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a79156c4d0
The daemon API is built as a Swift module called ServalDNA. The new CliContext class allows easy implementation of CLI output using Swift code. The new CliContextFile subclass is the obvious first implementation, equivalent to cli_stdio.c. The 'servaldswift' executable now uses CliContextFile to print its CLI output to standard output. The new delegated log output support constructs each log line in a buffer and prints it by calling the delegate's 'print' function at end-of-line. The 'servaldswift' executable now provides a log output delegate in Swift that simply prints to standard error, replacing log_output_console.o, which is omitted from its link.
55 lines
1.7 KiB
Swift
55 lines
1.7 KiB
Swift
/*
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Serval DNA Swift CLI output to stdio stream
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Copyright 2017 Flinders University
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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import Foundation
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/* An instance of struct cli_vtable that prints all fields to a stdio stream
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* via a buffer. This is the Swift equivalent of cli_stdio.c. It is used by
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* the 'servaldswift' daemon to produce its output.
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*/
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open class CliContextFile: CliContext {
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private var fileHandle: FileHandle
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private var buffer: Data
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private let bufsize: Int? = nil
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public init(_ file: FileHandle) {
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self.fileHandle = file
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self.buffer = Data()
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}
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public override func delim(_ opt: String?) {
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self.puts(ProcessInfo.processInfo.environment["SERVALD_OUTPUT_DELIMITER"] ?? opt ?? "\n")
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}
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public override func write(_ data: Data) {
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self.buffer.append(data)
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if self.bufsize != nil && self.buffer.count >= self.bufsize! {
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self.flush()
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}
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}
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public override func flush() {
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if !self.buffer.isEmpty {
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self.fileHandle.write(self.buffer)
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self.buffer.removeAll()
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}
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}
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}
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