Don't tear down all server threads on SIGHUP

Instead we parse the new config, replace the in-memory configuration
state, stop all old threads for IPs which are no longer in the
configuration, and start any new ones for IPs which were added.

Signed-off-by: Johannes Löthberg <johannes.loethberg@elokon.com>

1 files changed, 48 insertions, 47 deletions

diff --git a/Cargo.lock b/Cargo.lock
index 258bdc3..ab03f63 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -7,9 +7,10 @@ name = "aardvark-dns"
 version = "1.11.0-dev"
 dependencies = [
  "anyhow",
- "async-broadcast",
+ "arc-swap",
  "chrono",
  "clap",
+ "flume",
  "futures-util",
  "hickory-client",
  "hickory-proto",
@@ -108,16 +109,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0952808a6c2afd1aa8947271f3a60f1a6763c7b912d210184c5149b5cf147247"
 
 [[package]]
-name = "async-broadcast"
-version = "0.7.0"
+name = "arc-swap"
+version = "1.7.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "258b52a1aa741b9f09783b2d86cf0aeeb617bbf847f6933340a39644227acbdb"
-dependencies = [
- "event-listener",
- "event-listener-strategy",
- "futures-core",
- "pin-project-lite",
-]
+checksum = "69f7f8c3906b62b754cd5326047894316021dcfe5a194c8ea52bdd94934a3457"
 
 [[package]]
 name = "async-trait"
@@ -248,27 +243,12 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "acbf1af155f9b9ef647e42cdc158db4b64a1b61f743629225fde6f3e0be2a7c7"
 
 [[package]]
-name = "concurrent-queue"
-version = "2.4.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d16048cd947b08fa32c24458a22f5dc5e835264f689f4f5653210c69fd107363"
-dependencies = [
- "crossbeam-utils",
-]
-
-[[package]]
 name = "core-foundation-sys"
 version = "0.8.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "06ea2b9bc92be3c2baa9334a323ebca2d6f074ff852cd1d7b11064035cd3868f"
 
 [[package]]
-name = "crossbeam-utils"
-version = "0.8.19"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "248e3bacc7dc6baa3b21e405ee045c3047101a49145e7e9eca583ab4c2ca5345"
-
-[[package]]
 name = "data-encoding"
 version = "2.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -311,24 +291,15 @@ dependencies = [
 ]
 
 [[package]]
-name = "event-listener"
-version = "5.2.0"
+name = "flume"
+version = "0.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2b5fb89194fa3cad959b833185b3063ba881dbfc7030680b314250779fb4cc91"
+checksum = "55ac459de2512911e4b674ce33cf20befaba382d05b62b008afc1c8b57cbf181"
 dependencies = [
- "concurrent-queue",
- "parking",
- "pin-project-lite",
-]
-
-[[package]]
-name = "event-listener-strategy"
-version = "0.5.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "feedafcaa9b749175d5ac357452a9d41ea2911da598fde46ce1fe02c37751291"
-dependencies = [
- "event-listener",
- "pin-project-lite",
+ "futures-core",
+ "futures-sink",
+ "nanorand",
+ "spin",
 ]
 
 [[package]]
@@ -393,8 +364,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "190092ea657667030ac6a35e305e62fc4dd69fd98ac98631e5d3a2b1575a12b5"
 dependencies = [
  "cfg-if",
+ "js-sys",
  "libc",
  "wasi",
+ "wasm-bindgen",
 ]
 
 [[package]]
@@ -560,6 +533,16 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9c198f91728a82281a64e1f4f9eeb25d82cb32a5de251c6bd1b5154d63a8e7bd"
 
 [[package]]
+name = "lock_api"
+version = "0.4.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3c168f8615b12bc01f9c17e2eb0cc07dcae1940121185446edc3744920e8ef45"
+dependencies = [
+ "autocfg",
+ "scopeguard",
+]
+
+[[package]]
 name = "log"
 version = "0.4.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -598,6 +581,15 @@ dependencies = [
 ]
 
 [[package]]
+name = "nanorand"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6a51313c5820b0b02bd422f4b44776fbf47961755c74ce64afc73bfad10226c3"
+dependencies = [
+ "getrandom",
+]
+
+[[package]]
 name = "nibble_vec"
 version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -668,12 +660,6 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3fdb12b2476b595f9358c5161aa467c2438859caa136dec86c26fdd2efe17b92"
 
 [[package]]
-name = "parking"
-version = "2.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bb813b8af86854136c6922af0598d719255ecb2179515e6e7730d468f05c9cae"
-
-[[package]]
 name = "percent-encoding"
 version = "2.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -783,6 +769,12 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d626bb9dae77e28219937af045c257c28bfd3f69333c512553507f5f9798cb76"
 
 [[package]]
+name = "scopeguard"
+version = "1.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "94143f37725109f92c262ed2cf5e59bce7498c01bcc1502d7b9afe439a4e9f49"
+
+[[package]]
 name = "serde"
 version = "1.0.197"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -847,6 +839,15 @@ dependencies = [
 ]
 
 [[package]]
+name = "spin"
+version = "0.9.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6980e8d7511241f8acf4aebddbb1ff938df5eebe98691418c4468d0b72a96a67"
+dependencies = [
+ "lock_api",
+]
+
+[[package]]
 name = "strsim"
 version = "0.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"