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tailscale/health/state.go

94 lines
2.9 KiB
Go

// Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause
package health
import (
"time"
)
// State contains the health status of the backend, and is
// provided to the client UI via LocalAPI through ipn.Notify.
type State struct {
// Each key-value pair in Warnings represents a Warnable that is currently
// unhealthy. If a Warnable is healthy, it will not be present in this map.
// When a Warnable is unhealthy and becomes healthy, its key-value pair
// disappears in the next issued State. Observers should treat the absence of
// a WarnableCode in this map as an indication that the Warnable became healthy,
// and may use that to clear any notifications that were previously shown to the user.
// If Warnings is nil, all Warnables are healthy and the backend is overall healthy.
Warnings map[WarnableCode]UnhealthyState
}
// Representation contains information to be shown to the user to inform them
// that a Warnable is currently unhealthy.
type UnhealthyState struct {
WarnableCode WarnableCode
Severity Severity
Title string
Text string
BrokenSince *time.Time `json:",omitempty"`
Args Args `json:",omitempty"`
DependsOn []WarnableCode `json:",omitempty"`
}
// unhealthyState returns a unhealthyState of the Warnable given its current warningState.
func (w *Warnable) unhealthyState(ws *warningState) *UnhealthyState {
var text string
if ws.Args != nil {
text = w.Text(ws.Args)
} else {
text = w.Text(Args{})
}
dependsOnWarnableCodes := make([]WarnableCode, len(w.DependsOn), len(w.DependsOn)+1)
for i, d := range w.DependsOn {
dependsOnWarnableCodes[i] = d.Code
}
if w != warmingUpWarnable {
// Here we tell the frontend that all Warnables depend on warmingUpWarnable. GUIs will silence all warnings until all
// their dependencies are healthy. This is a special case to prevent the GUI from showing a bunch of warnings when
// the backend is still warming up.
dependsOnWarnableCodes = append(dependsOnWarnableCodes, warmingUpWarnable.Code)
}
return &UnhealthyState{
WarnableCode: w.Code,
Severity: w.Severity,
Title: w.Title,
Text: text,
BrokenSince: &ws.BrokenSince,
Args: ws.Args,
DependsOn: dependsOnWarnableCodes,
}
}
// CurrentState returns a snapshot of the current health status of the backend.
// It returns a State with nil Warnings if the backend is healthy (all Warnables
// have no issues).
// The returned State is a snapshot of shared memory, and the caller should not
// mutate the returned value.
func (t *Tracker) CurrentState() *State {
if t.nil() {
return &State{}
}
t.mu.Lock()
defer t.mu.Unlock()
if t.warnableVal == nil || len(t.warnableVal) == 0 {
return &State{}
}
wm := map[WarnableCode]UnhealthyState{}
for w, ws := range t.warnableVal {
wm[w.Code] = *w.unhealthyState(ws)
}
return &State{
Warnings: wm,
}
}