110 lines
2.7 KiB
Rust
110 lines
2.7 KiB
Rust
use std::fmt::{Debug, Display, Write};
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use anyhow::{bail, Result};
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use log::*;
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use reqwest::Response;
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use serde::Deserialize;
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use crate::Consul;
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impl Consul {
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pub(crate) async fn get_with_index<T: for<'de> Deserialize<'de>>(
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&self,
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mut url: String,
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last_index: Option<usize>,
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) -> Result<WithIndex<T>> {
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if let Some(i) = last_index {
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if url.contains('?') {
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write!(&mut url, "&index={}", i).unwrap();
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} else {
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write!(&mut url, "?index={}", i).unwrap();
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}
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}
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debug!("GET {} as {}", url, std::any::type_name::<T>());
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let http = self.client.get(&url).send().await?;
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Ok(WithIndex::<T>::index_from(&http)?.value(http.json().await?))
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}
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}
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/// Wraps the returned value of an [API call with blocking
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/// possibility](https://developer.hashicorp.com/consul/api-docs/features/blocking) with the
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/// returned Consul index
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pub struct WithIndex<T> {
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pub(crate) value: T,
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pub(crate) index: usize,
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}
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impl<T> WithIndex<T> {
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/// (for internal use, mostly)
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pub fn index_from(resp: &Response) -> Result<WithIndexBuilder<T>> {
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let index = match resp.headers().get("X-Consul-Index") {
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Some(v) => v.to_str()?.parse::<usize>()?,
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None => bail!("X-Consul-Index header not found"),
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};
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Ok(WithIndexBuilder {
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index,
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_phantom: Default::default(),
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})
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}
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/// Returns the inner value, discarding the index
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pub fn into_inner(self) -> T {
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self.value
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}
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/// Returns the Consul index, to be used in future calls to the same API endpoint to make them
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/// blocking
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pub fn index(&self) -> usize {
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self.index
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}
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}
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impl<T> std::convert::AsRef<T> for WithIndex<T> {
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fn as_ref(&self) -> &T {
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&self.value
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}
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}
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impl<T> std::borrow::Borrow<T> for WithIndex<T> {
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fn borrow(&self) -> &T {
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&self.value
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}
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}
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impl<T> std::ops::Deref for WithIndex<T> {
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type Target = T;
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fn deref(&self) -> &T {
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&self.value
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}
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}
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impl<T: Debug> Debug for WithIndex<T> {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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<T as Debug>::fmt(self, f)
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}
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}
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impl<T: Display> Display for WithIndex<T> {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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<T as Display>::fmt(self, f)
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}
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}
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/// (for internal use, mostly)
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pub struct WithIndexBuilder<T> {
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_phantom: std::marker::PhantomData<T>,
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index: usize,
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}
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impl<T> WithIndexBuilder<T> {
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/// (for internal use, mostly)
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pub fn value(self, value: T) -> WithIndex<T> {
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WithIndex {
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value,
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index: self.index,
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}
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}
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}
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