mirror of https://github.com/mikefarah/yq.git
620 lines
19 KiB
Go
620 lines
19 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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"os"
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"strconv"
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"github.com/mikefarah/yq/v3/pkg/yqlib"
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"github.com/mikefarah/yq/v3/pkg/yqlib/treeops"
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errors "github.com/pkg/errors"
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yaml "gopkg.in/yaml.v3"
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)
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type readDataFn func(document int, dataBucket *yaml.Node) ([]*treeops.CandidateNode, error)
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func createReadFunction(path string) func(int, *yaml.Node) ([]*treeops.CandidateNode, error) {
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return func(document int, dataBucket *yaml.Node) ([]*treeops.CandidateNode, error) {
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return lib.Get(document, dataBucket, path)
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}
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}
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func readYamlFile(filename string, path string, updateAll bool, docIndexInt int) ([]*treeops.CandidateNode, error) {
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return doReadYamlFile(filename, createReadFunction(path), updateAll, docIndexInt)
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}
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func doReadYamlFile(filename string, readFn readDataFn, updateAll bool, docIndexInt int) ([]*treeops.CandidateNode, error) {
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var matchingNodes []*treeops.CandidateNode
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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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} else if errorReading != nil {
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return errorReading
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}
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var errorParsing error
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matchingNodes, errorParsing = appendDocument(matchingNodes, dataBucket, readFn, updateAll, docIndexInt, currentIndex)
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if errorParsing != nil {
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return errorParsing
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}
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if !updateAll && currentIndex == docIndexInt {
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log.Debug("all done")
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return nil
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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 && docIndexInt != 0 {
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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 []*treeops.CandidateNode, dataBucket yaml.Node, readFn readDataFn, updateAll bool, docIndexInt int, currentIndex int) ([]*treeops.CandidateNode, 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 in document %v", currentIndex)
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matchingNodes, errorParsing := readFn(currentIndex, &dataBucket)
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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 lengthOf(node *yaml.Node) int {
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kindToCheck := node.Kind
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if node.Kind == yaml.DocumentNode && len(node.Content) == 1 {
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log.Debugf("length of document node, calculating length of child")
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kindToCheck = node.Content[0].Kind
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}
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switch kindToCheck {
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case yaml.ScalarNode:
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return len(node.Value)
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case yaml.MappingNode:
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return len(node.Content) / 2
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default:
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return len(node.Content)
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}
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}
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// transforms node before printing, if required
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func transformNode(node *yaml.Node) *yaml.Node {
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if printLength {
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return &yaml.Node{Kind: yaml.ScalarNode, Value: fmt.Sprintf("%v", lengthOf(node))}
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}
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return node
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}
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func printNode(node *yaml.Node, writer io.Writer) error {
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var encoder yqlib.Encoder
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if node.Kind == yaml.ScalarNode && unwrapScalar && !outputToJSON {
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return writeString(writer, node.Value+"\n")
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}
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if outputToJSON {
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encoder = yqlib.NewJsonEncoder(writer, prettyPrint, indent)
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} else {
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encoder = yqlib.NewYamlEncoder(writer, indent, colorsEnabled)
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}
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return encoder.Encode(node)
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}
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func removeComments(matchingNodes []*treeops.CandidateNode) {
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for _, nodeContext := range matchingNodes {
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removeCommentOfNode(nodeContext.Node)
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}
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}
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func removeCommentOfNode(node *yaml.Node) {
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node.HeadComment = ""
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node.LineComment = ""
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node.FootComment = ""
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for _, child := range node.Content {
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removeCommentOfNode(child)
