internal/derrors/derrors.go - pkgsite - Git at Google

 // Copyright 2019 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.

 // Package derrors defines internal error values to categorize the different
 // types error semantics we support.
 package derrors

 import (
 	"errors"
 	"fmt"
 	"net/http"
 )

 //lint:file-ignore ST1012 prefixing error values with Err would stutter

 var (
 	// HasIncompletePackages indicates a module containing packages that
 	// were processed with a 60x error code.
 	HasIncompletePackages = errors.New("has incomplete packages")

 	// NotFound indicates that a requested entity was not found (HTTP 404).
 	NotFound = errors.New("not found")

 	// NotFetched means that the proxy returned "not found" with the
 	// Disable-Module-Fetch header set. We don't know if the module really
 	// doesn't exist, or the proxy just didn't fetch it.
 	NotFetched = errors.New("not fetched by proxy")

 	// InvalidArgument indicates that the input into the request is invalid in
 	// some way (HTTP 400).
 	InvalidArgument = errors.New("invalid argument")
 	// BadModule indicates a problem with a module.
 	BadModule = errors.New("bad module")
 	// Excluded indicates that the module is excluded. (See internal/postgres/excluded.go.)
 	Excluded = errors.New("excluded")

 	// AlternativeModule indicates that the path of the module zip file differs
 	// from the path specified in the go.mod file.
 	AlternativeModule = errors.New("alternative module")

 	// ModuleTooLarge indicates that the module is too large for us to process.
 	// This should be temporary: we should obtain sufficient resources to process
 	// any module, up to the max size allowed by the proxy.
 	ModuleTooLarge = errors.New("module too large")

 	// SheddingLoad indicates that the server is overloaded and cannot process the
 	// module at this time.
 	SheddingLoad = errors.New("shedding load")

 	// Unknown indicates that the error has unknown semantics.
 	Unknown = errors.New("unknown")

 	// ProxyTimedOut indicates that a request timed out when fetching from the Module Mirror.
 	ProxyTimedOut = errors.New("proxy timed out")

 	// PackageBuildContextNotSupported indicates that the build context for the
 	// package is not supported.
 	PackageBuildContextNotSupported = errors.New("package build context not supported")
 	// PackageMaxImportsLimitExceeded indicates that the package has too many
 	// imports.
 	PackageMaxImportsLimitExceeded = errors.New("package max imports limit exceeded")
 	// PackageMaxFileSizeLimitExceeded indicates that the package contains a file
 	// that exceeds fetch.MaxFileSize.
 	PackageMaxFileSizeLimitExceeded = errors.New("package max file size limit exceeded")
 	// PackageDocumentationHTMLTooLarge indicates that the rendered documentation
 	// HTML size exceeded the specified limit for dochtml.RenderOptions.
 	PackageDocumentationHTMLTooLarge = errors.New("package documentation HTML is too large")
 	// PackageBadImportPath represents an error loading a package because its
 	// contents do not make up a valid package. This can happen, for
 	// example, if the .go files fail to parse or declare different package
 	// names.
 	// Go files were found in a directory, but the resulting import path is invalid.
 	PackageBadImportPath = errors.New("package bad import path")
 	// PackageInvalidContents represents an error loading a package because
 	// its contents do not make up a valid package. This can happen, for
 	// example, if the .go files fail to parse or declare different package
 	// names.
 	PackageInvalidContents = errors.New("package invalid contents")

 	// DBModuleInsertInvalid represents a module that was successfully
 	// fetched but could not be inserted due to invalid arguments to
 	// postgres.InsertModule.
 	DBModuleInsertInvalid = errors.New("db module insert invalid")

 	// ReprocessStatusOK indicates that the module to be reprocessed
 	// previously had a status of http.StatusOK.
 	ReprocessStatusOK = errors.New("reprocess status ok")
 	// ReprocessHasIncompletePackages indicates that the module to be reprocessed
 	// previously had a status of 290.
 	ReprocessHasIncompletePackages = errors.New("reprocess has incomplete packages")
 	// ReprocessBadModule indicates that the module to be reprocessed
 	// previously had a status of derrors.BadModule.
 	ReprocessBadModule = errors.New("reprocess bad module")
 	// ReprocessAlternativeModule indicates that the module to be reprocessed
 	// previously had a status of derrors.AlternativeModule.
 	ReprocessAlternative = errors.New("reprocess alternative module")
 	// ReprocessDBModuleInsertInvalid represents a module to be reprocessed
 	// that was successfully fetched but could not be inserted due to invalid
 	// arguments to postgres.InsertModule.
 	ReprocessDBModuleInsertInvalid = errors.New("reprocess db module insert invalid")
 )

 var codes = []struct {
 	err  error
 	code int
 }{
 	{NotFound, http.StatusNotFound},
 	{InvalidArgument, http.StatusBadRequest},
 	{Excluded, http.StatusForbidden},
 	{SheddingLoad, http.StatusServiceUnavailable},

