Golang Evaluate Examples

Example #1

File: atc_config.go Project: mmb/fly

func (atcConfig ATCConfig) newConfig(configPath PathFlag, templateVariablesFiles []PathFlag, templateVariables template.Variables) atc.Config {
	configFile, err := ioutil.ReadFile(string(configPath))
	if err != nil {
		failWithErrorf("could not read config file", err)
	}

	var resultVars template.Variables

	for _, path := range templateVariablesFiles {
		fileVars, templateErr := template.LoadVariablesFromFile(string(path))
		if templateErr != nil {
			failWithErrorf("failed to load variables from file (%s)", templateErr, string(path))
		}

		resultVars = resultVars.Merge(fileVars)
	}

	resultVars = resultVars.Merge(templateVariables)

	configFile, err = template.Evaluate(configFile, resultVars)
	if err != nil {
		failWithErrorf("failed to evaluate variables into template", err)
	}

	var newConfig atc.Config
	err = yaml.Unmarshal(configFile, &newConfig)
	if err != nil {
		failWithErrorf("failed to parse configuration file", err)
	}

	return newConfig
}

Example #2

File: configure.go Project: simonjjones/fly

func (atcConfig ATCConfig) newConfig(configPath string, templateVariablesFiles []string, templateVariables []string) (atc.Config, []byte) {
	configFile, err := ioutil.ReadFile(configPath)
	if err != nil {
		failWithErrorf("could not read config file", err)
	}

	var resultVars template.Variables

	for _, path := range templateVariablesFiles {
		fileVars, err := template.LoadVariablesFromFile(path)
		if err != nil {
			failWithErrorf("failed to load variables from file (%s)", err, path)
		}

		resultVars = resultVars.Merge(fileVars)
	}

	vars, err := template.LoadVariables(templateVariables)
	if err != nil {
		failWithErrorf("could not load template variables", err)
	}

	resultVars = resultVars.Merge(vars)

	configFile, err = template.Evaluate(configFile, resultVars)
	if err != nil {
		failWithErrorf("failed to evaluate variables into template", err)
	}

	var newConfig atc.Config
	err = yaml.Unmarshal(configFile, &newConfig)
	if err != nil {
		failWithErrorf("failed to parse configuration file", err)
	}

	fmt.Println("New Config Raw: %+v", newConfig)

	return newConfig, configFile
}

Example #3

File: template_test.go Project: aemengo/fly

import (
	. "github.com/onsi/ginkgo"
	. "github.com/onsi/gomega"

	"github.com/concourse/fly/template"
)

var _ = Describe("Template", func() {
	It("can template values into a byte slice", func() {
		byteSlice := []byte("{{key}}")
		variables := template.Variables{
			"key": "foo",
		}

		result, err := template.Evaluate(byteSlice, variables)
		Expect(err).NotTo(HaveOccurred())
		Expect(result).To(Equal([]byte(`"foo"`)))
	})

	It("can template multiple values into a byte slice", func() {
		byteSlice := []byte("{{key}}={{value}}")
		variables := template.Variables{
			"key":   "foo",
			"value": "bar",
		}

		result, err := template.Evaluate(byteSlice, variables)
		Expect(err).NotTo(HaveOccurred())
		Expect(result).To(Equal([]byte(`"foo"="bar"`)))
	})