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util/router: update

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Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>
This commit is contained in:
Василий Толстов 2021-07-30 14:11:41 +03:00
parent cfd2d53a79
commit f40b974450
6 changed files with 124 additions and 72 deletions
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35
util/router/compile.go
View File

@ -8,18 +8,18 @@ const (
// Template is a compiled representation of path templates.
type Template struct {
// Verb is a VERB part in the template
Verb string
// Original template (example: /v1/a_bit_of_everything)
Template string
// OpCodes is a sequence of operations
// Version is the version number of the format.
Version int
// OpCodes is a sequence of operations.
OpCodes []int
// Pool is a constant pool
Pool []string
// Fields is a list of field paths bound in this template
// Verb is a VERB part in the template.
Verb string
// Fields is a list of field paths bound in this template.
Fields []string
// Version is the version number of the format
Version int
// Original template (example: /v1/a_bit_of_everything)
Template string
}
// Compiler compiles utilities representation of path templates into marshallable operations.
@ -29,9 +29,15 @@ type Compiler interface {
}
type op struct {
str string
code OpCode
operand int
// code is the opcode of the operation
code utilities.OpCode
// str is a string operand of the code.
// num is ignored if str is not empty.
str string
// num is a numeric operand of the code.
num int
}
func (w wildcard) compile() []op {
@ -77,7 +83,6 @@ func (t template) Compile() Template {
rawOps = append(rawOps, s.compile()...)
}
// ops := make([]int, 0, len(rawOps))
var (
ops []int
pool []string
@ -87,8 +92,12 @@ func (t template) Compile() Template {
for _, op := range rawOps {
ops = append(ops, int(op.code))
if op.str == "" {
ops = append(ops, op.operand)
ops = append(ops, op.num)
} else {
// eof segment literal represents the "/" path pattern
if op.str == eof {
op.str = ""
}
if _, ok := consts[op.str]; !ok {
consts[op.str] = len(pool)
pool = append(pool, op.str)

7
util/router/compile_test.go
View File

@ -21,6 +21,13 @@ func TestCompile(t *testing.T) {
fields []string
}{
{},
{
segs: []segment{
literal(eof),
},
ops: []int{int(utilities.OpLitPush), 0},
pool: []string{""},
},
{
segs: []segment{
wildcard{},

41
util/router/parse.go
View File

@ -83,8 +83,30 @@ func tokenize(path string) (tokens []string, verb string) {
}
l := len(tokens)
// See
// https://github.com/grpc-ecosystem/grpc-gateway/pull/1947#issuecomment-774523693 ;
// although normal and backwards-compat logic here is to use the last index
// of a colon, if the final segment is a variable followed by a colon, the
// part following the colon must be a verb. Hence if the previous token is
// an end var marker, we switch the index we're looking for to Index instead
// of LastIndex, so that we correctly grab the remaining part of the path as
// the verb.
var penultimateTokenIsEndVar bool
switch l {
case 0, 1:
// Not enough to be variable so skip this logic and don't result in an
// invalid index
default:
penultimateTokenIsEndVar = tokens[l-2] == "}"
}
t := tokens[l-1]
if idx := strings.LastIndex(t, ":"); idx == 0 {
var idx int
if penultimateTokenIsEndVar {
idx = strings.Index(t, ":")
} else {
idx = strings.LastIndex(t, ":")
}
if idx == 0 {
tokens, verb = tokens[:l-1], t[1:]
} else if idx > 0 {
tokens[l-1], verb = t[:idx], t[idx+1:]
@ -101,22 +123,17 @@ type parser struct {
// topLevelSegments is the target of this parser.
func (p *parser) topLevelSegments() ([]segment, error) {
if logger.V(logger.TraceLevel) {
logger.Trace(context.TODO(), "Parsing %q", p.tokens)
if _, err := p.accept(typeEOF); err == nil {
p.tokens = p.tokens[:0]
return []segment{literal(eof)}, nil
}
segs, err := p.segments()
if err != nil {
return nil, err
}
if logger.V(logger.TraceLevel) {
logger.Trace(context.TODO(), "accept segments: %q; %q", p.accepted, p.tokens)
}
if _, err := p.accept(typeEOF); err != nil {
return nil, fmt.Errorf("unexpected token %q after segments %q", p.tokens[0], strings.Join(p.accepted, ""))
}
if logger.V(logger.TraceLevel) {
logger.Trace(context.TODO(), "accept eof: %q; %q", p.accepted, p.tokens)
}
return segs, nil
}
@ -126,9 +143,6 @@ func (p *parser) segments() ([]segment, error) {
return nil, err
}
if logger.V(logger.TraceLevel) {
logger.Trace(context.TODO(), "accept segment: %q; %q", p.accepted, p.tokens)
}
segs := []segment{s}
for {
if _, err := p.accept("/"); err != nil {
@ -139,9 +153,6 @@ func (p *parser) segments() ([]segment, error) {
return segs, err
}
segs = append(segs, s)
if logger.V(logger.TraceLevel) {
logger.Trace(context.TODO(), "accept segment: %q; %q", p.accepted, p.tokens)
}
}
}

