mirror of https://github.com/mikefarah/yq.git
374 lines
11 KiB
Go
374 lines
11 KiB
Go
package cmd
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import (
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"bufio"
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"fmt"
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"io"
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"io/ioutil"
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"os"
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"strconv"
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"github.com/mikefarah/yq/v3/pkg/yqlib"
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errors "github.com/pkg/errors"
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"github.com/spf13/cobra"
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yaml "gopkg.in/yaml.v3"
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)
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func readYamlFile(filename string, path string, updateAll bool, docIndexInt int) ([]*yqlib.NodeContext, error) {
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var matchingNodes []*yqlib.NodeContext
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var currentIndex = 0
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var errorReadingStream = readStream(filename, func(decoder *yaml.Decoder) error {
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for {
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var dataBucket yaml.Node
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errorReading := decoder.Decode(&dataBucket)
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if errorReading == io.EOF {
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return handleEOF(updateAll, docIndexInt, currentIndex)
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}
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var errorParsing error
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matchingNodes, errorParsing = appendDocument(matchingNodes, dataBucket, path, updateAll, docIndexInt, currentIndex)
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if errorParsing != nil {
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return errorParsing
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}
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currentIndex = currentIndex + 1
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}
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})
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return matchingNodes, errorReadingStream
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}
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func handleEOF(updateAll bool, docIndexInt int, currentIndex int) error {
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log.Debugf("done %v / %v", currentIndex, docIndexInt)
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if !updateAll && currentIndex <= docIndexInt {
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return fmt.Errorf("Could not process document index %v as there are only %v document(s)", docIndex, currentIndex)
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}
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return nil
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}
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func appendDocument(originalMatchingNodes []*yqlib.NodeContext, dataBucket yaml.Node, path string, updateAll bool, docIndexInt int, currentIndex int) ([]*yqlib.NodeContext, error) {
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log.Debugf("processing document %v - requested index %v", currentIndex, docIndexInt)
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yqlib.DebugNode(&dataBucket)
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if !updateAll && currentIndex != docIndexInt {
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return originalMatchingNodes, nil
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}
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log.Debugf("reading %v in document %v", path, currentIndex)
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matchingNodes, errorParsing := lib.Get(&dataBucket, path)
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if errorParsing != nil {
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return nil, errors.Wrapf(errorParsing, "Error reading path in document index %v", currentIndex)
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}
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return append(originalMatchingNodes, matchingNodes...), nil
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}
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func printValue(node *yaml.Node, cmd *cobra.Command) error {
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if node.Kind == yaml.ScalarNode {
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cmd.Print(node.Value)
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return nil
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}
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bufferedWriter := bufio.NewWriter(cmd.OutOrStdout())
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defer safelyFlush(bufferedWriter)
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var encoder yqlib.Encoder
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if outputToJSON {
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encoder = yqlib.NewJsonEncoder(bufferedWriter)
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} else {
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encoder = yqlib.NewYamlEncoder(bufferedWriter)
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}
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if err := encoder.Encode(node); err != nil {
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return err
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}
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return nil
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}
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func printResults(matchingNodes []*yqlib.NodeContext, cmd *cobra.Command) error {
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if len(matchingNodes) == 0 {
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log.Debug("no matching results, nothing to print")
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return nil
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}
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for index, mappedDoc := range matchingNodes {
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switch printMode {
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case "p":
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cmd.Print(lib.PathStackToString(mappedDoc.PathStack))
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if index < len(matchingNodes)-1 {
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cmd.Print("\n")
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}
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case "pv", "vp":
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// put it into a node and print that.
