Error slog attribute

.github/workflows/scorecard.yml

@@ -10,7 +10,7 @@ on:
   # To guarantee Maintained check is occasionally updated. See
   # https://github.com/ossf/scorecard/blob/main/docs/checks.md#maintained
   #schedule:
-    #- cron: '18 16 * * 2'
+    #- cron: '28 21 * * 1'
   push:
     branches: [ "main" ]
 
@@ -26,47 +26,39 @@ jobs:
       security-events: write
       # Needed to publish results and get a badge (see publish_results below).
       id-token: write
-      # Uncomment the permissions below if installing in a private repository.
-      # contents: read
-      # actions: read
 
     steps:
       - name: "Checkout code"
-        uses: actions/checkout@93ea575cb5d8a053eaa0ac8fa3b40d7e05a33cc8 # v3.1.0
+        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
         with:
           persist-credentials: false
 
       - name: "Run analysis"
-        uses: ossf/scorecard-action@e38b1902ae4f44df626f11ba0734b14fb91f8f86 # v2.1.2
+        uses: ossf/scorecard-action@0864cf19026789058feabb7e87baa5f140aac736 # v2.3.1
         with:
           results_file: results.sarif
           results_format: sarif
           # (Optional) "write" PAT token. Uncomment the `repo_token` line below if:
-          # - you want to enable the Branch-Protection check on a *public* repository, or
-          # - you are installing Scorecard on a *private* repository
+          # you want to enable the Branch-Protection check on a *public* repository, or
           # To create the PAT, follow the steps in https://github.com/ossf/scorecard-action#authentication-with-pat.
           # repo_token: ${{ secrets.SCORECARD_TOKEN }}
 
-          # Public repositories:
-          #   - Publish results to OpenSSF REST API for easy access by consumers
-          #   - Allows the repository to include the Scorecard badge.
-          #   - See https://github.com/ossf/scorecard-action#publishing-results.
-          # For private repositories:
-          #   - `publish_results` will always be set to `false`, regardless
-          #     of the value entered here.
+          # - Publish results to OpenSSF REST API for easy access by consumers
+          # - Allows the repository to include the Scorecard badge.
+          # - See https://github.com/ossf/scorecard-action#publishing-results.
           publish_results: true
 
       # Upload the results as artifacts (optional). Commenting out will disable uploads of run results in SARIF
       # format to the repository Actions tab.
       - name: "Upload artifact"
-        uses: actions/upload-artifact@3cea5372237819ed00197afe530f5a7ea3e805c8 # v3.1.0
+        uses: actions/upload-artifact@5d5d22a31266ced268874388b861e4b58bb5c2f3 # v4.3.1
         with:
           name: SARIF file
           path: results.sarif
           retention-days: 5
 
       # Upload the results to GitHub's code scanning dashboard.
       - name: "Upload to code-scanning"
-        uses: github/codeql-action/upload-sarif@17573ee1cc1b9d061760f3a006fc4aac4f944fd5 # v2.2.4
+        uses: github/codeql-action/upload-sarif@8a470fddafa5cbb6266ee11b37ef4d8aae19c571 # v3.24.6
         with:
           sarif_file: results.sarif

README.md

@@ -51,8 +51,9 @@ down the stack and with any libraries that use either slog-context or logr.
 ### Other Great SLOG Utilities
 - [slogctx](https://github.com/veqryn/slog-context): Add attributes to context and have them automatically added to all log lines. Work with a logger stored in context.
 - [slogotel](https://github.com/veqryn/slog-context/tree/main/otel): Automatically extract and add [OpenTelemetry](https://opentelemetry.io/) TraceID's to all log lines.
-- [slogdedup](https://github.com/veqryn/slog-dedup): Middleware that deduplicates and sorts attributes. Particularly useful for JSON logging.
+- [slogdedup](https://github.com/veqryn/slog-dedup): Middleware that deduplicates and sorts attributes. Particularly useful for JSON logging. Format logs for aggregators (Graylog, GCP/Stackdriver, etc).
 - [slogbugsnag](https://github.com/veqryn/slog-bugsnag): Middleware that pipes Errors to [Bugsnag](https://www.bugsnag.com/).
+- [slogjson](https://github.com/veqryn/slog-json): Formatter that uses the [JSON v2](https://github.com/golang/go/discussions/63397) [library](https://github.com/go-json-experiment/json), with optional single-line pretty-printing.
 
