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sql.go
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sql.go
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package resources
import (
"context"
"database/sql"
"encoding/json"
"fmt"
"net/http"
"strconv"
"strings"
"time"
"github.com/canonical/lxd/lxd/db/query"
"github.com/canonical/lxd/lxd/response"
"github.com/canonical/microcluster/rest/access"
"github.com/canonical/microcluster/internal/rest/types"
"github.com/canonical/microcluster/internal/state"
"github.com/canonical/microcluster/rest"
)
var sqlCmd = rest.Endpoint{
Path: "sql",
Get: rest.EndpointAction{Handler: sqlGet, AccessHandler: access.AllowAuthenticated},
Post: rest.EndpointAction{Handler: sqlPost, AccessHandler: access.AllowAuthenticated},
}
// Perform a database dump.
func sqlGet(state *state.State, r *http.Request) response.Response {
parentCtx, cancel := context.WithTimeout(r.Context(), 30*time.Second)
defer cancel()
schemaOnly, err := strconv.Atoi(r.FormValue("schema"))
if err != nil {
schemaOnly = 0
}
var dump string
err = state.Database.Transaction(parentCtx, func(ctx context.Context, tx *sql.Tx) error {
dump, err = query.Dump(ctx, tx, schemaOnly == 1)
if err != nil {
return fmt.Errorf("Failed dump database: %w", err)
}
return nil
})
if err != nil {
return response.SmartError(err)
}
return response.SyncResponse(true, types.SQLDump{Text: dump})
}
// Execute queries.
func sqlPost(state *state.State, r *http.Request) response.Response {
parentCtx, cancel := context.WithTimeout(r.Context(), 30*time.Second)
defer cancel()
req := &types.SQLQuery{}
// Parse the request.
err := json.NewDecoder(r.Body).Decode(&req)
if err != nil {
return response.BadRequest(err)
}
if req.Query == "" {
return response.BadRequest(fmt.Errorf("No query provided"))
}
// TODO: Handle .sync query.
batch := types.SQLBatch{}
for _, query := range strings.Split(req.Query, ";") {
query = strings.TrimLeft(query, " ")
if query == "" {
continue
}
result := types.SQLResult{}
err = state.Database.Transaction(parentCtx, func(ctx context.Context, tx *sql.Tx) error {
if strings.HasPrefix(strings.ToUpper(query), "SELECT") {
err = sqlSelect(ctx, tx, query, &result)
} else {
err = sqlExec(ctx, tx, query, &result)
}
return err
})
if err != nil {
return response.SmartError(err)
}
batch.Results = append(batch.Results, result)
}
return response.SyncResponse(true, batch)
}
func sqlSelect(ctx context.Context, tx *sql.Tx, query string, result *types.SQLResult) error {
result.Type = "select"
rows, err := tx.QueryContext(ctx, query)
if err != nil {
return fmt.Errorf("Failed to execute query: %w", err)
}
defer rows.Close()
result.Columns, err = rows.Columns()
if err != nil {
return fmt.Errorf("Failed to fetch colume names: %w", err)
}
for rows.Next() {
row := make([]interface{}, len(result.Columns))
rowPointers := make([]interface{}, len(result.Columns))
for i := range row {
rowPointers[i] = &row[i]
}
err := rows.Scan(rowPointers...)
if err != nil {
return fmt.Errorf("Failed to scan row: %w", err)
}
for i, column := range row {
// Convert bytes to string. This is safe as
// long as we don't have any BLOB column type.
data, ok := column.([]byte)
if ok {
row[i] = string(data)
}
}
result.Rows = append(result.Rows, row)
}
err = rows.Err()
if err != nil {
return fmt.Errorf("Got a row error: %w", err)
}
return nil
}
func sqlExec(ctx context.Context, tx *sql.Tx, query string, result *types.SQLResult) error {
result.Type = "exec"
r, err := tx.ExecContext(ctx, query)
if err != nil {
return fmt.Errorf("Failed to exec query: %w", err)
}
result.RowsAffected, err = r.RowsAffected()
if err != nil {
return fmt.Errorf("Failed to fetch affected rows: %w", err)
}
return nil
}