add the support for the parse of basic redis module type

Signed-off-by: liyaojie <lyj199907@outlook.com>

internal/rdb/structure/module2_struct.go

@@ -0,0 +1,71 @@
+package structure
+
+import (
+	"fmt"
+	"io"
+	"log"
+	"strconv"
+)
+
+const (
+	rdbModuleOpcodeEOF    = 0 // End of module value.
+	rdbModuleOpcodeSINT   = 1 // Signed integer.
+	rdbModuleOpcodeUINT   = 2 // Unsigned integer.
+	rdbModuleOpcodeFLOAT  = 3 // Float.
+	rdbModuleOpcodeDOUBLE = 4 // Double.
+	rdbModuleOpcodeSTRING = 5 // String.
+)
+
+func ReadModuleUnsigned(rd io.Reader) string {
+	opcode := ReadByte(rd)
+	if opcode != rdbModuleOpcodeUINT {
+		log.Panicf("Unknown module unsigned encode type")
+	}
+	value := ReadLength(rd)
+	return strconv.FormatUint(value, 10)
+}
+
+func ReadModuleSigned(rd io.Reader) string {
+	opcode := ReadByte(rd)
+	if opcode != rdbModuleOpcodeSINT {
+		log.Panicf("Unknown module signed encode type")
+	}
+	value := ReadLength(rd)
+	return strconv.FormatUint(value, 10)
+}
+
+func ReadModuleFloat(rd io.Reader) string {
+	opcode := ReadByte(rd)
+	if opcode != rdbModuleOpcodeDOUBLE {
+
+		log.Panicf("Unknown module double encode type")
+	}
+	value := ReadDouble(rd)
+	return fmt.Sprintf("%f", value)
+}
+
+func ReadModuleDouble(rd io.Reader) string {
+	opcode := ReadByte(rd)
+	if opcode != rdbModuleOpcodeDOUBLE {
+		log.Panicf("Unknown module double encode type")
+	}
+	value := ReadDouble(rd)
+	return fmt.Sprintf("%f", value)
+}
+
+func ReadModuleString(rd io.Reader) string {
+	opcode := ReadByte(rd)
+	if opcode != rdbModuleOpcodeSTRING {
+		log.Panicf("Unknown module string encode type")
+	}
+	return ReadString(rd)
+}
+
+func ReadModuleEof(rd io.Reader) error {
+	eof := ReadLength(rd)
+	if eof != rdbModuleOpcodeEOF {
+		log.Panicf("The RDB file is not teminated by the proper module value EOF marker")
+	}
+	return nil
+
+}