From d9e12ec6f9a20c27c72f32c5e3488bd35e3efea9 Mon Sep 17 00:00:00 2001 From: Chris O'Haver Date: Thu, 30 May 2019 17:58:30 -0400 Subject: [PATCH] kubernetes/migration: Remove all deps (#178) * remove diff and deps * remove caddy deps, copy stuff locally --- kubernetes/migration/caddy/alltokens.go | 33 +++ kubernetes/migration/caddy/dispenser.go | 260 ++++++++++++++++++ kubernetes/migration/caddy/lexer.go | 150 ++++++++++ kubernetes/migration/corefile/corefile.go | 5 +- .../migration/corefile/corefile_test.go | 30 +- kubernetes/migration/go.mod | 6 - kubernetes/migration/go.sum | 67 ----- kubernetes/migration/migrate_test.go | 5 +- 8 files changed, 463 insertions(+), 93 deletions(-) create mode 100644 kubernetes/migration/caddy/alltokens.go create mode 100644 kubernetes/migration/caddy/dispenser.go create mode 100644 kubernetes/migration/caddy/lexer.go diff --git a/kubernetes/migration/caddy/alltokens.go b/kubernetes/migration/caddy/alltokens.go new file mode 100644 index 0000000..a8fdcab --- /dev/null +++ b/kubernetes/migration/caddy/alltokens.go @@ -0,0 +1,33 @@ +// Copyright 2015 Light Code Labs, LLC +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +package caddy + +import "io" + +// allTokens lexes the entire input, but does not parse it. +// It returns all the tokens from the input, unstructured +// and in order. +func allTokens(input io.Reader) ([]Token, error) { + l := new(lexer) + err := l.load(input) + if err != nil { + return nil, err + } + var tokens []Token + for l.next() { + tokens = append(tokens, l.token) + } + return tokens, nil +} diff --git a/kubernetes/migration/caddy/dispenser.go b/kubernetes/migration/caddy/dispenser.go new file mode 100644 index 0000000..0e12d5b --- /dev/null +++ b/kubernetes/migration/caddy/dispenser.go @@ -0,0 +1,260 @@ +// Copyright 2015 Light Code Labs, LLC +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +package caddy + +import ( + "errors" + "fmt" + "io" + "strings" +) + +// Dispenser is a type that dispenses tokens, similarly to a lexer, +// except that it can do so with some notion of structure and has +// some really convenient methods. +type Dispenser struct { + filename string + tokens []Token + cursor int + nesting int +} + +// NewDispenser returns a Dispenser, ready to use for parsing the given input. +func NewDispenser(filename string, input io.Reader) Dispenser { + tokens, _ := allTokens(input) // ignoring error because nothing to do with it + return Dispenser{ + filename: filename, + tokens: tokens, + cursor: -1, + } +} + +// NewDispenserTokens returns a Dispenser filled with the given tokens. +func NewDispenserTokens(filename string, tokens []Token) Dispenser { + return Dispenser{ + filename: filename, + tokens: tokens, + cursor: -1, + } +} + +// Next loads the next token. Returns true if a token +// was loaded; false otherwise. If false, all tokens +// have been consumed. +func (d *Dispenser) Next() bool { + if d.cursor < len(d.tokens)-1 { + d.cursor++ + return true + } + return false +} + +// NextArg loads the next token if it is on the same +// line. Returns true if a token was loaded; false +// otherwise. If false, all tokens on the line have +// been consumed. It handles imported tokens correctly. +func (d *Dispenser) NextArg() bool { + if d.cursor < 0 { + d.cursor++ + return true + } + if d.cursor >= len(d.tokens) { + return false + } + if d.cursor < len(d.tokens)-1 && + d.tokens[d.cursor].File == d.tokens[d.cursor+1].File && + d.tokens[d.cursor].Line+d.numLineBreaks(d.cursor) == d.tokens[d.cursor+1].Line { + d.cursor++ + return true + } + return false +} + +// NextLine loads the next token only if it is not on the same +// line