| 1 | package main |
| 2 | |
| 3 | import ( |
| 4 | "fmt" |
| 5 | "os" |
| 6 | "path/filepath" |
| 7 | "strings" |
| 8 | |
| 9 | "github.com/BurntSushi/toml" |
| 10 | ) |
| 11 | |
| 12 | // meterUpstream reports the endpoint the meter must forward to: the base_url |
| 13 | // of the provider serving the benchmarked model. Only that provider is ever |
| 14 | // redirected — rewriting every endpoint would send one vendor's traffic to |
| 15 | // another's host. |
| 16 | func meterUpstream(configPath, model string) (upstream string, err error) { |
| 17 | raw, err := os.ReadFile(configPath) |
| 18 | if err != nil { |
| 19 | return "", fmt.Errorf("read config for metering: %w", err) |
| 20 | } |
| 21 | var doc map[string]any |
| 22 | if err := toml.Unmarshal(raw, &doc); err != nil { |
| 23 | return "", fmt.Errorf("parse %s: %w", configPath, err) |
| 24 | } |
| 25 | providers, _ := doc["providers"].([]map[string]any) |
| 26 | if len(providers) == 0 { |
| 27 | if list, ok := doc["providers"].([]any); ok { |
| 28 | for _, entry := range list { |
| 29 | if p, ok := entry.(map[string]any); ok { |
| 30 | providers = append(providers, p) |
| 31 | } |
| 32 | } |
| 33 | } |
| 34 | } |
| 35 | if len(providers) == 0 { |
| 36 | return "", fmt.Errorf("%s declares no [[providers]]; the meter has nothing to redirect", configPath) |
| 37 | } |
| 38 | target := providerForModel(providers, model) |
| 39 | upstream, _ = target["base_url"].(string) |
| 40 | if strings.TrimSpace(upstream) == "" { |
| 41 | return "", fmt.Errorf("provider %v has no base_url to redirect", target["name"]) |
| 42 | } |
| 43 | return upstream, nil |
| 44 | } |
| 45 | |
| 46 | // providerForModel picks the entry that serves model, falling back to the |
| 47 | // first. A benchmark run is single-model, so an exact match is the common case |
| 48 | // and the fallback only matters for a one-provider config. |
| 49 | func providerForModel(providers []map[string]any, model string) map[string]any { |
| 50 | model = strings.TrimSpace(model) |
| 51 | if model != "" { |
| 52 | if _, want, ok := strings.Cut(model, "/"); ok { |
| 53 | model = want |
| 54 | } |
| 55 | for _, p := range providers { |
| 56 | if name, _ := p["default"].(string); name == model { |
| 57 | return p |
| 58 | } |
| 59 | list, _ := p["models"].([]any) |
| 60 | for _, m := range list { |
| 61 | if s, _ := m.(string); s == model { |
| 62 | return p |
| 63 | } |
| 64 | } |
| 65 | if s, _ := p["model"].(string); s == model { |
| 66 | return p |
| 67 | } |
| 68 | } |
| 69 | } |
| 70 | return providers[0] |
| 71 | } |
| 72 | |
| 73 | // writeMeteredConfig rewrites the chosen provider's base_url to meterBase and |
| 74 | // writes the result into dir as config.toml. |
| 75 | func writeMeteredConfig(configPath, dir, model, meterBase string) error { |
| 76 | raw, err := os.ReadFile(configPath) |
| 77 | if err != nil { |
| 78 | return err |
| 79 | } |
| 80 | var doc map[string]any |
| 81 | if err := toml.Unmarshal(raw, &doc); err != nil { |
| 82 | return err |
| 83 | } |
| 84 | var providers []map[string]any |
| 85 | switch list := doc["providers"].(type) { |
| 86 | case []map[string]any: |
| 87 | providers = list |
| 88 | case []any: |
| 89 | for _, entry := range list { |
| 90 | if p, ok := entry.(map[string]any); ok { |
| 91 | providers = append(providers, p) |
| 92 | } |
| 93 | } |
| 94 | } |
| 95 | if len(providers) == 0 { |
| 96 | return fmt.Errorf("%s declares no [[providers]]", configPath) |
| 97 | } |
| 98 | target := providerForModel(providers, model) |
| 99 | target["base_url"] = meterBase |
| 100 | // The redirected endpoint is loopback plaintext; a proxy configured for the |
| 101 | // real vendor host must not be applied to it. |
| 102 | target["no_proxy"] = true |
| 103 | doc["providers"] = providers |
| 104 | |
| 105 | if err := os.MkdirAll(dir, 0o755); err != nil { |
| 106 | return err |
| 107 | } |
| 108 | out, err := os.Create(filepath.Join(dir, "config.toml")) |
| 109 | if err != nil { |
| 110 | return err |
| 111 | } |
| 112 | defer out.Close() |
| 113 | return toml.NewEncoder(out).Encode(doc) |
| 114 | } |
| 115 |