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caddy: Add InstanceID() method

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Caddy can now generate and persist its own instance ID, a UUID that is stored in
the data directory.

This makes it possible to differentiate it from other instances in a cluster.
This commit is contained in:
Matthew Holt 2021-03-30 14:15:20 -06:00
parent f35a7fa466
commit aac1ccf12d
No known key found for this signature in database
GPG key ID: 2A349DD577D586A5
3 changed files with 24 additions and 1 deletions
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21
caddy.go
View file

@ -33,6 +33,7 @@ import (
"time"
"github.com/caddyserver/certmagic"
"github.com/google/uuid"
"go.uber.org/zap"
)
@ -662,6 +663,26 @@ func ParseDuration(s string) (time.Duration, error) {
return time.ParseDuration(s)
}
// InstanceID returns the UUID for this instance, and generates one if it
// does not already exist. The UUID is stored in the local data directory,
// regardless of storage configuration, since each instance is intended to
// have its own unique ID.
func InstanceID() (uuid.UUID, error) {
uuidFilePath := filepath.Join(AppDataDir(), "instance.uuid")
uuidFileBytes, err := os.ReadFile(uuidFilePath)
if os.IsNotExist(err) {
uuid, err := uuid.NewRandom()
if err != nil {
return uuid, err
}
err = ioutil.WriteFile(uuidFilePath, []byte(uuid.String()), 0644)
return uuid, err
} else if err != nil {
return [16]byte{}, err
}
return uuid.ParseBytes(uuidFileBytes)
}
// GoModule returns the build info of this Caddy
// build from debug.BuildInfo (requires Go modules).
// If no version information is available, a non-nil

1
go.mod
View file

@ -10,6 +10,7 @@ require (
github.com/dustin/go-humanize v1.0.1-0.20200219035652-afde56e7acac
github.com/go-chi/chi v4.1.2+incompatible
github.com/google/cel-go v0.6.0
github.com/google/uuid v1.2.0
github.com/klauspost/compress v1.11.3
github.com/klauspost/cpuid/v2 v2.0.1
github.com/lucas-clemente/quic-go v0.19.3

3
go.sum
View file

@ -304,8 +304,9 @@ github.com/google/renameio v0.1.0/go.mod h1:KWCgfxg9yswjAJkECMjeO8J8rahYeXnNhOm4
github.com/google/trillian v1.2.2-0.20190612132142-05461f4df60a/go.mod h1:YPmUVn5NGwgnDUgqlVyFGMTgaWlnSvH7W5p+NdOG8UA=
github.com/google/trillian-examples v0.0.0-20190603134952-4e75ba15216c/go.mod h1:WgL3XZ3pA8/9cm7yxqWrZE6iZkESB2ItGxy5Fo6k2lk=
github.com/google/uuid v1.0.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
github.com/google/uuid v1.1.1 h1:Gkbcsh/GbpXz7lPftLA3P6TYMwjCLYm83jiFQZF/3gY=
github.com/google/uuid v1.1.1/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
github.com/google/uuid v1.2.0 h1:qJYtXnJRWmpe7m/3XlyhrsLrEURqHRM2kxzoxXqyUDs=
github.com/google/uuid v1.2.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
github.com/googleapis/gax-go v2.0.0+incompatible h1:j0GKcs05QVmm7yesiZq2+9cxHkNK9YM6zKx4D2qucQU=
github.com/googleapis/gax-go v2.0.0+incompatible/go.mod h1:SFVmujtThgffbyetf+mdk2eWhX2bMyUtNHzFKcPA9HY=
github.com/googleapis/gax-go/v2 v2.0.3/go.mod h1:LLvjysVCY1JZeum8Z6l8qUty8fiNwE08qbEPm1M08qg=