as the current token, and returns true if a token was +// loaded; false otherwise. If false, there is not another token +// or it is on the same line. It handles imported tokens correctly. +func (d *Dispenser) NextLine() bool { + if d.cursor < 0 { + d.cursor++ + return true + } + if d.cursor >= len(d.tokens) { + return false + } + if d.cursor < len(d.tokens)-1 && + (d.tokens[d.cursor].File != d.tokens[d.cursor+1].File || + d.tokens[d.cursor].Line+d.numLineBreaks(d.cursor) < d.tokens[d.cursor+1].Line) { + d.cursor++ + return true + } + return false +} + +// NextBlock can be used as the condition of a for loop +// to load the next token as long as it opens a block or +// is already in a block. It returns true if a token was +// loaded, or false when the block's closing curly brace +// was loaded and thus the block ended. Nested blocks are +// not supported. +func (d *Dispenser) NextBlock() bool { + if d.nesting > 0 { + d.Next() + if d.Val() == "}" { + d.nesting-- + return false + } + return true + } + if !d.NextArg() { // block must open on same line + return false + } + if d.Val() != "{" { + d.cursor-- // roll back if not opening brace + return false + } + d.Next() + if d.Val() == "}" { + // Open and then closed right away + return false + } + d.nesting++ + return true +} + +// Val gets the text of the current token. If there is no token +// loaded, it returns empty string. +func (d *Dispenser) Val() string { + if d.cursor < 0 || d.cursor >= len(d.tokens) { + return "" + } + return d.tokens[d.cursor].Text +} + +// Line gets the line number of the current token. If there is no token +// loaded, it returns 0. +func (d *Dispenser) Line() int { + if d.cursor < 0 || d.cursor >= len(d.tokens) { + return 0 + } + return d.tokens[d.cursor].Line +} + +// File gets the filename of the current token. If there is no token loaded, +// it returns the filename originally given when parsing started. +func (d *Dispenser) File() string { + if d.cursor < 0 || d.cursor >= len(d.tokens) { + return d.filename + } + if tokenFilename := d.tokens[d.cursor].File; tokenFilename != "" { + return tokenFilename + } + return d.filename +} + +// Args is a convenience function that loads the next arguments +// (tokens on the same line) into an arbitrary number of strings +// pointed to in targets. If there are fewer tokens available +// than string pointers, the remaining strings will not be changed +// and false will be returned. If there were enough tokens available +// to fill the arguments, then true will be returned. +func (d *Dispenser) Args(targets ...*string) bool { + enough := true + for i := 0; i < len(targets); i++ { + if !d.NextArg() { + enough = false + break + } + *targets[i] = d.Val() + } + return enough +} + +// RemainingArgs loads any more arguments (tokens on the same line) +// into a slice and returns them. Open curly brace tokens also indicate +// the end of arguments, and the curly brace is not included in +// the return value nor is it loaded. +func (d *Dispenser) RemainingArgs() []string { + var args []string + + for d.NextArg() { + if d.Val() == "{" { + d.cursor-- + break + } + args = append(args, d.Val()) + } + + return args +} + +// ArgErr returns an argument error, meaning that another +// argument was expected but not found. In other words, +// a line break or open curly brace was encountered instead of +// an argument. +func (d *Dispenser) ArgErr() error { + if d.Val() == "{" { + return d.Err("Unexpected token '{', expecting argument") + } + return d.Errf("Wrong argument count or unexpected line ending after '%s'", d.Val()) +} + +// SyntaxErr creates a generic syntax error which explains what was +// found