goutil

func AllowedMethodHandler ¶

func AllowedMethodHandler(h http.Handler, methods ...string) http.Handler

AllowedMethodHandler restricts http requests to methods provided.

func CompareObjects ¶

func CompareObjects(t1, t2 interface{}, tid string) (ss [][]string, err error)

CompareObjects compares the field count, order, names, and values of two structs objects. If the field count or order is different, the structs are not comparable and the function returns an error. If the structs differ only in field values, the function returns a list of differences. Fields can be renamed using tags (tid) and omitted with a tag value of '-'.

func ErrorDecorator ¶

func ErrorDecorator(err error) error

ErrorDecorator prepends function filename, line number, and function name to error messages.

func MkdirOpen ¶

func MkdirOpen(fn string) (*os.File, error)

func ObjecToSlice ¶

func ObjecToSlice(t interface{}, tid string) (ss [][]string, err error)

ObjecToSlice converts a single-tier struct into a slice of slices in the form {{name, value}, {name, value}, ...} for consumption by other methods. The outer slice maintains the fields in the same order as the struct. The tag parameter is the name of the struct tag to use for special processing. The primary purpose of this function is to offload tag processing for other functions.

func ObjectDbCols ¶

func ObjectDbCols(t interface{}, tid string) (cols []string, err error)

ObjectDbCols is a convenience method that returns relevant and valid database column names for use in constructing SQL statements. Only columns representing fields that will not cause a panic are included. Columns are further filtered by the tag provided. To be included, the tag must exist and must not have a '-' value.

func ObjectDbSQL ¶

func ObjectDbSQL(cmd, tbl string, cols []string) (sql string, err error)

ObjectDbSQL generates basic SQL statements from struct fields.

func ObjectDbVals ¶

func ObjectDbVals(t interface{}, tid string) (vals []interface{}, err error)

ObjectDbVals is a convenience method that returns an entire database row for simpler insert statements. Only fields that will not cause a panic are included. Fields are further filtered by the tag provided. To be included, the tag must exist and must not have a '-' value. The table or view DDL must have the same columns with the same names in the same order or the query will fail. Can be combined with the method ObjectDbCols for a less brittle solution.

func ObjectDbValsByCol ¶

func ObjectDbValsByCol(t interface{}, tid string, cols []string) (vals []interface{}, err error)

ObjectDbValsByCol is a convenience method that returns a database row based on the column names provided by the caller, which are ostensibly taken from the database table or view. The column names are matched to the tag on the struct field. An error is returned if a column is not found or if the associated field returns false for the IsValid(), CanAddr(), or CanInterface() reflect methods.

func ObjectToCSV ¶

func ObjectToCSV(t interface{}) (b []byte, err error)

ObjectToCSV converts a single-tier struct to a string suitable for writing to a CSV file. For the csv package, we need to rearranage the elements from an ordered list of {{name, value}, {name, value}, ...} to an ordered list of {{name, name, ...}, {value, value, ...}}.

func ObjectToNVP ¶

func ObjectToNVP(t interface{}) (b []byte, err error)

ObjectToNVP converts a single-tier struct to a string containing name- value pairs separated by newlines.

func RestoreObject ¶

func RestoreObject(fn string, t interface{}) (err error)

RestoreObject restores an object from a JSON file.

func RowToMap ¶

func RowToMap(vid, pid, sn string, rows *sql.Rows) (mss map[string]string, err error)

RowToMap converts a database row into a map of string values indexed by column name.

func SaveObject ¶

func SaveObject(t interface{}, fn string) (err error)

SaveObject persists an object to a JSON file.