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Merge pull request #320 from weaveworks/process-names-on-darwin
Naïve process walker for Darwin
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,93 @@ | ||
| package process | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "os/exec" | ||
| "strconv" | ||
| "strings" | ||
| ) | ||
|
|
||
| // NewWalker returns a Darwin (lsof-based) walker. | ||
| func NewWalker(_ string) Walker { | ||
| return &walker{} | ||
| } | ||
|
|
||
| type walker struct{} | ||
|
|
||
| const ( | ||
| lsofBinary = "lsof" | ||
| lsofFields = "cn" // parseLSOF() depends on the order | ||
| ) | ||
|
|
||
| // These functions copied from procspy. | ||
|
|
||
| func (walker) Walk(f func(Process)) error { | ||
| output, err := exec.Command( | ||
| lsofBinary, | ||
| "-i", // only Internet files | ||
| "-n", "-P", // no number resolving | ||
| "-w", // no warnings | ||
| "-F", lsofFields, // \n based output of only the fields we want. | ||
| ).CombinedOutput() | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| processes, err := parseLSOF(string(output)) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| for _, process := range processes { | ||
| f(process) | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func parseLSOF(output string) (map[string]Process, error) { | ||
| var ( | ||
| processes = map[string]Process{} // Local addr -> Proc | ||
| process Process | ||
| ) | ||
| for _, line := range strings.Split(output, "\n") { | ||
| if len(line) <= 1 { | ||
| continue | ||
| } | ||
|
|
||
| var ( | ||
| field = line[0] | ||
| value = line[1:] | ||
| ) | ||
| switch field { | ||
| case 'p': | ||
| pid, err := strconv.Atoi(value) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("invalid 'p' field in lsof output: %#v", value) | ||
| } | ||
| process.PID = pid | ||
|
|
||
| case 'c': | ||
| process.Comm = value | ||
|
|
||
| case 'n': | ||
| // 'n' is the last field, with '-F cn' | ||
| // format examples: | ||
| // "192.168.2.111:44013->54.229.241.196:80" | ||
| // "[2003:45:2b57:8900:1869:2947:f942:aba7]:55711->[2a00:1450:4008:c01::11]:443" | ||
| // "*:111" <- a listen | ||
| addresses := strings.SplitN(value, "->", 2) | ||
| if len(addresses) != 2 { | ||
| // That's a listen entry. | ||
| continue | ||
| } | ||
| processes[addresses[0]] = Process{ | ||
| PID: process.PID, | ||
| Comm: process.Comm, | ||
| } | ||
|
|
||
| default: | ||
| return nil, fmt.Errorf("unexpected lsof field: %c in %#v", field, value) | ||
| } | ||
| } | ||
| return processes, nil | ||
| } |
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