From bdd886a28f40472c3a73d455d4bd1a84a028971d Mon Sep 17 00:00:00 2001
From: Alfonso Acosta <fons@weave.works>
Date: Wed, 19 Aug 2015 15:54:11 +0000
Subject: [PATCH] Don't report empty fields from process

---
 probe/process/reporter.go      | 17 +++++++++++------
 probe/process/reporter_test.go | 10 +++++++---
 2 files changed, 18 insertions(+), 9 deletions(-)

diff --git a/probe/process/reporter.go b/probe/process/reporter.go
index 6ab7db82f..dd595cbc2 100644
--- a/probe/process/reporter.go
+++ b/probe/process/reporter.go
@@ -45,12 +45,17 @@ func (r *Reporter) processTopology() (report.Topology, error) {
 	err := r.walker.Walk(func(p Process) {
 		pidstr := strconv.Itoa(p.PID)
 		nodeID := report.MakeProcessNodeID(r.scope, pidstr)
-		t.NodeMetadatas[nodeID] = report.MakeNodeMetadataWith(map[string]string{
-			PID:     pidstr,
-			Comm:    p.Comm,
-			Cmdline: p.Cmdline,
-			Threads: strconv.Itoa(p.Threads),
-		})
+		t.NodeMetadatas[nodeID] = report.MakeNodeMetadata()
+		for _, tuple := range []struct{ key, value string }{
+			{PID, pidstr},
+			{Comm, p.Comm},
+			{Cmdline, p.Cmdline},
+			{Threads, strconv.Itoa(p.Threads)},
+		} {
+			if tuple.value != "" {
+				t.NodeMetadatas[nodeID].Metadata[tuple.key] = tuple.value
+			}
+		}
 		if p.PPID > 0 {
 			t.NodeMetadatas[nodeID].Metadata[PPID] = strconv.Itoa(p.PPID)
 		}
diff --git a/probe/process/reporter_test.go b/probe/process/reporter_test.go
index 2780d7ff0..1e4bf4858 100644
--- a/probe/process/reporter_test.go
+++ b/probe/process/reporter_test.go
@@ -27,6 +27,7 @@ func TestReporter(t *testing.T) {
 			{PID: 2, PPID: 1, Comm: "bash"},
 			{PID: 3, PPID: 1, Comm: "apache", Threads: 2},
 			{PID: 4, PPID: 2, Comm: "ping", Cmdline: "ping foo.bar.local"},
+			{PID: 5, PPID: 1, Cmdline: "tail -f /var/log/syslog"},
 		},
 	}
 
@@ -39,21 +40,18 @@ func TestReporter(t *testing.T) {
 			report.MakeProcessNodeID("", "1"): report.MakeNodeMetadataWith(map[string]string{
 				process.PID:     "1",
 				process.Comm:    "init",
-				process.Cmdline: "",
 				process.Threads: "0",
 			}),
 			report.MakeProcessNodeID("", "2"): report.MakeNodeMetadataWith(map[string]string{
 				process.PID:     "2",
 				process.Comm:    "bash",
 				process.PPID:    "1",
-				process.Cmdline: "",
 				process.Threads: "0",
 			}),
 			report.MakeProcessNodeID("", "3"): report.MakeNodeMetadataWith(map[string]string{
 				process.PID:     "3",
 				process.Comm:    "apache",
 				process.PPID:    "1",
-				process.Cmdline: "",
 				process.Threads: "2",
 			}),
 			report.MakeProcessNodeID("", "4"): report.MakeNodeMetadataWith(map[string]string{
@@ -63,6 +61,12 @@ func TestReporter(t *testing.T) {
 				process.Cmdline: "ping foo.bar.local",
 				process.Threads: "0",
 			}),
+			report.MakeProcessNodeID("", "5"): report.MakeNodeMetadataWith(map[string]string{
+				process.PID:     "5",
+				process.PPID:    "1",
+				process.Cmdline: "tail -f /var/log/syslog",
+				process.Threads: "0",
+			}),
 		},
 	}