Add kubernetes logs source implementation

Signed-off-by: MOZGIII <mike-n@narod.ru>

distribution/kubernetes/vector-namespaced.yaml

@@ -11,8 +11,8 @@ data:
     data_dir = "/vector-data-dir"
 
     # Ingest logs from Kubernetes.
-    [sources.kubernetes]
-        type = "kubernetes"
+    [sources.kubernetes_logs]
+        type = "kubernetes_logs"
 ---
 apiVersion: apps/v1
 kind: DaemonSet
@@ -28,11 +28,11 @@ spec:
     metadata:
       labels:
         name: vector
+        vector.dev/exclude: "true"
     spec:
       containers:
         - name: vector
           image: timberio/vector:latest-alpine
-          imagePullPolicy: Always
           args:
             - --config
             - /etc/vector/*.toml

src/internal_events/kubernetes_logs.rs

@@ -0,0 +1,31 @@
+use super::InternalEvent;
+use metrics::counter;
+
+#[derive(Debug)]
+pub struct KubernetesLogsEventReceived<'a> {
+    pub file: &'a str,
+    pub byte_size: usize,
+}
+
+impl InternalEvent for KubernetesLogsEventReceived<'_> {
+    fn emit_logs(&self) {
+        trace!(
+            message = "received one event.",
+            %self.file,
+            rate_limit_secs = 10
+        );
+    }
+
+    fn emit_metrics(&self) {
+        counter!(
+            "events_processed", 1,
+            "component_kind" => "source",
+            "component_type" => "kubernetes_logs",
+        );
+        counter!(
+            "bytes_processed", self.byte_size as u64,
+            "component_kind" => "source",
+            "component_type" => "kubernetes_logs",
+        );
+    }
+}

src/internal_events/mod.rs

@@ -4,6 +4,8 @@ mod blackhole;
 mod elasticsearch;
 mod file;
 mod json;
+#[cfg(feature = "sources-kubernetes-logs")]
+mod kubernetes_logs;
 #[cfg(feature = "transforms-lua")]
 mod lua;
 #[cfg(feature = "sources-prometheus")]
@@ -22,6 +24,8 @@ pub use self::blackhole::*;
 pub use self::elasticsearch::*;
 pub use self::file::*;
 pub use self::json::*;
+#[cfg(feature = "sources-kubernetes-logs")]
+pub use self::kubernetes_logs::*;
 #[cfg(feature = "transforms-lua")]
 pub use self::lua::*;
 #[cfg(feature = "sources-prometheus")]

src/sources/kubernetes_logs/mod.rs

@@ -10,4 +10,236 @@ mod partial_events_merger;
 mod path_helpers;
 mod pod_metadata_annotator;
 
