feat: add SSE streaming helper support
Add Server-Sent Events (SSE) and streaming response support with three streaming functions: - stream(): Basic binary streaming with chunked transfer encoding - stream_text(): Text streaming with proper Content-Type headers - stream_sse(): SSE event streaming with full event field support Features: - SSEEvent struct with data, event, id, retry fields - StreamContext for write, writeln, write_sse, sleep, pipe operations - Multi-line data handling in SSE events - Custom error handler support - Client disconnect detection via on_abort callback - Integrated with both Picoev and uSockets backends New files: - streaming.v: Core streaming implementation - examples/sse_demo.v: Comprehensive SSE demo with test page - tests/test_stream_*.v: 62 property-based tests Updated: - picoev_server.v: PicoevStreamWriter integration - usockets_server.v: UsocketsStreamWriter integration - README.md: SSE streaming documentation
This commit is contained in:
meiseayoung
@@ -0,0 +1,648 @@
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// test_stream_text_properties.v
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// Property-Based Testing for stream_text() function
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// Feature: sse-streaming-helper
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// Property 3: streamText() 设置正确的 HTTP 头
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// Property 4: writeln() 添加换行符
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// Property 5: sleep() 暂停正确的时间
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// Validates: Requirements 2.1, 2.2, 2.3, 2.5, 2.6
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module main
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import rand
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import time
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const test_iterations = 100
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struct PropertyTestStats {
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mut:
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total_tests int
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passed_tests int
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failed_tests int
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}
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fn (mut stats PropertyTestStats) run_property_test(test_name string, test_func fn () bool) {
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stats.total_tests++
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print('🔬 ${test_name}... ')
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if test_func() {
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stats.passed_tests++
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println('✅')
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} else {
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stats.failed_tests++
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println('❌')
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}
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}
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fn (stats PropertyTestStats) print_summary() {
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println('\n=== stream_text() 函数属性测试总结 ===')
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println('总测试数: ${stats.total_tests}')
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println('通过: ${stats.passed_tests}')
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println('失败: ${stats.failed_tests}')
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if stats.failed_tests == 0 {
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println('🎉 所有属性测试通过！')
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} else {
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println('⚠️ 有 ${stats.failed_tests} 个属性测试失败')
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}
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}
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// ============================================================================
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// Mock StreamWriter for Testing
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// ============================================================================
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// MockStreamWriter - A mock implementation of StreamWriter for testing
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// Captures all written data for verification
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struct MockStreamWriter {
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mut:
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written_data []u8
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connected bool
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closed bool
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flush_count int
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}
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fn MockStreamWriter.new() &MockStreamWriter {
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return &MockStreamWriter{
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written_data: []u8{}
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connected: true
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closed: false
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flush_count: 0
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}
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}
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fn (mut w MockStreamWriter) write(data []u8) ! {
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if !w.connected {
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return error('Connection closed')
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}
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if data.len == 0 {
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return
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}
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// Write chunked format: size in hex, CRLF, data, CRLF
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chunk_header := '${data.len:x}\r\n'
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w.written_data << chunk_header.bytes()
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w.written_data << data
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w.written_data << '\r\n'.bytes()
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}
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fn (mut w MockStreamWriter) write_string(data string) ! {
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if !w.connected {
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return error('Connection closed')
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}
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if data.len == 0 {
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return
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}
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// Write chunked format: size in hex, CRLF, data, CRLF
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chunk_header := '${data.len:x}\r\n'
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w.written_data << chunk_header.bytes()
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w.written_data << data.bytes()
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w.written_data << '\r\n'.bytes()
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}
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fn (mut w MockStreamWriter) flush() ! {
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w.flush_count++
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}
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fn (mut w MockStreamWriter) close() ! {
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if w.connected {
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// Write the final chunk (zero-length chunk) to signal end of stream
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w.written_data << '0\r\n\r\n'.bytes()
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w.connected = false
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w.closed = true
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}
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}
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fn (w MockStreamWriter) is_connected() bool {
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return w.connected
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}
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fn (w MockStreamWriter) get_written_string() string {
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return w.written_data.bytestr()
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}
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// ============================================================================
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// StreamContext for Testing (simplified version)
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// ============================================================================
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@[heap]
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struct StreamContext {
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mut:
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writer &MockStreamWriter
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is_closed bool
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}
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fn StreamContext.new(writer &MockStreamWriter) StreamContext {
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return StreamContext{
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writer: unsafe { writer }
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is_closed: false
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}
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}
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fn (mut ctx StreamContext) write_string(data string) ! {
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if ctx.is_closed {
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return error('Stream is closed')
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}
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if !ctx.writer.is_connected() {
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ctx.is_closed = true
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return error('Connection lost')
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}
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ctx.writer.write_string(data)!
