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shell.go
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shell.go
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package shell
import (
"bytes"
"context"
"database/sql"
"encoding/json"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"strconv"
"strings"
"github.com/canonical/go-dqlite"
"github.com/canonical/go-dqlite/client"
"github.com/canonical/go-dqlite/driver"
)
// Shell can be used to implement interactive prompts for inspecting a dqlite
// database.
type Shell struct {
store client.NodeStore
dial client.DialFunc
db *sql.DB
format string
}
// New creates a new Shell connected to the given database.
func New(database string, store client.NodeStore, options ...Option) (*Shell, error) {
o := defaultOptions()
for _, option := range options {
option(o)
}
switch o.Format {
case formatTabular:
case formatJson:
default:
return nil, fmt.Errorf("unknown format %s", o.Format)
}
driver, err := driver.New(store, driver.WithDialFunc(o.Dial))
if err != nil {
return nil, err
}
sql.Register(o.DriverName, driver)
db, err := sql.Open(o.DriverName, database)
if err != nil {
return nil, err
}
shell := &Shell{
store: store,
dial: o.Dial,
db: db,
format: o.Format,
}
return shell, nil
}
// Process a single input line.
func (s *Shell) Process(ctx context.Context, line string) (string, error) {
switch line {
case ".cluster":
return s.processCluster(ctx, line)
case ".leader":
return s.processLeader(ctx, line)
}
if strings.HasPrefix(strings.ToLower(strings.TrimLeft(line, " ")), ".remove") {
return s.processRemove(ctx, line)
}
if strings.HasPrefix(strings.ToLower(strings.TrimLeft(line, " ")), ".describe") {
return s.processDescribe(ctx, line)
}
if strings.HasPrefix(strings.ToLower(strings.TrimLeft(line, " ")), ".weight") {
return s.processWeight(ctx, line)
}
if strings.HasPrefix(strings.ToLower(strings.TrimLeft(line, " ")), ".dump") {
return s.processDump(ctx, line)
}
if strings.HasPrefix(strings.ToLower(strings.TrimLeft(line, " ")), ".reconfigure") {
return s.processReconfigure(ctx, line)
}
if strings.HasPrefix(strings.ToUpper(strings.TrimLeft(line, " ")), "SELECT") {
return s.processSelect(ctx, line)
} else {
return "", s.processExec(ctx, line)
}
}
func (s *Shell) processCluster(ctx context.Context, line string) (string, error) {
cli, err := client.FindLeader(ctx, s.store, client.WithDialFunc(s.dial))
if err != nil {
return "", err
}
cluster, err := cli.Cluster(ctx)
if err != nil {
return "", err
}
result := ""
switch s.format {
case formatTabular:
for i, server := range cluster {
if i > 0 {
result += "\n"
}
result += fmt.Sprintf("%x|%s|%s", server.ID, server.Address, server.Role)
}
case formatJson:
data, err := json.Marshal(cluster)
if err != nil {
return "", err
}
var indented bytes.Buffer
json.Indent(&indented, data, "", "\t")
result = string(indented.Bytes())
}
return result, nil
}
func (s *Shell) processLeader(ctx context.Context, line string) (string, error) {
cli, err := client.FindLeader(ctx, s.store, client.WithDialFunc(s.dial))
if err != nil {
return "", err
}
leader, err := cli.Leader(ctx)
if err != nil {
return "", err
}
if leader == nil {
return "", nil
}
return leader.Address, nil
}
func (s *Shell) processRemove(ctx context.Context, line string) (string, error) {
parts := strings.Split(line, " ")
if len(parts) != 2 {
return "", fmt.Errorf("bad command format, should be: .remove <address>")
}
address := parts[1]
cli, err := client.FindLeader(ctx, s.store, client.WithDialFunc(s.dial))
if err != nil {
return "", err
}
cluster, err := cli.Cluster(ctx)
if err != nil {
return "", err
}
for _, node := range cluster {
if node.Address != address {
continue
}
if err := cli.Remove(ctx, node.ID); err != nil {
return "", fmt.Errorf("remove node %q: %w", address, err)
}
return "", nil
}
return "", fmt.Errorf("no node has address %q", address)
}
func (s *Shell) processDescribe(ctx context.Context, line string) (string, error) {
parts := strings.Split(line, " ")
if len(parts) != 2 {
return "", fmt.Errorf("bad command format, should be: .describe <address>")
}
address := parts[1]
cli, err := client.New(ctx, address, client.WithDialFunc(s.dial))
if err != nil {
return "", err
}
metadata, err := cli.Describe(ctx)
if err != nil {
return "", err
}
result := ""
switch s.format {
case formatTabular:
result += fmt.Sprintf("%s|%d|%d", address, metadata.FailureDomain, metadata.Weight)
case formatJson:
data, err := json.Marshal(metadata)
if err != nil {
return "", err
}
var indented bytes.Buffer
json.Indent(&indented, data, "", "\t")
result = string(indented.Bytes())
}
return result, nil
}
func (s *Shell) processDump(ctx context.Context, line string) (string, error) {
parts := strings.Split(line, " ")
if len(parts) < 2 || len(parts) > 3 {
