100 lines
3.7 KiB
Go
100 lines
3.7 KiB
Go
package app
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import (
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"bytes"
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"fmt"
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"github.com/imdario/mergo"
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"github.com/roboll/helmfile/environment"
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"github.com/roboll/helmfile/state"
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"github.com/roboll/helmfile/tmpl"
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"strings"
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)
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func prependLineNumbers(text string) string {
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buf := bytes.NewBufferString("")
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lines := strings.Split(text, "\n")
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for i, line := range lines {
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buf.WriteString(fmt.Sprintf("%2d: %s\n", i, line))
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}
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return buf.String()
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}
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func (r *desiredStateLoader) renderEnvironment(firstPassEnv environment.Environment, baseDir, filename string, content []byte) environment.Environment {
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tmplData := state.EnvironmentTemplateData{Environment: firstPassEnv, Namespace: r.namespace}
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firstPassRenderer := tmpl.NewFirstPassRenderer(baseDir, tmplData)
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// parse as much as we can, tolerate errors, this is a preparse
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yamlBuf, err := firstPassRenderer.RenderTemplateContentToBuffer(content)
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if err != nil && r.logger != nil {
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r.logger.Debugf("first-pass rendering input of \"%s\":\n%s", filename, prependLineNumbers(string(content)))
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if yamlBuf == nil { // we have a template syntax error, let the second parse report
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r.logger.Debugf("template syntax error: %v", err)
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return firstPassEnv
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}
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}
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c := state.NewCreator(r.logger, r.readFile, r.abs)
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c.Strict = false
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// create preliminary state, as we may have an environment. Tolerate errors.
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prestate, err := c.ParseAndLoadEnv(yamlBuf.Bytes(), baseDir, filename, r.env)
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if err != nil && r.logger != nil {
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switch err.(type) {
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case *state.StateLoadError:
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r.logger.Infof("could not deduce `environment:` block, configuring only .Environment.Name. error: %v", err)
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}
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r.logger.Debugf("error in first-pass rendering: result of \"%s\":\n%s", filename, prependLineNumbers(yamlBuf.String()))
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}
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if prestate != nil {
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intEnv := environment.Environment{Name: firstPassEnv.Name}
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if err := mergo.Merge(&intEnv, &firstPassEnv, mergo.WithAppendSlice); err != nil {
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r.logger.Debugf("error in first-pass rendering: result of \"%s\": %v", filename, err)
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return firstPassEnv
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}
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if err := mergo.Merge(&intEnv, &prestate.Env, mergo.WithAppendSlice); err != nil {
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r.logger.Debugf("error in first-pass rendering: result of \"%s\": %v", filename, err)
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return firstPassEnv
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}
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firstPassEnv = intEnv
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}
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return firstPassEnv
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}
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func (r *desiredStateLoader) renderTemplatesToYaml(baseDir, filename string, content []byte, context ...environment.Environment) (*bytes.Buffer, error) {
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var env environment.Environment
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if len(context) > 0 {
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env = context[0]
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} else {
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env = environment.Environment{Name: r.env, Values: map[string]interface{}(nil)}
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}
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return r.twoPassRenderTemplateToYaml(env, baseDir, filename, content)
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}
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func (r *desiredStateLoader) twoPassRenderTemplateToYaml(initEnv environment.Environment, baseDir, filename string, content []byte) (*bytes.Buffer, error) {
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// try a first pass render. This will always succeed, but can produce a limited env
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if r.logger != nil {
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r.logger.Debugf("first-pass rendering input of \"%s\": %v", filename, initEnv)
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}
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firstPassEnv := r.renderEnvironment(initEnv, baseDir, filename, content)
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if r.logger != nil {
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r.logger.Debugf("first-pass rendering result of \"%s\": %v", filename, firstPassEnv)
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}
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tmplData := state.EnvironmentTemplateData{Environment: firstPassEnv, Namespace: r.namespace}
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secondPassRenderer := tmpl.NewFileRenderer(r.readFile, baseDir, tmplData)
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yamlBuf, err := secondPassRenderer.RenderTemplateContentToBuffer(content)
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if err != nil {
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if r.logger != nil {
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r.logger.Debugf("second-pass rendering failed, input of \"%s\":\n%s", filename, prependLineNumbers(string(content)))
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}
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return nil, err
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}
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if r.logger != nil {
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r.logger.Debugf("second-pass rendering result of \"%s\":\n%s", filename, prependLineNumbers(yamlBuf.String()))
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}
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return yamlBuf, nil
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}
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