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envoy.go
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envoy.go
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// Package envoy provides a high level view of the variables that go into
// selecting an envoy version.
package envoy
import (
"fmt"
)
const (
// SidecarMetaParam is the parameter name used to configure the connect sidecar
// at the client level. Setting this option in client configuration takes the
// lowest precedence.
//
// If this meta option is not set in client configuration, it defaults to
// ImageFormat, so that Nomad will defer envoy version selection to Consul.
SidecarMetaParam = "connect.sidecar_image"
// SidecarConfigVar is used as the default config.image value for connect
// sidecar proxies, when they are injected in the job connect mutator.
SidecarConfigVar = "${meta." + SidecarMetaParam + "}"
// GatewayMetaParam is the parameter name used to configure the connect gateway
// at the client level. Setting this option in client configuration takes the
// lowest precedence.
//
// If this meta option is not set in client configuration, it defaults to
// ImageFormat, so that Nomad will defer envoy version selection to Consul.
GatewayMetaParam = "connect.gateway_image"
// GatewayConfigVar is used as the default config.image value for connect
// gateway proxies, when they are injected in the job connect mutator.
GatewayConfigVar = "${meta." + GatewayMetaParam + "}"
// ImageFormat is the default format string used for official envoy Docker
// images with the tag being the semver of the version of envoy. Nomad fakes
// interpolation of ${NOMAD_envoy_version} by replacing it with the version
// string for envoy that Consul reports as preferred.
//
// Folks wanting to build and use custom images while still having Nomad refer
// to specific versions as preferred by Consul would set meta.connect.sidecar_image
// to something like: "custom/envoy:${NOMAD_envoy_version}".
ImageFormat = "envoyproxy/envoy:v" + VersionVar
// VersionVar will be replaced with the Envoy version string when
// used in the meta.connect.sidecar_image variable.
VersionVar = "${NOMAD_envoy_version}"
// FallbackImage is the image set in the node meta by default
// to be used by Consul Connect sidecar tasks. As of Nomad 1.0, this value
// is only used as a fallback when the version of Consul does not yet support
// dynamic envoy versions.
FallbackImage = "envoyproxy/envoy:v1.11.2@sha256:a7769160c9c1a55bb8d07a3b71ce5d64f72b1f665f10d81aa1581bc3cf850d09"
)
// PortLabel creates a consistent port label using the inputs of a prefix,
// service name, and optional suffix. The prefix should be the Kind part of
// TaskKind the envoy is being configured for.
func PortLabel(prefix, service, suffix string) string {
if suffix == "" {
return fmt.Sprintf("%s-%s", prefix, service)
}
return fmt.Sprintf("%s-%s-%s", prefix, service, suffix)
}