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vweb: refactor routing logic (#9025)

pull/9036/head
Miccah 2021-03-01 04:50:52 -06:00 committed by GitHub
parent 8045395cbd
commit d0fab60981
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GPG Key ID: 4AEE18F83AFDEB23
6 changed files with 434 additions and 178 deletions
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5
cmd/tools/vtest-self.v
View File

@ -19,6 +19,7 @@ const (
'vlib/v/tests/orm_sub_struct_test.v',
'vlib/vweb/tests/vweb_test.v',
'vlib/vweb/request_test.v',
'vlib/vweb/route_test.v',
'vlib/x/websocket/websocket_test.v',
]
skip_with_fsanitize_address = [
@ -138,6 +139,7 @@ const (
'vlib/v/tests/working_with_an_empty_struct_test.v',
'vlib/vweb/tests/vweb_test.v',
'vlib/vweb/request_test.v',
'vlib/vweb/route_test.v',
'vlib/x/json2/any_test.v',
'vlib/x/json2/decoder_test.v',
'vlib/x/json2/json2_test.v',
@ -312,6 +314,7 @@ const (
'vlib/v/vcache/vcache_test.v',
'vlib/vweb/tests/vweb_test.v',
'vlib/vweb/request_test.v',
'vlib/vweb/route_test.v',
'vlib/v/compiler_errors_test.v',
'vlib/v/tests/map_enum_keys_test.v',
'vlib/v/tests/tmpl_test.v',
@ -341,6 +344,7 @@ const (
'vlib/clipboard/clipboard_test.v',
'vlib/vweb/tests/vweb_test.v',
'vlib/vweb/request_test.v',
'vlib/vweb/route_test.v',
'vlib/x/websocket/websocket_test.v',
'vlib/net/http/http_httpbin_test.v',
'vlib/net/http/header_test.v',
@ -357,6 +361,7 @@ const (
'vlib/x/websocket/websocket_test.v',
'vlib/vweb/tests/vweb_test.v',
'vlib/vweb/request_test.v',
'vlib/vweb/route_test.v',
]
skip_on_non_windows = []string{}
skip_on_macos = []string{}

7
examples/vweb/vweb_example.v
View File

@ -1,6 +1,7 @@
module main
import vweb
import rand
const (
port = 8082
@ -21,8 +22,10 @@ pub fn (mut app App) init_once() {
app.handle_static('.', false)
}
pub fn (mut app App) json_endpoint() vweb.Result {
return app.json('{"a": 3}')
['/users/:user']
pub fn (mut app App) user_endpoint(user string) vweb.Result {
id := rand.intn(100)
return app.json('{"$user": $id}')
}
pub fn (mut app App) index() vweb.Result {

5
vlib/net/http/header.v
View File

@ -419,6 +419,11 @@ pub fn (h Header) values_str(key string) []string {
return h.data[k]
}
// Gets all header keys as strings
pub fn (h Header) keys() []string {
return h.data.keys()
}
// Validate and canonicalize an HTTP header key
// A canonical header is all lowercase except for the first character
// and any character after a `-`. Example: `Example-Header-Key`

