stack
-- import "github.com/facebookgo/stack"
Package stack provides utilities to capture and pass around stack traces.
This is useful for building errors that know where they originated from, to track where a certain log event occured and so on.
The package provides stack.Multi which represents a sequence of stack traces. Since in Go we return errors they don't necessarily end up with a single useful stack trace. For example an error may be going thru a channel across goroutines, in which case we may want to capture a stack trace in both (or many) goroutines. stack.Multi in turn is made up of stack.Stack, which is a set of stack.Frames. Each stack.Frame contains the File/Line/Name (function name). All these types implement a pretty human readable String() function.
The GOPATH is stripped from the File location. Look at the StripGOPATH function on instructions for how to embed to GOPATH into the binary for when deploying to production and the GOPATH environment variable may not be set. The package name is stripped from the Name of the function since it included in the File location.
Usage
func StripGOPATH
func StripGOPATH(f string) stringStripGOPATH strips the GOPATH prefix from the file path f. In development, this will be done using the GOPATH environment variable. For production builds, where the GOPATH environment will not be set, the GOPATH can be included in the binary by passing ldflags, for example:
GO_LDFLAGS="$GO_LDFLAGS -X github.com/facebookgo/stack.gopath $GOPATH"
go install "-ldflags=$GO_LDFLAGS" my/pkg
func StripPackage
func StripPackage(n string) stringStripPackage strips the package name from the given Func.Name.
type Frame
type Frame struct {
File string
Line int
Name string
}Frame identifies a file, line & function name in the stack.
func Caller
func Caller(skip int) FrameCaller returns a single Frame for the caller. The argument skip is the number of stack frames to ascend, with 0 identifying the caller of Callers.
func (Frame) String
func (f Frame) String() stringString provides the standard file:line representation.
type Multi
type Multi struct {
}Multi represents a number of Stacks. This is useful to allow tracking a value as it travels thru code.
func CallersMulti
func CallersMulti(skip int) *MultiCallersMulti returns a Multi which includes one Stack for the current callers. The argument skip is the number of stack frames to ascend, with 0 identifying the caller of CallersMulti.
func (*Multi) Add
func (m *Multi) Add(s Stack)Add the given Stack to this Multi.
func (*Multi) AddCallers
func (m *Multi) AddCallers(skip int)AddCallers adds the Callers Stack to this Multi. The argument skip is the number of stack frames to ascend, with 0 identifying the caller of Callers.
func (*Multi) Stacks
func (m *Multi) Stacks() []StackStacks returns the tracked Stacks.
func (*Multi) String
func (m *Multi) String() stringString provides a human readable multi-line stack trace.
type Stack
type Stack []FrameStack represents an ordered set of Frames.
func Callers
func Callers(skip int) StackCallers returns a Stack of Frames for the callers. The argument skip is the number of stack frames to ascend, with 0 identifying the caller of Callers.
func (Stack) String
func (s Stack) String() stringString provides the standard multi-line stack trace.