private void renderErrorStructure()

in codegen/smithy-go-codegen/src/main/java/software/amazon/smithy/go/codegen/StructureGenerator.java [137:193]
43 lines of code
6 McCabe index (conditional complexity)

    private void renderErrorStructure() {
        Symbol structureSymbol = symbolProvider.toSymbol(shape);
        writer.addUseImports(SmithyGoDependency.SMITHY);
        writer.addUseImports(SmithyGoDependency.FMT);
        ErrorTrait errorTrait = shape.expectTrait(ErrorTrait.class);

        // Write out a struct to hold the error data.
        writer.writeShapeDocs(shape);
        writer.openBlock("type $L struct {", "}", structureSymbol.getName(), () -> {
            // The message is the only part of the standard APIError interface that isn't known ahead of time.
            // Message is a pointer mostly for the sake of consistency.
            writer.write("Message *string").write("");
            writer.write("ErrorCodeOverride *string").write("");

            for (MemberShape member : shape.getAllMembers().values()) {
                String memberName = symbolProvider.toMemberName(member);
                // error messages are represented under Message for consistency
                if (!ERROR_MEMBER_NAMES.contains(memberName)) {
                    writer.write("$L $P", memberName, symbolProvider.toSymbol(member));
                }
            }

            writer.write("");
            writer.write("$L", ProtocolDocumentGenerator.NO_DOCUMENT_SERDE_TYPE_NAME);
        }).write("");

        // write the Error method to satisfy the standard error interface
        writer.openBlock("func (e *$L) Error() string {", "}", structureSymbol.getName(), () -> {
            writer.write("return fmt.Sprintf(\"%s: %s\", e.ErrorCode(), e.ErrorMessage())");
        });

        // Write out methods to satisfy the APIError interface. All but the message are known ahead of time,
        // and for those we just encode the information in the method itself.
        writer.openBlock("func (e *$L) ErrorMessage() string {", "}", structureSymbol.getName(), () -> {
            writer.openBlock("if e.Message == nil {", "}", () -> {
                writer.write("return \"\"");
            });
            writer.write("return *e.Message");
        });

        String errorCode = protocolGenerator == null ? shape.getId().getName(service)
                : protocolGenerator.getErrorCode(service, shape);
        writer.openBlock("func (e *$L) ErrorCode() string {", "}", structureSymbol.getName(), () -> {
            writer.openBlock("if e == nil || e.ErrorCodeOverride == nil {", "}", () -> {
                writer.write("return $S", errorCode);
            });
            writer.write("return *e.ErrorCodeOverride");
        });

        String fault = "smithy.FaultUnknown";
        if (errorTrait.isClientError()) {
            fault = "smithy.FaultClient";
        } else if (errorTrait.isServerError()) {
            fault = "smithy.FaultServer";
        }
        writer.write("func (e *$L) ErrorFault() smithy.ErrorFault { return $L }", structureSymbol.getName(), fault);
    }