 ## Install
 
@@ -73,6 +74,7 @@ package main
 
 import (
 	"context"
+	"errors"
 	"log/slog"
 	"os"
 
@@ -96,7 +98,7 @@ import (
 // logger and its attributes will propagate with it, adding these to any log
 // lines using that context.
 func main() {
-	h := slog.NewJSONHandler(os.Stdout, nil)
+	h := slogctx.NewHandler(slog.NewJSONHandler(os.Stdout, nil), nil)
 	slog.SetDefault(slog.New(h))
 
 	// Store the logger inside the context:
@@ -123,17 +125,22 @@ func main() {
 	// and can take a mix of slog.Attr and key-value pairs.
 	ctx = slogctx.With(ctx, slog.String("subKey", "subValue"), slog.Bool("someBool", true))
 
+	err := errors.New("an error")
+
 	// Access the logger in the context directly with handy wrappers for Debug/Info/Warn/Error/Log/LogAttrs:
-	slogctx.Info(ctx, "main message", "mainKey", "mainValue")
+	slogctx.Error(ctx, "main message",
+		slogctx.Err(err),
+		slog.String("mainKey", "mainValue"))
 	/*
 		{
 			"time":"2023-11-14T00:53:46.363072-07:00",
-			"level":"INFO",
+			"level":"ERROR",
 			"msg":"main message",
 			"rootKey":"rootValue",
 			"someGroup":{
 				"subKey":"subValue",
 				"someBool":true,
+				"err":"an error",
 				"mainKey":"mainValue"
 			}
 		}

ctx_test.go

@@ -3,6 +3,7 @@ package slogctx
 import (
 	"bytes"
 	"context"
+	"errors"
 	"log/slog"
 	"testing"
 )
@@ -80,8 +81,8 @@ func TestCtx(t *testing.T) {
 	}
 
 	buf.Reset()
-	Error(ctx, "main message", "main1", "arg1", "main1", "arg2")
-	expectedError := `{"time":"2023-09-29T13:00:59Z","level":"ERROR","msg":"main message","with1":"arg1","with1":"arg2","with2":"arg1","with2":"arg2","group1":{"with4":"arg1","with4":"arg2","with5":"arg1","with5":"arg2","main1":"arg1","main1":"arg2"}}
+	Error(ctx, "main message", "main1", "arg1", "main1", "arg2", Err(errors.New("an error")))
+	expectedError := `{"time":"2023-09-29T13:00:59Z","level":"ERROR","msg":"main message","with1":"arg1","with1":"arg2","with2":"arg1","with2":"arg2","group1":{"with4":"arg1","with4":"arg2","with5":"arg1","with5":"arg2","main1":"arg1","main1":"arg2","err":"an error"}}
 `
 	if buf.String() != expectedError {
 		t.Errorf("Expected:\n%s\nGot:\n%s\n", expectedError, buf.String())

examples/logger-in-ctx/logger-in-ctx-main.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"context"
+	"errors"
 	"log/slog"
 	"os"
 
@@ -25,7 +26,7 @@ import (
 // logger and its attributes will propagate with it, adding these to any log
 // lines using that context.
 func main() {
-	h := slog.NewJSONHandler(os.Stdout, nil)
+	h := slogctx.NewHandler(slog.NewJSONHandler(os.Stdout, nil), nil)
 	slog.SetDefault(slog.New(h))
 
 	// Store the logger inside the context:
@@ -52,17 +53,22 @@ func main() {
 	// and can take a mix of slog.Attr and key-value pairs.
 	ctx = slogctx.With(ctx, slog.String("subKey", "subValue"), slog.Bool("someBool", true))
 
