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Hein
276c3814d8
Config gains DefaultLimit/MaxLimit/MaxOffset/MaxBatch/MaxPreloadDepth/MaxWriteRows/QueryTimeout/
ConfirmTTL. Reads are capped and the total COUNT is optional. Errors reach clients as
{code,message}; everything else is logged with a reference. Panics (handler and hooks) are
recovered without returning the panic value.
82 lines
2.4 KiB
Go
82 lines
2.4 KiB
Go
package resolvemcp
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import (
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"crypto/rand"
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"encoding/hex"
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"encoding/json"
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"errors"
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"fmt"
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"github.com/mark3labs/mcp-go/mcp"
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"github.com/bitechdev/ResolveSpec/pkg/logger"
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)
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// Stable error codes returned to MCP clients.
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const (
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CodeInvalidArgument = "invalid_argument"
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CodeNotFound = "not_found"
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CodeForbidden = "forbidden"
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CodeLimitExceeded = "limit_exceeded"
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CodeInternal = "internal"
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)
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// ClientError is an error whose code and message are safe to show to an MCP client.
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// Hooks may return one (NewClientError) to give the client a specific reason; every other error
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// is reported as an opaque internal error with a reference that matches the server log.
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type ClientError struct {
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Code string
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Message string
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}
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func (e *ClientError) Error() string { return e.Message }
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// NewClientError returns an error that reaches the client as {code, message}.
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func NewClientError(code, message string) error {
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return &ClientError{Code: code, Message: message}
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}
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func invalidArg(format string, a ...any) error {
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return NewClientError(CodeInvalidArgument, fmt.Sprintf(format, a...))
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}
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// errInternal is what recovered panics return: the details are logged, not sent.
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var errInternal = NewClientError(CodeInternal, "internal error")
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// clientFacing maps err to the code and message the client sees. Anything that is not a
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// ClientError or a not-found is logged in full with a short reference and reported as an
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// opaque internal error carrying that reference.
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func clientFacing(op string, err error) (code, message string) {
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var ce *ClientError
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switch {
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case errors.As(err, &ce):
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if ce.Code == CodeInternal {
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ref := newRef()
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logger.Error("[resolvemcp] %s: internal error ref=%s: %v", op, ref, err)
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return CodeInternal, "internal error (ref " + ref + ")"
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}
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return ce.Code, ce.Message
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case errors.Is(err, errRecordNotFound):
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return CodeNotFound, "record not found"
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}
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ref := newRef()
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logger.Error("[resolvemcp] %s failed ref=%s: %v", op, ref, err)
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return CodeInternal, "internal error (ref " + ref + ")"
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}
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func newRef() string {
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var b [4]byte
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_, _ = rand.Read(b[:])
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return hex.EncodeToString(b[:])
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}
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// toolError builds the error result for a tool call.
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func toolError(op string, err error) *mcp.CallToolResult {
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code, msg := clientFacing(op, err)
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b, _ := json.Marshal(map[string]any{
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"success": false,
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"error": map[string]string{"code": code, "message": msg},
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})
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return mcp.NewToolResultError(string(b))
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}
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