32
vlib/vweb/request.v
View File

@ -10,26 +10,28 @@ pub fn parse_request(mut reader io.BufferedReader) ?http.Request {
method, target, version := parse_request_line(line) ?
// headers
mut headers := map[string][]string{}
mut h := http.new_header()
line = reader.read_line() ?
for line != '' {
key, values := parse_header(line) ?
headers[key] << values
key, value := parse_header(line) ?
h.add_str(key, value) ?
line = reader.read_line() ?
}
mut http_headers := map[string]string{}
mut http_lheaders := map[string]string{}
for k, v in headers {
values := v.join('; ')
http_headers[k] = values
http_lheaders[k.to_lower()] = values
// create map[string]string from headers
// TODO: replace headers and lheaders with http.Header type
mut headers := map[string]string{}
mut lheaders := map[string]string{}
for key in h.keys() {
values := h.values_str(key).join('; ')
headers[key] = values
lheaders[key.to_lower()] = values
}
// body
mut body := [byte(0)]
if 'content-length' in http_lheaders {
n := http_lheaders['content-length'].int()
if length := h.get(.content_length) {
n := length.int()
body = []byte{len: n, cap: n + 1}
reader.read(mut body) or { }
body << 0
@ -38,8 +40,8 @@ pub fn parse_request(mut reader io.BufferedReader) ?http.Request {
return http.Request{
method: method
url: target.str()
headers: http_headers
lheaders: http_lheaders
headers: headers
lheaders: lheaders
data: string(body)
version: version
}
@ -60,7 +62,7 @@ fn parse_request_line(s string) ?(http.Method, urllib.URL, http.Version) {
return method, target, version
}
fn parse_header(s string) ?(string, []string) {
fn parse_header(s string) ?(string, string) {
if ':' !in s {
return error('missing colon in header')
}
@ -69,7 +71,7 @@ fn parse_header(s string) ?(string, []string) {
return error('invalid character in header name')
}
// TODO: parse quoted text according to the RFC
return words[0], words[1].trim_left(' \t').split(';').map(it.trim_space())
return words[0], words[1].trim_left(' \t')
}
// TODO: use map for faster lookup (untested)