+use crate::event::{self, Event};
+use crate::internal_events::KubernetesLogsEventReceived;
+use crate::kubernetes as k8s;
+use crate::{
+    dns::Resolver,
+    shutdown::ShutdownSignal,
+    sources,
+    topology::config::{DataType, GlobalOptions, SourceConfig, SourceDescription},
+    transforms::Transform,
+};
+use evmap10::{self as evmap};
+use file_source::{FileServer, FileServerShutdown, Fingerprinter};
+use futures::{future::FutureExt, sink::Sink, stream::StreamExt};
+use futures01::sync::mpsc;
+use k8s_paths_provider::K8sPathsProvider;
+use pod_metadata_annotator::PodMetadataAnnotator;
+use serde::{Deserialize, Serialize};
+use std::path::PathBuf;
+use std::time::Duration;
+use tokio::task::spawn_blocking;
+
+/// Configuration for the `kubernetes_logs` source.
+#[derive(Deserialize, Serialize, Debug, Clone, Default)]
+#[serde(deny_unknown_fields, default)]
+pub struct Config {
+    self_node_name: String,
+}
+
+inventory::submit! {
+    SourceDescription::new_without_default::<Config>(COMPONENT_NAME)
+}
+
+const COMPONENT_NAME: &str = "kubernetes_logs";
+
+#[typetag::serde(name = "kubernetes_logs")]
+impl SourceConfig for Config {
+    fn build(
+        &self,
+        name: &str,
+        globals: &GlobalOptions,
+        shutdown: ShutdownSignal,
+        out: mpsc::Sender<Event>,
+    ) -> crate::Result<sources::Source> {
+        // TODO: switch to the ones provided by the topology once PRs for that
+        // pass.
+        let rt = crate::runtime::Runtime::new()?;
+        let exec = rt.executor();
+        let resolver = Resolver::new(globals.dns_servers.clone(), exec)?;
+
+        let source = Source::init(self, resolver, globals, name)?;
+
+        // TODO: this is a workaround for the legacy futures 0.1.
+        // When the core is updated to futures 0.3 this should be simplied
+        // significantly.
+        let out = futures::compat::Compat01As03Sink::new(out);
+        let fut = source.run(out, shutdown);
+        let fut = fut.map(|result| {
+            result.map_err(|error| {
+                error!(message = "source future failed", ?error);
+            })
+        });
+        let fut = Box::pin(fut);
+        let fut = futures::compat::Compat::new(fut);
+        let fut: sources::Source = Box::new(fut);
+        Ok(fut)
+    }
+
+    fn output_type(&self) -> DataType {
+        DataType::Log
+    }
+
+    fn source_type(&self) -> &'static str {
+        COMPONENT_NAME
+    }
+}
+
+#[derive(Clone)]
+struct Source {
+    client: k8s::client::Client,
+    self_node_name: String,
+    data_dir: PathBuf,
+}
+
+impl Source {
+    fn init(
+        config: &Config,
+        resolver: Resolver,
+        globals: &GlobalOptions,
+        name: &str,
+    ) -> crate::Result<Self> {
+        let self_node_name = if config.self_node_name.is_empty() {
+            std::env::var("VECTOR_SELF_NODE_NAME")
+                .map_err(|_| "VECTOR_SELF_NODE_NAME is not set")?
+        } else {
+            config.self_node_name.clone()
+        };
+        info!(
+            message = "obtained Kubernetes Node name to collect logs for (self)",
+            ?self_node_name
+        );
+
+        let k8s_config = k8s::client::config::Config::in_cluster()?;
+        let client = k8s::client::Client::new(k8s_config, resolver)?;
+
+        let data_dir = globals.resolve_and_make_data_subdir(None, name)?;
+
+        Ok(Self {
+            client,
+            self_node_name,
+            data_dir,
+        })
+    }
+
+    async fn run<O>(self, out: O, shutdown: ShutdownSignal) -> crate::Result<()>
+    where
+        O: Sink<Event> + Send,
+    {
+        let Self {
+            client,
+            self_node_name,
+            data_dir,
+        } = self;
+
+        let field_selector = format!("spec.nodeName={}", self_node_name);
+        let label_selector = "vector.dev/exclude!=true".to_owned();
+
+        let watcher = k8s::api_watcher::ApiWatcher::new(client);
+        let (state_reader, state_writer) = evmap::new();
+
+        let mut reflector = k8s::reflector::Reflector::new(
+            watcher,
+            state_writer,
+            Some(field_selector),
+            Some(label_selector),
+            std::time::Duration::from_secs(1),
+        );
+        let reflector_process = reflector.run();
+
+        let paths_provider = K8sPathsProvider::new(state_reader.clone());
+        let annotator = PodMetadataAnnotator::new(state_reader);
+
+        // TODO: maybe some of the parameters have to be configurable.
+        let file_server = FileServer {
+            paths_provider,
+            max_read_bytes: 2048,
+            start_at_beginning: true,
+            ignore_before: None,
+            max_line_bytes: 32 * 1024, // 32 KiB
+            data_dir,
+            glob_minimum_cooldown: Duration::from_secs(10),
+            fingerprinter: Fingerprinter::Checksum {
+                fingerprint_bytes: 256,
+                ignored_header_bytes: 0,
+            },
+            oldest_first: false,
+        };
+
+        let (file_source_tx, file_source_rx) = futures::channel::mpsc::channel(100);
+
+        let span = info_span!("file_server");
+        let file_server_join_handle = spawn_blocking(move || {
+            let _enter = span.enter();
+            let result =
+                file_server.run(file_source_tx, futures::compat::Compat01As03::new(shutdown));
+            result.unwrap()
+        });
+
+        let mut parser = parser::build();
+        let mut partial_events_merger = partial_events_merger::build(true);
+
+        let events = file_source_rx.map(|(bytes, file)| {
+            emit!(KubernetesLogsEventReceived {
+                file: &file,
+                byte_size: bytes.len(),
+            });
+            create_event(bytes, file)
+        });
+        let events = events
+            .filter_map(move |event| futures::future::ready(parser.transform(event)))
+            .filter_map(move |event| futures::future::ready(partial_events_merger.transform(event)))
+            .map(move |mut event| {
+                if annotator.annotate(&mut event).is_none() {
+                    warn!(
+                        message = "failed to annotate event with pod metadata",
+                        ?event
+                    );
+                }
+                event
+            });
+
+        let event_processing_loop = events.map(Ok).forward(out);
+
+        use std::future::Future;
+        use std::pin::Pin;
+        let list: Vec<Pin<Box<dyn Future<Output = ()> + Send>>> = vec![
+            Box::pin(reflector_process.map(|_| todo!())),
+            Box::pin(file_server_join_handle.map(|result| match result {
+                Ok(FileServerShutdown) => info!(message = "file server completed gracefully"),
+                Err(error) => error!(message = "file server exited with an error", ?error),
+            })),
+            Box::pin(event_processing_loop.map(|result| {
+                match result {
+                    Ok(_) => info!(message = "event_processing_loop ok"),
+                    Err(_) => error!(message = "event_processing_loop err"),
+                };
+            })),
+        ];
+        let mut futs: futures::stream::FuturesUnordered<_> = list.into_iter().collect();
+
+        while let Some(()) = futs.next().await {
+            trace!("another future complete");
+        }
+
+        info!("Done");
+        Ok(())
+    }
+}
+
 const FILE_KEY: &str = "file";
+
+fn create_event(line: bytes::Bytes, file: String) -> Event {
+    let mut event = Event::from(line);
+
+    // Add source type.
+    event
+        .as_mut_log()
+        .insert(event::log_schema().source_type_key(), COMPONENT_NAME);
+
+    // Add file.
+    event.as_mut_log().insert(FILE_KEY, file);
+
+    event
+}