Release v2.1.1

Fix rand 0.10 compile error (RngExt trait import) and ship version
bump alongside DELETE_ON_FAILURE, proportional jitter, and dependency
refresh changes already merged on master.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Cargo.lock

@@ -79,9 +79,20 @@ version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9330f8b2ff13f34540b44e946ef35111825727b38d33286ef986142615121801"
 
+[[package]]
+name = "chacha20"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6f8d983286843e49675a4b7a2d174efe136dc93a18d69130dd18198a6c167601"
+dependencies = [
+ "cfg-if",
+ "cpufeatures",
+ "rand_core",
+]
+
 [[package]]
 name = "cloudflare-ddns"
-version = "2.1.0"
+version = "2.1.1"
 dependencies = [
  "if-addrs",
  "rand",
@@ -122,6 +133,15 @@ version = "0.8.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "773648b94d0e5d620f64f280777445740e61fe701025087ec8b57f45c791888b"
 
+[[package]]
+name = "cpufeatures"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8b2a41393f66f16b0823bb79094d54ac5fbd34ab292ddafb9a0456ac9f87d201"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "deadpool"
 version = "0.12.3"
@@ -299,18 +319,6 @@ dependencies = [
  "wasi",
 ]
 
-[[package]]
-name = "getrandom"
-version = "0.3.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "899def5c37c4fd7b2664648c28120ecec138e4d395b459e5ca34f9cce2dd77fd"
-dependencies = [
- "cfg-if",
- "libc",
- "r-efi 5.3.0",
- "wasip2",
-]
-
 [[package]]
 name = "getrandom"
 version = "0.4.2"
@@ -319,7 +327,8 @@ checksum = "0de51e6874e94e7bf76d726fc5d13ba782deca734ff60d5bb2fb2607c7406555"
 dependencies = [
  "cfg-if",
  "libc",
- "r-efi 6.0.0",
+ "r-efi",
+ "rand_core",
  "wasip2",
  "wasip3",
 ]
@@ -785,15 +794,6 @@ dependencies = [
  "zerovec",
 ]
 
-[[package]]
-name = "ppv-lite86"
-version = "0.2.21"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "85eae3c4ed2f50dcfe72643da4befc30deadb458a9b590d720cde2f2b1e97da9"
-dependencies = [
- "zerocopy",
-]
-
 [[package]]
 name = "prettyplease"
 version = "0.2.37"
@@ -822,12 +822,6 @@ dependencies = [
  "proc-macro2",
 ]
 
-[[package]]
-name = "r-efi"
-version = "5.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "69cdb34c158ceb288df11e18b4bd39de994f6657d83847bdffdbd7f346754b0f"
-
 [[package]]
 name = "r-efi"
 version = "6.0.0"
@@ -836,32 +830,20 @@ checksum = "f8dcc9c7d52a811697d2151c701e0d08956f92b0e24136cf4cf27b57a6a0d9bf"
 
 [[package]]
 name = "rand"
-version = "0.9.3"
+version = "0.10.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7ec095654a25171c2124e9e3393a930bddbffdc939556c914957a4c3e0a87166"
+checksum = "d2e8e8bcc7961af1fdac401278c6a831614941f6164ee3bf4ce61b7edb162207"
 dependencies = [
- "rand_chacha",
+ "chacha20",
- "rand_core",
+ "getrandom 0.4.2",
-]
-
-[[package]]
-name = "rand_chacha"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d3022b5f1df60f26e1ffddd6c66e8aa15de382ae63b3a0c1bfc0e4d3e3f325cb"
-dependencies = [
- "ppv-lite86",
  "rand_core",
 ]
 
 [[package]]
 name = "rand_core"
-version = "0.9.5"
+version = "0.10.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "76afc826de14238e6e8c374ddcc1fa19e374fd8dd986b0d2af0d02377261d83c"
+checksum = "63b8176103e19a2643978565ca18b50549f6101881c443590420e4dc998a3c69"
-dependencies = [
- "getrandom 0.3.4",
-]
 
