|
| 1 | +package lint |
| 2 | + |
| 3 | +import ( |
| 4 | + "fmt" |
| 5 | + "os" |
| 6 | + "strings" |
| 7 | + |
| 8 | + "github.com/hashicorp/go-multierror" |
| 9 | + "github.com/pkg/errors" |
| 10 | + |
| 11 | + config "github.com/breml/logstash-config" |
| 12 | + "github.com/breml/logstash-config/ast" |
| 13 | + "github.com/breml/logstash-config/ast/astutil" |
| 14 | + "github.com/breml/logstash-config/internal/format" |
| 15 | +) |
| 16 | + |
| 17 | +type Lint struct { |
| 18 | + autoFixID bool |
| 19 | +} |
| 20 | + |
| 21 | +func New(autoFixID bool) Lint { |
| 22 | + return Lint{ |
| 23 | + autoFixID: autoFixID, |
| 24 | + } |
| 25 | +} |
| 26 | + |
| 27 | +func (l Lint) Run(args []string) error { |
| 28 | + var result *multierror.Error |
| 29 | + |
| 30 | + for _, filename := range args { |
| 31 | + stat, err := os.Stat(filename) |
| 32 | + if err != nil { |
| 33 | + result = multierror.Append(result, errors.Errorf("%s: %v", filename, err)) |
| 34 | + } |
| 35 | + if stat.IsDir() { |
| 36 | + continue |
| 37 | + } |
| 38 | + |
| 39 | + c, err := config.ParseFile(filename, config.ExceptionalCommentsWarning(true)) |
| 40 | + if err != nil { |
| 41 | + if errMsg, hasErr := config.GetFarthestFailure(); hasErr { |
| 42 | + if !strings.Contains(err.Error(), errMsg) { |
| 43 | + err = errors.Errorf("%s: %v\n%s", filename, err, errMsg) |
| 44 | + } |
| 45 | + } |
| 46 | + result = multierror.Append(result, errors.Errorf("%s: %v", filename, err)) |
| 47 | + continue |
| 48 | + } |
| 49 | + conf := c.(ast.Config) |
| 50 | + for _, warning := range conf.Warnings { |
| 51 | + result = multierror.Append(result, errors.New(warning)) |
| 52 | + } |
| 53 | + |
| 54 | + v := validator{ |
| 55 | + autoFixID: l.autoFixID, |
| 56 | + } |
| 57 | + |
| 58 | + for i := range conf.Input { |
| 59 | + astutil.ApplyPlugins(conf.Input[i].BranchOrPlugins, v.walk) |
| 60 | + } |
| 61 | + for i := range conf.Filter { |
| 62 | + astutil.ApplyPlugins(conf.Filter[i].BranchOrPlugins, v.walk) |
| 63 | + } |
| 64 | + for i := range conf.Output { |
| 65 | + astutil.ApplyPlugins(conf.Output[i].BranchOrPlugins, v.walk) |
| 66 | + } |
| 67 | + |
| 68 | + if len(v.noIDs) > 0 { |
| 69 | + errMsg := strings.Builder{} |
| 70 | + errMsg.WriteString(fmt.Sprintf("%s: no IDs found for:\n", filename)) |
| 71 | + for _, block := range v.noIDs { |
| 72 | + errMsg.WriteString(block + "\n") |
| 73 | + } |
| 74 | + result = multierror.Append(result, errors.New(errMsg.String())) |
| 75 | + } |
| 76 | + |
| 77 | + if l.autoFixID && v.changed { |
| 78 | + func() { |
| 79 | + f, err := os.Create(filename) |
| 80 | + if err != nil { |
| 81 | + result = multierror.Append(result, errors.Wrap(err, "failed to open file for writting with automatically fixed ID")) |
| 82 | + return |
| 83 | + } |
| 84 | + defer f.Close() |
| 85 | + |
| 86 | + _, err = f.WriteString(conf.String()) |
| 87 | + if err != nil { |
| 88 | + result = multierror.Append(result, errors.Wrap(err, "failed to write file with automatically fixed ID")) |
| 89 | + return |
| 90 | + } |
| 91 | + }() |
| 92 | + } |
| 93 | + } |
| 94 | + |
| 95 | + if result != nil { |
| 96 | + result.ErrorFormat = format.MultiErr |
| 97 | + return result |
| 98 | + } |
| 99 | + |
| 100 | + return nil |
| 101 | +} |
| 102 | + |
| 103 | +type validator struct { |
| 104 | + count int |
| 105 | + noIDs []string |
| 106 | + autoFixID bool |
| 107 | + changed bool |
| 108 | +} |
| 109 | + |
| 110 | +func (v *validator) walk(c *astutil.Cursor) { |
| 111 | + v.count++ |
| 112 | + |
| 113 | + _, err := c.Plugin().ID() |
| 114 | + if err != nil { |
| 115 | + if v.autoFixID { |
| 116 | + v.changed = true |
| 117 | + |
| 118 | + plugin := c.Plugin() |
| 119 | + plugin.Attributes = append(plugin.Attributes, ast.NewStringAttribute("id", fmt.Sprintf("%s-%d", c.Plugin().Name(), v.count), ast.DoubleQuoted)) |
| 120 | + |
| 121 | + c.Replace(plugin) |
| 122 | + } else { |
| 123 | + v.noIDs = append(v.noIDs, fmt.Sprintf("%s: %s", c.Plugin().Pos().String(), c.Plugin().Name())) |
| 124 | + } |
| 125 | + } |
| 126 | +} |
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