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var parentNode = yaml.Node{Kind: yaml.MappingNode}
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parentNode.Content = make([]*yaml.Node, 2)
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parentNode.Content[0] = &yaml.Node{Kind: yaml.ScalarNode, Value: lib.PathStackToString(mappedDoc.PathStack)}
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parentNode.Content[1] = mappedDoc.Node
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if err := printValue(&parentNode, cmd); err != nil {
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return err
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}
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default:
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if err := printValue(mappedDoc.Node, cmd); err != nil {
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return err
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}
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// Printing our Scalars does not print a new line at the end
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// we only want to do that if there are more values (so users can easily script extraction of values in the yaml)
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if index < len(matchingNodes)-1 && mappedDoc.Node.Kind == yaml.ScalarNode {
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cmd.Print("\n")
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}
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}
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}
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return nil
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}
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func parseDocumentIndex() (bool, int, error) {
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if docIndex == "*" {
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return true, -1, nil
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}
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docIndexInt64, err := strconv.ParseInt(docIndex, 10, 32)
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if err != nil {
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return false, -1, errors.Wrapf(err, "Document index %v is not a integer or *", docIndex)
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}
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return false, int(docIndexInt64), nil
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}
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type updateDataFn func(dataBucket *yaml.Node, currentIndex int) error
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func mapYamlDecoder(updateData updateDataFn, encoder yqlib.Encoder) yamlDecoderFn {
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return func(decoder *yaml.Decoder) error {
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var dataBucket yaml.Node
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var errorReading error
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var errorWriting error
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var errorUpdating error
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var currentIndex = 0
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var updateAll, docIndexInt, errorParsingDocIndex = parseDocumentIndex()
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if errorParsingDocIndex != nil {
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return errorParsingDocIndex
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}
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for {
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log.Debugf("Read doc %v", currentIndex)
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errorReading = decoder.Decode(&dataBucket)
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if errorReading == io.EOF {
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if !updateAll && currentIndex <= docIndexInt {
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return fmt.Errorf("asked to process document index %v but there are only %v document(s)", docIndex, currentIndex)
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}
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return nil
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} else if errorReading != nil {
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return errors.Wrapf(errorReading, "Error reading document at index %v, %v", currentIndex, errorReading)
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}
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errorUpdating = updateData(&dataBucket, currentIndex)
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if errorUpdating != nil {
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return errors.Wrapf(errorUpdating, "Error updating document at index %v", currentIndex)
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}
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errorWriting = encoder.Encode(&dataBucket)
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if errorWriting != nil {
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return errors.Wrapf(errorWriting, "Error writing document at index %v, %v", currentIndex, errorWriting)
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}
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currentIndex = currentIndex + 1
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}
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}
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}
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func prefixDocument(updateAll bool, docIndexInt int, currentIndex int, dataBucket *yaml.Node, updateCommand yqlib.UpdateCommand) error {
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if updateAll || currentIndex == docIndexInt {
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log.Debugf("Prefixing document %v", currentIndex)
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yqlib.DebugNode(dataBucket)
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updateCommand.Value = dataBucket.Content[0]
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dataBucket.Content = make([]*yaml.Node, 1)
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newNode := lib.New(updateCommand.Path)
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dataBucket.Content[0] = &newNode
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errorUpdating := lib.Update(dataBucket, updateCommand, true)
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if errorUpdating != nil {
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return errorUpdating
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}
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}
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return nil
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}
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func updateDoc(inputFile string, updateCommands []yqlib.UpdateCommand, writer io.Writer) error {
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var updateAll, docIndexInt, errorParsingDocIndex = parseDocumentIndex()
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if errorParsingDocIndex != nil {
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return errorParsingDocIndex
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}
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var updateData = func(dataBucket *yaml.Node, currentIndex int) error {
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if updateAll || currentIndex == docIndexInt {
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log.Debugf("Updating doc %v", currentIndex)
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for _, updateCommand := range updateCommands {
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log.Debugf("Processing update to Path %v", updateCommand.Path)
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errorUpdating := lib.Update(dataBucket, updateCommand, autoCreateFlag)
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if errorUpdating != nil {
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return errorUpdating
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}
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}
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}
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return nil
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}
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return readAndUpdate(writer, inputFile, updateData)
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}
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func readAndUpdate(stdOut io.Writer, inputFile string, updateData updateDataFn) error {
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var destination io.Writer
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var destinationName string
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if writeInplace {
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info, err := os.Stat(inputFile)
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if err != nil {
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return err
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}
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tempFile, err := ioutil.TempFile("", "temp")
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if err != nil {
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return err
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}
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destinationName = tempFile.Name()
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err = os.Chmod(destinationName, info.Mode())
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if err != nil {
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return err
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}
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destination = tempFile
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defer func() {
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safelyCloseFile(tempFile)
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safelyRenameFile(tempFile.Name(), inputFile)
