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low_level.rs
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low_level.rs
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use reqwest::{self, StatusCode};
use std::path::Path;
use config::KubeConfig;
use resources::*;
use std::fs::File;
use std::io::Read;
use openssl::pkcs12::Pkcs12;
use serde::{Serialize};
use serde::de::DeserializeOwned;
use serde_json::{self, Value};
use serde_yaml;
use url::Url;
use std::borrow::Borrow;
use walkdir::WalkDir;
use errors::*;
#[derive(Clone)]
pub struct KubeLowLevel {
pub(crate) client: reqwest::Client,
pub(crate) base_url: Url,
}
// This is only used for figuring out the API endpoint to use
#[derive(Deserialize, Debug)]
#[serde(rename_all = "camelCase")]
struct MinimalResource {
api_version: String,
kind: Kind,
metadata: Metadata,
}
impl KubeLowLevel {
pub fn load_conf<P: AsRef<Path>>(path: P) -> Result<KubeLowLevel> {
let kubeconfig = KubeConfig::load(path)?;
let context = kubeconfig.default_context()?;
let auth_info = context.user;
let cluster = context.cluster;
let ca_cert = cluster.ca_cert()
.chain_err(|| "kubeconfig missing CA cert")?;
let client_cert = auth_info.client_certificate()
.chain_err(|| "kubeconfig missing client cert")?;
let client_key = auth_info.client_key().chain_err(|| "kubeconfig missing client key")?;
let pkcs_cert = Pkcs12::builder()
.build("", "admin", &client_key, &client_cert)
.chain_err(|| "Failed to build Pkcs12")?;
let req_ca_cert = reqwest::Certificate::from_der(&ca_cert.to_der().unwrap()).unwrap();
let req_pkcs_cert = reqwest::Pkcs12::from_der(&pkcs_cert.to_der().unwrap(), "").unwrap();
let client = reqwest::Client::builder()
.chain_err(|| "Failed to create reqwest client builder")?
.add_root_certificate(req_ca_cert)
.chain_err(|| "Failed to add root cert to reqwest client")?
.identity(req_pkcs_cert)
.chain_err(|| "Failed to add PKCS cert and key to reqwest client")?
.danger_disable_hostname_verification()
.build()
.chain_err(|| "Failed to build reqwest client")?;
Ok(KubeLowLevel { client, base_url: cluster.server })
}
pub fn health(&self) -> Result<String> {
let mut response = self.http_get(self.base_url.join("healthz")?)?;
let mut output = String::new();
let _ = response.read_to_string(&mut output)?;
Ok(output)
}
pub fn check<D>(&self, route: &str) -> Result<D>
where D: DeserializeOwned
{
self.http_get_json(self.base_url.join(route)?)
}
pub fn exists(&self, route: &ResourceRoute) -> Result<bool> {
let url = route.build(&self.base_url)?;
let mut response = self.client.get(url)?
.send()
.chain_err(|| "Failed to GET URL")?;
match response.status() {
StatusCode::NotFound => Ok(false),
s if s.is_success() => Ok(true),
_ => {
let status: Status = response.json()
.chain_err(|| "Failed to decode error response as 'Status'")?;
bail!(status.message);
}
}
}
pub fn list<D>(&self, route: &KindRoute) -> Result<D>
where D: DeserializeOwned {
let url = route.build(&self.base_url)?;
self.http_get_json(url)
}
pub fn get<D>(&self, route: &ResourceRoute) -> Result<D>
where D: DeserializeOwned
{
let url = route.build(&self.base_url)?;
self.http_get_json(url)
}
pub fn create<S, D>(&self, route: &KindRoute, resource: &str, data: &S) -> Result<D>
where S: Serialize,
D: DeserializeOwned
{
let body = json!({
"data": data,
"metadata": { "name": resource }
});
self.apply(route, &body)
}
pub fn apply<S, D>(&self, route: &KindRoute, body: &S) -> Result<D>
where S: Serialize,
D: DeserializeOwned
{
let url = route.build(&self.base_url)?;
self.http_post_json(url, &body)
}
pub fn apply_path<D, P: AsRef<Path>>(&self, path: P) -> Result<Vec<D>>
where D: DeserializeOwned + ::std::fmt::Debug
{
WalkDir::new(path).max_depth(1).into_iter()
.filter_map(|e| e.ok())
.filter(|entry| entry.file_type().is_file())
.filter(|entry| {
if let Some(ext) = entry.path().extension() {
let ext = ext.to_string_lossy().to_lowercase();
return ext == "json" || ext == "yaml";