 [[package]]
 name = "regex"
@@ -900,9 +882,9 @@ checksum = "dc897dd8d9e8bd1ed8cdad82b5966c3e0ecae09fb1907d58efaa013543185d0a"
 
 [[package]]
 name = "reqwest"
-version = "0.13.2"
+version = "0.13.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ab3f43e3283ab1488b624b44b0e988d0acea0b3214e694730a055cb6b2efa801"
+checksum = "62e0021ea2c22aed41653bc7e1419abb2c97e038ff2c33d0e1309e49a97deec0"
 dependencies = [
  "base64",
  "bytes",
@@ -964,9 +946,9 @@ dependencies = [
 
 [[package]]
 name = "rustls"
-version = "0.23.39"
+version = "0.23.40"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7c2c118cb077cca2822033836dfb1b975355dfb784b5e8da48f7b6c5db74e60e"
+checksum = "ef86cd5876211988985292b91c96a8f2d298df24e75989a43a3c73f2d4d8168b"
 dependencies = [
  "once_cell",
  "ring",
@@ -1887,26 +1869,6 @@ dependencies = [
  "synstructure",
 ]
 
-[[package]]
-name = "zerocopy"
-version = "0.8.48"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "eed437bf9d6692032087e337407a86f04cd8d6a16a37199ed57949d415bd68e9"
-dependencies = [
- "zerocopy-derive",
-]
-
-[[package]]
-name = "zerocopy-derive"
-version = "0.8.48"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "70e3cd084b1788766f53af483dd21f93881ff30d7320490ec3ef7526d203bad4"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn",
-]
-
 [[package]]
 name = "zerofrom"
 version = "0.1.6"

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "cloudflare-ddns"
-version = "2.1.0"
+version = "2.1.1"
 edition = "2021"
 description = "Access your home network remotely via a custom domain name without a static IP"
 license = "GPL-3.0"
@@ -14,7 +14,7 @@ tokio = { version = "1", features = ["rt", "macros", "time", "signal", "net"] }
 regex-lite = "0.1"
 url = "2"
 if-addrs = "0.15"
-rand = "0.9"
+rand = "0.10"
 
 [profile.release]
 opt-level = "z"

README.md

@@ -107,6 +107,7 @@ To disable this protection, set `REJECT_CLOUDFLARE_IPS=false`.
 | `UPDATE_CRON` | `@every 5m` | Update schedule |
 | `UPDATE_ON_START` | `true` | Run an update immediately on startup |
 | `DELETE_ON_STOP` | `false` | Delete managed DNS records on shutdown |
+| `DELETE_ON_FAILURE` | `true` | Delete managed DNS records when failed to obtain IP from provider |
 
 Schedule formats:
 
@@ -213,6 +214,7 @@ Heartbeats are sent after each update cycle. On failure, a fail signal is sent.
 | `UPDATE_CRON` | `@every 5m` | ⏱️ Update schedule |
 | `UPDATE_ON_START` | `true` | 🚀 Update on startup |
 | `DELETE_ON_STOP` | `false` | 🧹 Delete records on shutdown |
+| `DELETE_ON_FAILURE` | `true` | 🧹 Delete records if failed to obtain new records |
 | `TTL` | `1` | ⏳ DNS record TTL |
 | `PROXIED` | `false` | ☁️ Proxied expression |
 | `RECORD_COMMENT` | — | 💬 DNS record comment |

