| 1 | // SPDX-License-Identifier: GPL-3.0-or-later |
| 2 | |
| 3 | package supervisord |
| 4 | |
| 5 | import ( |
| 6 | "context" |
| 7 | "errors" |
| 8 | "fmt" |
| 9 | "net" |
| 10 | "net/http" |
| 11 | "net/url" |
| 12 | "strings" |
| 13 | |
| 14 | "github.com/mattn/go-xmlrpc" |
| 15 | ) |
| 16 | |
| 17 | type supervisorClient interface { |
| 18 | getAllProcessInfo() ([]processStatus, error) |
| 19 | closeIdleConnections() |
| 20 | } |
| 21 | |
| 22 | type supervisorRPCClient struct { |
| 23 | client *xmlrpc.Client |
| 24 | } |
| 25 | |
| 26 | func newSupervisorRPCClient(serverURL *url.URL, httpClient *http.Client) (supervisorClient, error) { |
| 27 | switch serverURL.Scheme { |
| 28 | case "http", "https": |
| 29 | c := xmlrpc.NewClient(serverURL.String()) |
| 30 | c.HttpClient = httpClient |
| 31 | return &supervisorRPCClient{client: c}, nil |
| 32 | case "unix": |
| 33 | c := xmlrpc.NewClient("http://unix/RPC2") |
| 34 | t, ok := httpClient.Transport.(*http.Transport) |
| 35 | if !ok { |
| 36 | return nil, errors.New("unexpected HTTPConfig client transport") |
| 37 | } |
| 38 | t.DialContext = func(ctx context.Context, _, _ string) (net.Conn, error) { |
| 39 | d := net.Dialer{Timeout: httpClient.Timeout} |
| 40 | return d.DialContext(ctx, "unix", serverURL.Path) |
| 41 | } |
| 42 | c.HttpClient = httpClient |
| 43 | return &supervisorRPCClient{client: c}, nil |
| 44 | default: |
| 45 | return nil, fmt.Errorf("unexpected URL scheme: %s", serverURL) |
| 46 | } |
| 47 | } |
| 48 | |
| 49 | // http://supervisord.org/api.html#process-control |
| 50 | type processStatus struct { |
| 51 | name string // name of the process. |
| 52 | group string // name of the process’ group. |
| 53 | start int // UNIX timestamp of when the process was started. |
| 54 | stop int // UNIX timestamp of when the process last ended, or 0 if the process has never been stopped. |
| 55 | now int // UNIX timestamp of the current time, which can be used to calculate process up-time. |
| 56 | state int // state code. |
| 57 | stateName string // string description of state. |
| 58 | exitStatus int // exit status (errorlevel) of process, or 0 if the process is still running. |
| 59 | } |
| 60 | |
| 61 | func (c *supervisorRPCClient) getAllProcessInfo() ([]processStatus, error) { |
| 62 | const fn = "supervisor.getAllProcessInfo" |
| 63 | resp, err := c.client.Call(fn) |
| 64 | if err != nil { |
| 65 | return nil, fmt.Errorf("error on '%s' function call: %v", fn, err) |
| 66 | } |
| 67 | return parseGetAllProcessInfo(resp) |
| 68 | } |
| 69 | |
| 70 | func (c *supervisorRPCClient) closeIdleConnections() { |
| 71 | c.client.HttpClient.CloseIdleConnections() |
| 72 | } |
| 73 | |
| 74 | func parseGetAllProcessInfo(resp any) ([]processStatus, error) { |
| 75 | arr, ok := resp.(xmlrpc.Array) |
| 76 | if !ok { |
| 77 | return nil, fmt.Errorf("unexpected response type, want=xmlrpc.Array, got=%T", resp) |
| 78 | } |
| 79 | |
| 80 | var info []processStatus |
| 81 | |
| 82 | for _, item := range arr { |
| 83 | s, ok := item.(xmlrpc.Struct) |
| 84 | if !ok { |
| 85 | continue |
| 86 | } |
| 87 | |
| 88 | var p processStatus |
| 89 | for k, v := range s { |
| 90 | switch strings.ToLower(k) { |
| 91 | case "name": |
| 92 | p.name, _ = v.(string) |
| 93 | case "group": |
| 94 | p.group, _ = v.(string) |
| 95 | case "start": |
| 96 | p.start, _ = v.(int) |
| 97 | case "stop": |
| 98 | p.stop, _ = v.(int) |
| 99 | case "now": |
| 100 | p.now, _ = v.(int) |
| 101 | case "state": |
| 102 | p.state, _ = v.(int) |
| 103 | case "statename": |
| 104 | p.stateName, _ = v.(string) |
| 105 | case "exitstatus": |
| 106 | p.exitStatus, _ = v.(int) |
| 107 | } |
| 108 | } |
| 109 | if p.name != "" && p.group != "" && p.stateName != "" { |
| 110 | info = append(info, p) |
| 111 | } |
| 112 | } |
| 113 | return info, nil |
| 114 | } |