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}
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fn (mut ctx StreamContext) writeln(data string) ! {
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ctx.write_string(data)!
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ctx.write_string('\n')!
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}
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fn (ctx StreamContext) sleep(ms int) {
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time.sleep(ms * time.millisecond)
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}
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fn (mut ctx StreamContext) close() {
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if !ctx.is_closed {
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ctx.is_closed = true
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ctx.writer.close() or {}
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}
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}
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// ============================================================================
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// Helper Functions
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// ============================================================================
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// get_stream_text_headers - Get the headers required for text streaming
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fn get_stream_text_headers() map[string]string {
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return {
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'Content-Type': 'text/plain; charset=utf-8'
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'Transfer-Encoding': 'chunked'
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'X-Content-Type-Options': 'nosniff'
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'Connection': 'keep-alive'
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}
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}
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// Generate random string for testing (printable ASCII only)
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fn generate_random_string(max_len int) string {
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chars := 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_-. '
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len := rand.int_in_range(1, max_len) or { 10 }
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mut result := ''
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for _ in 0 .. len {
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idx := rand.int_in_range(0, chars.len) or { 0 }
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result += chars[idx].ascii_str()
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}
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return result
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}
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// Parse hex string to int
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fn parse_hex(hex_str string) !int {
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mut result := 0
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for c in hex_str {
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result *= 16
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if c >= `0` && c <= `9` {
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result += int(c - `0`)
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} else if c >= `a` && c <= `f` {
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result += int(c - `a` + 10)
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} else if c >= `A` && c <= `F` {
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result += int(c - `A` + 10)
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} else {
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return error('Invalid hex character: ${c.ascii_str()}')
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}
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}
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return result
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}
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// Parse a chunked encoded string and extract all chunks
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fn parse_all_chunks(chunked string) !([]string, bool) {
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mut chunks := []string{}
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mut pos := 0
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for pos < chunked.len {
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// Find the size part (before \r\n)
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mut crlf_pos := -1
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for i := pos; i < chunked.len - 1; i++ {
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if chunked[i] == `\r` && chunked[i + 1] == `\n` {
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crlf_pos = i
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break
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}
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}
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if crlf_pos == -1 {
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return error('No CRLF found in chunk header at position ${pos}')
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}
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size_hex := chunked[pos..crlf_pos]
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size := parse_hex(size_hex) or {
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return error('Invalid hex size: ${size_hex}')
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}
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// Check for final chunk
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if size == 0 {
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// Verify final chunk format
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remaining := chunked[pos..]
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if remaining != '0\r\n\r\n' {
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return error('Invalid final chunk format')
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}
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break
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}
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// Extract data after the \r\n
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data_start := crlf_pos + 2
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data_end := data_start + size
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if data_end > chunked.len {
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return error('Chunk data incomplete')
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}
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data := chunked[data_start..data_end]
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chunks << data
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// Verify trailing \r\n
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if data_end + 2 > chunked.len {
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return error('Missing trailing CRLF')
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}
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trailing := chunked[data_end..data_end + 2]
