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@ -27,13 +27,13 @@ import ( |
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"strings" |
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"strings" |
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) |
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) |
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// Message structure for results from the SplitStream goroutine
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// Message - message structure for results from the Stream goroutine
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type SplitMessage struct { |
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type Message struct { |
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Data []byte |
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Data []byte |
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Err error |
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Err error |
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} |
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} |
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// SplitStream reads from io.Reader, splits the data into chunks, and sends
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// Stream reads from io.Reader, splits the data into chunks, and sends
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// each chunk to the channel. This method runs until an EOF or error occurs. If
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// each chunk to the channel. This method runs until an EOF or error occurs. If
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// an error occurs, the method sends the error over the channel and returns.
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// an error occurs, the method sends the error over the channel and returns.
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// Before returning, the channel is always closed.
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// Before returning, the channel is always closed.
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@ -41,18 +41,18 @@ type SplitMessage struct { |
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// The user should run this as a gorountine and retrieve the data over the
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// The user should run this as a gorountine and retrieve the data over the
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// channel.
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// channel.
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//
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//
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// channel := make(chan SplitMessage)
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// channel := make(chan Message)
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// go SplitStream(reader, chunkSize, channel)
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// go Stream(reader, chunkSize, channel)
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// for chunk := range channel {
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// for chunk := range channel {
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// log.Println(chunk.Data)
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// log.Println(chunk.Data)
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// }
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// }
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func SplitStream(reader io.Reader, chunkSize uint64) <-chan SplitMessage { |
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func Stream(reader io.Reader, chunkSize uint64) <-chan Message { |
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ch := make(chan SplitMessage) |
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ch := make(chan Message) |
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go splitStreamGoRoutine(reader, chunkSize, ch) |
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go splitStreamGoRoutine(reader, chunkSize, ch) |
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return ch |
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return ch |
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} |
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} |
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func splitStreamGoRoutine(reader io.Reader, chunkSize uint64, ch chan SplitMessage) { |
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func splitStreamGoRoutine(reader io.Reader, chunkSize uint64, ch chan Message) { |
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// we read until EOF or another error
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// we read until EOF or another error
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var readError error |
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var readError error |
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@ -81,12 +81,12 @@ func splitStreamGoRoutine(reader io.Reader, chunkSize uint64, ch chan SplitMessa |
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bytesWriter.Flush() |
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bytesWriter.Flush() |
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// if we have data available, send it over the channel
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// if we have data available, send it over the channel
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if bytesBuffer.Len() != 0 { |
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if bytesBuffer.Len() != 0 { |
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ch <- SplitMessage{bytesBuffer.Bytes(), nil} |
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ch <- Message{bytesBuffer.Bytes(), nil} |
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} |
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} |
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} |
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} |
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// if we have an error other than an EOF, send it over the channel
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// if we have an error other than an EOF, send it over the channel
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if readError != io.EOF { |
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if readError != io.EOF { |
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ch <- SplitMessage{nil, readError} |
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ch <- Message{nil, readError} |
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} |
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} |
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// close the channel, signaling the channel reader that the stream is complete
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// close the channel, signaling the channel reader that the stream is complete
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close(ch) |
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close(ch) |
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@ -142,9 +142,9 @@ func joinFilesGoRoutine(fileInfos []os.FileInfo, writer *io.PipeWriter) { |
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writer.Close() |
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writer.Close() |
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} |
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} |
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// Takes a file and splits it into chunks with size chunkSize. The output
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// FileWithPrefix - Takes a file and splits it into chunks with size chunkSize. The output
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// filename is given with outputPrefix.
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// filename is given with outputPrefix.
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func SplitFileWithPrefix(filename string, chunkSize uint64, outputPrefix string) error { |
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func FileWithPrefix(filename string, chunkSize uint64, outputPrefix string) error { |
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// open file
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// open file
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file, err := os.Open(filename) |
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file, err := os.Open(filename) |
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defer file.Close() |
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defer file.Close() |
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@ -157,7 +157,7 @@ func SplitFileWithPrefix(filename string, chunkSize uint64, outputPrefix string) |
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} |
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} |
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// start stream splitting goroutine
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// start stream splitting goroutine
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ch := SplitStream(file, chunkSize) |
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ch := Stream(file, chunkSize) |
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// used to write each chunk out as a separate file. {{outputPrefix}}.{{i}}
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// used to write each chunk out as a separate file. {{outputPrefix}}.{{i}}
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i := 0 |
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i := 0 |
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