 	// Since the following aren't HTTP statuses, pick unused codes.
 	{HasIncompletePackages, 290},
 	{DBModuleInsertInvalid, 480},
 	{NotFetched, 481},
 	{BadModule, 490},
 	{AlternativeModule, 491},
 	{ModuleTooLarge, 492},

 	{ProxyTimedOut, http.StatusGatewayTimeout},
 	// 52x and 54x errors represents modules that need to be reprocessed, and the
 	// previous status code the module had. Note that the status code
 	// matters for determining reprocessing order.
 	{ReprocessStatusOK, 520},
 	{ReprocessHasIncompletePackages, 521},
 	{ReprocessBadModule, 540},
 	{ReprocessAlternative, 541},
 	{ReprocessDBModuleInsertInvalid, 542},

 	// 60x errors represents errors that occurred when processing a
 	// package.
 	{PackageBuildContextNotSupported, 600},
 	{PackageMaxImportsLimitExceeded, 601},
 	{PackageMaxFileSizeLimitExceeded, 602},
 	{PackageDocumentationHTMLTooLarge, 603},
 	{PackageInvalidContents, 604},
 	{PackageBadImportPath, 605},
 }

 // FromStatus generates an error according for the given status code. It uses
 // the given format string and arguments to create the error string according
 // to the fmt package. If format is the empty string, then the error
 // corresponding to the code is returned unwrapped.
 //
 // If code is http.StatusOK, it returns nil.
 func FromStatus(code int, format string, args ...interface{}) error {
 	if code == http.StatusOK {
 		return nil
 	}
 	var innerErr = Unknown
 	for _, e := range codes {
 		if e.code == code {
 			innerErr = e.err
 			break
 		}
 	}
 	if format == "" {
 		return innerErr
 	}
 	return fmt.Errorf(format+": %w", append(args, innerErr)...)
 }

 // ToStatus returns a status code corresponding to err.
 func ToStatus(err error) int {
 	if err == nil {
 		return http.StatusOK
 	}
 	for _, e := range codes {
 		if errors.Is(err, e.err) {
 			return e.code
 		}
 	}
 	return http.StatusInternalServerError
 }

 // ToReprocessStatus returns the reprocess status code corresponding to the
 // provided status.
 func ToReprocessStatus(status int) int {
 	switch status {
 	case http.StatusOK:
 		return ToStatus(ReprocessStatusOK)
 	case ToStatus(HasIncompletePackages):
 		return ToStatus(ReprocessHasIncompletePackages)
 	case ToStatus(BadModule):
 		return ToStatus(ReprocessBadModule)
 	case ToStatus(AlternativeModule):
 		return ToStatus(ReprocessAlternative)
 	case ToStatus(DBModuleInsertInvalid):
 		return ToStatus(ReprocessDBModuleInsertInvalid)
 	default:
 		return status
 	}
 }

 // Add adds context to the error.
 // The result cannot be unwrapped to recover the original error.
 // It does nothing when *errp == nil.
 //
 // Example:
 //
 //	defer derrors.Add(&err, "copy(%s, %s)", src, dst)
 //
 // See Wrap for an equivalent function that allows
 // the result to be unwrapped.
 func Add(errp *error, format string, args ...interface{}) {
 	if *errp != nil {
 		*errp = fmt.Errorf("%s: %v", fmt.Sprintf(format, args...), *errp)
 	}
 }

 // Wrap adds context to the error and allows
 // unwrapping the result to recover the original error.
 //
 // Example:
 //
 //	defer derrors.Wrap(&err, "copy(%s, %s)", src, dst)
 //
 // See Add for an equivalent function that does not allow
 // the result to be unwrapped.
 func Wrap(errp *error, format string, args ...interface{}) {
 	if *errp != nil {
 		*errp = fmt.Errorf("%s: %w", fmt.Sprintf(format, args...), *errp)
 	}
 }
	// Copyright 2019 The Go Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style
	// license that can be found in the LICENSE file.

