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package roadrunner
import (
"bytes"
"sync"
)
// EventStderrOutput - is triggered when worker sends data into stderr. The context is output data in []bytes form.
const EventStderrOutput = 1900
// thread safe errBuffer
type errBuffer struct {
mu sync.Mutex
buffer *bytes.Buffer
lsn func(event int, ctx interface{})
}
// Listen attaches error stream even listener.
func (b *errBuffer) Listen(l func(event int, ctx interface{})) {
b.mu.Lock()
defer b.mu.Unlock()
b.lsn = l
}
// Len returns the number of bytes of the unread portion of the errBuffer;
// b.Len() == len(b.Bytes()).
func (b *errBuffer) Len() int {
b.mu.Lock()
defer b.mu.Unlock()
return b.buffer.Len()
}
// Write appends the contents of p to the errBuffer, growing the errBuffer as
// needed. The return value n is the length of p; err is always nil. If the
// errBuffer becomes too large, Write will panic with ErrTooLarge.
func (b *errBuffer) Write(p []byte) (n int, err error) {
b.mu.Lock()
defer b.mu.Unlock()
if b.lsn != nil {
b.lsn(EventStderrOutput, p)
}
return b.buffer.Write(p)
}
// Strings fetches all errBuffer data into string.
func (b *errBuffer) String() string {
b.mu.Lock()
defer b.mu.Unlock()
return b.buffer.String()
}
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