feat(dev): decouple syslog source and codec features (vectordotdev#18381)

This commit adds a new `codecs-syslog` feature to Vector mapped to the `codecs/syslog` package feature.

This allows for code requiring the `syslog` codec to not depend on the `syslog` source anymore and instead
depend on the `syslog` codec directly. For example, it is now possible to compile any source with `syslog`
codec support using `codecs-syslog` without having to compile the `syslog` source with it.

Signed-off-by: Hugo Hromic <[email protected]>

Author: hhromic

Cargo.toml

@@ -476,6 +476,9 @@ gcp = ["dep:base64", "dep:goauth", "dep:smpl_jwt"]
 enrichment-tables = ["enrichment-tables-geoip"]
 enrichment-tables-geoip = ["dep:maxminddb"]
 
+# Codecs
+codecs-syslog = ["codecs/syslog"]
+
 # Sources
 sources = ["sources-logs", "sources-metrics"]
 sources-logs = [
@@ -559,7 +562,7 @@ sources-socket = ["sources-utils-net", "tokio-util/net"]
 sources-splunk_hec = ["dep:roaring"]
 sources-statsd = ["sources-utils-net", "tokio-util/net"]
 sources-stdin = ["tokio-util/io"]
-sources-syslog = ["codecs/syslog", "sources-utils-net", "tokio-util/net"]
+sources-syslog = ["codecs-syslog", "sources-utils-net", "tokio-util/net"]
 sources-utils-http = ["dep:snap", "sources-utils-http-auth", "sources-utils-http-encoding", "sources-utils-http-error", "sources-utils-http-prelude"]
 sources-utils-http-auth = ["sources-utils-http-error"]
 sources-utils-http-encoding = ["dep:snap", "sources-utils-http-error"]

src/components/validation/resources/mod.rs

@@ -146,7 +146,7 @@ fn deserializer_config_to_serializer(config: &DeserializerConfig) -> encoding::S
         // TODO: We need to create an Avro serializer because, certainly, for any source decoding
         // the data as Avro, we can't possibly send anything else without the source just
         // immediately barfing.
-        #[cfg(feature = "sources-syslog")]
+        #[cfg(feature = "codecs-syslog")]
         DeserializerConfig::Syslog { .. } => SerializerConfig::Logfmt,
         DeserializerConfig::Native => SerializerConfig::Native,
         DeserializerConfig::NativeJson { .. } => SerializerConfig::NativeJson,

src/sources/datadog_agent/tests.rs

@@ -1658,7 +1658,7 @@ fn test_config_outputs() {
                 ]),
             },
         ),
-        #[cfg(feature = "sources-syslog")]
+        #[cfg(feature = "codecs-syslog")]
         (
             "syslog / single output",
             TestCase {
@@ -1733,7 +1733,7 @@ fn test_config_outputs() {
                 )]),
             },
         ),
-        #[cfg(feature = "sources-syslog")]
+        #[cfg(feature = "codecs-syslog")]
         (
             "syslog / multiple output",
             TestCase {