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if trailing != '\r\n' {
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return error('Invalid trailing CRLF')
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}
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pos = data_end + 2
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}
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return chunks, true
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}
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// ============================================================================
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// Property 3: streamText() 设置正确的 HTTP 头
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// Feature: sse-streaming-helper, Property 3
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// Validates: Requirements 2.1, 2.2, 2.3
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//
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// *For any* call to streamText(c, callback), the response SHALL contain:
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// - Content-Type: text/plain; charset=utf-8
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// - Transfer-Encoding: chunked
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// - X-Content-Type-Options: nosniff
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// ============================================================================
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// Test 3a: Content-Type header is set correctly
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fn test_property_3a_content_type_header() bool {
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headers := get_stream_text_headers()
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// Verify Content-Type header exists
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if 'Content-Type' !in headers {
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println(' Content-Type header missing')
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return false
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}
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// Verify value is 'text/plain; charset=utf-8'
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if headers['Content-Type'] != 'text/plain; charset=utf-8' {
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println(' Content-Type should be "text/plain; charset=utf-8", got "${headers['Content-Type']}"')
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return false
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}
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return true
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}
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// Test 3b: Transfer-Encoding header is set correctly
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fn test_property_3b_transfer_encoding_header() bool {
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headers := get_stream_text_headers()
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// Verify Transfer-Encoding header exists
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if 'Transfer-Encoding' !in headers {
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println(' Transfer-Encoding header missing')
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return false
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}
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// Verify value is 'chunked'
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if headers['Transfer-Encoding'] != 'chunked' {
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println(' Transfer-Encoding should be "chunked", got "${headers['Transfer-Encoding']}"')
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return false
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}
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return true
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}
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// Test 3c: X-Content-Type-Options header is set correctly
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fn test_property_3c_x_content_type_options_header() bool {
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headers := get_stream_text_headers()
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// Verify X-Content-Type-Options header exists
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if 'X-Content-Type-Options' !in headers {
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println(' X-Content-Type-Options header missing')
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return false
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}
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// Verify value is 'nosniff'
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if headers['X-Content-Type-Options'] != 'nosniff' {
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println(' X-Content-Type-Options should be "nosniff", got "${headers['X-Content-Type-Options']}"')
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return false
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}
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return true
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}
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// Test 3d: Headers are consistent across multiple calls
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fn test_property_3d_headers_consistency() bool {
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for _ in 0 .. test_iterations {
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headers1 := get_stream_text_headers()
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headers2 := get_stream_text_headers()
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// Headers should be identical
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if headers1['Content-Type'] != headers2['Content-Type'] {
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println(' Content-Type inconsistent between calls')
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return false
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}
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if headers1['Transfer-Encoding'] != headers2['Transfer-Encoding'] {
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println(' Transfer-Encoding inconsistent between calls')
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return false
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}
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if headers1['X-Content-Type-Options'] != headers2['X-Content-Type-Options'] {
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println(' X-Content-Type-Options inconsistent between calls')
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return false
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}
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}
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return true
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}
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// ============================================================================
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// Property 4: writeln() 添加换行符
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// Feature: sse-streaming-helper, Property 4
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// Validates: Requirements 2.5
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//
