forked from driskell/log-courier
/
api_debug.go
61 lines (51 loc) · 1.61 KB
/
api_debug.go
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/*
* Copyright 2014-2015 Jason Woods.
*
* 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 admin
import (
"bytes"
"encoding/json"
"runtime/pprof"
)
// apiDebug is an entry that provides debugging information
type apiDebug struct{}
// MarshalJSON returns the APICallbackEntry in JSON form
func (c *apiDebug) MarshalJSON() ([]byte, error) {
stack, err := c.GoRoutineBytes()
if err != nil {
stack = []byte(err.Error())
}
return json.Marshal(struct {
Stack string
}{
Stack: string(stack),
})
}
// HumanReadable returns the APICallbackEntry as a string
func (c *apiDebug) HumanReadable(indent string) ([]byte, error) {
return c.GoRoutineBytes()
}
// GoRoutineBytes returns a byte slice containing the goroutine profile, or an
// error message if an error occurred
func (c *apiDebug) GoRoutineBytes() ([]byte, error) {
log.Warning("Generating pprof goroutine profile for debug API call")
goroutine := pprof.Lookup("goroutine")
buffer := new(bytes.Buffer)
// debug=2 so we print same trace we get when we panic
if err := goroutine.WriteTo(buffer, 2); err != nil {
return nil, err
}
return buffer.Bytes(), nil
}