliation_err) => {
 42 |                     eprintln!("Reconciliation error: {:?}", reconciliation_err)
 43 |                 }
 44 |             }
 45 |         })
 46 |         .await;
 47 | }
 48 | 
 49 | /// Context injected with each `reconcile` and `on_error` method invocation.
 50 | struct ContextData {
 51 |     /// Kubernetes client to make Kubernetes API requests with. Required for K8S resource management.
 52 |     client: Client,
 53 | }
 54 | 
 55 | impl ContextData {
 56 |     /// Constructs a new instance of ContextData.
 57 |     ///
 58 |     /// # Arguments:
 59 |     /// - `client`: A Kubernetes client to make Kubernetes REST API requests with. Resources
 60 |     /// will be created and deleted with this client.
 61 |     pub fn new(client: Client) -> Self {
 62 |         ContextData { client }
 63 |     }
 64 | }
 65 | 
 66 | /// Action to be taken upon an `Echo` resource during reconciliation
 67 | enum EchoAction {
 68 |     /// Create the subresources, this includes spawning `n` pods with Echo service
 69 |     Create,
 70 |     /// Delete all subresources created in the `Create` phase
 71 |     Delete,
 72 |     /// This `Echo` resource is in desired state and requires no actions to be taken
 73 |     NoOp,
 74 | }
 75 | 
 76 | async fn reconcile(echo: Arc<Echo>, context: Arc<ContextData>) -> Result<Action, Error> {
 77 |     let client: Client = context.client.clone(); // The `Client` is shared -> a clone from the reference is obtained
 78 | 
 79 |     // The resource of `Echo` kind is required to have a namespace set. However, it is not guaranteed
 80 |     // the resource will have a `namespace` set. Therefore, the `namespace` field on object's metadata
 81 |     // is optional and Rust forces the programmer to check for it's existence first.
 82 |     let namespace: String = match echo.namespace() {
 83 |         None => {
 84 |             // If there is no namespace to deploy to defined, reconciliation ends with an error immediately.
 85 |             return Err(Error::UserInputError(
 86 |                 "Expected Echo resource to be namespaced. Can't deploy to an unknown namespace."
 87 |                     .to_owned(),
 88 |             ));
 89 |         }
 90 |         // If namespace is known, proceed. In a more advanced version of the operator, perhaps
 91 |         // the namespace could be checked for existence first.
 92 |         Some(namespace) => namespace,
 93 |     };
 94 |     let name = echo.name_any(); // Name of the Echo resource is used to name the subresources as well.
 95 | 
 96 |     // Performs action as decided by the `determine_action` function.
 97 |     match determine_action(&echo) {
 98 |         EchoAction::Create => {
 99 |             // Creates a deployment with `n` Echo service pods, but applies a finalizer first.
100 |             // Finalizer is applied first, as the operator might be shut down and restarted
101 |             // at any time, leaving subresources in intermediate state. This prevents leaks on
102 |             // the `Echo` resource deletion.
103 | 
104 |             // Apply the finalizer first. If that fails, the `?` operator invokes automatic conversion
105 |             // of `kube::Error` to the `Error` defined in this crate.
106 |             finalizer::add(client.clone(), &name, &namespace).await?;
107 |             // Invoke creation of a Kubernetes built-in resource named deployment with `n` echo service pods.
108 |             echo::deploy(client, &name, echo.spec.replicas, &namespace).await?;
109 |             Ok(Action::requeue(Duration::from_secs(10)))
110 |         }
111 |         EchoAction::Delete => {
112 |             // Deletes any subresources related to this `Echo` resources. If and only if all subresources
113 |             // are deleted, the finalizer is removed and Kubernetes is free to remove the `Echo` resource.
114 | 
115 |             //First, delete the deployment. If there is any error deleting the deployment, it is
116 |             // automatically converted into `Error` defined in this crate and the reconciliation is ended
117 |             // with that error.
118 |             // Note: A more advanced implementation would check for the Deployment's existence.
119 |             echo::delete(client.clone(), &name, &namespace).await?;
120 | 
121 |             // Once the deployment is successfully removed, remove the finalizer to make it possible
122 |             // for Kubernetes to delete the `Echo` resource.
123 |             finalizer::delete(client, &name, &namespace).await?;
124 |             Ok(Action::await_change()) // Makes no sense to delete after a successful delete, as the resource is gone
125 |         }
126 |         // The resource is already in desired state, do nothing and re-check after 10 seconds
127 |         EchoAction::NoOp => Ok(Action::requeue(Duration::from_secs(10))),
128 |     }
129 | }
130 | 
131 | /// Resources arrives into reconciliation queue in a certain state. This function looks at
132 | /// the state of given `Echo` resource and decides which actions needs to be performed.
133 | /// The finite set of possible actions is represented by the `EchoAction` enum.
134 | ///
135 | /// # Arguments
136 | /// - `echo`: A reference to `Echo` being reconciled to decide next action upon.
137 | fn determine_action(echo: &Echo) -> EchoAction {
138 |     if echo.meta().deletion_timestamp.is_some() {
139 |         EchoAction::Delete
140 |     } else if echo
141 |         .meta()
142 |         .finalizers
143 |         .as_ref()
144 |         .map_or(true, |finalizers| finalizers.is_empty())
145 |     {
146 |         EchoAction::Create
147 |     } else {
148 |         EchoAction::NoOp
149 |     }
150 | }
151 | 
152 | /// Actions to be taken when a reconciliation fails - for whatever reason.
153 | /// Prints out the error to `stderr` and requeues the resource for another reconciliation after
154 | /// five seconds.
155 | ///
156 | /// # Arguments
157 | /// - `echo`: The erroneous resource.
158 | /// - `error`: A reference to the `kube::Error` that occurred during reconciliation.
159 | /// - `_context`: Unused argument. Context Data "injected" automatically by kube-rs.
160 | fn on_error(echo: Arc<Echo>, error: &Error, _context: Arc<ContextData>) -> Action {
161 |     eprintln!("Reconciliation error:\n{:?}.\n{:?}", error, echo);
162 |     Action::requeue(Duration::from_secs(5))
163 | }
164 | 
165 | /// All errors possible to occur during reconciliation
166 | #[derive(Debug, thiserror::Error)]
167 | pub enum Error {
168 |     /// Any error originating from the `kube-rs` crate
169 |     #[error("Kubernetes reported error: {source}")]
170 |     KubeError {
171 |         #[from]
172 |         source: kube::Error,
173 |     },
174 |     /// Error in user input or Echo resource definition, typically missing fields.
175 |     #[error("Invalid Echo CRD: {0}")]
176 |     UserInputError(String),
177 | }
178 | 


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