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package kcpserver
import (
"context"
"crypto/sha256"
"encoding/hex"
"errors"
"fmt"
"io"
"os"
"os/exec"
"path/filepath"
"regexp"
"strings"
"time"
"github.com/johnandersen777/socialweb-computer-kcp/internal/versions"
)
type RollMode string
const (
ModeBlueGreen RollMode = "blue-green"
ModePlannedOutage RollMode = "planned-outage"
)
var ErrIncompatiblePair = errors.New("kcpserver: no storage-compatible kcpCompat record for this pair of kcp releases")
type Asset struct {
Path string `json:"path"`
SHA256 string `json:"sha256"`
Version string `json:"version"`
}
var releaseRE = regexp.MustCompile(`kcp-(v[0-9]+\.[0-9]+\.[0-9]+[0-9A-Za-z.-]*)`)
func Release(version string) string {
if m := releaseRE.FindStringSubmatch(version); m != nil {
return m[1]
}
return ""
}
func ReadAsset(ctx context.Context, path string) (Asset, error) {
if !filepath.IsAbs(path) {
return Asset{}, fmt.Errorf("kcpserver: kcp executable %q must be an absolute path", path)
}
real, err := filepath.EvalSymlinks(path)
if err != nil {
return Asset{}, err
}
f, err := os.Open(real)
if err != nil {
return Asset{}, err
}
defer f.Close()
fi, err := f.Stat()
if err != nil || fi.IsDir() || fi.Mode()&0o111 == 0 {
return Asset{}, fmt.Errorf("kcpserver: %s is not an executable file", real)
}
h := sha256.New()
if _, err := io.Copy(h, f); err != nil {
return Asset{}, err
}
vctx, cancel := context.WithTimeout(ctx, 10*time.Second)
defer cancel()
out, _ := exec.CommandContext(vctx, real, "--version").CombinedOutput()
return Asset{Path: real, SHA256: hex.EncodeToString(h.Sum(nil)), Version: strings.TrimSpace(string(out))}, nil
}
type PairVerdict struct {
Mode RollMode `json:"mode"`
From string `json:"from"`
To string `json:"to"`
Reason string `json:"reason"`
Record *versions.KcpCompat `json:"record,omitempty"`
}
func CheckPair(from, to Asset, records []versions.KcpCompat, plannedOutage bool) (PairVerdict, error) {
v := PairVerdict{From: Release(from.Version), To: Release(to.Version)}
compatible := false
switch {
case from.SHA256 != "" && from.SHA256 == to.SHA256:
compatible, v.Reason = true, "same asset"
case v.From != "" && v.From == v.To:
compatible, v.Reason = true, "same kcp release "+v.From+", a rebuilt binary"
default:
for i := range records {
r := records[i]
if (r.From == v.From && r.To == v.To) || (r.From == v.To && r.To == v.From) {
v.Record = &r
compatible = r.StorageCompatible
v.Reason = fmt.Sprintf("kcpCompat %s -> %s storageCompatible=%t (diff sha256 %s)", r.From, r.To, r.StorageCompatible, r.DiffSHA256)
break
}
}
if v.Record == nil {
v.Reason = fmt.Sprintf("no kcpCompat record for %q -> %q", v.From, v.To)
}
}
if plannedOutage {
v.Mode = ModePlannedOutage
return v, nil
}
if !compatible {
return v, fmt.Errorf("%w: %s; the only path is --planned-outage (pg_dump, stop the old slot, start the new one on the same store)", ErrIncompatiblePair, v.Reason)
}
v.Mode = ModeBlueGreen
return v, nil
}
