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refactor: move template renderer to its own file (#105)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,102 @@ | ||
| package file | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "fmt" | ||
| "os" | ||
| "strconv" | ||
| "strings" | ||
| "text/template" | ||
| ) | ||
|
|
||
| func getPrefixedEnvVar(key string) (string, error) { | ||
| const envVarPrefix = "DECK_" | ||
| if !strings.HasPrefix(key, envVarPrefix) { | ||
| return "", fmt.Errorf("environment variables in the state file must "+ | ||
| "be prefixed with 'DECK_', found: '%s'", key) | ||
| } | ||
| value, exists := os.LookupEnv(key) | ||
| if !exists { | ||
| return "", fmt.Errorf("environment variable '%s' present in state file but not set", key) | ||
| } | ||
| return value, nil | ||
| } | ||
|
|
||
| // getPrefixedEnvVarMocked is used when we mock the env variables while rendering a template. | ||
| // It will always return the name of the environment variable in this case. | ||
| func getPrefixedEnvVarMocked(key string) (string, error) { | ||
| const envVarPrefix = "DECK_" | ||
| if !strings.HasPrefix(key, envVarPrefix) { | ||
| return "", fmt.Errorf("environment variables in the state file must "+ | ||
| "be prefixed with 'DECK_', found: '%s'", key) | ||
| } | ||
| return key, nil | ||
| } | ||
|
|
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| func toBool(key string) (bool, error) { | ||
| return strconv.ParseBool(key) | ||
| } | ||
|
|
||
| // toBoolMocked is used when we mock the env variables while rendering a template. | ||
| // It will always return false in this case. | ||
| func toBoolMocked(_ string) (bool, error) { | ||
| return false, nil | ||
| } | ||
|
|
||
| func toInt(key string) (int, error) { | ||
| return strconv.Atoi(key) | ||
| } | ||
|
|
||
| // toIntMocked is used when we mock the env variables while rendering a template. | ||
| // It will always return 42 in this case. | ||
| func toIntMocked(_ string) (int, error) { | ||
| return 42, nil | ||
| } | ||
|
|
||
| func toFloat(key string) (float64, error) { | ||
| return strconv.ParseFloat(key, 64) | ||
| } | ||
|
|
||
| // toFloatMocked is used when we mock the env variables while rendering a template. | ||
| // It will always return 42 in this case. | ||
| func toFloatMocked(_ string) (float64, error) { | ||
| return 42, nil | ||
| } | ||
|
|
||
| func indent(spaces int, v string) string { | ||
| pad := strings.Repeat(" ", spaces) | ||
| return strings.Replace(v, "\n", "\n"+pad, -1) | ||
| } | ||
|
|
||
| func renderTemplate(content string, mockEnvVars bool) (string, error) { | ||
| var templateFuncs template.FuncMap | ||
| if mockEnvVars { | ||
| templateFuncs = template.FuncMap{ | ||
| "env": getPrefixedEnvVarMocked, | ||
| "toBool": toBoolMocked, | ||
| "toInt": toIntMocked, | ||
| "toFloat": toFloatMocked, | ||
| "indent": indent, | ||
| } | ||
| } else { | ||
| templateFuncs = template.FuncMap{ | ||
| "env": getPrefixedEnvVar, | ||
| "toBool": toBool, | ||
| "toInt": toInt, | ||
| "toFloat": toFloat, | ||
| "indent": indent, | ||
| } | ||
| } | ||
| t := template.New("state").Funcs(templateFuncs).Delims("${{", "}}") | ||
|
|
||
| t, err := t.Parse(content) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| var buffer bytes.Buffer | ||
| err = t.Execute(&buffer, nil) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| return buffer.String(), nil | ||
| } |