We now call wg.Add(n) before we loop over n observers. We also run the
loop inside a goroutine and therefore more quickly handle all (pid,
offset) pairs.
By introducing a lowercase type alias 'logger' for *log.Logger we can
now embed 'logger' in Scanner and not export it:
% go doc Scanner
package symbolyze // import "."
type Scanner struct {
// Has unexported fields.
}
symbolyze.go has been simplified and cleaned up. It now also is documented,
f.e.:
% go doc Scanner
package symbolyze // import "."
type Scanner struct {
*log.Logger // Embedded logger
// Has unexported fields.
}
Scanner represents an engine for scanning for a specific symbol in all
ELF-files matching a certain pattern. The pattern is described in
fileapth.Match().
Once a Scanner is created with New(), it should be populated with Observer
functions using OnFound(). Optionally, the scanner can be put into debugging
mode by a call to DebugOn() prior to a call to Run().
A call to Scanner.Run() then starts the engine and it will scan all pids in
/proc. Whenever a match is found, all observers will be called with the
(pid, offset), concurrently.
func New(symbol, pathglob string) *Scanner
func (S *Scanner) DebugOn()
func (S *Scanner) OnFound(fun Observer)
func (S *Scanner) Run() error
symbolyze/ now contains a module that exposes a Finder type with a
simple API, like:
finder := symbolyze.New("_PyRuntime", "*python3*")
finder.Debug(true)
finder.OnFound(mapFD.Set)
finder.Run()
Instead of writing (pid, offset) directly to a eBPF-map, it implements
an observer-pattern and expects a callback.
TODOs/next steps:
- Write documentation
- Add tests
- Experiment and re-evaluate design
