/
config.go
238 lines (210 loc) · 5.99 KB
/
config.go
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package cmd
import (
"encoding/csv"
"fmt"
"io"
"strings"
"github.com/spf13/afero"
"github.com/aswinkarthik/csvdiff/pkg/digest"
)
// Context is to store all command line Flags.
type Context struct {
fs afero.Fs
primaryKeyPositions []int
valueColumnPositions []int
includeColumnPositions []int
format string
baseFilename string
deltaFilename string
baseFile afero.File
deltaFile afero.File
recordCount int
separator rune
lazyQuotes bool
}
// NewContext can take all CLI flags and create a cmd.Context
// Validations are done as part of this.
// File pointers are created too.
func NewContext(
fs afero.Fs,
primaryKeyPositions []int,
valueColumnPositions []int,
ignoreValueColumnPositions []int,
includeColumnPositions []int,
format string,
baseFilename string,
deltaFilename string,
separator rune,
lazyQuotes bool,
) (*Context, error) {
baseRecordCount, err := getColumnsCount(fs, baseFilename, separator, lazyQuotes)
if err != nil {
return nil, fmt.Errorf("error in base-file: %v", err)
}
deltaRecordCount, err := getColumnsCount(fs, deltaFilename, separator, lazyQuotes)
if err != nil {
return nil, fmt.Errorf("error in delta-file: %v", err)
}
if baseRecordCount != deltaRecordCount {
return nil, fmt.Errorf("base-file and delta-file columns count do not match")
}
if len(ignoreValueColumnPositions) > 0 && len(valueColumnPositions) > 0 {
return nil, fmt.Errorf("only one of --columns or --ignore-columns")
}
if len(ignoreValueColumnPositions) > 0 {
valueColumnPositions = inferValueColumns(baseRecordCount, ignoreValueColumnPositions)
}
baseFile, err := fs.Open(baseFilename)
if err != nil {
return nil, err
}
deltaFile, err := fs.Open(deltaFilename)
if err != nil {
return nil, err
}
ctx := &Context{
fs: fs,
primaryKeyPositions: primaryKeyPositions,
valueColumnPositions: valueColumnPositions,
includeColumnPositions: includeColumnPositions,
format: format,
baseFilename: baseFilename,
deltaFilename: deltaFilename,
baseFile: baseFile,
deltaFile: deltaFile,
recordCount: baseRecordCount,
separator: separator,
lazyQuotes: lazyQuotes,
}
if err := ctx.validate(); err != nil {
return nil, fmt.Errorf("validation failed: %v", err)
}
return ctx, nil
}
// GetPrimaryKeys is to return the --primary-key flags as digest.Positions array.
func (c *Context) GetPrimaryKeys() digest.Positions {
if len(c.primaryKeyPositions) > 0 {
return c.primaryKeyPositions
}
return []int{0}
}
// GetValueColumns is to return the --columns flags as digest.Positions array.
func (c *Context) GetValueColumns() digest.Positions {
if len(c.valueColumnPositions) > 0 {
return c.valueColumnPositions
}
return []int{}
}
// GetIncludeColumnPositions is to return the --include flags as digest.Positions array.
// If empty, it is value columns
func (c Context) GetIncludeColumnPositions() digest.Positions {
if len(c.includeColumnPositions) > 0 {
return c.includeColumnPositions
}
return c.GetValueColumns()
}
// validate validates the context object
// and returns error if not valid.
func (c *Context) validate() error {
{
// format validation
formatFound := false
for _, format := range allFormats {
if strings.ToLower(c.format) == format {
formatFound = true
}
}
if !formatFound {
return fmt.Errorf("specified format is not valid")
}
}
{
comparator := func(element int) bool {
return element < c.recordCount
}
if !assertAll(c.primaryKeyPositions, comparator) {
return fmt.Errorf("--primary-key positions are out of bounds")
}
if !assertAll(c.includeColumnPositions, comparator) {
return fmt.Errorf("--include positions are out of bounds")
}
if !assertAll(c.valueColumnPositions, comparator) {
return fmt.Errorf("--columns positions are out of bounds")
}
}
return nil
}
func inferValueColumns(recordCount int, ignoreValueColumns []int) digest.Positions {
lookupMap := make(map[int]struct{})
for _, pos := range ignoreValueColumns {
lookupMap[pos] = struct{}{}
}
valueColumns := make(digest.Positions, 0)
if len(ignoreValueColumns) > 0 {
for i := 0; i < recordCount; i++ {
if _, exists := lookupMap[i]; !exists {
valueColumns = append(valueColumns, i)
}
}
}
return valueColumns
}
func assertAll(elements []int, assertFn func(element int) bool) bool {
for _, el := range elements {
if !assertFn(el) {
return false
}
}
return true
}
func getColumnsCount(fs afero.Fs, filename string, separator rune, lazyQuotes bool) (int, error) {
base, err := fs.Open(filename)
if err != nil {
return 0, err
}
defer base.Close()
csvReader := csv.NewReader(base)
csvReader.Comma = separator
csvReader.LazyQuotes = lazyQuotes
record, err := csvReader.Read()
if err != nil {
if err == io.EOF {
return 0, fmt.Errorf("unable to process headers from csv file. EOF reached. invalid CSV file")
}
return 0, err
}
return len(record), nil
}
// BaseDigestConfig creates a digest.Context from cmd.Context
// that is needed to start the diff process
func (c *Context) BaseDigestConfig() (digest.Config, error) {
return digest.Config{
Reader: c.baseFile,
Value: c.valueColumnPositions,
Key: c.primaryKeyPositions,
Include: c.includeColumnPositions,
Separator: c.separator,
LazyQuotes: c.lazyQuotes,
}, nil
}
// DeltaDigestConfig creates a digest.Context from cmd.Context
// that is needed to start the diff process
func (c *Context) DeltaDigestConfig() (digest.Config, error) {
return digest.Config{
Reader: c.deltaFile,
Value: c.valueColumnPositions,
Key: c.primaryKeyPositions,
Include: c.includeColumnPositions,
Separator: c.separator,
LazyQuotes: c.lazyQuotes,
}, nil
}
// Close all file handles
func (c *Context) Close() {
if c.baseFile != nil {
_ = c.baseFile.Close()
}
if c.deltaFile != nil {
_ = c.deltaFile.Close()
}
}