Log warning message when a deprecated function or datasource is used

Signed-off-by: Dave Henderson <dhenderson@gmail.com>

2 files changed, 19 insertions, 4 deletions

diff --git a/internal/deprecated/deprecated.go b/internal/deprecated/deprecated.go
new file mode 100644
index 00000000..c453ebbe
--- /dev/null
+++ b/internal/deprecated/deprecated.go
@@ -0,0 +1,14 @@
+package deprecated
+
+import (
+	"context"
+
+	"github.com/rs/zerolog"
+)
+
+// WarnDeprecated - use this to warn about deprecated template functions or
+// datasources
+func WarnDeprecated(ctx context.Context, msg string) {
+	logger := zerolog.Ctx(ctx)
+	logger.Warn().Msgf("Deprecated: %s", msg)
+}
diff --git a/internal/tests/integration/datasources_boltdb_test.go b/internal/tests/integration/datasources_boltdb_test.go
index fbae9782..848a3119 100644
--- a/internal/tests/integration/datasources_boltdb_test.go
+++ b/internal/tests/integration/datasources_boltdb_test.go
@@ -43,12 +43,13 @@ func setupDatasourcesBoltDBTest(t *testing.T) *fs.Dir {
 func TestDatasources_BoltDB_Datasource(t *testing.T) {
 	tmpDir := setupDatasourcesBoltDBTest(t)
 
-	o, e, err := cmd(t, "-d", "config=boltdb://"+tmpDir.Join("config.db#Bucket1"),
+	// ignore the stderr output, it'll contain boltdb deprecation warning
+	o, _, err := cmd(t, "-d", "config=boltdb://"+tmpDir.Join("config.db#Bucket1"),
 		"-i", `{{(ds "config" "foo")}}`).run()
-	assertSuccess(t, o, e, err, "bar")
+	assertSuccess(t, o, "", err, "bar")
 
-	o, e, err = cmd(t, "-d", "config=boltdb://"+tmpDir.Join("config.db#Bucket1"),
+	o, _, err = cmd(t, "-d", "config=boltdb://"+tmpDir.Join("config.db#Bucket1"),
 		"-d", "config2=boltdb://"+tmpDir.Join("config.db#Bucket2"),
 		"-i", `{{(ds "config" "foo")}}-{{(ds "config2" "foobar")}}`).run()
-	assertSuccess(t, o, e, err, "bar-baz")
+	assertSuccess(t, o, "", err, "bar-baz")
 }