263
vlib/vweb/route_test.v 100644
View File

@ -0,0 +1,263 @@
module vweb
struct RoutePair {
url string
route string
}
fn (rp RoutePair) test() ?[]string {
url := rp.url.split('/').filter(it != '')
route := rp.route.split('/').filter(it != '')
return route_matches(url, route)
}
fn (rp RoutePair) test_match() {
rp.test() or { panic('should match: $rp') }
}
fn (rp RoutePair) test_no_match() {
rp.test() or { return }
panic('should not match: $rp')
}
fn (rp RoutePair) test_param(expected []string) {
res := rp.test() or { panic('should match: $rp') }
assert res == expected
}
fn test_route_no_match() {
tests := [
RoutePair{
url: '/a'
route: '/a/b/c'
},
RoutePair{
url: '/a/'
route: '/a/b/c'
},
RoutePair{
url: '/a/b'
route: '/a/b/c'
},
RoutePair{
url: '/a/b/'
route: '/a/b/c'
},
RoutePair{
url: '/a/c/b'
route: '/a/b/c'
},
RoutePair{
url: '/a/c/b/'
route: '/a/b/c'
},
RoutePair{
url: '/a/b/c/d'
route: '/a/b/c'
},
]
for test in tests {
test.test_no_match()
}
}
fn test_route_exact_match() {
tests := [
RoutePair{
url: '/a/b/c'
route: '/a/b/c'
},
RoutePair{
url: '/a/b/c/'
route: '/a/b/c'
},
RoutePair{
url: '/a'
route: '/a'
},
RoutePair{
url: '/'
route: '/'
},
]
for test in tests {
test.test_match()
}
}
fn test_route_params_match() {
RoutePair{
url: '/a/b/c'
route: '/:a/b/c'
}.test_match()
RoutePair{
url: '/a/b/c'
route: '/a/:b/c'
}.test_match()
RoutePair{
url: '/a/b/c'
route: '/a/b/:c'
}.test_match()
RoutePair{
url: '/a/b/c'
route: '/:a/b/:c'
}.test_match()
RoutePair{
url: '/a/b/c'
route: '/:a/:b/:c'
}.test_match()
RoutePair{
url: '/one/two/three'
route: '/:a/:b/:c'
}.test_match()
RoutePair{
url: '/one/b/c'
route: '/:a/b/c'
}.test_match()
RoutePair{
url: '/one/two/three'
route: '/:a/b/c'
}.test_no_match()
RoutePair{
url: '/one/two/three'
route: '/:a/:b/c'
}.test_no_match()
RoutePair{
url: '/one/two/three'
route: '/:a/b/:c'
}.test_no_match()
RoutePair{
url: '/a/b/c/d'
route: '/:a/:b/:c'
}.test_no_match()
RoutePair{
url: '/1/2/3/4'
route: '/:a/:b/:c'
}.test_no_match()
RoutePair{
url: '/a/b'
route: '/:a/:b/:c'
}.test_no_match()
RoutePair{
url: '/1/2'
route: '/:a/:b/:c'
}.test_no_match()
}
fn test_route_params() {
RoutePair{
url: '/a/b/c'
route: '/:a/b/c'
}.test_param(['a'])
RoutePair{
url: '/one/b/c'
route: '/:a/b/c'
}.test_param(['one'])
RoutePair{
url: '/one/two/c'
route: '/:a/:b/c'
}.test_param(['one', 'two'])
RoutePair{
url: '/one/two/three'
route: '/:a/:b/:c'
}.test_param(['one', 'two', 'three'])
RoutePair{
url: '/one/b/three'
route: '/:a/b/:c'
}.test_param(['one', 'three'])
}
fn test_route_params_array_match() {
// array can only be used on the last word (TODO: add parsing / tests to ensure this)
RoutePair{
url: '/a/b/c'
route: '/a/b/:c...'
}.test_match()
RoutePair{
url: '/a/b/c/d'
route: '/a/b/:c...'
}.test_match()
RoutePair{
url: '/a/b/c/d/e'
route: '/a/b/:c...'
}.test_match()
RoutePair{
url: '/one/b/c/d/e'
route: '/:a/b/:c...'
}.test_match()
RoutePair{
url: '/one/two/c/d/e'
route: '/:a/:b/:c...'
}.test_match()
RoutePair{
url: '/one/two/three/four/five'
route: '/:a/:b/:c...'
}.test_match()
RoutePair{
url: '/a/b'
route: '/:a/:b/:c...'
}.test_no_match()
RoutePair{
url: '/a/b/'
route: '/:a/:b/:c...'
}.test_no_match()
}
fn test_route_params_array() {
RoutePair{
url: '/a/b/c'
route: '/a/b/:c...'
}.test_param(['c'])
RoutePair{
url: '/a/b/c/d'
route: '/a/b/:c...'
}.test_param(['c/d'])
RoutePair{
url: '/a/b/c/d/'
route: '/a/b/:c...'
}.test_param(['c/d'])
RoutePair{
url: '/a/b/c/d/e'
route: '/a/b/:c...'
}.test_param(['c/d/e'])
RoutePair{
url: '/one/b/c/d/e'
route: '/:a/b/:c...'
}.test_param(['one', 'c/d/e'])
RoutePair{
url: '/one/two/c/d/e'
route: '/:a/:b/:c...'
}.test_param(['one', 'two', 'c/d/e'])
RoutePair{
url: '/one/two/three/d/e'
route: '/:a/:b/:c...'
}.test_param(['one', 'two', 'three/d/e'])
}

