/
read_request_slice.go
56 lines (52 loc) · 1.51 KB
/
read_request_slice.go
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package rscp
import (
"fmt"
"github.com/spali/go-slicereader"
)
// readRequestSlice reads a single request message (recursive for containers) from a slice.
func readRequestSlice(values []interface{}) (*Message, error) {
sr := slicereader.NewSliceReader(values)
return readRequestSliceReader(sr)
}
// readRequestSliceReader reads a single request message (recursive for containers) from the SliceReader.
func readRequestSliceReader(sr *slicereader.SliceReader) (*Message, error) {
var (
t interface{}
tag Tag
isTag bool
err error
)
if t, err = sr.Read(); err != nil {
return nil, err
}
if tag, isTag = t.(Tag); !isTag {
return nil, fmt.Errorf("element at index %d: %w", int(sr.Size()-int64(sr.Len())-1), ErrValidTag)
}
msg := NewMessage(tag, nil)
if msg.DataType == None {
return msg, nil
}
if msg.DataType == Container {
msg.Value = make([]Message, 0)
for sr.Len() > 0 {
var (
subMsg *Message
err error
)
if subMsg, err = readRequestSliceReader(sr); err != nil {
return nil, err
}
msg.Value = append(msg.Value.([]Message), *subMsg)
}
} else {
if msg.Value, err = sr.Read(); err != nil {
return nil, fmt.Errorf("expect value after tag %s with data type %s: %w", msg.Tag, msg.DataType, ErrMissingValue)
}
switch msg.Value.(type) {
case Tag, DataType:
return nil, fmt.Errorf("expect element at index %d to be a value for tag %s, got type: %T: %w",
int(sr.Size()-int64(sr.Len())-1), msg.Tag, msg.Value, ErrDataTypeValueMismatch)
}
}
return msg, nil
}