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https://github.com/weaveworks/scope.git
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d715ccc391
Since https://github.com/weaveworks/tcptracer-bpf/pull/39, tcptracer-bpf can generate "fd_install" events when a process installs a new file descriptor in its fd table. Those events must be requested explicitely on a per-pid basis with tracer.AddFdInstallWatcher(pid). This is useful to know about "accept" events that would otherwise be missed because kretprobes are not triggered for functions that were called before the installation of the kretprobe. This patch find all the processes that are currently blocked on an accept() syscall during the EbpfTracker initialization. feedInitialConnections() will use tracer.AddFdInstallWatcher() to subscribe to fd_install events. When a fd_install event is received, synthesise an accept event with the connection tuple and the network namespace (from /proc).
100 lines
2.3 KiB
Go
100 lines
2.3 KiB
Go
package process_test
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import (
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"reflect"
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"testing"
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fs_hook "github.com/weaveworks/common/fs"
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"github.com/weaveworks/common/test"
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"github.com/weaveworks/common/test/fs"
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"github.com/weaveworks/scope/probe/process"
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)
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var mockFS = fs.Dir("",
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fs.Dir("proc",
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fs.Dir("3",
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fs.File{
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FName: "cmdline",
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FContents: "curl\000google.com",
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},
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fs.File{
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FName: "stat",
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FContents: "3 na R 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 2 2048",
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},
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fs.File{
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FName: "limits",
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FContents: "Limit Soft-Limit Hard-Limit Units\nMax open files 32768 65536 files",
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},
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fs.Dir("fd", fs.File{FName: "0"}, fs.File{FName: "1"}, fs.File{FName: "2"}),
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),
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fs.Dir("2",
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fs.File{
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FName: "cmdline",
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FContents: "bash",
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},
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fs.File{
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FName: "stat",
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FContents: "2 na R 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0",
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},
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fs.File{
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FName: "limits",
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FContents: ``,
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},
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fs.Dir("fd", fs.File{FName: "1"}, fs.File{FName: "2"}),
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),
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fs.Dir("4",
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fs.File{
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FName: "cmdline",
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FContents: "apache",
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},
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fs.File{
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FName: "stat",
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FContents: "4 na R 3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0",
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},
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fs.File{
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FName: "limits",
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FContents: ``,
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},
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fs.Dir("fd", fs.File{FName: "0"}),
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),
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fs.Dir("notapid"),
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fs.Dir("1",
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fs.File{
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FName: "cmdline",
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FContents: "init",
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},
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fs.File{
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FName: "stat",
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FContents: "1 na R 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0",
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},
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fs.File{
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FName: "limits",
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FContents: ``,
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},
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fs.Dir("fd"),
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),
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),
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)
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func TestWalker(t *testing.T) {
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fs_hook.Mock(mockFS)
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defer fs_hook.Restore()
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want := map[int]process.Process{
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3: {PID: 3, PPID: 2, Name: "curl", Cmdline: "curl google.com", Threads: 1, RSSBytes: 8192, RSSBytesLimit: 2048, OpenFilesCount: 3, OpenFilesLimit: 32768},
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2: {PID: 2, PPID: 1, Name: "bash", Cmdline: "bash", Threads: 1, OpenFilesCount: 2},
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4: {PID: 4, PPID: 3, Name: "apache", Cmdline: "apache", Threads: 1, OpenFilesCount: 1},
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1: {PID: 1, PPID: 0, Name: "init", Cmdline: "init", Threads: 1, OpenFilesCount: 0},
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}
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have := map[int]process.Process{}
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walker := process.NewWalker("/proc", false)
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err := walker.Walk(func(p, _ process.Process) {
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have[p.PID] = p
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})
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if err != nil || !reflect.DeepEqual(want, have) {
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t.Errorf("%v (%v)", test.Diff(want, have), err)
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}
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}
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