chore: import upstream snapshot with attribution

utils/pprof.go

@@ -0,0 +1,79 @@
+// Copyright 2024 Dolthub, Inc.
+//
+// Licensed 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.
+
+package utils
+
+import (
+	"sync"
+
+	"github.com/pkg/profile"
+)
+
+// prof is the global profiler that is in use. This should only be interacted with via StartProfiling and StopProfiling.
+var prof interface{ Stop() }
+
+// profMutex is the mutex that handles concurrent manipulations of prof.
+var profMutex = &sync.Mutex{}
+
+// ProfilingOptions contains all options for starting the profiler.
+type ProfilingOptions struct {
+	CPU    bool
+	Memory bool
+	Block  bool
+	Trace  bool
+	Path   string
+}
+
+// StartProfiling starts profiling the CPU.
+func StartProfiling(options ProfilingOptions) {
+	profMutex.Lock()
+	defer profMutex.Unlock()
+
+	if !options.HasOptions() {
+		return
+	}
+	profOpts := []func(p *profile.Profile){profile.NoShutdownHook}
+	if options.CPU {
+		profOpts = append(profOpts, profile.CPUProfile)
+	}
+	if options.Memory {
+		profOpts = append(profOpts, profile.MemProfile)
+	}
+	if options.Block {
+		profOpts = append(profOpts, profile.BlockProfile)
+	}
+	if options.Trace {
+		profOpts = append(profOpts, profile.TraceProfile)
+	}
+	if len(options.Path) > 0 {
+		profOpts = append(profOpts, profile.ProfilePath(options.Path))
+	}
+	prof = profile.Start(profOpts...)
+}
+
+// StopProfiling stops profiling the CPU.
+func StopProfiling() {
+	profMutex.Lock()
+	defer profMutex.Unlock()
+
+	if prof != nil {
+		prof.Stop()
+		prof = nil
+	}
+}
+
+// HasOptions returns true when at least one profiler target has been selected.
+func (options ProfilingOptions) HasOptions() bool {
+	return options.CPU || options.Memory || options.Block || options.Trace
+}