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}
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}
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func setStyle(matchingNodes []*treeops.CandidateNode, style yaml.Style) {
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for _, nodeContext := range matchingNodes {
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updateStyleOfNode(nodeContext.Node, style)
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}
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}
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func updateStyleOfNode(node *yaml.Node, style yaml.Style) {
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node.Style = style
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for _, child := range node.Content {
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updateStyleOfNode(child, style)
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}
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}
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func writeString(writer io.Writer, txt string) error {
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_, errorWriting := writer.Write([]byte(txt))
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return errorWriting
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}
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func setIfNotThere(node *yaml.Node, key string, value *yaml.Node) {
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for index := 0; index < len(node.Content); index = index + 2 {
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keyNode := node.Content[index]
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if keyNode.Value == key {
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return
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}
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}
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// need to add it to the map
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mapEntryKey := yaml.Node{Value: key, Kind: yaml.ScalarNode}
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node.Content = append(node.Content, &mapEntryKey)
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node.Content = append(node.Content, value)
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}
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func applyAlias(node *yaml.Node, alias *yaml.Node) {
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if alias == nil {
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return
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}
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for index := 0; index < len(alias.Content); index = index + 2 {
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keyNode := alias.Content[index]
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log.Debugf("applying alias key %v", keyNode.Value)
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valueNode := alias.Content[index+1]
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setIfNotThere(node, keyNode.Value, valueNode)
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}
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}
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func explodeNode(node *yaml.Node) error {
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node.Anchor = ""
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switch node.Kind {
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case yaml.SequenceNode, yaml.DocumentNode:
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for index, contentNode := range node.Content {
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log.Debugf("exploding index %v", index)
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errorInContent := explodeNode(contentNode)
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if errorInContent != nil {
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return errorInContent
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}
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}
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return nil
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case yaml.AliasNode:
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log.Debugf("its an alias!")
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if node.Alias != nil {
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node.Kind = node.Alias.Kind
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node.Style = node.Alias.Style
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node.Tag = node.Alias.Tag
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node.Content = node.Alias.Content
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node.Value = node.Alias.Value
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node.Alias = nil
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}
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return nil
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case yaml.MappingNode:
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for index := 0; index < len(node.Content); index = index + 2 {
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keyNode := node.Content[index]
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valueNode := node.Content[index+1]
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log.Debugf("traversing %v", keyNode.Value)
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if keyNode.Value != "<<" {
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errorInContent := explodeNode(valueNode)
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if errorInContent != nil {
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return errorInContent
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}
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errorInContent = explodeNode(keyNode)
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if errorInContent != nil {
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return errorInContent
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}
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} else {
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if valueNode.Kind == yaml.SequenceNode {
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log.Debugf("an alias merge list!")
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for index := len(valueNode.Content) - 1; index >= 0; index = index - 1 {
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aliasNode := valueNode.Content[index]
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applyAlias(node, aliasNode.Alias)
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}
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} else {
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log.Debugf("an alias merge!")
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applyAlias(node, valueNode.Alias)
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}
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node.Content = append(node.Content[:index], node.Content[index+2:]...)
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//replay that index, since the array is shorter now.
