Add logging.

Cargo.toml

@@ -62,6 +62,10 @@ tokio-stream = { version = "0.1.8", features = ["net"] }
 name = "trace_context"
 required-features = ["mock"]
 
+[[test]]
+name = "logging"
+required-features = ["mock"]
+
 [[example]]
 name = "simple_trace_report"
 path = "examples/simple_trace_report.rs"

README.md

@@ -16,7 +16,9 @@ and core concepts to keep best compatibility and performance.
 
 All concepts are from the official SkyWalking definitions.
 
-## Span
+## Tracing
+
+### Span
 
 Span is an important and common concept in distributed tracing system. Learn Span from Google Dapper Paper. For better
 performance, we extend the span into 3 kinds.
@@ -34,19 +36,29 @@ Tag and Log are similar attributes of the span.
 - Log is heavier than tag, with one timestamp and multiple key:value pairs. Log represents an event, typically an error
   happens.
 
-## TracingContext
+### TracingContext
 
 TracingContext is the context of the tracing process. Span should only be created through context, and be archived into
 the context after the span finished.
 
+## Logging
+
+### LogRecord
+
+LogRecord is the simple builder for the LogData, which is the Log format of Skywalking.
+
 # Example
 
 ```rust, no_run
-use skywalking::{reporter::grpc::GrpcReporter, trace::tracer::Tracer};
+use skywalking::{
+    logging::{logger::Logger, record::{LogRecord, RecordType}},
+    reporter::grpc::GrpcReporter,
+    trace::tracer::Tracer,
+};
 use std::error::Error;
 use tokio::signal;
 
-async fn handle_request(tracer: Tracer) {
+async fn handle_request(tracer: Tracer, logger: Logger) {
     let mut ctx = tracer.create_trace_context();
 
     {
@@ -59,10 +71,20 @@ async fn handle_request(tracer: Tracer) {
 
         {
             // Generates an Exit Span when executing an RPC.
-            let _span2 = ctx.create_exit_span("op2", "remote_peer");
+            let span2 = ctx.create_exit_span("op2", "remote_peer");
 
             // Something...
 
+            // Do logging.
+            logger.log(
+                LogRecord::new()
+                    .add_tag("level", "INFO")
+                    .with_tracing_context(&ctx)
+                    .with_span(&span2)
+                    .record_type(RecordType::Text)
+                    .content("Something...")
+            );
+
             // Auto close span2 when dropped.
         }
 
@@ -74,17 +96,24 @@ async fn handle_request(tracer: Tracer) {
 
 #[tokio::main]
 async fn main() -> Result<(), Box<dyn Error>> {
+    // Connect to skywalking oap server.
     let reporter = GrpcReporter::connect("http://0.0.0.0:11800").await?;
-    let tracer = Tracer::new("service", "instance", reporter);
 
-    tokio::spawn(handle_request(tracer.clone()));
-
-    // Start to report.
-    tracer
-        .reporting(async move {
-            let _ = signal::ctrl_c().await.unwrap();
+    // Spawn the reporting in background, with listening the graceful shutdown signal.
+    let handle = reporter
+        .reporting()
+        .await
+        .with_graceful_shutdown(async move {
+            signal::ctrl_c().await.expect("failed to listen for event");
         })
-        .await?;
+        .spawn();
+
+    let tracer = Tracer::new("service", "instance", reporter.clone());
+    let logger = Logger::new("service", "instance", reporter);
+
+    handle_request(tracer, logger).await;
+
+    handle.await?;
 
     Ok(())
 }

docker-compose.e2e.yml

@@ -18,7 +18,7 @@
 version: "3.9"
 services:
   collector:
-    image: ghcr.io/apache/skywalking-agent-test-tool/mock-collector:5acb890f225ca37ee60675ce3e330545e23e3cbc
+    image: ghcr.io/apache/skywalking-agent-test-tool/mock-collector:f4f5ef22b1df623464772816bb6b42ba611444ff
     ports:
       - "19876:19876"
       - "12800:12800"

e2e/data/expected_context.yaml

@@ -16,7 +16,7 @@
 # under the License.
 #
 segmentItems:
-- segmentSize: gt 1
+- segmentSize: ge 2
   segments:
   - segmentId: not null
     spans:
@@ -76,7 +76,7 @@ segmentItems:
       spanType: Entry
       startTime: gt 0
   serviceName: producer
-- segmentSize: 1
+- segmentSize: ge 1
   segments:
   - segmentId: not null
     spans:
@@ -101,3 +101,48 @@ segmentItems:
       spanType: Entry
       startTime: gt 0
   serviceName: consumer
+
+logItems:
+- logSize: ge 2
+  logs:
+  - body:
+      content:
+        json: '{"message": "handle ping"}'
+      type: ''
+    endpoint: /ping
+    layer: ''
+    tags:
+      data:
+      - key: level
+        value: DEBUG
+    timestamp: gt 0
+  - body:
+      content:
+        text: do http request
+      type: ''
+    endpoint: /ping
+    layer: ''
+    tags:
+      data:
+      - key: level
+        value: INFO
+    timestamp: gt 0
+    traceContext:
+      spanId: 1
+      traceId: not null
+      traceSegmentId: not null
+  serviceName: producer
+- logSize: ge 1
+  logs:
+  - body:
+      content:
+        json: '{"message": "handle pong"}'
+      type: ''
+    endpoint: /pong
+    layer: ''
+    tags:
+      data:
+      - key: level
+        value: DEBUG
+    timestamp: gt 0
+  serviceName: consumer

e2e/src/main.rs

@@ -21,6 +21,10 @@ use hyper::{
     Body, Client, Method, Request, Response, Server, StatusCode,
 };
 use skywalking::{
+    logging::{
+        logger::{self, Logger},
+        record::{LogRecord, RecordType},
+    },
