-
Notifications
You must be signed in to change notification settings - Fork 51
/
api_health.go
91 lines (78 loc) · 2.76 KB
/
api_health.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
// Copyright (c) 2022 Canonical Ltd
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License version 3 as
// published by the Free Software Foundation.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package daemon
import (
"encoding/json"
"net/http"
"github.com/canonical/x-go/strutil"
"github.com/canonical/pebble/internals/logger"
"github.com/canonical/pebble/internals/overlord/checkstate"
"github.com/canonical/pebble/internals/plan"
)
type healthInfo struct {
Healthy bool `json:"healthy"`
}
func v1Health(c *Command, r *http.Request, _ *UserState) Response {
query := r.URL.Query()
level := plan.CheckLevel(query.Get("level"))
switch level {
case plan.UnsetLevel, plan.AliveLevel, plan.ReadyLevel:
default:
return statusBadRequest(`level must be "alive" or "ready"`)
}
names := strutil.MultiCommaSeparatedList(query["names"])
checks, err := getChecks(c.d.overlord)
if err != nil {
logger.Noticef("Cannot fetch checks: %v", err.Error())
return statusInternalError("internal server error")
}
healthy := true
status := http.StatusOK
for _, check := range checks {
levelMatch := level == plan.UnsetLevel || level == check.Level ||
level == plan.ReadyLevel && check.Level == plan.AliveLevel // ready implies alive
namesMatch := len(names) == 0 || strutil.ListContains(names, check.Name)
if levelMatch && namesMatch && check.Status != checkstate.CheckStatusUp {
healthy = false
status = http.StatusBadGateway
}
}
return SyncResponse(&healthResp{
Type: ResponseTypeSync,
Status: status,
StatusText: http.StatusText(status),
Result: healthInfo{Healthy: healthy},
})
}
// Like the resp struct, but without the warning/maintenance fields, so that
// the health endpoint doesn't have to acquire the state lock (resulting in a
// slow response on heavily-loaded systems).
type healthResp struct {
Type ResponseType `json:"type"`
Status int `json:"status-code"`
StatusText string `json:"status,omitempty"`
Result interface{} `json:"result,omitempty"`
}
func (r *healthResp) ServeHTTP(w http.ResponseWriter, _ *http.Request) {
status := r.Status
bs, err := json.Marshal(r)
if err != nil {
logger.Noticef("Cannot marshal %#v to JSON: %v", *r, err)
bs = nil
status = http.StatusInternalServerError
}
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(status)
w.Write(bs)
}