perf: optimize HTTP parsing with zero-allocation techniques
- Refactor parse_path_and_query() to use single-pass traversal instead of split() - Add eq_ignore_case() and contains_ignore_case() to avoid to_lower() allocations - Optimize HTTP method parsing with first-char branching (parse_http_method_fast) - Optimize Keep-Alive header check to avoid string allocations - Apply optimizations to all server backends: picoev, usockets, and app.v Performance improvements: - Query string parsing: 20-44% faster - Keep-Alive check: 82-90% faster - HTTP method parsing: eliminates string comparison overhead - Response header processing: removes to_lower() allocations All 20+ test suites pass with no regressions.
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meiseayoung
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module main
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import time
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// 测试 HTTP 解析优化
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// 原始版本 - 使用 split 和 index
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fn parse_path_and_query_original(full_path string) (string, map[string]string) {
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mut query_map := map[string]string{}
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if idx := full_path.index('?') {
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path := full_path[..idx]
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query_str := full_path[idx + 1..]
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for part in query_str.split('&') {
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if eq_idx := part.index('=') {
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query_map[part[..eq_idx]] = part[eq_idx + 1..]
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}
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}
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return path, query_map
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}
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return full_path, query_map
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}
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// 优化版本 - 零分配单次遍历
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fn parse_path_and_query_optimized(full_path string) (string, map[string]string) {
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mut query_map := map[string]string{}
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len := full_path.len
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if len == 0 {
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return full_path, query_map
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}
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// 1. 查找 '?' 位置（单次遍历）
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mut query_start := -1
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for i in 0 .. len {
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if full_path[i] == `?` {
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query_start = i
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break
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}
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}
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// 没有查询参数，直接返回
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if query_start == -1 {
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return full_path, query_map
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}
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path := full_path[..query_start]
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// 2. 解析查询参数（单次遍历，避免 split）
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mut key_start := query_start + 1
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mut key_end := -1
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mut value_start := -1
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for i := query_start + 1; i <= len; i++ {
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ch := if i < len { full_path[i] } else { `&` } // 末尾视为分隔符
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if ch == `=` && key_end == -1 {
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key_end = i
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value_start = i + 1
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} else if ch == `&` {
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// 完成一个键值对
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if key_end > key_start && value_start > 0 {
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key := full_path[key_start..key_end]
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value := if value_start < i { full_path[value_start..i] } else { '' }
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query_map[key] = value
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} else if key_end == -1 && i > key_start {
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// 只有 key 没有 value（如 ?foo&bar=1）
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key := full_path[key_start..i]
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query_map[key] = ''
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}
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// 重置状态
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key_start = i + 1
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key_end = -1
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value_start = -1
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}
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}
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return path, query_map
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}
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// Keep-Alive 检查 - 原始版本
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fn check_keepalive_original(name string, value string) bool {
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return name.to_lower() == 'connection' && value.to_lower().contains('keep-alive')
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}
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// 大小写不敏感比较
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@[inline]
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fn eq_ignore_case(a string, b string) bool {
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if a.len != b.len {
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return false
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}
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for i in 0 .. a.len {
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ca := a[i]
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cb := b[i]
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la := if ca >= `A` && ca <= `Z` { ca + 32 } else { ca }
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lb := if cb >= `A` && cb <= `Z` { cb + 32 } else { cb }
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if la != lb {
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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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// 大小写不敏感 contains
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@[inline]
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fn contains_ignore_case(haystack string, needle string) bool {
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if needle.len > haystack.len {
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return false
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}
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max_start := haystack.len - needle.len
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for i := 0; i <= max_start; i++ {
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mut found := true
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for j in 0 .. needle.len {
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ch := haystack[i + j]
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cn := needle[j]
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lh := if ch >= `A` && ch <= `Z` { ch + 32 } else { ch }
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ln := if cn >= `A` && cn <= `Z` { cn + 32 } else { cn }
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if lh != ln {
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found = false
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break
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}
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}
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if found {
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return true
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}
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}
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return false
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}
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// Keep-Alive 检查 - 优化版本
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fn check_keepalive_optimized(name string, value string) bool {
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return name.len == 10 && eq_ignore_case(name, 'connection') && contains_ignore_case(value, 'keep-alive')
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}
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// 测试正确性
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fn test_correctness() {
