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mus-stream-go

mus-stream-go is a streaming version of mus-go. It completely repeats the structure of mus-go, and differs only in that it uses Writer, Reader interfaces rather than а slice of bytes.

Tests

Test coverage is 100%.

How To Use

You can learn more about this in the mus-go documentation. Here is just a small example.

mus-stream-go is able to skip invalid data from the byte stream:

package main

import (
  "bytes"
  "errors"
  "fmt"

  com "github.com/mus-format/common-go"
  "github.com/mus-format/mus-stream-go/ord"
)

func main() {
  var (
    str1                              = "hello"
    str2                              = "very long string" // Invalid string.
    str3                              = "world"
    // String length validator.
    maxLength com.ValidatorFn[int] = func(length int) error {
      if length > 5 {
        return errors.New("too long")
      }
      return nil
    }
    size = ord.SizeString(str1) + ord.SizeString(str2) + ord.SizeString(str3)
    bs   = make([]byte, 0, size)
    buf  = bytes.NewBuffer(bs) // Create a Writer/Reader.
  )

  // Fill the buffer.
  ord.MarshalString(str1, buf)
  ord.MarshalString(str2, buf)
  ord.MarshalString(str3, buf)

  var (
    skip = true // The invalid string will be skipped. If false, the Unmarshal 
    // function will immediately return a validation error.
    str  string
    err  error
  )
  for i := 0; i < 3; i++ {
    str, _, err = ord.UnmarshalValidString(maxLength, skip, buf)
    if err == nil {
      fmt.Println(str)
    } else {
      // Only the length of the invalid string will be deserialized, the rest of
      // its bytes will be simply skipped, and after that the Unmarshal
      // function will return a validation error.			
      fmt.Printf("validation error - \"%v\"\n", err)
    }
  }
  // The output will be:
  // hello
  // validation error - "too long"
  // world
}

This trick can be performed not only with strings, but also with slice, map or struct data types.

Another thing to note is that if we want to use a real connection instead of bytes.Buffer, we will have, for example, to use the bufio package. This is because the bufio.Writer and bufio.Reader implement the muss.Writer and muss.Reader interfaces we need.

Data Type Metadata (DTM) Support

mus-stream-dts-go provides DTM support.

Data Versioning Support

mus-stream-dvs-go provides data versioning support.

Marshal/Unmarshal interfaces (or oneof feature)

Go to the mus-go documentation