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Merge pull request #472 from basecamp/move-healthcheck-poller-to-cli
Healthcheck polling is a CLI concern
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,64 @@ | ||
module Kamal::Cli::Healthcheck::Poller | ||
extend self | ||
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TRAEFIK_UPDATE_DELAY = 5 | ||
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class HealthcheckError < StandardError; end | ||
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def wait_for_healthy(pause_after_ready: false, &block) | ||
attempt = 1 | ||
max_attempts = KAMAL.config.healthcheck["max_attempts"] | ||
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begin | ||
case status = block.call | ||
when "healthy" | ||
sleep TRAEFIK_UPDATE_DELAY if pause_after_ready | ||
when "running" # No health check configured | ||
sleep KAMAL.config.readiness_delay if pause_after_ready | ||
else | ||
raise HealthcheckError, "container not ready (#{status})" | ||
end | ||
rescue HealthcheckError => e | ||
if attempt <= max_attempts | ||
info "#{e.message}, retrying in #{attempt}s (attempt #{attempt}/#{max_attempts})..." | ||
sleep attempt | ||
attempt += 1 | ||
retry | ||
else | ||
raise | ||
end | ||
end | ||
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info "Container is healthy!" | ||
end | ||
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def wait_for_unhealthy(pause_after_ready: false, &block) | ||
attempt = 1 | ||
max_attempts = KAMAL.config.healthcheck["max_attempts"] | ||
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begin | ||
case status = block.call | ||
when "unhealthy" | ||
sleep TRAEFIK_UPDATE_DELAY if pause_after_ready | ||
else | ||
raise HealthcheckError, "container not unhealthy (#{status})" | ||
end | ||
rescue HealthcheckError => e | ||
if attempt <= max_attempts | ||
info "#{e.message}, retrying in #{attempt}s (attempt #{attempt}/#{max_attempts})..." | ||
sleep attempt | ||
attempt += 1 | ||
retry | ||
else | ||
raise | ||
end | ||
end | ||
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info "Container is unhealthy!" | ||
end | ||
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private | ||
def info(message) | ||
SSHKit.config.output.info(message) | ||
end | ||
end |
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