| 1 | package plugin |
| 2 | |
| 3 | import ( |
| 4 | "errors" |
| 5 | "fmt" |
| 6 | "strings" |
| 7 | "time" |
| 8 | |
| 9 | "reasonix/internal/secrets" |
| 10 | ) |
| 11 | |
| 12 | // defaultStartupTimeout bounds the real initialize + tools/list handshake. |
| 13 | // The model-facing wait stays shorter so a slow but healthy server can finish |
| 14 | // in the background without holding an interactive turn open. |
| 15 | const defaultStartupTimeout = 30 * time.Second |
| 16 | |
| 17 | // DefaultStartupTimeout is the default background handshake safety cap used by |
| 18 | // config and host adapters when no explicit server override is present. |
| 19 | func DefaultStartupTimeout() time.Duration { return defaultStartupTimeout } |
| 20 | |
| 21 | // DefaultStartupWaitBudget is the maximum time one interactive tool call waits |
| 22 | // for a shared background handshake before asking the model to retry later. |
| 23 | func DefaultStartupWaitBudget() time.Duration { return defaultStartTimeout } |
| 24 | |
| 25 | func (s Spec) startupTimeout() time.Duration { |
| 26 | if s.StartupTimeout > 0 { |
| 27 | return s.StartupTimeout |
| 28 | } |
| 29 | if s.DefaultStartupTimeout > 0 { |
| 30 | return s.DefaultStartupTimeout |
| 31 | } |
| 32 | return defaultStartupTimeout |
| 33 | } |
| 34 | |
| 35 | // ResolvedStartupTimeout returns the server override, global default, or the |
| 36 | // built-in background handshake cap, in that order. |
| 37 | func (s Spec) ResolvedStartupTimeout() time.Duration { return s.startupTimeout() } |
| 38 | |
| 39 | type startupFailure struct { |
| 40 | Stage string |
| 41 | Elapsed time.Duration |
| 42 | Stderr string |
| 43 | Err error |
| 44 | } |
| 45 | |
| 46 | func (e *startupFailure) Error() string { |
| 47 | if e == nil { |
| 48 | return "MCP startup failed" |
| 49 | } |
| 50 | stage := strings.TrimSpace(e.Stage) |
| 51 | if stage == "" { |
| 52 | stage = "unknown" |
| 53 | } |
| 54 | msg := fmt.Sprintf("MCP startup %s failed after %s: %v", stage, formatElapsed(e.Elapsed), e.Err) |
| 55 | if stderr := strings.TrimSpace(e.Stderr); stderr != "" { |
| 56 | msg += "; stderr: " + stderr |
| 57 | } |
| 58 | return msg |
| 59 | } |
| 60 | |
| 61 | func (e *startupFailure) Unwrap() error { |
| 62 | if e == nil { |
| 63 | return nil |
| 64 | } |
| 65 | return e.Err |
| 66 | } |
| 67 | |
| 68 | func newStartupFailure(stage string, started time.Time, stderr string, err error) error { |
| 69 | if err == nil { |
| 70 | return nil |
| 71 | } |
| 72 | var existing *startupFailure |
| 73 | if errors.As(err, &existing) { |
| 74 | return err |
| 75 | } |
| 76 | elapsed := time.Since(started) |
| 77 | if elapsed < 0 { |
| 78 | elapsed = 0 |
| 79 | } |
| 80 | return &startupFailure{ |
| 81 | Stage: strings.TrimSpace(stage), |
| 82 | Elapsed: elapsed, |
| 83 | Stderr: secrets.RedactCredentials(strings.TrimSpace(stderr)), |
| 84 | Err: err, |
| 85 | } |
| 86 | } |
| 87 | |
| 88 | func startupFailureDetails(err error) (stage string, elapsed time.Duration, stderr string) { |
| 89 | var startupErr *startupFailure |
| 90 | if !errors.As(err, &startupErr) || startupErr == nil { |
| 91 | return "", 0, "" |
| 92 | } |
| 93 | return startupErr.Stage, startupErr.Elapsed, startupErr.Stderr |
| 94 | } |
| 95 | |
| 96 | func formatElapsed(elapsed time.Duration) string { |
| 97 | if elapsed < time.Millisecond { |
| 98 | return elapsed.String() |
| 99 | } |
| 100 | return elapsed.Round(time.Millisecond).String() |
| 101 | } |
| 102 | |
| 103 | type startupDiagnosticTransport interface { |
| 104 | startupStderr() string |
| 105 | } |
| 106 | |
| 107 | func (c *Client) startupStderr() string { |
| 108 | if c == nil || c.t == nil { |
| 109 | return "" |
| 110 | } |
| 111 | if diagnostic, ok := c.t.(startupDiagnosticTransport); ok { |
| 112 | return diagnostic.startupStderr() |
| 113 | } |
| 114 | return "" |
| 115 | } |
| 116 |