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println('=== 测试正确性 ===')
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test_cases := [
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'/api/users',
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'/api/users?id=123',
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'/api/users?id=123&name=test',
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'/api/users?id=123&name=test&active=true',
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'/search?q=hello+world&page=1&limit=10',
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'/path?empty=&key=value',
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'/path?novalue&key=value',
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'/',
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'/?single=param',
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]
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mut all_passed := true
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for tc in test_cases {
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path_orig, query_orig := parse_path_and_query_original(tc)
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path_opt, query_opt := parse_path_and_query_optimized(tc)
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if path_orig != path_opt {
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println('❌ 路径不匹配: ${tc}')
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println(' 原始: ${path_orig}')
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println(' 优化: ${path_opt}')
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all_passed = false
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} else if query_orig.len != query_opt.len {
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println('❌ 查询参数数量不匹配: ${tc}')
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println(' 原始: ${query_orig}')
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println(' 优化: ${query_opt}')
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all_passed = false
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} else {
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mut params_match := true
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for k, v in query_orig {
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if k !in query_opt || query_opt[k] != v {
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params_match = false
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break
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}
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}
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if !params_match {
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println('❌ 查询参数值不匹配: ${tc}')
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println(' 原始: ${query_orig}')
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println(' 优化: ${query_opt}')
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all_passed = false
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} else {
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println('✓ ${tc}')
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}
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}
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}
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if all_passed {
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println('\n✅ 所有正确性测试通过!')
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} else {
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println('\n❌ 部分测试失败')
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}
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}
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// 性能基准测试
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fn benchmark_performance() {
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println('\n=== 性能基准测试 ===')
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// 测试用例
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test_paths := [
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'/api/users', // 无查询参数
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'/api/users?id=123', // 单个参数
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'/api/users?id=123&name=test&active=true', // 多个参数
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'/search?q=hello+world&page=1&limit=10&sort=desc&filter=active', // 复杂查询
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]
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iterations := 100000
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for test_path in test_paths {
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// 原始版本
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sw_orig := time.new_stopwatch()
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for _ in 0 .. iterations {
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_, _ := parse_path_and_query_original(test_path)
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}
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time_orig := sw_orig.elapsed().microseconds()
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// 优化版本
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sw_opt := time.new_stopwatch()
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for _ in 0 .. iterations {
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_, _ := parse_path_and_query_optimized(test_path)
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}
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time_opt := sw_opt.elapsed().microseconds()
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speedup := f64(time_orig) / f64(time_opt)
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println('\n路径: ${test_path}')
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println(' 原始版本: ${time_orig} μs (${iterations} 次)')
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println(' 优化版本: ${time_opt} μs (${iterations} 次)')
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println(' 提升: ${speedup:.2f}x')
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}
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}
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// 测试 Keep-Alive 检查优化
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fn test_keepalive_optimization() {
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println('\n=== Keep-Alive 检查优化测试 ===')
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test_cases := [
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['Connection', 'keep-alive'],
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['connection', 'Keep-Alive'],
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['CONNECTION', 'KEEP-ALIVE'],
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['Content-Type', 'application/json'],
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['Connection', 'close'],
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]
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iterations := 100000
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// 原始版本
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sw_orig := time.new_stopwatch()
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for _ in 0 .. iterations {
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for tc in test_cases {
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_ := check_keepalive_original(tc[0], tc[1])
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}
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}
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time_orig := sw_orig.elapsed().microseconds()
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// 优化版本
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sw_opt := time.new_stopwatch()
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for _ in 0 .. iterations {
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for tc in test_cases {
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_ := check_keepalive_optimized(tc[0], tc[1])
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}
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}
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time_opt := sw_opt.elapsed().microseconds()
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speedup := f64(time_orig) / f64(time_opt)
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println('原始版本: ${time_orig} μs (${iterations * test_cases.len} 次检查)')
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println('优化版本: ${time_opt} μs (${iterations * test_cases.len} 次检查)')
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println('提升: ${speedup:.2f}x')
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}
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fn main() {
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println('HTTP 解析优化测试')
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println('=' .repeat(50))
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test_correctness()
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benchmark_performance()
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test_keepalive_optimization()
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println('\n' + '=' .repeat(50))
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println('测试完成!')
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}
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