     reporter::grpc::GrpcReporter,
     trace::{
         propagation::{
@@ -30,7 +34,7 @@ use skywalking::{
         tracer::{self, Tracer},
     },
 };
-use std::{convert::Infallible, error::Error, future, net::SocketAddr};
+use std::{convert::Infallible, error::Error, net::SocketAddr};
 use structopt::StructOpt;
 
 static NOT_FOUND_MSG: &str = "not found";
@@ -40,10 +44,18 @@ async fn handle_ping(
     _req: Request<Body>,
     client: Client<HttpConnector>,
 ) -> Result<Response<Body>, Infallible> {
+    logger::log(
+        LogRecord::new()
+            .add_tag("level", "DEBUG")
+            .endpoint("/ping")
+            .record_type(RecordType::Json)
+            .content(r#"{"message": "handle ping"}"#),
+    );
+
     let mut context = tracer::create_trace_context();
     let _span = context.create_entry_span("/ping");
     {
-        let _span2 = context.create_exit_span("/pong", "consumer:8082");
+        let span2 = context.create_exit_span("/pong", "consumer:8082");
         let header = encode_propagation(&context, "/pong", "consumer:8082");
         let req = Request::builder()
             .method(Method::GET)
@@ -52,6 +64,15 @@ async fn handle_ping(
             .body(Body::from(""))
             .unwrap();
 
+        logger::log(
+            LogRecord::new()
+                .add_tag("level", "INFO")
+                .endpoint("/ping")
+                .with_tracing_context(&context)
+                .with_span(&span2)
+                .record_type(RecordType::Text)
+                .content("do http request"),
+        );
         client.request(req).await.unwrap();
     }
     {
@@ -106,6 +127,14 @@ async fn run_producer_service(host: [u8; 4]) {
 }
 
 async fn handle_pong(_req: Request<Body>) -> Result<Response<Body>, Infallible> {
+    logger::log(
+        LogRecord::new()
+            .add_tag("level", "DEBUG")
+            .endpoint("/pong")
+            .record_type(RecordType::Json)
+            .content(r#"{"message": "handle pong"}"#),
+    );
+
     let ctx = decode_propagation(
         _req.headers()[SKYWALKING_HTTP_CONTEXT_HEADER_KEY]
             .to_str()
@@ -154,20 +183,19 @@ struct Opt {
 async fn main() -> Result<(), Box<dyn Error>> {
     let opt = Opt::from_args();
     let reporter = GrpcReporter::connect("http://collector:19876").await?;
+    let handle = reporter.reporting().await.spawn();
 
-    let handle = if opt.mode == "consumer" {
-        tracer::set_global_tracer(Tracer::new("consumer", "node_0", reporter));
-        let handle = tracer::reporting(future::pending());
+    if opt.mode == "consumer" {
+        tracer::set_global_tracer(Tracer::new("consumer", "node_0", reporter.clone()));
+        logger::set_global_logger(Logger::new("consumer", "node_0", reporter));
         run_consumer_service([0, 0, 0, 0]).await;
-        handle
     } else if opt.mode == "producer" {
-        tracer::set_global_tracer(Tracer::new("producer", "node_0", reporter));
-        let handle = tracer::reporting(future::pending());
+        tracer::set_global_tracer(Tracer::new("producer", "node_0", reporter.clone()));
+        logger::set_global_logger(Logger::new("producer", "node_0", reporter));
         run_producer_service([0, 0, 0, 0]).await;
-        handle
     } else {
         unreachable!()
-    };
+    }
 
     handle.await?;
 

examples/simple_log_report.rs

@@ -0,0 +1,44 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+//
+
+use skywalking::{
+    logging::{logger::Logger, record::LogRecord},
+    reporter::grpc::GrpcReporter,
+};
+use std::{error::Error, future};
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn Error>> {
+    // Connect to skywalking oap server.
+    let reporter = GrpcReporter::connect("http://0.0.0.0:11800").await?;
+
+    // Do logging.
+    let logger = Logger::new("service", "instance", reporter.clone());
+    logger.log(LogRecord::new().content("something to log"));
+
+    // Start reporting and quit immediately when have completed the existing
+    // collection.
+    reporter
+        .reporting()
+        .await
+        .with_graceful_shutdown(future::ready(()))
+        .start()
+        .await?;
+
+    Ok(())
+}

examples/simple_trace_report.rs

@@ -48,17 +48,25 @@ async fn handle_request(tracer: Tracer) {
 
 #[tokio::main]
 async fn main() -> Result<(), Box<dyn Error>> {
+    // Connect to skywalking oap server.
     let reporter = GrpcReporter::connect("http://0.0.0.0:11800").await?;
-    let tracer = Tracer::new("service", "instance", reporter);
-
-    tokio::spawn(handle_request(tracer.clone()));
 
-    // Start to report.
-    tracer
-        .reporting(async move {
-            let _ = signal::ctrl_c().await.unwrap();
+    // Spawn the reporting in background, with listening the graceful shutdown
+    // signal.
+    let handle = reporter
+        .reporting()
+        .await
+        .with_graceful_shutdown(async move {
+            signal::ctrl_c().await.expect("failed to listen for event");
         })
-        .await?;
+        .spawn();
+
+    // Do tracing.
+    let tracer = Tracer::new("service", "instance", reporter);
+    handle_request(tracer).await;
+
+    // Wait the reporting to quit.
+    handle.await?;
 
     Ok(())
 }

src/common/mod.rs

@@ -15,3 +15,4 @@
 //
 
 pub mod random_generator;
+pub(crate) mod system_time;