}
false
})
.map(|entry| {
self.apply_file(entry.path())
.chain_err(|| format!("Failed to apply {}", entry.path().display()))
})
.collect()
}
// TODO: This function could use a serious refactoring
fn apply_file<D>(&self, path: &Path) -> Result<D>
where D: DeserializeOwned + ::std::fmt::Debug
{
let mut bytes = Vec::new();
let ext = path.extension().unwrap().to_string_lossy().to_lowercase();
let mut file = File::open(path)?;
file.read_to_end(&mut bytes)?;
let body: Value = match &*ext {
"json" => serde_json::from_slice(&bytes)?,
"yaml" => serde_yaml::from_slice(&bytes)?,
_ => unreachable!("kubeclient bug: unexpected and unfiltered file extension"),
};
let mini: MinimalResource = serde_json::from_value(body.clone())?;
let root = if mini.api_version.starts_with("v") {
"/api"
} else {
"/apis"
};
let name = mini.metadata.name.expect("must set metadata.name to apply kubernetes resource");
let kind_path = match mini.metadata.namespace.as_ref().map(|x| &**x).borrow().or(mini.kind.default_namespace) {
Some(ns) => format!("{}/{}/namespaces/{}/{}", root, mini.api_version, ns, mini.kind.plural),
None =>format!("{}/{}/{}", root, mini.api_version, mini.kind.plural),
};
let kind_url = self.base_url.join(&kind_path)?;
let resource_url = self.base_url.join(&format!("{}/{}", kind_path, name))?;
// First check if resource already exists
let mut response = self.client.get(resource_url)?.send()
.chain_err(|| "Failed to GET URL")?;
match response.status() {
// Apply if resource doesn't exist
StatusCode::NotFound => {
let resp = self.http_post_json(kind_url, &body)?;
Ok(resp)
}
// Return it if it already exists
s if s.is_success() => {
let resp = response.json().chain_err(|| "Failed to decode JSON response")?;
Ok(resp)
}
// Propogate any other error
_ => {
let status: Status = response.json()
.chain_err(|| "Failed to decode error response as 'Status'")?;
bail!(status.message);
}
}
}
fn replace_file<D>(&self, mut file: File, format: &str) -> Result<D>
where D: DeserializeOwned + ::std::fmt::Debug
{
let mut bytes = Vec::new();
file.read_to_end(&mut bytes)?;
// FIXME: don't double deserialize. use json pointers to extract fields (and improve errors when missing fields)
let (mini, body): (MinimalResource, Value) = match &*format.to_lowercase() {
"json" => (serde_json::from_slice(&bytes)?, serde_json::from_slice(&bytes)?),
"yaml" => (serde_yaml::from_slice(&bytes)?, serde_yaml::from_slice(&bytes)?),
_ => unreachable!("kubeclient bug: unexpected and unfiltered file extension"),
};
let root = if mini.api_version.starts_with("v") {
"/api"
} else {
"/apis"
};
let name = mini.metadata.name.expect("must set metadata.name to replace kubernetes resource");
let url = match mini.metadata.namespace {
Some(ns) => self.base_url.join(
&format!("{}/{}/namespaces/{}/{}/{}", root, mini.api_version, ns, mini.kind.plural, name)
)?,
None => self.base_url.join(
&format!("{}/{}/{}/{}", root, mini.api_version, mini.kind.plural, name)
)?,
};
let resp = self.http_put_json(url, &body)?;
Ok(resp)
}
pub fn delete(&self, route: &ResourceRoute) -> Result<()> {
let url = route.build(&self.base_url)?;
self.http_delete(url).map(|_| ())
}
//
// Low-level
//
pub(crate) fn http_get(&self, url: Url) -> Result<reqwest::Response> {
let mut req = self.client.get(url)?;
let mut response = req.send().chain_err(|| "Failed to GET URL")?;
if !response.status().is_success() {
let status: Status = response.json()
.chain_err(|| "Failed to decode kubernetes error response as 'Status'")?;
bail!(format!("Kubernetes API error: {}", status.message));
}
Ok(response)
}
pub(crate) fn http_get_json<D: DeserializeOwned>(&self, url: Url) -> Result<D> {
let mut response = self.http_get(url)?;
Ok(response.json().chain_err(|| "Failed to decode JSON response")?)
}
pub(crate) fn http_post_json<S, D>(&self, url: Url, body: &S) -> Result<D>
where S: Serialize,
D: DeserializeOwned,
{
let mut response = self.client.post(url)?