+	err := errors.New("an error")
+
 	// Access the logger in the context directly with handy wrappers for Debug/Info/Warn/Error/Log/LogAttrs:
-	slogctx.Info(ctx, "main message", "mainKey", "mainValue")
+	slogctx.Error(ctx, "main message",
+		slogctx.Err(err),
+		slog.String("mainKey", "mainValue"))
 	/*
 		{
 			"time":"2023-11-14T00:53:46.363072-07:00",
-			"level":"INFO",
+			"level":"ERROR",
 			"msg":"main message",
 			"rootKey":"rootValue",
 			"someGroup":{
 				"subKey":"subValue",
 				"someBool":true,
+				"err":"an error",
 				"mainKey":"mainValue"
 			}
 		}

examples_test.go

@@ -2,6 +2,7 @@ package slogctx_test
 
 import (
 	"context"
+	"errors"
 	"log/slog"
 	"os"
 
@@ -56,7 +57,7 @@ func ExampleNewHandler() {
 	// Use the logger like normal; add attributes, create groups, pass it around:
 	log := slog.With("rootKey", "rootValue")
 	log = log.WithGroup("someGroup")
-	log = log.With("subKey", "subValue8")
+	log = log.With("subKey", "subValue")
 
 	// The prepended/appended attributes end up in all log lines that use that context
 	log.InfoContext(ctx, "main message", "mainKey", "mainValue")
@@ -94,7 +95,7 @@ func ExampleNewCtx() {
 	// logger and its attributes will propagate with it, adding these to any log
 	// lines using that context.
 
-	h := slog.NewJSONHandler(os.Stdout, nil)
+	h := slogctx.NewHandler(slog.NewJSONHandler(os.Stdout, nil), nil)
 	slog.SetDefault(slog.New(h))
 
 	// Store the logger inside the context:
@@ -103,6 +104,13 @@ func ExampleNewCtx() {
 	// Get the logger back out again at any time, for manual usage:
 	log := slogctx.FromCtx(ctx)
 	log.Warn("warning")
+	/*
+		{
+			"time":"2023-11-14T00:53:46.361201-07:00",
+			"level":"INFO",
+			"msg":"warning"
+		}
+	*/
 
 	// Add attributes directly to the logger in the context:
 	ctx = slogctx.With(ctx, "rootKey", "rootValue")
@@ -112,18 +120,24 @@ func ExampleNewCtx() {
 
 	// With and wrapper methods have the same args signature as slog methods,
 	// and can take a mix of slog.Attr and key-value pairs.
-	ctx = slogctx.With(ctx, slog.String("subKey", "subValue"))
+	ctx = slogctx.With(ctx, slog.String("subKey", "subValue"), slog.Bool("someBool", true))
+
+	err := errors.New("an error")
 
 	// Access the logger in the context directly with handy wrappers for Debug/Info/Warn/Error/Log/LogAttrs:
-	slogctx.Info(ctx, "main message", "mainKey", "mainValue")
+	slogctx.Error(ctx, "main message",
+		slogctx.Err(err),
+		slog.String("mainKey", "mainValue"))
 	/*
 		{
 			"time":"2023-11-14T00:53:46.363072-07:00",
-			"level":"INFO",
+			"level":"ERROR",
 			"msg":"main message",
 			"rootKey":"rootValue",
 			"someGroup":{
 				"subKey":"subValue",
+				"someBool":true,
+				"err":"an error",
 				"mainKey":"mainValue"
 			}
 		}

wrappers.go

@@ -7,6 +7,16 @@ import (
 	"time"
 )
 
+// ErrKey is the key used by handlers for an error
+// when the log method is called. The associated Value is an error.
+const ErrKey = "err" // TODO: consider making a var to allow changes before.
+
+// Err is a convenience method that creates a [slog.Attr] out of an error.
+// It uses a consistent key: [ErrKey]
+func Err(err error) slog.Attr {
+	return slog.Any(ErrKey, err)
+}
+
 // With calls With on the logger stored in the context,
 // or if there isn't any, on the default logger.
 // This new logger is stored in a child context and the new context is returned.