vendor/github.com/gorilla/websocket/join.go


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// Copyright 2019 The Gorilla WebSocket Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package websocket

import (
    "io"
    "strings"
)

// JoinMessages concatenates received messages to create a single io.Reader.
// The string term is appended to each message. The returned reader does not
// support concurrent calls to the Read method.
func JoinMessages(c *Conn, term string) io.Reader {
    return &joinReader{c: c, term: term}
}

type joinReader struct {
    c    *Conn
    term string
    r    io.Reader
}

func (r *joinReader) Read(p []byte) (int, error) {
    if r.r == nil {
        var err error
        _, r.r, err = r.c.NextReader()
        if err != nil {
            return 0, err
        }
        if r.term != "" {
            r.r = io.MultiReader(r.r, strings.NewReader(r.term))
        }
    }
    n, err := r.r.Read(p)
    if err == io.EOF {
        err = nil
        r.r = nil
    }
    return n, err
}