	// Package derrors defines internal error values to categorize the different
	// types error semantics we support.
	package derrors

	import (
	"errors"
	"fmt"
	"net/http"
	)

	//lint:file-ignore ST1012 prefixing error values with Err would stutter

	var (
	// HasIncompletePackages indicates a module containing packages that
	// were processed with a 60x error code.
	HasIncompletePackages = errors.New("has incomplete packages")

	// NotFound indicates that a requested entity was not found (HTTP 404).
	NotFound = errors.New("not found")

	// NotFetched means that the proxy returned "not found" with the
	// Disable-Module-Fetch header set. We don't know if the module really
	// doesn't exist, or the proxy just didn't fetch it.
	NotFetched = errors.New("not fetched by proxy")

	// InvalidArgument indicates that the input into the request is invalid in
	// some way (HTTP 400).
	InvalidArgument = errors.New("invalid argument")
	// BadModule indicates a problem with a module.
	BadModule = errors.New("bad module")
	// Excluded indicates that the module is excluded. (See internal/postgres/excluded.go.)
	Excluded = errors.New("excluded")

	// AlternativeModule indicates that the path of the module zip file differs
	// from the path specified in the go.mod file.
	AlternativeModule = errors.New("alternative module")

	// ModuleTooLarge indicates that the module is too large for us to process.
	// This should be temporary: we should obtain sufficient resources to process
	// any module, up to the max size allowed by the proxy.
	ModuleTooLarge = errors.New("module too large")

	// SheddingLoad indicates that the server is overloaded and cannot process the
	// module at this time.
	SheddingLoad = errors.New("shedding load")

	// Unknown indicates that the error has unknown semantics.
	Unknown = errors.New("unknown")

	// ProxyTimedOut indicates that a request timed out when fetching from the Module Mirror.
	ProxyTimedOut = errors.New("proxy timed out")

	// PackageBuildContextNotSupported indicates that the build context for the
	// package is not supported.
	PackageBuildContextNotSupported = errors.New("package build context not supported")
	// PackageMaxImportsLimitExceeded indicates that the package has too many
	// imports.
	PackageMaxImportsLimitExceeded = errors.New("package max imports limit exceeded")
	// PackageMaxFileSizeLimitExceeded indicates that the package contains a file
	// that exceeds fetch.MaxFileSize.
	PackageMaxFileSizeLimitExceeded = errors.New("package max file size limit exceeded")
	// PackageDocumentationHTMLTooLarge indicates that the rendered documentation
	// HTML size exceeded the specified limit for dochtml.RenderOptions.
	PackageDocumentationHTMLTooLarge = errors.New("package documentation HTML is too large")
	// PackageBadImportPath represents an error loading a package because its
	// contents do not make up a valid package. This can happen, for
	// example, if the .go files fail to parse or declare different package
	// names.
	// Go files were found in a directory, but the resulting import path is invalid.
	PackageBadImportPath = errors.New("package bad import path")
	// PackageInvalidContents represents an error loading a package because
	// its contents do not make up a valid package. This can happen, for
	// example, if the .go files fail to parse or declare different package
	// names.
	PackageInvalidContents = errors.New("package invalid contents")

	// DBModuleInsertInvalid represents a module that was successfully
	// fetched but could not be inserted due to invalid arguments to
	// postgres.InsertModule.
	DBModuleInsertInvalid = errors.New("db module insert invalid")

	// ReprocessStatusOK indicates that the module to be reprocessed
	// previously had a status of http.StatusOK.
	ReprocessStatusOK = errors.New("reprocess status ok")
	// ReprocessHasIncompletePackages indicates that the module to be reprocessed
	// previously had a status of 290.
	ReprocessHasIncompletePackages = errors.New("reprocess has incomplete packages")
	// ReprocessBadModule indicates that the module to be reprocessed
	// previously had a status of derrors.BadModule.
	ReprocessBadModule = errors.New("reprocess bad module")
	// ReprocessAlternativeModule indicates that the module to be reprocessed
	// previously had a status of derrors.AlternativeModule.
	ReprocessAlternative = errors.New("reprocess alternative module")
	// ReprocessDBModuleInsertInvalid represents a module to be reprocessed
	// that was successfully fetched but could not be inserted due to invalid
	// arguments to postgres.InsertModule.
	ReprocessDBModuleInsertInvalid = errors.New("reprocess db module insert invalid")
	)

	var codes = []struct {
	err error
	code int
	}{
	{NotFound, http.StatusNotFound},
	{InvalidArgument, http.StatusBadRequest},
	{Excluded, http.StatusForbidden},
	{SheddingLoad, http.StatusServiceUnavailable},