and what was expected. +func (d *Dispenser) SyntaxErr(expected string) error { + msg := fmt.Sprintf("%s:%d - Syntax error: Unexpected token '%s', expecting '%s'", d.File(), d.Line(), d.Val(), expected) + return errors.New(msg) +} + +// EOFErr returns an error indicating that the dispenser reached +// the end of the input when searching for the next token. +func (d *Dispenser) EOFErr() error { + return d.Errf("Unexpected EOF") +} + +// Err generates a custom parse-time error with a message of msg. +func (d *Dispenser) Err(msg string) error { + msg = fmt.Sprintf("%s:%d - Error during parsing: %s", d.File(), d.Line(), msg) + return errors.New(msg) +} + +// Errf is like Err, but for formatted error messages +func (d *Dispenser) Errf(format string, args ...interface{}) error { + return d.Err(fmt.Sprintf(format, args...)) +} + +// numLineBreaks counts how many line breaks are in the token +// value given by the token index tknIdx. It returns 0 if the +// token does not exist or there are no line breaks. +func (d *Dispenser) numLineBreaks(tknIdx int) int { + if tknIdx < 0 || tknIdx >= len(d.tokens) { + return 0 + } + return strings.Count(d.tokens[tknIdx].Text, "\n") +} + +// isNewLine determines whether the current token is on a different +// line (higher line number) than the previous token. It handles imported +// tokens correctly. If there isn't a previous token, it returns true. +func (d *Dispenser) isNewLine() bool { + if d.cursor < 1 { + return true + } + if d.cursor > len(d.tokens)-1 { + return false + } + return d.tokens[d.cursor-1].File != d.tokens[d.cursor].File || + d.tokens[d.cursor-1].Line+d.numLineBreaks(d.cursor-1) < d.tokens[d.cursor].Line +} diff --git a/kubernetes/migration/caddy/lexer.go b/kubernetes/migration/caddy/lexer.go new file mode 100644 index 0000000..4114db9 --- /dev/null +++ b/kubernetes/migration/caddy/lexer.go @@ -0,0 +1,150 @@ +// Copyright 2015 Light Code Labs, LLC +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +package caddy + +import ( + "bufio" + "io" + "unicode" +) + +type ( + // lexer is a utility which can get values, token by + // token, from a Reader. A token is a word, and tokens + // are separated by whitespace. A word can be enclosed + // in quotes if it contains whitespace. + lexer struct { + reader *bufio.Reader + token Token + line int + } + + // Token represents a single parsable unit. + Token struct { + File string + Line int + Text string + } +) + +// load prepares the lexer to scan an input for tokens. +// It discards any leading byte order mark. +func (l *lexer) load(input io.Reader) error { + l.reader = bufio.NewReader(input) + l.line = 1 + + // discard byte order mark, if present + firstCh, _, err := l.reader.ReadRune() + if err != nil { + return err + } + if firstCh != 0xFEFF { + err := l.reader.UnreadRune() + if err != nil { + return err + } + } + + return nil +} + +// next loads the next token into the lexer. +// A token is delimited by whitespace, unless +// the token starts with a quotes character (") +// in which case the token goes until the closing +// quotes (the enclosing quotes are not included). +// Inside quoted strings, quotes may be escaped +// with a preceding \ character. No other chars +// may be escaped. The rest of the line is skipped +// if a "#" character is read in. Returns true if +// a token was loaded; false otherwise. +func (l *lexer) next() bool { + var val []rune + var comment, quoted, escaped bool + + makeToken := func() bool { + l.token.Text = string(val) + return true + } + + for { + ch, _, err := l.reader.ReadRune() + if err != nil { + if len(val) > 0 { + return makeToken() + } + if err == io.EOF { + return