RELEASE_NOTES_2.1.1.md

@@ -0,0 +1,49 @@
+# cloudflare-ddns v2.1.1
+
+Maintenance release. Bug fix for `rand` 0.10 API change, plus opt-in failure-safe deletion behavior contributed in the v2.1.0 → v2.1.1 window, dependency refresh, and proportional jitter for IP detection.
+
+## Highlights
+
+- **Fix:** Restore the build under `rand` 0.10 — `random_range` moved to the `RngExt` trait, and the unconditional jitter sleep in `--repeat` mode no longer fails to compile.
+- **New:** `DELETE_ON_FAILURE` (env-var mode) controls whether DNS records are removed when an IP detection or update fails. Defaults to `true` to preserve existing behavior; set `DELETE_ON_FAILURE=false` to keep stale records on transient failures instead of yanking them.
+- **Improvement:** Proportional jitter (up to 20% of the update interval) is added before each scheduled update to spread requests across clients and reduce synchronized spikes against the Cloudflare API.
+
+## Changes since v2.1.0
+
+### Features
+- `DELETE_ON_FAILURE` env var to prevent DNS record deletion on failed updates (#263, thanks @DMaxter)
+- Proportional jitter on update intervals to desynchronize API traffic (#253, thanks @jhutchings1)
+
+### Fixes
+- Compile fix for `rand` 0.10: import `RngExt` so `random_range` resolves
+- `delete_on_failure` regression test coverage added
+
+### Dependencies
+- `rustls` 0.23.37 → 0.23.40
+- `rustls-webpki` 0.103.10 → 0.103.13
+- `tokio` 1.50.0 → 1.52.1
+- `reqwest` 0.13.2 → 0.13.3
+- `rand` 0.9.2 → 0.10.1
+
+### Docs
+- Document `DELETE_ON_FAILURE` in the README
+
+## Upgrade notes
+
+- **Default behavior unchanged.** `DELETE_ON_FAILURE` defaults to `true`, matching pre-2.1.1 behavior. Set it to `false` if you want stale records preserved during outages.
+- No config file schema changes. Existing `config.json` deployments continue to work without edits.
+
+## Docker
+
+```sh
+docker pull timothyjmiller/cloudflare-ddns:2.1.1
+docker pull timothyjmiller/cloudflare-ddns:latest
+```
+
+Multi-arch: `linux/amd64`, `linux/arm64`, `linux/ppc64le`.
+
+## Verification
+
+- `cargo test` — 352 tests pass
+- Release build succeeds, binary size ~1.7 MiB (pre-UPX)
+- Smoke tested in both legacy `config.json` mode and env-var mode against the live Cloudflare API

src/config.rs

@@ -84,6 +84,7 @@ pub struct AppConfig {
     pub update_cron: CronSchedule,
     pub update_on_start: bool,
     pub delete_on_stop: bool,
+    pub delete_on_failure: bool,
     pub ttl: TTL,
     pub proxied_expression: Option<Box<dyn Fn(&str) -> bool + Send + Sync>>,
     pub record_comment: Option<String>,
@@ -449,6 +450,7 @@ fn legacy_to_app_config(legacy: LegacyConfig, dry_run: bool, repeat: bool) -> Re
         update_cron: schedule,
         update_on_start: true,
         delete_on_stop: false,
+        delete_on_failure: true,
         ttl,
         proxied_expression: None,
         record_comment: None,
@@ -503,6 +505,7 @@ pub fn load_env_config(ppfmt: &PP) -> Result<AppConfig, String> {
     let update_cron = read_cron_from_env(ppfmt)?;
     let update_on_start = getenv_bool("UPDATE_ON_START", true);
     let delete_on_stop = getenv_bool("DELETE_ON_STOP", false);
+    let delete_on_failure = getenv_bool("DELETE_ON_FAILURE", true);
 
