1 files changed, 130 insertions, 0 deletions
diff --git a/src/go/plugin/go.d/modules/tomcat/collect.go b/src/go/plugin/go.d/modules/tomcat/collect.go
new file mode 100644
index 000000000..c6e2a74bd
--- /dev/null
+++ b/src/go/plugin/go.d/modules/tomcat/collect.go
@@ -0,0 +1,130 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package tomcat
+
+import (
+	"encoding/xml"
+	"errors"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"strings"
+
+	"github.com/netdata/netdata/go/plugins/plugin/go.d/pkg/stm"
+	"github.com/netdata/netdata/go/plugins/plugin/go.d/pkg/web"
+)
+
+var (
+	urlPathServerStatus  = "/manager/status"
+	urlQueryServerStatus = url.Values{"XML": {"true"}}.Encode()
+)
+
+func (t *Tomcat) collect() (map[string]int64, error) {
+	mx, err := t.collectServerStatus()
+	if err != nil {
+		return nil, err
+	}
+
+	return mx, nil
+}
+
+func (t *Tomcat) collectServerStatus() (map[string]int64, error) {
+	resp, err := t.queryServerStatus()
+	if err != nil {
+		return nil, err
+	}
+
+	if len(resp.Connectors) == 0 {
+		return nil, errors.New("unexpected response: not tomcat server status data")
+	}
+
+	seenConns, seenPools := make(map[string]bool), make(map[string]bool)
+
+	for i, v := range resp.Connectors {
+		resp.Connectors[i].STMKey = cleanName(v.Name)
+		ti := &resp.Connectors[i].ThreadInfo
+		ti.CurrentThreadsIdle = ti.CurrentThreadCount - ti.CurrentThreadsBusy
+
+		seenConns[v.Name] = true
+		if !t.seenConnectors[v.Name] {
+			t.seenConnectors[v.Name] = true
+			t.addConnectorCharts(v.Name)
+		}
+	}
+
+	for i, v := range resp.JVM.MemoryPools {
+		resp.JVM.MemoryPools[i].STMKey = cleanName(v.Name)
+
+		seenPools[v.Name] = true
+		if !t.seenMemPools[v.Name] {
+			t.seenMemPools[v.Name] = true
+			t.addMemPoolCharts(v.Name, v.Type)
+		}
+	}
+
+	for name := range t.seenConnectors {
+		if !seenConns[name] {
+			delete(t.seenConnectors, name)
+			t.removeConnectorCharts(name)
+		}
+	}
+
+	for name := range t.seenMemPools {
+		if !seenPools[name] {
+			delete(t.seenMemPools, name)
+			t.removeMemoryPoolCharts(name)
+		}
+	}
+
+	resp.JVM.Memory.Used = resp.JVM.Memory.Total - resp.JVM.Memory.Free
+
+	return stm.ToMap(resp), nil
+}
+
+func cleanName(name string) string {
+	r := strings.NewReplacer(" ", "_", ".", "_", "\"", "", "'", "")
+	return strings.ToLower(r.Replace(name))
+}
+
+func (t *Tomcat) queryServerStatus() (*serverStatusResponse, error) {
+	req, err := web.NewHTTPRequestWithPath(t.Request, urlPathServerStatus)
+	if err != nil {
+		return nil, err
+	}
+
+	req.URL.RawQuery = urlQueryServerStatus
+
+	var status serverStatusResponse
+
+	if err := t.doOKDecode(req, &status); err != nil {
+		return nil, err
+	}
+
+	return &status, nil
+}
+
+func (t *Tomcat) doOKDecode(req *http.Request, in interface{}) error {
+	resp, err := t.httpClient.Do(req)
+	if err != nil {
+		return fmt.Errorf("error on HTTP request '%s': %v", req.URL, err)
+	}
+	defer closeBody(resp)
+
+	if resp.StatusCode != http.StatusOK {
+		return fmt.Errorf("'%s' returned HTTP status code: %d", req.URL, resp.StatusCode)
+	}
+
+	if err := xml.NewDecoder(resp.Body).Decode(in); err != nil {
+		return fmt.Errorf("error decoding XML response from '%s': %v", req.URL, err)
+	}
+
+	return nil
+}
+
+func closeBody(resp *http.Response) {
+	if resp != nil && resp.Body != nil {
+		_, _ = io.Copy(io.Discard, resp.Body)
+		_ = resp.Body.Close()
+	}
+}