	// Since the following aren't HTTP statuses, pick unused codes.
	{HasIncompletePackages, 290},
	{DBModuleInsertInvalid, 480},
	{NotFetched, 481},
	{BadModule, 490},
	{AlternativeModule, 491},
	{ModuleTooLarge, 492},

	{ProxyTimedOut, http.StatusGatewayTimeout},
	// 52x and 54x errors represents modules that need to be reprocessed, and the
	// previous status code the module had. Note that the status code
	// matters for determining reprocessing order.
	{ReprocessStatusOK, 520},
	{ReprocessHasIncompletePackages, 521},
	{ReprocessBadModule, 540},
	{ReprocessAlternative, 541},
	{ReprocessDBModuleInsertInvalid, 542},

	// 60x errors represents errors that occurred when processing a
	// package.
	{PackageBuildContextNotSupported, 600},
	{PackageMaxImportsLimitExceeded, 601},
	{PackageMaxFileSizeLimitExceeded, 602},
	{PackageDocumentationHTMLTooLarge, 603},
	{PackageInvalidContents, 604},
	{PackageBadImportPath, 605},
	}

	// FromStatus generates an error according for the given status code. It uses
	// the given format string and arguments to create the error string according
	// to the fmt package. If format is the empty string, then the error
	// corresponding to the code is returned unwrapped.
	//
	// If code is http.StatusOK, it returns nil.
	func FromStatus(code int, format string, args ...interface{}) error {
	if code == http.StatusOK {
	return nil
	}
	var innerErr = Unknown
	for _, e := range codes {
	if e.code == code {
	innerErr = e.err
	break
	}
	}
	if format == "" {
	return innerErr
	}
	return fmt.Errorf(format+": %w", append(args, innerErr)...)
	}

	// ToStatus returns a status code corresponding to err.
	func ToStatus(err error) int {
	if err == nil {
	return http.StatusOK
	}
	for _, e := range codes {
	if errors.Is(err, e.err) {
	return e.code
	}
	}
	return http.StatusInternalServerError
	}

	// ToReprocessStatus returns the reprocess status code corresponding to the
	// provided status.
	func ToReprocessStatus(status int) int {
	switch status {
	case http.StatusOK:
	return ToStatus(ReprocessStatusOK)
	case ToStatus(HasIncompletePackages):
	return ToStatus(ReprocessHasIncompletePackages)
	case ToStatus(BadModule):
	return ToStatus(ReprocessBadModule)
	case ToStatus(AlternativeModule):
	return ToStatus(ReprocessAlternative)
	case ToStatus(DBModuleInsertInvalid):
	return ToStatus(ReprocessDBModuleInsertInvalid)
	default:
	return status
	}
	}

	// Add adds context to the error.
	// The result cannot be unwrapped to recover the original error.
	// It does nothing when *errp == nil.
	//
	// Example:
	//
	// defer derrors.Add(&err, "copy(%s, %s)", src, dst)
	//
	// See Wrap for an equivalent function that allows
	// the result to be unwrapped.
	func Add(errp *error, format string, args ...interface{}) {
	if *errp != nil {
	errp = fmt.Errorf("%s: %v", fmt.Sprintf(format, args...), errp)
	}
	}

	// Wrap adds context to the error and allows
	// unwrapping the result to recover the original error.
	//
	// Example:
	//
	// defer derrors.Wrap(&err, "copy(%s, %s)", src, dst)
	//
	// See Add for an equivalent function that does not allow
	// the result to be unwrapped.
	func Wrap(errp *error, format string, args ...interface{}) {
	if *errp != nil {
	errp = fmt.Errorf("%s: %w", fmt.Sprintf(format, args...), errp)
	}
	}