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index = index - 2
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}
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}
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return nil
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default:
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return nil
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}
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}
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func explode(matchingNodes []*treeops.CandidateNode) error {
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log.Debug("exploding nodes")
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for _, nodeContext := range matchingNodes {
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log.Debugf("exploding %v", nodeContext.GetKey())
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errorExplodingNode := explodeNode(nodeContext.Node)
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if errorExplodingNode != nil {
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return errorExplodingNode
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}
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}
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return nil
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}
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func printResults(matchingNodes []*treeops.CandidateNode, writer io.Writer) error {
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if prettyPrint {
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setStyle(matchingNodes, 0)
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}
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if stripComments {
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removeComments(matchingNodes)
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}
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//always explode anchors when printing json
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if explodeAnchors || outputToJSON {
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errorExploding := explode(matchingNodes)
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if errorExploding != nil {
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return errorExploding
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}
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}
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bufferedWriter := bufio.NewWriter(writer)
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defer safelyFlush(bufferedWriter)
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if len(matchingNodes) == 0 {
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log.Debug("no matching results, nothing to print")
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if defaultValue != "" {
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return writeString(bufferedWriter, defaultValue)
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}
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return nil
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}
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var errorWriting error
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var arrayCollection = yaml.Node{Kind: yaml.SequenceNode}
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for _, mappedDoc := range matchingNodes {
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switch printMode {
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case "p":
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errorWriting = writeString(bufferedWriter, mappedDoc.PathStackToString()+"\n")
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if errorWriting != nil {
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return errorWriting
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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: mappedDoc.PathStackToString()}
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parentNode.Content[1] = transformNode(mappedDoc.Node)
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if collectIntoArray {
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arrayCollection.Content = append(arrayCollection.Content, &parentNode)
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} else if err := printNode(&parentNode, bufferedWriter); err != nil {
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return err
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}
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default:
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if collectIntoArray {
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arrayCollection.Content = append(arrayCollection.Content, mappedDoc.Node)
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} else if err := printNode(transformNode(mappedDoc.Node), bufferedWriter); err != nil {
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return err
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}
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}
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}
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if collectIntoArray {
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if err := printNode(transformNode(&arrayCollection), bufferedWriter); err != nil {
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return err
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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 isNullDocument(dataBucket *yaml.Node) bool {
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return dataBucket.Kind == yaml.DocumentNode && (len(dataBucket.Content) == 0 ||
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dataBucket.Content[0].Kind == yaml.ScalarNode && dataBucket.Content[0].Tag == "!!null")
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}
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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 && docIndexInt == 0 && currentIndex == 0 {
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//empty document, lets just make one
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dataBucket = yaml.Node{Kind: yaml.DocumentNode, Content: make([]*yaml.Node, 1)}
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child := yaml.Node{Kind: yaml.MappingNode}
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dataBucket.Content[0] = &child
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} else if isNullDocument(&dataBucket) && (updateAll || docIndexInt == currentIndex) {
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child := yaml.Node{Kind: yaml.MappingNode}
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dataBucket.Content[0] = &child
