snapshot of https://github.com/mattermost/mattermost.git (master, 2026-09-16; blobs > 131072B omitted)

tools/mattermost-govet/structuredLogging/testdata/src/a/a.go

@@ -0,0 +1,71 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package a
+
+import "fmt"
+
+type mlog struct{}
+
+func (m *mlog) Debug(msg string, fields ...interface{}) {}
+func (m *mlog) Info(msg string, fields ...interface{})  {}
+func (m *mlog) Warn(msg string, fields ...interface{})  {}
+func (m *mlog) Error(msg string, fields ...interface{}) {}
+func (m *mlog) Critical(msg string, fields ...interface{}) {}
+func (m *mlog) String(key, val string) interface{} { return nil }
+
+var Mlog = &mlog{}
+
+func validStructuredLogging() {
+	// Valid: using structured logging correctly
+	mlog := Mlog
+	mlog.Debug("User logged in", mlog.String("user_id", "123"))
+	mlog.Info("Server started", mlog.String("port", "8065"))
+	mlog.Warn("High memory usage", mlog.String("usage", "90%"))
+	mlog.Error("Database connection failed", mlog.String("error", "timeout"))
+	mlog.Critical("System failure", mlog.String("component", "auth"))
+
+	// Valid: simple string messages without formatting
+	mlog.Debug("Simple message")
+	mlog.Info("Another message")
+
+	// Valid: fmt outside of mlog calls
+	msg := fmt.Sprintf("User %s logged in", "john")
+	_ = msg
+}
+
+func invalidStructuredLogging() {
+	mlog := Mlog
+
+	// Invalid: using fmt.Sprintf inside mlog.Debug
+	mlog.Debug(fmt.Sprintf("User %s logged in", "john")) // want "Using fmt inside mlog function, use structured logging instead"
+
+	// Invalid: using fmt.Sprintf inside mlog.Info
+	mlog.Info(fmt.Sprintf("Server started on port %d", 8065)) // want "Using fmt inside mlog function, use structured logging instead"
+
+	// Invalid: using fmt.Sprintf inside mlog.Warn
+	mlog.Warn(fmt.Sprintf("Memory usage: %d%%", 90)) // want "Using fmt inside mlog function, use structured logging instead"
+
+	// Invalid: using fmt.Sprintf inside mlog.Error
+	mlog.Error(fmt.Sprintf("Failed to connect: %v", "timeout")) // want "Using fmt inside mlog function, use structured logging instead"
+
+	// Invalid: using fmt.Sprintf inside mlog.Critical
+	mlog.Critical(fmt.Sprintf("System failure in %s", "auth")) // want "Using fmt inside mlog function, use structured logging instead"
+
+	// Invalid: using fmt.Sprint inside mlog calls
+	mlog.Debug(fmt.Sprint("User logged in")) // want "Using fmt inside mlog function, use structured logging instead"
+	mlog.Info(fmt.Sprint("Server started")) // want "Using fmt inside mlog function, use structured logging instead"
+}
+
+func edgeCases() {
+	mlog := Mlog
+
+	// Valid: fmt.Sprintf in subsequent arguments (not first)
+	mlog.Debug("Message", mlog.String("key", fmt.Sprintf("value %d", 123)))
+
+	// Valid: different function names
+	mlog.Debug("Message")
+
+	// Valid: no arguments
+	mlog.Debug("")
+}