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}()
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} else {
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destination = stdOut
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destinationName = "Stdout"
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}
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log.Debugf("Writing to %v from %v", destinationName, inputFile)
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bufferedWriter := bufio.NewWriter(destination)
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defer safelyFlush(bufferedWriter)
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var encoder yqlib.Encoder
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if outputToJSON {
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encoder = yqlib.NewJsonEncoder(bufferedWriter)
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} else {
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encoder = yqlib.NewYamlEncoder(bufferedWriter)
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}
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return readStream(inputFile, mapYamlDecoder(updateData, encoder))
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}
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type updateCommandParsed struct {
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Command string
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Path string
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Value yaml.Node
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}
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func readUpdateCommands(args []string, expectedArgs int, badArgsMessage string) ([]yqlib.UpdateCommand, error) {
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var updateCommands []yqlib.UpdateCommand = make([]yqlib.UpdateCommand, 0)
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if writeScript != "" {
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var parsedCommands = make([]updateCommandParsed, 0)
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err := readData(writeScript, 0, &parsedCommands)
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if err != nil && err != io.EOF {
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return nil, err
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}
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log.Debugf("Read write commands file '%v'", parsedCommands)
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for index := range parsedCommands {
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parsedCommand := parsedCommands[index]
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updateCommand := yqlib.UpdateCommand{Command: parsedCommand.Command, Path: parsedCommand.Path, Value: &parsedCommand.Value, Overwrite: true}
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updateCommands = append(updateCommands, updateCommand)
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}
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log.Debugf("Read write commands file '%v'", updateCommands)
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} else if len(args) < expectedArgs {
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return nil, errors.New(badArgsMessage)
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} else {
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updateCommands = make([]yqlib.UpdateCommand, 1)
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log.Debug("args %v", args)
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log.Debug("path %v", args[expectedArgs-2])
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log.Debug("Value %v", args[expectedArgs-1])
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updateCommands[0] = yqlib.UpdateCommand{Command: "update", Path: args[expectedArgs-2], Value: valueParser.Parse(args[expectedArgs-1], customTag), Overwrite: true}
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}
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return updateCommands, nil
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}
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func safelyRenameFile(from string, to string) {
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if renameError := os.Rename(from, to); renameError != nil {
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log.Debugf("Error renaming from %v to %v, attempting to copy contents", from, to)
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log.Debug(renameError.Error())
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// can't do this rename when running in docker to a file targeted in a mounted volume,
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// so gracefully degrade to copying the entire contents.
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if copyError := copyFileContents(from, to); copyError != nil {
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log.Errorf("Failed copying from %v to %v", from, to)
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log.Error(copyError.Error())
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} else {
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removeErr := os.Remove(from)
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if removeErr != nil {
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log.Errorf("failed removing original file: %s", from)
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}
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}
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}
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}
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// thanks https://stackoverflow.com/questions/21060945/simple-way-to-copy-a-file-in-golang
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func copyFileContents(src, dst string) (err error) {
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in, err := os.Open(src) // nolint gosec
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if err != nil {
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return err
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}
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defer safelyCloseFile(in)
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out, err := os.Create(dst)
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if err != nil {
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return err
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}
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defer safelyCloseFile(out)
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if _, err = io.Copy(out, in); err != nil {
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return err
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}
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return out.Sync()
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}
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func safelyFlush(writer *bufio.Writer) {
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if err := writer.Flush(); err != nil {
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log.Error("Error flushing writer!")
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log.Error(err.Error())
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}
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}
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func safelyCloseFile(file *os.File) {
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err := file.Close()
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if err != nil {
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log.Error("Error closing file!")
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log.Error(err.Error())
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}
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}
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type yamlDecoderFn func(*yaml.Decoder) error
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func readStream(filename string, yamlDecoder yamlDecoderFn) error {
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if filename == "" {
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return errors.New("Must provide filename")
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}
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var stream io.Reader
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if filename == "-" {
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stream = bufio.NewReader(os.Stdin)
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} else {
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file, err := os.Open(filename) // nolint gosec
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if err != nil {
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return err
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}
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defer safelyCloseFile(file)
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stream = file
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}
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return yamlDecoder(yaml.NewDecoder(stream))
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}
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func readData(filename string, indexToRead int, parsedData interface{}) error {
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return readStream(filename, func(decoder *yaml.Decoder) error {
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for currentIndex := 0; currentIndex < indexToRead; currentIndex++ {
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errorSkipping := decoder.Decode(parsedData)
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if errorSkipping != nil {
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return errors.Wrapf(errorSkipping, "Error processing document at index %v, %v", currentIndex, errorSkipping)
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}
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}
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return decoder.Decode(parsedData)
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})
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}
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