     let ttl_val = getenv("TTL")
         .and_then(|s| s.parse::<i64>().ok())
@@ -571,6 +574,7 @@ pub fn load_env_config(ppfmt: &PP) -> Result<AppConfig, String> {
         update_cron,
         update_on_start,
         delete_on_stop,
+        delete_on_failure,
         ttl,
         proxied_expression,
         record_comment,
@@ -1317,6 +1321,7 @@ mod tests {
             update_cron: CronSchedule::Once,
             update_on_start: true,
             delete_on_stop: false,
+            delete_on_failure: true,
             ttl: TTL::AUTO,
             proxied_expression: None,
             record_comment: None,
@@ -1351,6 +1356,7 @@ mod tests {
             update_cron: CronSchedule::Every(Duration::from_secs(300)),
             update_on_start: true,
             delete_on_stop: true,
+            delete_on_failure: true,
             ttl: TTL::new(60),
             proxied_expression: None,
             record_comment: Some("managed".to_string()),
@@ -2003,6 +2009,7 @@ mod tests {
             update_cron: CronSchedule::Every(Duration::from_secs(300)),
             update_on_start: true,
             delete_on_stop: false,
+            delete_on_failure: true,
             ttl: TTL::AUTO,
             proxied_expression: None,
             record_comment: None,
@@ -2039,6 +2046,7 @@ mod tests {
             update_cron: CronSchedule::Every(Duration::from_secs(600)),
             update_on_start: true,
             delete_on_stop: true,
+            delete_on_failure: true,
             ttl: TTL::new(120),
             proxied_expression: None,
             record_comment: Some("cf-ddns".to_string()),
@@ -2072,6 +2080,7 @@ mod tests {
             update_cron: CronSchedule::Once,
             update_on_start: true,
             delete_on_stop: false,
+            delete_on_failure: true,
             ttl: TTL::AUTO,
             proxied_expression: None,
             record_comment: None,

src/main.rs

@@ -14,7 +14,7 @@ use crate::pp::PP;
 use std::collections::HashSet;
 use std::sync::atomic::{AtomicBool, Ordering};
 use std::sync::Arc;
-use rand::Rng;
+use rand::RngExt;
 use reqwest::Client;
 use tokio::signal;
 use tokio::time::{sleep, Duration};

src/updater.rs

@@ -115,6 +115,19 @@ pub async fn update_once(
         // Update DNS records (env var mode - domain-based)
         for (ip_type, domains) in &config.domains {
             let ips = detected_ips.get(ip_type).cloned().unwrap_or_default();
+
+            if ips.is_empty() && !config.delete_on_failure {
+                ppfmt.warningf(
+                    pp::EMOJI_WARNING,
+                    &format!(
+                        "Skipping {} domain update for {}",
+                        ip_type.describe(),
+                        domains.join(", ")
+                    ),
+                );
+                continue;
+            }
+
             let record_type = ip_type.record_type();
 
             for domain_str in domains {
@@ -713,6 +726,7 @@ mod tests {
             update_cron: CronSchedule::Once,
             update_on_start: true,
             delete_on_stop: false,
+            delete_on_failure: true,
             ttl: TTL::AUTO,
             proxied_expression: None,
             record_comment: None,
@@ -2307,6 +2321,272 @@ mod tests {
         ddns.delete_entries("A", &config).await;
     }
 