.json(&body).expect("JSON serialization failed")
.send()
.chain_err(|| "Failed to POST URL")?;
if !response.status().is_success() {
let status: Status = response.json()
.chain_err(|| "Failed to decode kubernetes error response as 'Status'")?;
bail!(format!("Kubernetes API error: {}", status.message));
}
Ok(response.json().chain_err(|| "Failed to decode JSON response")?)
}
pub(crate) fn http_put_json<S, D>(&self, url: Url, body: &S) -> Result<D>
where S: Serialize,
D: DeserializeOwned,
{
let mut response = self.client.put(url)?
.json(&body).expect("JSON serialization failed")
.send()
.chain_err(|| "Failed to PUT URL")?;
if !response.status().is_success() {
let status: Status = response.json()
.chain_err(|| "Failed to decode kubernetes error response as 'Status'")?;
bail!(format!("Kubernetes API error: {}", status.message));
}
Ok(response.json().chain_err(|| "Failed to decode JSON response")?)
}
pub(crate) fn http_delete(&self, url: Url) -> Result<reqwest::Response> {
let mut response = self.client.delete(url)?
.send()
.chain_err(|| "Failed to DELETE URL")?;
if !response.status().is_success() {
let status: Status = response.json()
.chain_err(|| "Failed to decode kubernetes error response as 'Status'")?;
bail!(format!("Kubernetes API error: {}", status.message));
}
Ok(response)
}
}
pub struct KindRoute<'a> {
api: &'a str,
namespace: Option<&'a str>,
kind: &'a str,
query: Option<Vec<(String, String)>>,
}
pub struct ResourceRoute<'a> {
api: &'a str,
namespace: Option<&'a str>,
kind: &'a str,
resource: &'a str,
query: Option<Vec<(String, String)>>,
}
impl<'a> KindRoute<'a> {
pub fn new(api: &'a str, kind: &'a str) -> KindRoute<'a> {
KindRoute {
api, kind,
namespace: None,
query: None,
}
}
pub fn namespace(&mut self, namespace: &'a str) -> &mut KindRoute<'a> {
self.namespace = Some(namespace);
self
}
pub fn query<I, K, V>(&mut self, query: I) -> &mut KindRoute<'a>
where
I: IntoIterator,
I::Item: Borrow<(K, V)>,
K: AsRef<str>,
V: AsRef<str>,
{
// This is ugly, but today the borrow checker beat me
let pairs = query.into_iter()
.map(|i| {
let (ref k, ref v) = *i.borrow();
(k.as_ref().to_owned(), v.as_ref().to_owned())
})
.collect();
self.query = Some(pairs);
self
}
pub fn build(&self, base_url: &Url) -> Result<Url> {
let path = match self.namespace {
Some(ns) => format!("{}/namespaces/{}/{}", self.api, ns, self.kind),
None => format!("{}/{}", self.api, self.kind),
};
let mut url = base_url.join(&path)?;
if let Some(ref query) = self.query {
url.query_pairs_mut().extend_pairs(query);
}
Ok(url)
}
}
impl<'a> ResourceRoute<'a> {
pub fn new(api: &'a str, kind: &'a str, resource: &'a str) -> ResourceRoute<'a> {
ResourceRoute {
api, kind, resource,
namespace: None,
query: None,
}
}
pub fn namespace(&mut self, namespace: &'a str) -> &mut ResourceRoute<'a> {
self.namespace = Some(namespace);
self
}
pub fn query<I, K, V>(&mut self, query: I) -> &mut ResourceRoute<'a>
where
I: IntoIterator,
I::Item: Borrow<(K, V)>,
K: AsRef<str>,
V: AsRef<str>,
{
// This is ugly, but today the borrow checker beat me
let pairs = query.into_iter()
.map(|i| {
let (ref k, ref v) = *i.borrow();
(k.as_ref().to_owned(), v.as_ref().to_owned())
})
.collect();
self.query = Some(pairs);
self
}
pub(crate) fn build(&self, base_url: &Url) -> Result<Url> {
let path = match self.namespace {
Some(ns) => format!("{}/namespaces/{}/{}/{}", self.api, ns, self.kind, self.resource),
None => format!("{}/{}/{}", self.api, self.kind, self.resource),
};
let mut url = base_url.join(&path)?;
if let Some(ref query) = self.query {
url.query_pairs_mut().extend_pairs(query);
}
Ok(url)
}
}