284
vlib/vweb/vweb.v
View File

@ -304,7 +304,10 @@ fn handle_conn<T>(mut conn net.TcpConn, mut app T) {
}
mut reader := io.new_buffered_reader(reader: io.make_reader(conn))
page_gen_start := time.ticks()
req := parse_request(mut reader) or { return }
req := parse_request(mut reader) or {
eprintln('error parsing request: $err')
return
}
app.Context = Context{
req: req
conn: conn
@ -326,191 +329,166 @@ fn handle_conn<T>(mut conn net.TcpConn, mut app T) {
}
}
// Serve a static file if it is one
// TODO: handle url parameters properly - for now, ignore them
mut static_file_name := app.req.url
// TODO: use urllib methods instead of manually parsing
if static_file_name.contains('?') {
static_file_name = static_file_name.all_before('?')
}
static_file := app.static_files[static_file_name]
mime_type := app.static_mime_types[static_file_name]
if static_file != '' && mime_type != '' {
data := os.read_file(static_file) or {
send_string(mut conn, vweb.http_404) or { }
// TODO: get the real path
url := urllib.parse(app.req.url.to_lower()) or {
eprintln('error parsing path: $err')
return
}
app.send_response_to_client(mime_type, data)
unsafe { data.free() }
if serve_static<T>(mut app, url) {
// successfully served a static file
return
}
app.init()
// Call the right action
$if debug {
println('route matching...')
}
mut route_words_a := [][]string{}
// TODO: use urllib methods instead of manually parsing
mut url_words := req.url.split('/').filter(it != '')
// Parse URL query
if url_words.len > 0 && url_words.last().contains('?') {
words := url_words.last().after('?').split('&')
tmp_query := words.map(it.split('='))
url_words[url_words.len - 1] = url_words.last().all_before('?')
for data in tmp_query {
if data.len == 2 {
app.query[data[0]] = data[1]
url_words := url.path.split('/').filter(it != '')
// copy query args to app.query
for k, v in url.query().data {
app.query[k] = v.data[0]
}
}
}
mut vars := []string{cap: route_words_a.len}
mut action := ''
$for method in T.methods {
$if method.return_type is Result {
attrs := method.attrs
route_words_a = [][]string{}
// Get methods
// Get is default
mut req_method_str := '$req.method'
if req.method == .post {
if 'post' in attrs {
route_words_a = attrs.filter(it.to_lower() != 'post').map(it[1..].split('/'))
mut method_args := []string{}
// TODO: move to server start
http_methods, route_path := parse_attrs(method.name, method.attrs) or {
eprintln('error parsing method attributes: $err')
return
}
} else if req.method == .put {
if 'put' in attrs {
route_words_a = attrs.filter(it.to_lower() != 'put').map(it[1..].split('/'))
}
} else if req.method == .patch {
if 'patch' in attrs {
route_words_a = attrs.filter(it.to_lower() != 'patch').map(it[1..].split('/'))
}
} else if req.method == .delete {
if 'delete' in attrs {
route_words_a = attrs.filter(it.to_lower() != 'delete').map(it[1..].split('/'))
}
} else if req.method == .head {
if 'head' in attrs {
route_words_a = attrs.filter(it.to_lower() != 'head').map(it[1..].split('/'))
}
} else if req.method == .options {
if 'options' in attrs {
route_words_a = attrs.filter(it.to_lower() != 'options').map(it[1..].split('/'))
}
} else {
route_words_a = attrs.filter(it.to_lower() != 'get').map(it[1..].split('/'))
}
if attrs.len == 0 || (attrs.len == 1 && route_words_a.len == 0) {
if url_words.len > 0 {
// No routing for this method. If it matches, call it and finish matching
// since such methods have a priority.
// Used for route matching
route_words := route_path.split('/').filter(it != '')
// Skip if the HTTP request method does not match the attributes
if app.req.method in http_methods {
// Route immediate matches first
// For example URL `/register` matches route `/:user`, but `fn register()`
// should be called first.
if (req_method_str == '' && url_words[0] == method.name && url_words.len == 1)
|| (req_method_str == req.method.str() && url_words[0] == method.name
&& url_words.len == 1) {
$if debug {
println('easy match method=$method.name')
}
app.$method(vars)
if !route_path.contains('/:') && url_words == route_words {
// We found a match
app.$method(method_args)
return
}
} else if method.name == 'index' {
// handle / to .index()
$if debug {
println('route to .index()')
}
app.$method(vars)
if url_words.len == 0 && route_words == ['index'] && method.name == 'index' {
app.$method(method_args)
return
}
} else {
mut req_method := []string{}
if route_words_a.len > 0 {
for route_words_ in route_words_a {
