|
| 1 | +package internal |
| 2 | + |
| 3 | +import ( |
| 4 | + "bufio" |
| 5 | + "encoding/json" |
| 6 | + "errors" |
| 7 | + "fmt" |
| 8 | + "go/build" |
| 9 | + "io" |
| 10 | + "os" |
| 11 | + "path" |
| 12 | + "path/filepath" |
| 13 | + "strings" |
| 14 | + |
| 15 | + "github.com/myshkin5/moqueries/generator" |
| 16 | + "github.com/myshkin5/moqueries/logs" |
| 17 | +) |
| 18 | + |
| 19 | +var ( |
| 20 | + // ErrBadAppendRequest is returned when a caller passes bad parameters to |
| 21 | + // Append |
| 22 | + ErrBadAppendRequest = errors.New("bad request") |
| 23 | + // ErrBulkState is returned when the bulk state is invalid |
| 24 | + ErrBulkState = errors.New("bulk state error") |
| 25 | +) |
| 26 | + |
| 27 | +//go:generate moqueries OpenFileFn |
| 28 | + |
| 29 | +// OpenFileFn is the function type of os.OpenFile |
| 30 | +type OpenFileFn func(name string, flag int, perm os.FileMode) (ReadWriteSeekCloser, error) |
| 31 | + |
| 32 | +//go:generate moqueries ReadWriteSeekCloser |
| 33 | + |
| 34 | +// ReadWriteSeekCloser is the interface that groups the basic Read, Write, |
| 35 | +// Seek and Close methods. |
| 36 | +type ReadWriteSeekCloser interface { |
| 37 | + io.Reader |
| 38 | + io.Writer |
| 39 | + io.Seeker |
| 40 | + io.Closer |
| 41 | +} |
| 42 | + |
| 43 | +// Append appends a mock generate request to the bulk state |
| 44 | +func Append(stateFile string, req generator.GenerateRequest, openFileFn OpenFileFn) error { |
| 45 | + if !path.IsAbs(req.WorkingDir) { |
| 46 | + return fmt.Errorf("%w: the request working directory must be absolute: %s", |
| 47 | + ErrBadAppendRequest, req.WorkingDir) |
| 48 | + } |
| 49 | + |
| 50 | + f, err := openFileFn(stateFile, os.O_RDWR|os.O_APPEND, 0) |
| 51 | + if err != nil { |
| 52 | + return fmt.Errorf("error opening state file: %w", err) |
| 53 | + } |
| 54 | + defer func() { |
| 55 | + err := f.Close() |
| 56 | + if err != nil { |
| 57 | + logs.Error("error closing state file", err) |
| 58 | + } |
| 59 | + }() |
| 60 | + |
| 61 | + _, err = verifyState(f, stateFile, req.WorkingDir, false) |
| 62 | + if err != nil { |
| 63 | + return err |
| 64 | + } |
| 65 | + |
| 66 | + err = appendRequest(f, stateFile, req) |
| 67 | + if err != nil { |
| 68 | + return err |
| 69 | + } |
| 70 | + |
| 71 | + return nil |
| 72 | +} |
| 73 | + |
| 74 | +func verifyState(f io.ReadCloser, stateFile, workingDir string, rootDirOnly bool) (*bufio.Scanner, error) { |
| 75 | + scanner := bufio.NewScanner(f) |
| 76 | + if !scanner.Scan() { |
| 77 | + return nil, fmt.Errorf("%w: state file %s not initialized properly", |
| 78 | + ErrBulkState, stateFile) |
| 79 | + } |
| 80 | + |
| 81 | + txt := scanner.Text() |
| 82 | + err := scanner.Err() |
| 83 | + if err != nil { |
| 84 | + return nil, fmt.Errorf("error reading state file %s: %w", stateFile, err) |
| 85 | + } |
| 86 | + |
| 87 | + var state initialState |
| 88 | + err = json.Unmarshal([]byte(txt), &state) |
| 89 | + if err != nil { |
| 90 | + return nil, fmt.Errorf("error unmarshalling state file %s: %w", stateFile, err) |
| 91 | + } |
| 92 | + |
| 93 | + if state.GoPath != build.Default.GOPATH { |
| 94 | + return nil, fmt.Errorf("%w: current GOPATH doesn't match GOPATH from state file %s (%s != %s)", |
| 95 | + ErrBulkState, stateFile, build.Default.GOPATH, state.GoPath) |
| 96 | + } |
| 97 | + |
| 98 | + if rootDirOnly { |
| 99 | + if state.RootDir != workingDir { |
| 100 | + return nil, fmt.Errorf("%w: finalize root directory %s does"+ |
| 101 | + " not match root directory %s from state file %s", |
| 102 | + ErrBulkState, workingDir, state.RootDir, stateFile) |
| 103 | + } |
| 104 | + } else { |
| 105 | + rel, err := filepath.Rel(state.RootDir, workingDir) |
| 106 | + if err != nil { |
| 107 | + logs.Panicf("error getting relative path %s from %s: %#v", |
| 108 | + state.RootDir, workingDir, err) |
| 109 | + } |
| 110 | + |
| 111 | + if strings.HasPrefix(rel, "..") { |
| 112 | + return nil, fmt.Errorf("%w: working directory %s is not a"+ |
| 113 | + " child of root directory %s from state file %s", |
| 114 | + ErrBulkState, workingDir, state.RootDir, stateFile) |
| 115 | + } |
| 116 | + } |
| 117 | + |
| 118 | + return scanner, nil |
| 119 | +} |
| 120 | + |
| 121 | +func appendRequest(f ReadWriteSeekCloser, stateFile string, req generator.GenerateRequest) error { |
| 122 | + _, err := f.Seek(0, io.SeekEnd) |
| 123 | + if err != nil { |
| 124 | + return fmt.Errorf("error seeking end of state file %s: %w", stateFile, err) |
| 125 | + } |
| 126 | + _, err = f.Write(compact(req)) |
| 127 | + if err != nil { |
| 128 | + return fmt.Errorf("error writing state file %s: %w", stateFile, err) |
| 129 | + } |
| 130 | + _, err = f.Write([]byte("\n")) |
| 131 | + if err != nil { |
| 132 | + return fmt.Errorf("error finishing writing of state file %s: %w", stateFile, err) |
| 133 | + } |
| 134 | + return nil |
| 135 | +} |
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