Gomplate erroring out

[nbtolambe]

Hello, I've been trying to generate below file using gomplate with combination of aws+sm datasource.
File content :
alertmanager.yaml

receivers:
- name: default
  slack_configs:
  - api_url: '{{ (ds "config" | json).slack_api_url }}'
    channel: test-alerts
    title: |-
            [{{ .Status | toUpper }}{{ if eq .Status "firing" }}:{{ .Alerts.Firing | len }}{{ end }}] {{ .CommonLabels.alertname }} for {{ .CommonLabels.job }} `}}
            {{- if gt (len .CommonLabels) (len .GroupLabels) -}}
             {{" "}}(
               {{- with .CommonLabels.Remove .GroupLabels.Names }}
                  {{- range $index, $label := .SortedPairs -}}
                    {{ if $index }}, {{ end }}
                    {{- $label.Name }}="{{ $label.Value -}}"
                  {{- end }}
               {{- end -}}
               )
            {{- end }}
    send_resolved: true
route:
  group_by:
  - alertname
  group_interval: 30s
  group_wait: 30s
  receiver: default
  repeat_interval: 3h

I am trying to run below command

gomplate --verbose -f alertmanager.yml  -d config=aws+sm:some_secret

However, it's erroring out with the below error :

17:37:14 ERR  error="failed to render template alertmanager.yml: template: alertmanager.yml:13:16: executing \"alertmanager.yml\" at <.Status>: map has no entry for key \"Status\""

I want the file to be rendered as it is with only slack_api_url fetched from AWS SM
I would appreciate any help.

[nbtolambe]

@hairyhenderson Can you please help here? I tried the same thing using --context, but failing without luck.

[tewfik-ghariani]

The alerting template syntax is meddling with the gomplate expected syntax

There are a couple of options in this case:

1. Escape those curly braces by making gomplate render literal strings via {{ "{{" }}

title: |-
  [{{ "{{" }} .Status | toUpper {{ "}}" }}{{ "{{" }} if eq .Status "firing" {{ "}}" }}

---

2. Alter the separator of gomplate itself and keep the rest as it is

gomplate .. --left-delim "<<" --right-delim ">>"

( or via GOMPLATE_LEFT_DELIM and GOMPLATE_RIGHT_DELIM environment variables )

Then update the datasource line accordingly

  - api_url: '<< (ds "config" | json).slack_api_url >>'

---

3. Move out the template to an external file and then "Read" it via gomplate

    [{{ .Status | toUpper }}{{ if eq .Status "firing" }}:{{ .Alerts.Firing | len }}{{ end }}] {{ .CommonLabels.alertname }} for {{ .CommonLabels.job }} `}}
    {{- if gt (len .CommonLabels) (len .GroupLabels) -}}
.... etc

  - api_url: '{{ (ds "config" | json).slack_api_url }}'
    channel: test-alerts
    title: |-
       {{ file.Read "template-file" | indent 6 | trimSpace }}

[nbtolambe]

2nd approach of adding a delimiter helped. Thanks a lot.