+    // -------------------------------------------------------
+    // delete_on_failure tests
+    // -------------------------------------------------------
+
+    /// When IPv4 detection fails but IPv6 succeeds, and delete_on_failure=false, skip V4 domains but update V6
+    #[tokio::test]
+    async fn test_skip_v4_domains_when_v4_detection_fails() {
+        let server = MockServer::start().await;
+        let zone_id = "zone-abc";
+        let ip_v6 = "2001:db8::1";
+
+        // Zone lookup for V6 domain
+        Mock::given(method("GET"))
+            .and(path("/zones"))
+            .and(query_param("name", "v6.example.com"))
+            .respond_with(
+                ResponseTemplate::new(200).set_body_json(zones_response(zone_id, "example.com")),
+            )
+            .mount(&server)
+            .await;
+
+        // LIST existing records for V6
+        Mock::given(method("GET"))
+            .and(path_regex(format!("/zones/{zone_id}/dns_records")))
+            .respond_with(ResponseTemplate::new(200).set_body_json(dns_records_empty()))
+            .mount(&server)
+            .await;
+
+        // POST for V6 should be called (V6 succeeds)
+        Mock::given(method("POST"))
+            .and(path(format!("/zones/{zone_id}/dns_records")))
+            .respond_with(ResponseTemplate::new(200).set_body_json(dns_record_created(
+                "rec-1",
+                "v6.example.com",
+                "2001:db8::1",
+            )))
+            .expect(1)
+            .mount(&server)
+            .await;
+
+        // Providers: V4 fails (None), V6 succeeds
+        let mut providers = HashMap::new();
+        providers.insert(IpType::V4, ProviderType::None);
+        providers.insert(
+            IpType::V6,
+            ProviderType::Literal {
+                ips: vec![ip_v6.parse().unwrap()],
+            },
+        );
+
+        let mut domains = HashMap::new();
+        domains.insert(IpType::V4, vec!["v4.example.com".to_string()]);
+        domains.insert(IpType::V6, vec!["v6.example.com".to_string()]);
+
+        let mut config = make_config(providers, domains, vec![], false);
+        config.delete_on_failure = false;
+
+        let cf = handle(&server.uri());
+        let notifier = empty_notifier();
+        let heartbeat = empty_heartbeat();
+        let ppfmt = pp();
+
+        let mut cf_cache = CachedCloudflareFilter::new();
+        let ok = update_once(
+            &config,
+            &cf,
+            &notifier,
+            &heartbeat,
+            &mut cf_cache,
+            &ppfmt,
+            &mut HashSet::new(),
+            &crate::test_client(),
+        )
+        .await;
+        assert!(ok, "Should succeed with partial detection");
+    }
+
+    /// When IPv6 detection fails but IPv4 succeeds, and delete_on_failure=false, skip V6 domains but update V4
+    #[tokio::test]
+    async fn test_skip_v6_domains_when_v6_detection_fails() {
+        let server = MockServer::start().await;
+        let zone_id = "zone-abc";
+        let ip_v4 = "198.51.100.42";
+
+        // Zone lookup for V4 domain
+        Mock::given(method("GET"))
+            .and(path("/zones"))
+            .and(query_param("name", "v4.example.com"))
+            .respond_with(
+                ResponseTemplate::new(200).set_body_json(zones_response(zone_id, "example.com")),
+            )
+            .mount(&server)
+            .await;
+
+        // LIST existing records for V4
+        Mock::given(method("GET"))
+            .and(path_regex(format!("/zones/{zone_id}/dns_records")))
+            .respond_with(ResponseTemplate::new(200).set_body_json(dns_records_empty()))
+            .mount(&server)
+            .await;
+
+        // POST for V4 should be called (V4 succeeds)
+        Mock::given(method("POST"))
+            .and(path(format!("/zones/{zone_id}/dns_records")))
+            .respond_with(ResponseTemplate::new(200).set_body_json(dns_record_created(
+                "rec-1",
+                "v4.example.com",
+                "198.51.100.42",
+            )))
+            .expect(1)
+            .mount(&server)
+            .await;
+
+        // Providers: V4 succeeds, V6 fails (None)
+        let mut providers = HashMap::new();
+        providers.insert(
+            IpType::V4,
+            ProviderType::Literal {
+                ips: vec![ip_v4.parse().unwrap()],
+            },
+        );
+        providers.insert(IpType::V6, ProviderType::None);
+
+        let mut domains = HashMap::new();
+        domains.insert(IpType::V4, vec!["v4.example.com".to_string()]);
+        domains.insert(IpType::V6, vec!["v6.example.com".to_string()]);
+
+        let mut config = make_config(providers, domains, vec![], false);
