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// SPDX-License-Identifier: GPL-3.0-or-later
package nginx
import (
"bufio"
"fmt"
"io"
"net/http"
"regexp"
"strconv"
"strings"
"github.com/netdata/netdata/go/go.d.plugin/pkg/web"
)
const (
connActive = "connActive"
connAccepts = "connAccepts"
connHandled = "connHandled"
requests = "requests"
requestTime = "requestTime"
connReading = "connReading"
connWriting = "connWriting"
connWaiting = "connWaiting"
)
var (
nginxSeq = []string{
connActive,
connAccepts,
connHandled,
requests,
connReading,
connWriting,
connWaiting,
}
tengineSeq = []string{
connActive,
connAccepts,
connHandled,
requests,
requestTime,
connReading,
connWriting,
connWaiting,
}
reStatus = regexp.MustCompile(`^Active connections: ([0-9]+)\n[^\d]+([0-9]+) ([0-9]+) ([0-9]+) ?([0-9]+)?\nReading: ([0-9]+) Writing: ([0-9]+) Waiting: ([0-9]+)`)
)
func newAPIClient(client *http.Client, request web.Request) *apiClient {
return &apiClient{httpClient: client, request: request}
}
type apiClient struct {
httpClient *http.Client
request web.Request
}
func (a apiClient) getStubStatus() (*stubStatus, error) {
req, err := web.NewHTTPRequest(a.request)
if err != nil {
return nil, fmt.Errorf("error on creating request : %v", err)
}
resp, err := a.doRequestOK(req)
defer closeBody(resp)
if err != nil {
return nil, err
}
status, err := parseStubStatus(resp.Body)
if err != nil {
return nil, fmt.Errorf("error on parsing response : %v", err)
}
return status, nil
}
func (a apiClient) doRequestOK(req *http.Request) (*http.Response, error) {
resp, err := a.httpClient.Do(req)
if err != nil {
return resp, fmt.Errorf("error on request : %v", err)
}
if resp.StatusCode != http.StatusOK {
return resp, fmt.Errorf("%s returned HTTP status %d", req.URL, resp.StatusCode)
}
return resp, err
}
func closeBody(resp *http.Response) {
if resp != nil && resp.Body != nil {
_, _ = io.Copy(io.Discard, resp.Body)
_ = resp.Body.Close()
}
}
func parseStubStatus(r io.Reader) (*stubStatus, error) {
sc := bufio.NewScanner(r)
var lines []string
for sc.Scan() {
lines = append(lines, strings.Trim(sc.Text(), "\r\n "))
}
parsed := reStatus.FindStringSubmatch(strings.Join(lines, "\n"))
if len(parsed) == 0 {
return nil, fmt.Errorf("can't parse '%v'", lines)
}
parsed = parsed[1:]
var (
seq []string
status stubStatus
)
switch len(parsed) {
default:
return nil, fmt.Errorf("invalid number of fields, got %d, expect %d or %d", len(parsed), len(nginxSeq), len(tengineSeq))
case len(nginxSeq):
seq = nginxSeq
case len(tengineSeq):
seq = tengineSeq
}
for i, key := range seq {
strValue := parsed[i]
if strValue == "" {
continue
}
value := mustParseInt(strValue)
switch key {
default:
return nil, fmt.Errorf("unknown key in seq : %s", key)
case connActive:
status.Connections.Active = value
case connAccepts:
status.Connections.Accepts = value
case connHandled:
status.Connections.Handled = value
case requests:
status.Requests.Total = value
case connReading:
status.Connections.Reading = value
case connWriting:
status.Connections.Writing = value
case connWaiting:
status.Connections.Waiting = value
case requestTime:
status.Requests.Time = &value
}
}
return &status, nil
}
func mustParseInt(value string) int64 {
v, err := strconv.ParseInt(value, 10, 64)
if err != nil {
panic(err)
}
return v
}
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