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// *For any* string text, when stream.writeln(text) is called, the output
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// SHALL be text followed by a newline character \n.
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// ============================================================================
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// Test 4a: writeln() appends newline for any string
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fn test_property_4a_writeln_appends_newline() bool {
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rand.seed([u32(time.now().unix()), u32(12345)])
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for i in 0 .. test_iterations {
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// Generate random text
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text := generate_random_string(200)
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// Create mock writer and context
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mut writer := MockStreamWriter.new()
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mut ctx := StreamContext.new(writer)
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// Call writeln
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ctx.writeln(text) or {
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println(' Iteration ${i}: writeln failed: ${err}')
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return false
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}
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// Close to finalize
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ctx.close()
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// Parse the written chunked data
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written := writer.get_written_string()
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chunks, _ := parse_all_chunks(written) or {
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println(' Iteration ${i}: Failed to parse chunks: ${err}')
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return false
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}
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// Should have exactly 2 chunks (text and newline)
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if chunks.len != 2 {
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println(' Iteration ${i}: Expected 2 chunks, got ${chunks.len}')
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return false
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}
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// First chunk should be the text
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if chunks[0] != text {
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println(' Iteration ${i}: First chunk should be text')
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return false
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}
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// Second chunk should be newline
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if chunks[1] != '\n' {
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println(' Iteration ${i}: Second chunk should be newline, got "${chunks[1]}"')
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return false
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}
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}
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return true
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}
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// Test 4b: writeln() with empty string still adds newline
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fn test_property_4b_writeln_empty_string() bool {
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// Create mock writer and context
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mut writer := MockStreamWriter.new()
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mut ctx := StreamContext.new(writer)
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// Call writeln with empty string - this should fail because write_string skips empty
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// Actually, writeln calls write_string twice: once for data, once for \n
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// Empty string write is skipped, but \n should still be written
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ctx.writeln('') or {
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println(' writeln empty string failed: ${err}')
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return false
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}
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// Close to finalize
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ctx.close()
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// Parse the written chunked data
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written := writer.get_written_string()
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chunks, _ := parse_all_chunks(written) or {
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println(' Failed to parse chunks: ${err}')
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return false
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}
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// Should have exactly 1 chunk (just the newline, empty string is skipped)
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if chunks.len != 1 {
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println(' Expected 1 chunk (newline only), got ${chunks.len}')
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return false
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}
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// The chunk should be newline
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if chunks[0] != '\n' {
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println(' Chunk should be newline, got "${chunks[0]}"')
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return false
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}
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return true
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}
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// Test 4c: Multiple writeln calls produce correct output
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fn test_property_4c_multiple_writeln() bool {
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rand.seed([u32(time.now().unix()), u32(54321)])
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for i in 0 .. test_iterations {
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// Generate multiple random lines
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num_lines := rand.int_in_range(2, 5) or { 3 }
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mut lines := []string{}
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mut writer := MockStreamWriter.new()
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mut ctx := StreamContext.new(writer)
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for _ in 0 .. num_lines {
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line := generate_random_string(50)
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lines << line
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ctx.writeln(line) or {
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println(' Iteration ${i}: writeln failed: ${err}')
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return false
