129 lines
1.7 KiB
Go
129 lines
1.7 KiB
Go
package healthcheck
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import (
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"bytes"
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"context"
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"fmt"
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"io"
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"strings"
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"sync"
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)
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type (
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checkFn func(ctx context.Context) error
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Meta struct {
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Label string
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Description string
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}
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check struct {
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fn checkFn
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*Meta
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}
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result struct {
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err error
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*Meta
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}
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results []*result
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checks struct {
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l sync.RWMutex
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cc []*check
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}
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)
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var (
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defaults *checks
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)
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func init() {
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defaults = New()
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}
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func Defaults() *checks {
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return defaults
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}
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func New() *checks {
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return &checks{cc: []*check{}}
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}
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// Add appends new check
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func (c *checks) Add(fn checkFn, label string, description ...string) {
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c.l.Lock()
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defer c.l.Unlock()
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c.cc = append(c.cc, &check{fn, &Meta{Label: label, Description: strings.Join(description, "")}})
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}
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func (c *checks) Run(ctx context.Context) results {
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c.l.RLock()
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defer c.l.RUnlock()
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var rr = make([]*result, len(c.cc))
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for i, c := range c.cc {
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rr[i] = &result{c.fn(ctx), c.Meta}
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}
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return rr
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}
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func (rr results) Healthy() bool {
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for _, c := range rr {
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if c.err != nil {
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return false
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}
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}
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return true
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}
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func (rr results) String() string {
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buf := &bytes.Buffer{}
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rr.WriteTo(buf)
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return buf.String()
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}
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func (rr results) WriteTo(w io.Writer) (int64, error) {
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var (
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p = func(f string, aa ...interface{}) {
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_, _ = fmt.Fprintf(w, f, aa...)
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}
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)
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for _, r := range rr {
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if r.IsHealthy() {
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p("PASS")
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} else {
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p("FAIL")
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}
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p(" %s", r.Label)
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if !r.IsHealthy() {
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p(": %v", r.Error())
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}
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p("\n")
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}
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return 0, nil
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}
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func (r *result) IsHealthy() bool {
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return r != nil && r.err == nil
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}
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func (r *result) Error() string {
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if r == nil || r.err == nil {
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return ""
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}
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return r.err.Error()
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}
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