+        config.delete_on_failure = false;
+
+        let cf = handle(&server.uri());
+        let notifier = empty_notifier();
+        let heartbeat = empty_heartbeat();
+        let ppfmt = pp();
+
+        let mut cf_cache = CachedCloudflareFilter::new();
+        let ok = update_once(
+            &config,
+            &cf,
+            &notifier,
+            &heartbeat,
+            &mut cf_cache,
+            &ppfmt,
+            &mut HashSet::new(),
+            &crate::test_client(),
+        )
+        .await;
+        assert!(ok, "Should succeed with partial detection");
+    }
+
+    /// When both IPv4 and IPv6 detection fail, and delete_on_failure=false, skip all domains
+    #[tokio::test]
+    async fn test_skip_all_domains_when_both_detect_fail() {
+        let server = MockServer::start().await;
+
+        // No POST/DELETE should be called at all
+
+        // Providers: both fail (None)
+        let mut providers = HashMap::new();
+        providers.insert(IpType::V4, ProviderType::None);
+        providers.insert(IpType::V6, ProviderType::None);
+
+        let mut domains = HashMap::new();
+        domains.insert(IpType::V4, vec!["v4.example.com".to_string()]);
+        domains.insert(IpType::V6, vec!["v6.example.com".to_string()]);
+
+        let mut config = make_config(providers, domains, vec![], false);
+        config.delete_on_failure = false;
+
+        let cf = handle(&server.uri());
+        let notifier = empty_notifier();
+        let heartbeat = empty_heartbeat();
+        let ppfmt = pp();
+
+        let mut cf_cache = CachedCloudflareFilter::new();
+        let ok = update_once(
+            &config,
+            &cf,
+            &notifier,
+            &heartbeat,
+            &mut cf_cache,
+            &ppfmt,
+            &mut HashSet::new(),
+            &crate::test_client(),
+        )
+        .await;
+        assert!(ok, "Should succeed (no updates, no failures)");
+    }
+
+    /// When both IPv4 and IPv6 detection succeed, and delete_on_failure=false, update all domains
+    #[tokio::test]
+    async fn test_update_all_domains_when_both_detect() {
+        let server = MockServer::start().await;
+        let zone_id = "zone-abc";
+        let ip_v4 = "198.51.100.42";
+        let ip_v6 = "2001:db8::1";
+
+        // Zone lookups for both domains
+        Mock::given(method("GET"))
+            .and(path("/zones"))
+            .respond_with(
+                ResponseTemplate::new(200).set_body_json(zones_response(zone_id, "example.com")),
+            )
+            .mount(&server)
+            .await;
+
+        // LIST existing records (empty for both)
+        Mock::given(method("GET"))
+            .and(path_regex(format!("/zones/{zone_id}/dns_records")))
+            .respond_with(ResponseTemplate::new(200).set_body_json(dns_records_empty()))
+            .mount(&server)
+            .await;
+
+        // POST for both should be called
+        Mock::given(method("POST"))
+            .and(path(format!("/zones/{zone_id}/dns_records")))
+            .respond_with(ResponseTemplate::new(200).set_body_json(dns_record_created(
+                "rec-new",
+                "example.com",
+                "198.51.100.42",
+            )))
+            .expect(2) // Two POSTs: one for V4, one for V6
+            .mount(&server)
+            .await;
+
+        // Providers: both succeed
+        let mut providers = HashMap::new();
+        providers.insert(
+            IpType::V4,
+            ProviderType::Literal {
+                ips: vec![ip_v4.parse().unwrap()],
+            },
+        );
+        providers.insert(
+            IpType::V6,
+            ProviderType::Literal {
+                ips: vec![ip_v6.parse().unwrap()],
+            },
+        );
+
+        let mut domains = HashMap::new();
+        domains.insert(IpType::V4, vec!["v4.example.com".to_string()]);
+        domains.insert(IpType::V6, vec!["v6.example.com".to_string()]);
+
+        let mut config = make_config(providers, domains, vec![], false);
+        config.delete_on_failure = false;
+
+        let cf = handle(&server.uri());
+        let notifier = empty_notifier();
+        let heartbeat = empty_heartbeat();
+        let ppfmt = pp();
+
+        let mut cf_cache = CachedCloudflareFilter::new();
+        let ok = update_once(
+            &config,
+            &cf,
+            &notifier,
+            &heartbeat,
+            &mut cf_cache,
+            &ppfmt,
+            &mut HashSet::new(),
+            &crate::test_client(),
+        )
+        .await;
+        assert!(ok, "Should succeed with both detections");
+    }
 }
 
 // Legacy types for backwards compatibility