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/*---------------------------------------------------------------------------------------------
* Copyright (c) Microsoft Corporation. All rights reserved.
*--------------------------------------------------------------------------------------------*/
package copilot
import (
"errors"
"os"
"time"
"github.com/github/copilot-sdk/go/rpc"
)
// SessionFsProvider is the interface that SDK users implement to provide
// a session filesystem. Methods use idiomatic Go error handling: return an
// error for failures (the adapter maps os.ErrNotExist → ENOENT automatically).
//
// To add SQLite support, also implement [SessionFsSqliteProvider] on the same type.
type SessionFsProvider interface {
// ReadFile reads the full content of a file. Return os.ErrNotExist (or wrap it)
// if the file does not exist.
ReadFile(path string) (string, error)
// WriteFile writes content to a file, creating it and parent directories if needed.
// mode is an optional POSIX-style permission mode. Pass nil to use the OS default.
WriteFile(path string, content string, mode *int) error
// AppendFile appends content to a file, creating it and parent directories if needed.
// mode is an optional POSIX-style permission mode. Pass nil to use the OS default.
AppendFile(path string, content string, mode *int) error
// Exists checks whether the given path exists.
Exists(path string) (bool, error)
// Stat returns metadata about a file or directory.
// Return os.ErrNotExist if the path does not exist.
Stat(path string) (*SessionFsFileInfo, error)
// Mkdir creates a directory. If recursive is true, create parent directories as needed.
// mode is an optional POSIX-style permission mode (e.g., 0o755). Pass nil to use the OS default.
MakeDirectory(path string, recursive bool, mode *int) error
// Readdir lists the names of entries in a directory.
// Return os.ErrNotExist if the directory does not exist.
ReadDirectory(path string) ([]string, error)
// ReaddirWithTypes lists entries with type information.
// Return os.ErrNotExist if the directory does not exist.
ReadDirectoryWithTypes(path string) ([]rpc.SessionFsReaddirWithTypesEntry, error)
// Rm removes a file or directory. If recursive is true, remove contents too.
// If force is true, do not return an error when the path does not exist.
Remove(path string, recursive bool, force bool) error
// Rename moves/renames a file or directory.
Rename(src string, dest string) error
}
// SessionFsSqliteProvider is an optional interface that a [SessionFsProvider]
// may also implement to support per-session SQLite databases. The adapter
// checks for this interface at runtime using a type assertion. If the
// provider does not implement it, SQLite requests return an "unsupported" error.
//
// Providers are already session-scoped (created per session by the factory),
// so these methods do not take a session ID parameter.
type SessionFsSqliteProvider interface {
// SqliteQuery executes a SQLite query against the provider's per-session database.
SqliteQuery(queryType rpc.SessionFsSqliteQueryType, query string, params map[string]any) (*SessionFsSqliteQueryResult, error)
// SqliteExists checks whether the provider has a SQLite database for the session.
SqliteExists() (bool, error)
}
// SessionFsSqliteQueryResult holds the result of a SQLite query execution.
// Same shape as the generated RPC type but without the Error field,
// since providers signal errors by returning a Go error.
type SessionFsSqliteQueryResult struct {
Columns []string `json:"columns"`
Rows []map[string]any `json:"rows"`
RowsAffected int64 `json:"rowsAffected"`
LastInsertRowid *int64 `json:"lastInsertRowid,omitempty"`
}
// SessionFsFileInfo holds file metadata returned by SessionFsProvider.Stat.
type SessionFsFileInfo struct {
IsFile bool
IsDirectory bool
Size int64
Mtime time.Time
Birthtime time.Time
}
// sessionFsAdapter wraps a SessionFsProvider to implement rpc.SessionFsHandler,
// converting idiomatic Go errors into SessionFsError results.
