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feat: add container env prefix COM_ALIYUN_META_ENVS_ as custom metas. #275

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feat: add container env prefix COM_ALIYUN_META_ENVS_ as custom metas. #275

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22 changes: 21 additions & 1 deletion pilot/extension.go
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Original file line number Diff line number Diff line change
@@ -1,8 +1,9 @@
package pilot

import (
"github.com/docker/docker/api/types"
"strings"

"github.com/docker/docker/api/types"
)

func extension(container map[string]string, containerJSON *types.ContainerJSON) {
Expand All @@ -14,4 +15,23 @@ func extension(container map[string]string, containerJSON *types.ContainerJSON)
putIfNotEmpty(container, name, value)
}
}
env := containerJSON.Config.Env
containerEnvMap := make(map[string]string) // all container envs map
containerMetaEnvMap := make(map[string]string) // container meta env which will be injected into log-pilot
for _, e := range env {
envKV := strings.SplitN(e, "=", 2)
containerEnvMap[envKV[0]] = envKV[1]
if strings.HasPrefix(e, "COM_ALIYUN_META_ENVS_") {
// e.g. COM_ALIYUN_META_ENVS_MY_POD_IP = k8s_pod_ip
// MY_POD_IP is the original env key,
// k8s_pod_ip is the target field name which put into the tplt.
metaEnvName := strings.TrimPrefix(envKV[0], "COM_ALIYUN_META_ENVS_")
containerMetaEnvMap[metaEnvName] = envKV[1]
}
}
for metaEnvKey, metaEnvValueAsFieldName := range containerMetaEnvMap {
if envValue, exists := containerEnvMap[metaEnvKey]; exists {
putIfNotEmpty(container, metaEnvValueAsFieldName, envValue)
}
}
}