Fix linter suggestions (#68)

* removed unneeded lifetimes

* removed unneccessary imports

* removed unneccessary return statements

* added derive eq -> linter suggestion

* removed unneccessary references

* made code more concise

* ok_or_else instead of ok_or improves performance -> linter suggestion

src/config.rs

@@ -1,5 +1,4 @@
 use crate::opts;
-use anyhow;
 use directories::ProjectDirs;
 use serde::Deserialize;
 use std::fs;
@@ -19,10 +18,10 @@ pub struct Entry {
 }
 
 fn default_ttl() -> u32 {
-    return 300;
+    300
 }
 
-#[derive(Deserialize, PartialEq, Debug)]
+#[derive(Deserialize, Debug, PartialEq, Eq)]
 pub enum IPSourceName {
     Ipify,
     Icanhazip,
@@ -47,7 +46,7 @@ pub struct Config {
     pub ttl: u32,
 }
 
-const DEFAULT_TYPES: &'static [&'static str] = &["A"];
+const DEFAULT_TYPES: &[&str] = &["A"];
 
 impl Config {
     pub fn fqdn<'c>(entry: &'c Entry, config: &'c Config) -> &'c str {
@@ -58,7 +57,7 @@ impl Config {
         entry.ttl.unwrap_or(config.ttl)
     }
 
-    pub fn types<'e>(entry: &'e Entry) -> Vec<&'e str> {
+    pub fn types(entry: &Entry) -> Vec<&str> {
         entry.types.iter().map(|t| t.as_str()).collect()
     }
 }
@@ -70,11 +69,11 @@ fn load_config_from<P: std::convert::AsRef<std::path::Path>>(path: P) -> anyhow:
 
 pub fn load_config(opts: &opts::Opts) -> anyhow::Result<Config> {
     let mut config = match &opts.config {
-        Some(config_path) => load_config_from(&config_path),
+        Some(config_path) => load_config_from(config_path),
         None => {
             let confpath = ProjectDirs::from("me", "kaangenc", "gandi-dynamic-dns")
-                .and_then(|dir| Some(PathBuf::from(dir.config_dir()).join("config.toml")))
-                .ok_or(anyhow::anyhow!("Can't find config directory"));
+                .map(|dir| PathBuf::from(dir.config_dir()).join("config.toml"))
+                .ok_or_else(|| anyhow::anyhow!("Can't find config directory"));
             confpath
                 .and_then(|path| {
                     println!("Checking for config: {}", path.to_string_lossy());
@@ -93,11 +92,9 @@ pub fn load_config(opts: &opts::Opts) -> anyhow::Result<Config> {
             .entry
             .into_iter()
             .map(|mut entry| {
-                entry.types = entry
+                entry
                     .types
-                    .into_iter()
-                    .filter(|v| (v == "A" && !opts.skip_ipv4) || (v == "AAAA" && !opts.skip_ipv6))
-                    .collect();
+                    .retain(|v| (v == "A" && !opts.skip_ipv4) || (v == "AAAA" && !opts.skip_ipv6));
                 entry
             })
             .collect();
@@ -107,13 +104,13 @@ pub fn load_config(opts: &opts::Opts) -> anyhow::Result<Config> {
 
 pub fn validate_config(config: &Config) -> anyhow::Result<()> {
     for entry in &config.entry {
-        for entry_type in Config::types(&entry) {
+        for entry_type in Config::types(entry) {
             if entry_type != "A" && entry_type != "AAAA" {
                 anyhow::bail!("Entry {} has invalid type {}", entry.name, entry_type);
             }
         }
     }
-    return Ok(());
+    Ok(())
 }
 
 #[cfg(test)]

src/ip_source/icanhazip.rs

@@ -1,4 +1,3 @@
-use anyhow;
 use async_trait::async_trait;
 
 use super::ip_source::IPSource;

src/ip_source/ip_source.rs

@@ -1,4 +1,3 @@
-use anyhow;
 use async_trait::async_trait;
 
 #[async_trait]

src/ip_source/ipify.rs

@@ -1,4 +1,3 @@
-use anyhow;
 use async_trait::async_trait;
 
 use super::ip_source::IPSource;

src/main.rs

@@ -1,10 +1,8 @@
 use crate::config::Config;
 use crate::gandi::GandiAPI;
 use crate::ip_source::{ip_source::IPSource, ipify::IPSourceIpify};
-use anyhow;
 use clap::Parser;
 use config::IPSourceName;
-use futures;
 use ip_source::icanhazip::IPSourceIcanhazip;
 use reqwest::{header, Client, ClientBuilder, StatusCode};
 use serde::Serialize;
@@ -16,7 +14,6 @@ mod gandi;
 mod ip_source;
 mod opts;
 use die_exit_2::*;
-use governor;
 
 /// 30 requests per minute, see https://api.gandi.net/docs/reference/
 const GANDI_RATE_LIMIT: u32 = 30;
@@ -34,7 +31,7 @@ fn api_client(api_key: &str) -> anyhow::Result<Client> {
     let accept_value = header::HeaderValue::from_static("application/json");
     headers.insert(header::ACCEPT, accept_value);
     let client = client_builder.default_headers(headers).build()?;
-    return Ok(client);
+    Ok(client)
 }
 
 #[derive(Serialize)]
@@ -72,11 +69,11 @@ async fn run<IP: IPSource>(base_url: &str, conf: &Config) -> anyhow::Result<()>
 
     for entry in &conf.entry {
         for entry_type in Config::types(entry) {
-            let fqdn = Config::fqdn(&entry, &conf).to_string();
+            let fqdn = Config::fqdn(entry, &conf).to_string();
             let url = GandiAPI {
                 fqdn: &fqdn,
                 rrset_name: &entry.name,
-                rrset_type: &entry_type,
+                rrset_type: entry_type,
                 base_url,
             }
             .url();
@@ -87,7 +84,7 @@ async fn run<IP: IPSource>(base_url: &str, conf: &Config) -> anyhow::Result<()>
             };
             let payload = APIPayload {
                 rrset_values: vec![ip.to_string()],
-                rrset_ttl: Config::ttl(&entry, &conf),
+                rrset_ttl: Config::ttl(entry, &conf),
             };
             let req = client.put(url).json(&payload);
             let task_governor = governor.clone();