return "NOK", fmt.Errorf("bad command format, should be: .dump <address> [<database>]")
}
address := parts[1]
cli, err := client.New(ctx, address, client.WithDialFunc(s.dial))
if err != nil {
return "NOK", fmt.Errorf("dial failed")
}
database := "db.bin"
if len(parts) == 3 {
database = parts[2]
}
files, err := cli.Dump(ctx, database)
if err != nil {
return "NOK", fmt.Errorf("dump failed")
}
dir, err := os.Getwd()
if err != nil {
return "NOK", fmt.Errorf("os.Getwd() failed")
}
for _, file := range files {
path := filepath.Join(dir, file.Name)
err := ioutil.WriteFile(path, file.Data, 0600)
if err != nil {
return "NOK", fmt.Errorf("WriteFile failed on path %s", path)
}
}
return "OK", nil
}
func (s *Shell) processReconfigure(ctx context.Context, line string) (string, error) {
parts := strings.Split(line, " ")
if len(parts) != 3 {
return "NOK", fmt.Errorf("bad command format, should be: .reconfigure <dir> <clusteryaml>\n" +
"Args:\n" +
"\tdir - Directory of node with up to date data\n" +
"\tclusteryaml - Path to a .yaml file containing the desired cluster configuration\n\n" +
"Help:\n" +
"\tUse this command when trying to preserve the data from your cluster while changing the\n" +
"\tconfiguration of the cluster because e.g. your cluster is broken due to unreachablee nodes.\n" +
"\t0. BACKUP ALL YOUR NODE DATA DIRECTORIES BEFORE PROCEEDING!\n" +
"\t1. Stop all dqlite nodes.\n" +
"\t2. Identify the dir of the node with the most up to date raft term and log, this will be the <dir> argument.\n" +
"\t3. Create a .yaml file with the same format as cluster.yaml (or use/adapt an existing cluster.yaml) with the\n " +
"\t desired cluster configuration. This will be the <clusteryaml> argument.\n" +
"\t Don't forget to make sure the ID's in the file line up with the ID's in the info.yaml files.\n" +
"\t4. Run the .reconfigure <dir> <clusteryaml> command, it should return \"OK\".\n" +
"\t5. Copy the snapshot-xxx-xxx-xxx, snapshot-xxx-xxx-xxx.meta, segment files (00000xxxxx-000000xxxxx), desired cluster.yaml\n" +
"\t from <dir> over to the directories of the other nodes identified in <clusteryaml>, deleting any leftover snapshot-xxx-xxx-xxx, snapshot-xxx-xxx-xxx.meta,\n" +
"\t segment (00000xxxxx-000000xxxxx, open-xxx) and metadata{1,2} files that it contains.\n" +
"\t Make sure an info.yaml is also present that is in line with cluster.yaml.\n" +
"\t6. Start all the dqlite nodes.\n" +
"\t7. If, for some reason, this fails or gives undesired results, try again with data from another node (you should still have this from step 0).\n")
}
dir := parts[1]
clusteryamlpath := parts[2]
store, err := client.NewYamlNodeStore(clusteryamlpath)
if err != nil {
return "NOK", fmt.Errorf("Failed to create YamlNodeStore from file at %s :%v", clusteryamlpath, err)
}
servers, err := store.Get(ctx)
if err != nil {
return "NOK", fmt.Errorf("Failed to retrieve NodeInfo list :%v", err)
}
err = dqlite.ReconfigureMembershipExt(dir, servers)
if err != nil {
return "NOK", fmt.Errorf("Failed to reconfigure membership :%v.", err)
}
return "OK", nil
}
func (s *Shell) processWeight(ctx context.Context, line string) (string, error) {
parts := strings.Split(line, " ")
if len(parts) != 3 {
return "", fmt.Errorf("bad command format, should be: .weight <address> <n>")
}
address := parts[1]
weight, err := strconv.Atoi(parts[2])
if err != nil || weight < 0 {
return "", fmt.Errorf("bad weight %q", parts[2])
}
cli, err := client.New(ctx, address, client.WithDialFunc(s.dial))
if err != nil {
return "", err
}
if err := cli.Weight(ctx, uint64(weight)); err != nil {
return "", err
}
return "", nil
}
func (s *Shell) processSelect(ctx context.Context, line string) (string, error) {
tx, err := s.db.BeginTx(ctx, nil)
if err != nil {
return "", fmt.Errorf("begin transaction: %w", err)
}
rows, err := tx.Query(line)
if err != nil {
return "", fmt.Errorf("query: %w", err)
}
defer rows.Close()
columns, err := rows.Columns()
if err != nil {
return "", fmt.Errorf("columns: %w", err)
}
n := len(columns)
var sb strings.Builder
for rows.Next() {
row := make([]interface{}, n)
rowPointers := make([]interface{}, n)
for i := range row {
rowPointers[i] = &row[i]
}
if err := rows.Scan(rowPointers...); err != nil {
return "", fmt.Errorf("scan: %w", err)
}
for i, column := range row {
if i == 0 {
fmt.Fprintf(&sb, "%v", column)
} else {
fmt.Fprintf(&sb, "|%v", column)
}
}
sb.WriteByte('\n')
}
if err := rows.Err(); err != nil {
return "", fmt.Errorf("rows: %w", err)
}
if err := tx.Commit(); err != nil {
return "", fmt.Errorf("commit: %w", err)
}
return strings.TrimRight(sb.String(), "\n"), nil
}
func (s *Shell) processExec(ctx context.Context, line string) error {
tx, err := s.db.BeginTx(ctx, nil)
if err != nil {
return err
}
if _, err := tx.Exec(line); err != nil {
return err
}
if err := tx.Commit(); err != nil {
return err
}
return nil
}