type sessionFsAdapter struct {
provider SessionFsProvider
}
func newSessionFsAdapter(provider SessionFsProvider) rpc.SessionFsHandler {
return &sessionFsAdapter{provider: provider}
}
func (a *sessionFsAdapter) ReadFile(request *rpc.SessionFsReadFileRequest) (*rpc.SessionFsReadFileResult, error) {
content, err := a.provider.ReadFile(request.Path)
if err != nil {
return &rpc.SessionFsReadFileResult{Error: toSessionFsError(err)}, nil
}
return &rpc.SessionFsReadFileResult{Content: content}, nil
}
func (a *sessionFsAdapter) WriteFile(request *rpc.SessionFsWriteFileRequest) (*rpc.SessionFsError, error) {
var mode *int
if request.Mode != nil {
m := int(*request.Mode)
mode = &m
}
if err := a.provider.WriteFile(request.Path, request.Content, mode); err != nil {
return toSessionFsError(err), nil
}
return nil, nil
}
func (a *sessionFsAdapter) AppendFile(request *rpc.SessionFsAppendFileRequest) (*rpc.SessionFsError, error) {
var mode *int
if request.Mode != nil {
m := int(*request.Mode)
mode = &m
}
if err := a.provider.AppendFile(request.Path, request.Content, mode); err != nil {
return toSessionFsError(err), nil
}
return nil, nil
}
func (a *sessionFsAdapter) Exists(request *rpc.SessionFsExistsRequest) (*rpc.SessionFsExistsResult, error) {
exists, err := a.provider.Exists(request.Path)
if err != nil {
return &rpc.SessionFsExistsResult{Exists: false}, nil
}
return &rpc.SessionFsExistsResult{Exists: exists}, nil
}
func (a *sessionFsAdapter) Stat(request *rpc.SessionFsStatRequest) (*rpc.SessionFsStatResult, error) {
info, err := a.provider.Stat(request.Path)
if err != nil {
return &rpc.SessionFsStatResult{Error: toSessionFsError(err)}, nil
}
return &rpc.SessionFsStatResult{
IsFile: info.IsFile,
IsDirectory: info.IsDirectory,
Size: info.Size,
Mtime: info.Mtime,
Birthtime: info.Birthtime,
}, nil
}
func (a *sessionFsAdapter) Mkdir(request *rpc.SessionFsMkdirRequest) (*rpc.SessionFsError, error) {
recursive := request.Recursive != nil && *request.Recursive
var mode *int
if request.Mode != nil {
m := int(*request.Mode)
mode = &m
}
if err := a.provider.MakeDirectory(request.Path, recursive, mode); err != nil {
return toSessionFsError(err), nil
}
return nil, nil
}
func (a *sessionFsAdapter) Readdir(request *rpc.SessionFsReaddirRequest) (*rpc.SessionFsReaddirResult, error) {
entries, err := a.provider.ReadDirectory(request.Path)
if err != nil {
return &rpc.SessionFsReaddirResult{Error: toSessionFsError(err)}, nil
}
return &rpc.SessionFsReaddirResult{Entries: entries}, nil
}
func (a *sessionFsAdapter) ReaddirWithTypes(request *rpc.SessionFsReaddirWithTypesRequest) (*rpc.SessionFsReaddirWithTypesResult, error) {
entries, err := a.provider.ReadDirectoryWithTypes(request.Path)
if err != nil {
return &rpc.SessionFsReaddirWithTypesResult{Error: toSessionFsError(err)}, nil
}
return &rpc.SessionFsReaddirWithTypesResult{Entries: entries}, nil
}
func (a *sessionFsAdapter) Rm(request *rpc.SessionFsRmRequest) (*rpc.SessionFsError, error) {
recursive := request.Recursive != nil && *request.Recursive
force := request.Force != nil && *request.Force
if err := a.provider.Remove(request.Path, recursive, force); err != nil {
return toSessionFsError(err), nil
}
return nil, nil
}
func (a *sessionFsAdapter) Rename(request *rpc.SessionFsRenameRequest) (*rpc.SessionFsError, error) {
if err := a.provider.Rename(request.Src, request.Dest); err != nil {
return toSessionFsError(err), nil
}
return nil, nil
}
func (a *sessionFsAdapter) SqliteQuery(request *rpc.SessionFsSqliteQueryRequest) (*rpc.SessionFsSqliteQueryResult, error) {
sp, ok := a.provider.(SessionFsSqliteProvider)
if !ok {
msg := "SQLite is not supported by this session filesystem provider"
return &rpc.SessionFsSqliteQueryResult{
Columns: []string{},
Rows: []map[string]any{},
RowsAffected: 0,
Error: &rpc.SessionFsError{Code: rpc.SessionFsErrorCodeUNKNOWN, Message: &msg},
}, nil
}
result, err := sp.SqliteQuery(request.QueryType, request.Query, request.Params)
if err != nil {
return &rpc.SessionFsSqliteQueryResult{
Columns: []string{},
Rows: []map[string]any{},
RowsAffected: 0,
Error: toSessionFsError(err),
}, nil
}
if result == nil {
return &rpc.SessionFsSqliteQueryResult{
Columns: []string{},
Rows: []map[string]any{},
RowsAffected: 0,
}, nil
}
var wireRowid *int64
if result.LastInsertRowid != nil {
rowid := *result.LastInsertRowid
wireRowid = &rowid
}
return &rpc.SessionFsSqliteQueryResult{
Columns: result.Columns,
Rows: result.Rows,
RowsAffected: result.RowsAffected,
LastInsertRowid: wireRowid,
}, nil
}
func (a *sessionFsAdapter) SqliteExists(request *rpc.SessionFsSqliteExistsRequest) (*rpc.SessionFsSqliteExistsResult, error) {
sp, ok := a.provider.(SessionFsSqliteProvider)
if !ok {
return &rpc.SessionFsSqliteExistsResult{Exists: false}, nil
}
exists, err := sp.SqliteExists()
if err != nil {
return &rpc.SessionFsSqliteExistsResult{Exists: false}, nil
}
return &rpc.SessionFsSqliteExistsResult{Exists: exists}, nil
}
func toSessionFsError(err error) *rpc.SessionFsError {
code := rpc.SessionFsErrorCodeUNKNOWN
if errors.Is(err, os.ErrNotExist) {
code = rpc.SessionFsErrorCodeENOENT
}
msg := err.Error()
return &rpc.SessionFsError{Code: code, Message: &msg}
}