mirror of
https://github.com/openfaas/faasd.git
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50de0f34bb
**What** - Use the compose-go library to read the service definitions from an external compose file instead of building them in Go - Add default compose file and copy during `faasd install` - Add test for load and parse of compose file - Make testing easier by sorting the env keys - Allow append to instantiate the slices so that we can more easily test for proper parsing (e.g. nil is still nil etc) - Add the arch suffix to the compose file and set this as part of the env when we parse the compose file. This allows faasd to dynamically set the arch suffix used for the basic auth and the gateway images. Signed-off-by: Lucas Roesler <roesler.lucas@gmail.com>
105 lines
3.4 KiB
Go
Generated
105 lines
3.4 KiB
Go
Generated
/*
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Copyright 2020 The Compose Specification Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package envfile
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import (
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"bufio"
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"bytes"
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"fmt"
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"os"
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"strings"
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"unicode"
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"unicode/utf8"
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"github.com/compose-spec/compose-go/types"
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)
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const whiteSpaces = " \t"
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// ErrBadKey typed error for bad environment variable
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type ErrBadKey struct {
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msg string
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}
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func (e ErrBadKey) Error() string {
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return fmt.Sprintf("poorly formatted environment: %s", e.msg)
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}
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// Parse reads a file with environment variables enumerated by lines
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//
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// ``Environment variable names used by the utilities in the Shell and
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// Utilities volume of IEEE Std 1003.1-2001 consist solely of uppercase
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// letters, digits, and the '_' (underscore) from the characters defined in
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// Portable Character Set and do not begin with a digit. *But*, other
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// characters may be permitted by an implementation; applications shall
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// tolerate the presence of such names.''
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// -- http://pubs.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap08.html
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//
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// As of #16585, it's up to application inside docker to validate or not
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// environment variables, that's why we just strip leading whitespace and
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// nothing more.
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// Converts ["key=value"] to {"key":"value"} but set unset keys - the ones with no "=" in them - to nil
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// We use this in cases where we need to distinguish between FOO= and FOO
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// where the latter case just means FOO was mentioned but not given a value
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func Parse(filename string) (types.MappingWithEquals, error) {
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vars := types.MappingWithEquals{}
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fh, err := os.Open(filename)
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if err != nil {
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return vars, err
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}
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defer fh.Close()
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scanner := bufio.NewScanner(fh)
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currentLine := 0
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utf8bom := []byte{0xEF, 0xBB, 0xBF}
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for scanner.Scan() {
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scannedBytes := scanner.Bytes()
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if !utf8.Valid(scannedBytes) {
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return vars, fmt.Errorf("env file %s contains invalid utf8 bytes at line %d: %v", filename, currentLine+1, scannedBytes)
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}
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// We trim UTF8 BOM
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if currentLine == 0 {
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scannedBytes = bytes.TrimPrefix(scannedBytes, utf8bom)
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}
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// trim the line from all leading whitespace first
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line := strings.TrimLeftFunc(string(scannedBytes), unicode.IsSpace)
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currentLine++
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// line is not empty, and not starting with '#'
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if len(line) > 0 && !strings.HasPrefix(line, "#") {
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data := strings.SplitN(line, "=", 2)
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// trim the front of a variable, but nothing else
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variable := strings.TrimLeft(data[0], whiteSpaces)
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if strings.ContainsAny(variable, whiteSpaces) {
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return vars, ErrBadKey{fmt.Sprintf("variable '%s' contains whitespaces", variable)}
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}
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if len(variable) == 0 {
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return vars, ErrBadKey{fmt.Sprintf("no variable name on line '%s'", line)}
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}
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if len(data) > 1 {
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// pass the value through, no trimming
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vars[variable] = &data[1]
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} else {
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// variable was not given a value but declared
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vars[strings.TrimSpace(line)] = nil
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}
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}
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}
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return vars, scanner.Err()
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}
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