75
util/router/parse_test.go
View File

@ -16,6 +16,7 @@ func TestTokenize(t *testing.T) {
for _, spec := range []struct {
src string
tokens []string
verb string
}{
{
src: "",
@ -84,6 +85,26 @@ func TestTokenize(t *testing.T) {
eof,
},
},
{
src: "v1/a/{endpoint}:a",
tokens: []string{
"v1", "/",
"a", "/",
"{", "endpoint", "}",
eof,
},
verb: "a",
},
{
src: "v1/a/{endpoint}:b:c",
tokens: []string{
"v1", "/",
"a", "/",
"{", "endpoint", "}",
eof,
},
verb: "b:c",
},
} {
tokens, verb := tokenize(spec.src)
if got, want := tokens, spec.tokens; !reflect.DeepEqual(got, want) {
@ -93,23 +114,52 @@ func TestTokenize(t *testing.T) {
t.Errorf("tokenize(%q) = _, %q; want _, %q", spec.src, got, want)
}
src := fmt.Sprintf("%s:%s", spec.src, "LOCK")
tokens, verb = tokenize(src)
if got, want := tokens, spec.tokens; !reflect.DeepEqual(got, want) {
t.Errorf("tokenize(%q) = %q, _; want %q, _", src, got, want)
}
if got, want := verb, "LOCK"; got != want {
t.Errorf("tokenize(%q) = _, %q; want _, %q", src, got, want)
switch {
case spec.verb != "":
if got, want := verb, spec.verb; !reflect.DeepEqual(got, want) {
t.Errorf("tokenize(%q) = %q, _; want %q, _", spec.src, got, want)
}
default:
if got, want := verb, ""; got != want {
t.Errorf("tokenize(%q) = _, %q; want _, %q", spec.src, got, want)
}
src := fmt.Sprintf("%s:%s", spec.src, "LOCK")
tokens, verb = tokenize(src)
if got, want := tokens, spec.tokens; !reflect.DeepEqual(got, want) {
t.Errorf("tokenize(%q) = %q, _; want %q, _", src, got, want)
}
if got, want := verb, "LOCK"; got != want {
t.Errorf("tokenize(%q) = _, %q; want _, %q", src, got, want)
}
}
}
}
func TestParseSegments(t *testing.T) {
flag.Set("v", "3")
err := flag.Set("v", "3")
if err != nil {
t.Fatalf("failed to set flag: %v", err)
}
for _, spec := range []struct {
tokens []string
want []segment
}{
{
tokens: []string{eof},
want: []segment{
literal(eof),
},
},
{
// Note: this case will never arise as tokenize() will never return such a sequence of tokens
// and even if it does it will be treated as [eof]
tokens: []string{eof, "v1", eof},
want: []segment{
literal(eof),
},
},
{
tokens: []string{"v1", eof},
want: []segment{
@ -251,7 +301,10 @@ func TestParseSegments(t *testing.T) {
}
func TestParseSegmentsWithErrors(t *testing.T) {
flag.Set("v", "3")
err := flag.Set("v", "3")
if err != nil {
t.Fatalf("failed to set flag: %v", err)
}
for _, spec := range []struct {
tokens []string
}{
@ -275,10 +328,6 @@ func TestParseSegmentsWithErrors(t *testing.T) {
// invalid percent-encoding
tokens: []string{"a%2z", eof},
},
{
// empty segments
tokens: []string{eof},
},
{
// unterminated variable
tokens: []string{"{", "name", eof},

36
util/router/runtime.go
View File

@ -23,9 +23,9 @@ type rop struct {
operand int
}
// Pattern is a template pattern of http request paths defined in github.com/googleapis/googleapis/google/api/http.proto.
// Pattern is a template pattern of http request paths defined in
// https://github.com/googleapis/googleapis/blob/master/google/api/http.proto
type Pattern struct {
verb string
// ops is a list of operations
ops []rop
// pool is a constant pool indexed by the operands or vars
@ -36,32 +36,16 @@ type Pattern struct {
stacksize int
// tailLen is the length of the fixed-size segments after a deep wildcard
tailLen int
// assumeColonVerb indicates whether a path suffix after a final
// colon may only be interpreted as a verb.
assumeColonVerb bool
// verb is the VERB part of the path pattern. It is empty if the pattern does not have VERB part.
verb string
}
type patternOptions struct {
assumeColonVerb bool
}
// PatternOpt is an option for creating Patterns.
type PatternOpt func(*patternOptions)
// NewPattern returns a new Pattern from the given definition values.
// "ops" is a sequence of op codes. "pool" is a constant pool.
// "verb" is the verb part of the pattern. It is empty if the pattern does not have the part.
// "version" must be 1 for now.
// It returns an error if the given definition is invalid.
//nolint:gocyclo
func NewPattern(version int, ops []int, pool []string, verb string, opts ...PatternOpt) (Pattern, error) {
options := patternOptions{
assumeColonVerb: true,
}
for _, o := range opts {
o(&options)
}
func NewPattern(version int, ops []int, pool []string, verb string) (Pattern, error) {
if version != 1 {
if logger.V(logger.TraceLevel) {
logger.Trace(context.TODO(), "unsupported version: %d", version)
@ -185,7 +169,7 @@ func MustPattern(p Pattern, err error) Pattern {
//nolint:gocyclo
func (p Pattern) Match(components []string, verb string) (map[string]string, error) {
if p.verb != verb {
if p.assumeColonVerb || p.verb != "" {
if p.verb != "" {
return nil, ErrNotMatch
}
if len(components) == 0 {
@ -274,11 +258,3 @@ func (p Pattern) String() string {
}
return "/" + segs
}
// AssumeColonVerbOpt indicates whether a path suffix after a final
// colon may only be interpreted as a verb.
func AssumeColonVerbOpt(val bool) PatternOpt {
return PatternOpt(func(o *patternOptions) {
o.assumeColonVerb = val
})
}

2
util/router/types.go
View File

@ -8,9 +8,9 @@ import (
)
type template struct {
segments []segment
verb string
template string
segments []segment
}
type segment interface {