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# frozen_string_literal: true
require 'json'
module HyperstackVM
# Persists VM state to a JSON file with atomic writes (write-to-tmp + rename).
# Used to track provisioned VM ID, IP, WireGuard keys, and related metadata.
class StateStore
def initialize(path)
@path = path
end
attr_reader :path
def load
return nil unless File.exist?(@path)
JSON.parse(File.read(@path))
rescue JSON::ParserError => e
raise Error, "Failed to parse state file #{@path}: #{e.message}"
end
def save(payload)
temp_path = "#{@path}.tmp"
File.write(temp_path, JSON.pretty_generate(payload))
File.rename(temp_path, @path)
end
def delete
File.delete(@path) if File.exist?(@path)
end
end
# Thread-safe output wrapper that prepends a fixed prefix to each line.
# Used by create-both so interleaved output from VM1 and VM2 threads is distinguishable.
# #print buffers partial lines until a newline is received, then flushes with the prefix.
class PrefixedOutput
def initialize(prefix, delegate, mutex)
@prefix = prefix
@delegate = delegate
@mutex = mutex
@buffer = +''
end
def puts(msg = '')
@mutex.synchronize { @delegate.puts("#{@prefix}#{msg}") }
end
def print(msg)
@buffer << msg.to_s
while (idx = @buffer.index("\n"))
line = @buffer.slice!(0, idx + 1)
@mutex.synchronize { @delegate.print("#{@prefix}#{line}") }
end
end
end
end
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