// cannot move to line initialize line because of C error with map(it.filter(it != ''))
route_words := route_words_.filter(it != '')
if route_words.len == 1 && route_words[0] in vweb.methods_without_first {
req_method << route_words[0]
}
if url_words.len == route_words.len || (url_words.len >= route_words.len - 1
&& route_words.len > 0 && route_words.last().ends_with('...')) {
if req_method.len > 0 {
if req_method_str.to_lower()[1..] !in req_method {
continue
}
}
// match `/:user/:repo/tree` to `/vlang/v/tree`
mut matching := false
mut unknown := false
mut variables := []string{cap: route_words.len}
if route_words.len == 0 && url_words.len == 0 {
// index route
matching = true
}
for i in 0 .. route_words.len {
if url_words.len == i {
variables << ''
matching = true
unknown = true
break
}
if url_words[i] == route_words[i] {
// no parameter
matching = true
continue
} else if route_words[i].starts_with(':') {
// is parameter
if i < route_words.len && !route_words[i].ends_with('...') {
// normal parameter
variables << url_words[i]
} else {
// array parameter only in the end
variables << url_words[i..].join('/')
}
matching = true
unknown = true
continue
} else {
matching = false
break
}
}
if matching && !unknown {
// absolute router words like `/test/site`
app.$method(vars)
if params := route_matches(url_words, route_words) {
method_args = params.clone()
if method_args.len != method.args.len {
eprintln('warning: uneven parameters count ($method.args.len) in `$method.name`, compared to the vweb route `$method.attrs` ($method_args.len)')
}
app.$method(method_args)
return
} else if matching && unknown {
// router words with paramter like `/:test/site`
action = method.name
vars = variables.clone()
}
req_method = []string{}
}
}
}
}
}
}
if action == '' {
// site not found
send_string(mut conn, vweb.http_404) or { }
return
}
$for method in T.methods {
$if method.return_type is Result {
// search again for method
if action == method.name && method.attrs.len > 0 {
// call action method
if method.args.len == vars.len {
app.$method(vars)
return
} else {
eprintln('warning: uneven parameters count ($method.args.len) in `$method.name`, compared to the vweb route `$method.attrs` ($vars.len)')
fn route_matches(url_words []string, route_words []string) ?[]string {
// URL path should be at least as long as the route path
if url_words.len < route_words.len {
return none
}
mut params := []string{cap: url_words.len}
if url_words.len == route_words.len {
for i in 0 .. url_words.len {
if route_words[i].starts_with(':') {
// We found a path paramater
params << url_words[i]
} else if route_words[i] != url_words[i] {
// This url does not match the route
return none
}
}
return params
}
// The last route can end with ... indicating an array
if !route_words[route_words.len - 1].ends_with('...') {
return none
}
for i in 0 .. route_words.len - 1 {
if route_words[i].starts_with(':') {
// We found a path paramater
params << url_words[i]
} else if route_words[i] != url_words[i] {
// This url does not match the route
return none
}
}
params << url_words[route_words.len - 1..url_words.len].join('/')
return params
}
// parse function attribute list for methods and a path
fn parse_attrs(name string, attrs []string) ?([]http.Method, string) {
if attrs.len == 0 {
return [http.Method.get], '/$name'
}
mut x := attrs.clone()
mut methods := []http.Method{}
mut path := ''
for i := 0; i < x.len; {
attr := x[i]
attru := attr.to_upper()
m := http.method_from_str(attru)
if attru == 'GET' || m != .get {
methods << m
x.delete(i)
continue
}
if attr.starts_with('/') {
if path != '' {
return error('Expected at most one path attribute')
}
path = attr
x.delete(i)
continue
}
i++
}
if x.len > 0 {
return error('Encountered unexpected extra attributes: $x')
}
if methods.len == 0 {
methods = [http.Method.get]
}
if path == '' {
path = '/$name'
}
// Make path lowercase for case-insensitive comparisons
return methods, path.to_lower()
}
// check if request is for a static file and serves it
// returns true if we served a static file, false otherwise
fn serve_static<T>(mut app T, url urllib.URL) bool {
// TODO: handle url parameters properly - for now, ignore them
static_file := app.static_files[url.path]
mime_type := app.static_mime_types[url.path]
if static_file == '' || mime_type == '' {
return false
}
data := os.read_file(static_file) or {
send_string(mut app.conn, vweb.http_404) or { }
return true
}
app.send_response_to_client(mime_type, data)
unsafe { data.free() }
return true
}
// vweb intern function