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} else 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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if prettyPrint {
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updateStyleOfNode(&dataBucket, 0)
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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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// var completedSuccessfully = false
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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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// // mkdir temp dir as some docker images does not have temp dir
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// _, err = os.Stat(os.TempDir())
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// if os.IsNotExist(err) {
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// err = os.Mkdir(os.TempDir(), 0700)
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// if err != nil {
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// return err
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// }
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// } else 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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// if completedSuccessfully {
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// safelyRenameFile(tempFile.Name(), inputFile)
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// }
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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, prettyPrint, indent)
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// } else {
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// encoder = yqlib.NewYamlEncoder(bufferedWriter, indent, colorsEnabled)
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// }
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// var errorProcessing = readStream(inputFile, mapYamlDecoder(updateData, encoder))
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// completedSuccessfully = errorProcessing == nil
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// return errorProcessing
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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, allowNoValue bool) ([]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 sourceYamlFile != "" && len(args) == expectedArgs-1 {
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// log.Debugf("Reading value from %v", sourceYamlFile)
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// var value yaml.Node
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// err := readData(sourceYamlFile, 0, &value)
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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.Debug("args %v", args[expectedArgs-2])
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// updateCommands = make([]yqlib.UpdateCommand, 1)
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// updateCommands[0] = yqlib.UpdateCommand{Command: "update", Path: args[expectedArgs-2], Value: value.Content[0], Overwrite: true}
|
|
// } else if len(args) == expectedArgs {
|
|
// updateCommands = make([]yqlib.UpdateCommand, 1)
|
|
// log.Debug("args %v", args)
|
|
// log.Debug("path %v", args[expectedArgs-2])
|
|
// log.Debug("Value %v", args[expectedArgs-1])
|
|
// value := valueParser.Parse(args[expectedArgs-1], customTag, customStyle, anchorName, makeAlias)
|
|
// updateCommands[0] = yqlib.UpdateCommand{Command: "update", Path: args[expectedArgs-2], Value: value, Overwrite: true, CommentsMergeStrategy: yqlib.IgnoreCommentsMergeStrategy}
|
|
// } else if len(args) == expectedArgs-1 && allowNoValue {
|
|
// // don't update the value
|
|
// updateCommands = make([]yqlib.UpdateCommand, 1)
|
|
// log.Debug("args %v", args)
|
|
// log.Debug("path %v", args[expectedArgs-2])
|
|
// updateCommands[0] = yqlib.UpdateCommand{Command: "update", Path: args[expectedArgs-2], Value: valueParser.Parse("", customTag, customStyle, anchorName, makeAlias), Overwrite: true, DontUpdateNodeValue: true}
|
|
// } else {
|
|
// return nil, errors.New(badArgsMessage)
|
|
// }
|
|
// return updateCommands, nil
|
|
// }
|
|
|
|
func safelyRenameFile(from string, to string) {
|
|
if renameError := os.Rename(from, to); renameError != nil {
|
|
log.Debugf("Error renaming from %v to %v, attempting to copy contents", from, to)
|
|
log.Debug(renameError.Error())
|
|
// can't do this rename when running in docker to a file targeted in a mounted volume,
|
|
// so gracefully degrade to copying the entire contents.
|
|
if copyError := copyFileContents(from, to); copyError != nil {
|
|
log.Errorf("Failed copying from %v to %v", from, to)
|
|
log.Error(copyError.Error())
|
|
} else {
|
|
removeErr := os.Remove(from)
|
|
if removeErr != nil {
|
|
log.Errorf("failed removing original file: %s", from)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// thanks https://stackoverflow.com/questions/21060945/simple-way-to-copy-a-file-in-golang
|
|
func copyFileContents(src, dst string) (err error) {
|
|
in, err := os.Open(src) // nolint gosec
|
|
if err != nil {
|
|
return err
|
|
}
|
|
defer safelyCloseFile(in)
|
|
out, err := os.Create(dst)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
defer safelyCloseFile(out)
|
|
if _, err = io.Copy(out, in); err != nil {
|
|
return err
|
|
}
|
|
return out.Sync()
|
|
}
|
|
|
|
func safelyFlush(writer *bufio.Writer) {
|
|
if err := writer.Flush(); err != nil {
|
|
log.Error("Error flushing writer!")
|
|
log.Error(err.Error())
|
|
}
|
|
|
|
}
|
|
func safelyCloseFile(file *os.File) {
|
|
err := file.Close()
|
|
if err != nil {
|
|
log.Error("Error closing file!")
|
|
log.Error(err.Error())
|
|
}
|
|
}
|
|
|
|
type yamlDecoderFn func(*yaml.Decoder) error
|
|
|
|
func readStream(filename string, yamlDecoder yamlDecoderFn) error {
|
|
if filename == "" {
|
|
return errors.New("Must provide filename")
|
|
}
|
|
|
|
var stream io.Reader
|
|
if filename == "-" {
|
|
stream = bufio.NewReader(os.Stdin)
|
|
} else {
|
|
file, err := os.Open(filename) // nolint gosec
|
|
if err != nil {
|
|
return err
|
|
}
|
|
defer safelyCloseFile(file)
|
|
stream = file
|
|
}
|
|
return yamlDecoder(yaml.NewDecoder(stream))
|
|
}
|
|
|
|
func readData(filename string, indexToRead int, parsedData interface{}) error {
|
|
return readStream(filename, func(decoder *yaml.Decoder) error {
|
|
for currentIndex := 0; currentIndex < indexToRead; currentIndex++ {
|
|
errorSkipping := decoder.Decode(parsedData)
|
|
if errorSkipping != nil {
|
|
return errors.Wrapf(errorSkipping, "Error processing document at index %v, %v", currentIndex, errorSkipping)
|
|
}
|
|
}
|
|
return decoder.Decode(parsedData)
|
|
})
|
|
}
|