|
| 1 | +package main |
| 2 | + |
| 3 | +import ( |
| 4 | + "encoding/json" |
| 5 | + "fmt" |
| 6 | + "io" |
| 7 | + "log" |
| 8 | + "mime/multipart" |
| 9 | + "net/http" |
| 10 | + "os" |
| 11 | + "time" |
| 12 | + |
| 13 | + "github.com/5stackgg/demo-parser/internal/parser" |
| 14 | +) |
| 15 | + |
| 16 | +type parseRequest struct { |
| 17 | + MatchMapDemoID string `json:"match_map_demo_id"` |
| 18 | + DemoURL string `json:"demo_url"` |
| 19 | +} |
| 20 | + |
| 21 | +func runServer() { |
| 22 | + addr := os.Getenv("LISTEN_ADDR") |
| 23 | + if addr == "" { |
| 24 | + addr = ":8080" |
| 25 | + } |
| 26 | + |
| 27 | + mux := http.NewServeMux() |
| 28 | + mux.HandleFunc("/health", handleHealth) |
| 29 | + mux.HandleFunc("/parse", handleParse) |
| 30 | + mux.HandleFunc("/parse-file", handleParseFile) |
| 31 | + |
| 32 | + srv := &http.Server{ |
| 33 | + Addr: addr, |
| 34 | + Handler: mux, |
| 35 | + ReadHeaderTimeout: 10 * time.Second, |
| 36 | + WriteTimeout: 5 * time.Minute, |
| 37 | + } |
| 38 | + log.Printf("demo-parser listening on %s", addr) |
| 39 | + if err := srv.ListenAndServe(); err != nil { |
| 40 | + log.Fatalf("server: %v", err) |
| 41 | + } |
| 42 | +} |
| 43 | + |
| 44 | +func handleHealth(w http.ResponseWriter, _ *http.Request) { |
| 45 | + w.WriteHeader(http.StatusOK) |
| 46 | + _, _ = w.Write([]byte("ok")) |
| 47 | +} |
| 48 | + |
| 49 | +// handleParse fetches a demo from a (typically pre-signed) URL and |
| 50 | +// returns its parsed Result as JSON. |
| 51 | +func handleParse(w http.ResponseWriter, r *http.Request) { |
| 52 | + if r.Method != http.MethodPost { |
| 53 | + http.Error(w, "method not allowed", http.StatusMethodNotAllowed) |
| 54 | + return |
| 55 | + } |
| 56 | + var req parseRequest |
| 57 | + if err := json.NewDecoder(r.Body).Decode(&req); err != nil { |
| 58 | + http.Error(w, fmt.Sprintf("bad request: %v", err), http.StatusBadRequest) |
| 59 | + return |
| 60 | + } |
| 61 | + if req.DemoURL == "" { |
| 62 | + http.Error(w, "demo_url required", http.StatusBadRequest) |
| 63 | + return |
| 64 | + } |
| 65 | + |
| 66 | + logPrefix := req.MatchMapDemoID |
| 67 | + if logPrefix == "" { |
| 68 | + logPrefix = "<no-id>" |
| 69 | + } |
| 70 | + log.Printf("[%s] fetching demo", logPrefix) |
| 71 | + |
| 72 | + demoResp, err := http.Get(req.DemoURL) |
| 73 | + if err != nil { |
| 74 | + http.Error(w, fmt.Sprintf("fetch demo: %v", err), http.StatusBadGateway) |
| 75 | + return |
| 76 | + } |
| 77 | + defer demoResp.Body.Close() |
| 78 | + if demoResp.StatusCode >= 400 { |
| 79 | + http.Error(w, |
| 80 | + fmt.Sprintf("fetch demo: upstream %d", demoResp.StatusCode), |
| 81 | + http.StatusBadGateway, |
| 82 | + ) |
| 83 | + return |
| 84 | + } |
| 85 | + |
| 86 | + parseAndRespond(w, demoResp.Body, logPrefix) |
| 87 | +} |
| 88 | + |
| 89 | +// handleParseFile is the pre-upload entry point used by a game-server |
| 90 | +// node that has the .dem on local disk. The .dem streams in via |
| 91 | +// multipart/form-data on the "demo" field — never buffered to memory |
| 92 | +// or disk. |
| 93 | +func handleParseFile(w http.ResponseWriter, r *http.Request) { |
| 94 | + if r.Method != http.MethodPost { |
| 95 | + http.Error(w, "method not allowed", http.StatusMethodNotAllowed) |
| 96 | + return |
| 97 | + } |
| 98 | + |
| 99 | + mr, err := r.MultipartReader() |
| 100 | + if err != nil { |
| 101 | + http.Error(w, fmt.Sprintf("bad multipart: %v", err), http.StatusBadRequest) |
| 102 | + return |
| 103 | + } |
| 104 | + |
| 105 | + var ( |
| 106 | + filePart *multipart.Part |
| 107 | + fileName string |
| 108 | + ) |
| 109 | + for { |
| 110 | + part, err := mr.NextPart() |
| 111 | + if err == io.EOF { |
| 112 | + break |
| 113 | + } |
| 114 | + if err != nil { |
| 115 | + http.Error(w, fmt.Sprintf("read part: %v", err), http.StatusBadRequest) |
| 116 | + return |
| 117 | + } |
| 118 | + if part.FormName() == "demo" { |
| 119 | + filePart = part |
| 120 | + fileName = part.FileName() |
| 121 | + break |
| 122 | + } |
| 123 | + _ = part.Close() |
| 124 | + } |
| 125 | + |
| 126 | + if filePart == nil { |
| 127 | + http.Error(w, "missing 'demo' form field", http.StatusBadRequest) |
| 128 | + return |
| 129 | + } |
| 130 | + defer filePart.Close() |
| 131 | + |
| 132 | + logPrefix := fileName |
| 133 | + if logPrefix == "" { |
| 134 | + logPrefix = "<no-name>" |
| 135 | + } |
| 136 | + log.Printf("[%s] parsing uploaded demo", logPrefix) |
| 137 | + |
| 138 | + parseAndRespond(w, filePart, logPrefix) |
| 139 | +} |
| 140 | + |
| 141 | +func parseAndRespond(w http.ResponseWriter, body io.Reader, logPrefix string) { |
| 142 | + start := time.Now() |
| 143 | + result, err := parser.Parse(body) |
| 144 | + if err != nil { |
| 145 | + log.Printf("[%s] parse error: %v", logPrefix, err) |
| 146 | + http.Error(w, fmt.Sprintf("parse: %v", err), http.StatusUnprocessableEntity) |
| 147 | + return |
| 148 | + } |
| 149 | + log.Printf( |
| 150 | + "[%s] parsed in %s: ticks=%d tick_rate=%.1f rounds=%d map=%s", |
| 151 | + logPrefix, time.Since(start), |
| 152 | + result.TotalTicks, result.TickRate, len(result.RoundTicks), result.MapName, |
| 153 | + ) |
| 154 | + |
| 155 | + w.Header().Set("Content-Type", "application/json") |
| 156 | + w.WriteHeader(http.StatusOK) |
| 157 | + if err := json.NewEncoder(w).Encode(result); err != nil { |
| 158 | + log.Printf("[%s] response encode: %v", logPrefix, err) |
| 159 | + } |
| 160 | +} |
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