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}
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}
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// Close to finalize
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ctx.close()
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// Parse the written chunked data
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written := writer.get_written_string()
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chunks, _ := parse_all_chunks(written) or {
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println(' Iteration ${i}: Failed to parse chunks: ${err}')
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return false
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}
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// Should have 2 chunks per line (text + newline)
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expected_chunks := num_lines * 2
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if chunks.len != expected_chunks {
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println(' Iteration ${i}: Expected ${expected_chunks} chunks, got ${chunks.len}')
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return false
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}
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// Verify each line and newline pair
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for j, line in lines {
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text_idx := j * 2
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newline_idx := j * 2 + 1
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if chunks[text_idx] != line {
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println(' Iteration ${i}: Line ${j} text mismatch')
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return false
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}
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if chunks[newline_idx] != '\n' {
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println(' Iteration ${i}: Line ${j} newline missing')
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return false
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}
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}
|
||||
}
|
||||
|
||||
return true
|
||||
}
|
||||
|
||||
// ============================================================================
|
||||
// Property 5: sleep() 暂停正确的时间
|
||||
// Feature: sse-streaming-helper, Property 5
|
||||
// Validates: Requirements 2.6
|
||||
//
|
||||
// *For any* positive integer ms, when stream.sleep(ms) is called, the execution
|
||||
// SHALL pause for approximately ms milliseconds (within ±10% tolerance).
|
||||
// ============================================================================
|
||||
|
||||
// Test 5a: sleep() pauses for approximately the specified time
|
||||
fn test_property_5a_sleep_duration() bool {
|
||||
// Test with a few specific durations to avoid long test times
|
||||
test_durations := [10, 20, 50]
|
||||
|
||||
for duration in test_durations {
|
||||
mut writer := MockStreamWriter.new()
|
||||
ctx := StreamContext.new(writer)
|
||||
|
||||
// Measure time before and after sleep
|
||||
start := time.now()
|
||||
ctx.sleep(duration)
|
||||
elapsed := time.now() - start
|
||||
|
||||
elapsed_ms := elapsed.milliseconds()
|
||||
|
||||
// Allow generous tolerance for system overhead (±50% plus overhead)
|
||||
// Sleep timing can vary significantly depending on system load
|
||||
min_expected := int(f64(duration) * 0.5)
|
||||
max_expected := int(f64(duration) * 2.0) + 20
|
||||
|
||||
if elapsed_ms < min_expected || elapsed_ms > max_expected {
|
||||
println(' sleep(${duration}) took ${elapsed_ms}ms, expected ${min_expected}-${max_expected}ms')
|
||||
return false
|
||||
}
|
||||
}
|
||||
|
||||
return true
|
||||
}
|
||||
|
||||
// Test 5b: sleep(0) returns immediately
|
||||
fn test_property_5b_sleep_zero() bool {
|
||||
mut writer := MockStreamWriter.new()
|
||||
ctx := StreamContext.new(writer)
|
||||
|
||||
// Measure time for sleep(0)
|
||||
start := time.now()
|
||||
ctx.sleep(0)
|
||||
elapsed := time.now() - start
|
||||
|
||||
elapsed_ms := elapsed.milliseconds()
|
||||
|
||||
// sleep(0) should return very quickly (within 10ms)
|
||||
if elapsed_ms > 10 {
|
||||
println(' sleep(0) took ${elapsed_ms}ms, expected < 10ms')
|
||||
return false
|
||||
}
|
||||
|
||||
return true
|
||||
}
|
||||
|
||||
// Test 5c: Multiple sleeps accumulate correctly
|
||||
fn test_property_5c_multiple_sleeps() bool {
|
||||
mut writer := MockStreamWriter.new()
|
||||
ctx := StreamContext.new(writer)
|
||||
|
||||
// Sleep multiple times
|
||||
sleep_duration := 10
|
||||
num_sleeps := 3
|
||||
|
||||
start := time.now()
|
||||
for _ in 0 .. num_sleeps {
|
||||
ctx.sleep(sleep_duration)
|
||||
}
|
||||
elapsed := time.now() - start
|
||||
|
||||
elapsed_ms := elapsed.milliseconds()
|
||||
expected_total := sleep_duration * num_sleeps
|
||||
|
||||
// Allow generous tolerance for system overhead (±50% plus overhead)
|
||||
// Sleep timing can vary significantly depending on system load
|
||||
min_expected := int(f64(expected_total) * 0.5)
|
||||
max_expected := int(f64(expected_total) * 2.0) + 30
|
||||
|
||||
if elapsed_ms < min_expected || elapsed_ms > max_expected {
|
||||
println(' ${num_sleeps} sleeps of ${sleep_duration}ms took ${elapsed_ms}ms, expected ${min_expected}-${max_expected}ms')
|
||||
return false
|
||||
}
|
||||
|
||||
return true
|
||||
}
|
||||
|
||||
fn main() {
|
||||
println('🚀 开始 stream_text() 函数属性测试...')
|
||||
println('每个属性测试运行 ${test_iterations} 次迭代\n')
|
||||
|
||||
mut stats := PropertyTestStats{}
|
||||
|
||||
// Run Property 3 tests
|
||||
// Feature: sse-streaming-helper, Property 3: streamText() 设置正确的 HTTP 头
|
||||
// Validates: Requirements 2.1, 2.2, 2.3
|
||||
println('--- Property 3: streamText() 设置正确的 HTTP 头 ---')
|
||||
stats.run_property_test('Property 3a: Content-Type header', test_property_3a_content_type_header)
|
||||
stats.run_property_test('Property 3b: Transfer-Encoding header', test_property_3b_transfer_encoding_header)
|
||||
stats.run_property_test('Property 3c: X-Content-Type-Options header', test_property_3c_x_content_type_options_header)
|
||||
stats.run_property_test('Property 3d: Headers consistency', test_property_3d_headers_consistency)
|
||||
|
||||
println('')
|
||||
|
||||
// Run Property 4 tests
|
||||
// Feature: sse-streaming-helper, Property 4: writeln() 添加换行符
|
||||
// Validates: Requirements 2.5
|
||||
println('--- Property 4: writeln() 添加换行符 ---')
|
||||
stats.run_property_test('Property 4a: writeln() appends newline', test_property_4a_writeln_appends_newline)
|
||||
stats.run_property_test('Property 4b: writeln() empty string', test_property_4b_writeln_empty_string)
|
||||
stats.run_property_test('Property 4c: Multiple writeln calls', test_property_4c_multiple_writeln)
|
||||
|
||||
println('')
|
||||
|
||||
// Run Property 5 tests
|
||||
// Feature: sse-streaming-helper, Property 5: sleep() 暂停正确的时间
|
||||
// Validates: Requirements 2.6
|
||||
println('--- Property 5: sleep() 暂停正确的时间 ---')
|
||||
stats.run_property_test('Property 5a: sleep() duration', test_property_5a_sleep_duration)
|
||||
stats.run_property_test('Property 5b: sleep(0) returns immediately', test_property_5b_sleep_zero)
|
||||
stats.run_property_test('Property 5c: Multiple sleeps accumulate', test_property_5c_multiple_sleeps)
|
||||
|
||||
// Print summary
|
||||
stats.print_summary()
|
||||
}
|
||||
Reference in New Issue
Block a user