false + } + panic(err) + } + + if quoted { + if !escaped { + if ch == '\\' { + escaped = true + continue + } else if ch == '"' { + quoted = false + return makeToken() + } + } + if ch == '\n' { + l.line++ + } + if escaped { + // only escape quotes + if ch != '"' { + val = append(val, '\\') + } + } + val = append(val, ch) + escaped = false + continue + } + + if unicode.IsSpace(ch) { + if ch == '\r' { + continue + } + if ch == '\n' { + l.line++ + comment = false + } + if len(val) > 0 { + return makeToken() + } + continue + } + + if ch == '#' { + comment = true + } + + if comment { + continue + } + + if len(val) == 0 { + l.token = Token{Line: l.line} + if ch == '"' { + quoted = true + continue + } + } + + val = append(val, ch) + } +} diff --git a/kubernetes/migration/corefile/corefile.go b/kubernetes/migration/corefile/corefile.go index 511df87..e548b6c 100644 --- a/kubernetes/migration/corefile/corefile.go +++ b/kubernetes/migration/corefile/corefile.go @@ -1,8 +1,9 @@ package corefile import ( - "github.com/mholt/caddy" "strings" + + "github.com/coredns/deployment/kubernetes/migration/caddy" ) type Corefile struct { @@ -27,7 +28,7 @@ type Option struct { func New(s string) (*Corefile, error) { c := Corefile{} - cc := caddy.NewTestController("migration", s) + cc := caddy.NewDispenser("migration", strings.NewReader(s)) depth := 0 var cSvr *Server var cPlg *Plugin diff --git a/kubernetes/migration/corefile/corefile_test.go b/kubernetes/migration/corefile/corefile_test.go index d1e67e3..04fcde2 100644 --- a/kubernetes/migration/corefile/corefile_test.go +++ b/kubernetes/migration/corefile/corefile_test.go @@ -40,9 +40,9 @@ func TestCorefile(t *testing.T) { } func TestServer_FindMatch(t *testing.T) { - tests := []struct{ + tests := []struct { server *Server - match bool + match bool }{ {server: &Server{DomPorts: []string{".:53"}}, match: true}, {server: &Server{DomPorts: []string{".:54"}}, match: false}, @@ -67,16 +67,16 @@ func TestServer_FindMatch(t *testing.T) { } func TestPlugin_FindMatch(t *testing.T) { - tests := []struct{ + tests := []struct { plugin *Plugin - match bool + match bool }{ {plugin: &Plugin{Name: "plugin1", Args: []string{}}, match: true}, - {plugin: &Plugin{Name: "plugin2", Args: []string{"1","1.5","2"}}, match: true}, - {plugin: &Plugin{Name: "plugin3", Args: []string{"1","2","3","4"}}, match: true}, + {plugin: &Plugin{Name: "plugin2", Args: []string{"1", "1.5", "2"}}, match: true}, + {plugin: &Plugin{Name: "plugin3", Args: []string{"1", "2", "3", "4"}}, match: true}, {plugin: &Plugin{Name: "plugin1", Args: []string{"a"}}, match: false}, - {plugin: &Plugin{Name: "plugin2", Args: []string{"1","1.5","b"}}, match: false}, - {plugin: &Plugin{Name: "plugin3", Args: []string{"a","2","3","4"}}, match: false}, + {plugin: &Plugin{Name: "plugin2", Args: []string{"1", "1.5", "b"}}, match: false}, + {plugin: &Plugin{Name: "plugin3", Args: []string{"a", "2", "3", "4"}}, match: false}, {plugin: &Plugin{Name: "plugin4", Args: []string{}}, match: false}, } @@ -94,16 +94,16 @@ func TestPlugin_FindMatch(t *testing.T) { } func TestOption_FindMatch(t *testing.T) { - tests := []struct{ + tests := []struct { option *Plugin - match bool + match bool }{ {option: &Plugin{Name: "option1", Args: []string{}}, match: true}, - {option: &Plugin{Name: "option2", Args: []string{"1","1.5","2"}}, match: true}, - {option: &Plugin{Name: "option3", Args: []string{"1","2","3","4"}}, match: true}, + {option: &Plugin{Name: "option2", Args: []string{"1", "1.5", "2"}}, match: true}, + {option: &Plugin{Name: "option3", Args: []string{"1", "2", "3", "4"}}, match: true}, {option: &Plugin{Name: "option1", Args: []string{"a"}}, match: false}, - {option: &Plugin{Name: "option2", Args: []string{"1","1.5","b"}}, match: false}, - {option: &Plugin{Name: "option3", Args: []string{"a","2","3","4"}}, match: false}, + {option: &Plugin{Name: "option2", Args: []string{"1", "1.5", "b"}}, match: false}, + {option: &Plugin{Name: "option3", Args: []string{"a", "2", "3", "4"}}, match: false}, {option: &Plugin{Name: "option4", Args: []string{}}, match: false}, } @@ -118,4 +118,4 @@ func TestOption_FindMatch(t *testing.T) { t.Errorf("In test #%v, expected match to be %v but got %v.", i, test.match, match) } } -} \ No newline at end of file +} diff --git a/kubernetes/migration/go.mod b/kubernetes/migration/go.mod index 95244cc..3e424a4 100644 --- a/kubernetes/migration/go.mod +++ b/kubernetes/migration/go.mod @@ -1,9 +1,3 @@ module github.com/coredns/deployment/kubernetes/migration go 1.12 - -require ( - github.com/andreyvit/diff v0.0.0-20170406064948-c7f18ee00883 - github.com/mholt/caddy v1.0.0 - github.com/sergi/go-diff v1.0.0 // indirect -) diff --git a/kubernetes/migration/go.sum b/kubernetes/migration/go.sum index 5a5ac5a..e69de29 100644 --- a/kubernetes/migration/go.sum +++ b/kubernetes/migration/go.sum @@ -1,67 +0,0 @@ -github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= -github.com/andreyvit/diff v0.0.0-20170406064948-c7f18ee00883 h1:bvNMNQO63//z+xNgfBlViaCIJKLlCJ6/fmUseuG0wVQ= -github.com/andreyvit/diff v0.0.0-20170406064948-c7f18ee00883/go.mod h1:rCTlJbsFo29Kk6CurOXKm700vrz8f0KW0JNfpkRJY/8= -github.com/bifurcation/mint v0.0.0-20180715133206-93c51c6ce115/go.mod h1:zVt7zX3K/aDCk9Tj+VM7YymsX66ERvzCJzw8rFCX2JU= -github.com/cenkalti/backoff v2.1.1+incompatible/go.mod h1:90ReRw6GdpyfrHakVjL/QHaoyV4aDUVVkXQJJJ3NXXM= -github.com/cheekybits/genny v0.0.0-20170328200008-9127e812e1e9/go.mod h1:+tQajlRqAUrPI7DOSpB0XAqZYtQakVtB7wXkRAgjxjQ= -github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8= -github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= -github.com/dustin/go-humanize v1.0.0/go.mod h1:HtrtbFcZ19U5GC7JDqmcUSB87Iq5E25KnS6fMYU6eOk= -github.com/flynn/go-shlex v0.0.0-20150515145356-3f9db97f8568 h1:BHsljHzVlRcyQhjrss6TZTdY2VfCqZPbv5k3iBFa2ZQ= -github.com/flynn/go-shlex v0.0.0-20150515145356-3f9db97f8568/go.mod h1:xEzjJPgXI435gkrCt3MPfRiAkVrwSbHsst4LCFVfpJc= -github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo= -github.com/go-acme/lego v2.5.0+incompatible/go.mod h1:yzMNe9CasVUhkquNvti5nAtPmG94USbYxYrZfTkIn0M= -github.com/golang/mock v1.2.0/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A= -github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U= -github.com/google/uuid v1.1.1 h1:Gkbcsh/GbpXz7lPftLA3P6TYMwjCLYm83jiFQZF/3gY= -github.com/google/uuid v1.1.1/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo= -github.com/gorilla/websocket v1.4.0/go.mod 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a/kubernetes/migration/migrate_test.go b/kubernetes/migration/migrate_test.go index 689eeeb..7cc78b6 100644 --- a/kubernetes/migration/migrate_test.go +++ b/kubernetes/migration/migrate_test.go @@ -1,7 +1,6 @@ package migration import ( - "github.com/andreyvit/diff" "testing" ) @@ -236,7 +235,7 @@ mystub-2.example.org { } if result != testCase.expectedCorefile { - t.Errorf("expected -> got diffs:\n%v", diff.LineDiff(testCase.expectedCorefile, result)) + t.Errorf("expected != result\n%v\n%v", testCase.expectedCorefile, result) } }) } @@ -338,7 +337,7 @@ func TestMigrateDown(t *testing.T) { } if result != testCase.expectedCorefile { - t.Errorf("expected -> got diffs:\n%v", diff.LineDiff(testCase.expectedCorefile, result)) + t.Errorf("expected != result:\n%v\n%v", testCase.expectedCorefile, result) } }) }