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command.go
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command.go
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// Copyright (c) 2018 The Jaeger Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package env
import (
"fmt"
"strings"
"github.com/spf13/cobra"
"github.com/spf13/pflag"
"github.com/jaegertracing/jaeger/plugin/metrics"
"github.com/jaegertracing/jaeger/plugin/sampling/strategystore"
"github.com/jaegertracing/jaeger/plugin/storage"
)
const (
longTemplate = `
All command line options can be provided via environment variables by converting
their names to upper case and replacing punctuation with underscores. For example:
command line option environment variable
------------------------------------------------------------------
--cassandra.connections-per-host CASSANDRA_CONNECTIONS_PER_HOST
--metrics-backend METRICS_BACKEND
The following configuration options are only available via environment variables:
%s
`
storageTypeDescription = `The type of backend [%s] used for trace storage.
Multiple backends can be specified as comma-separated list, e.g. "cassandra,elasticsearch"
(currently only for writing spans). Note that "kafka" is only valid in jaeger-collector;
it is not a replacement for a proper storage backend, and only used as a buffer for spans
when Jaeger is deployed in the collector+ingester configuration.
`
samplingTypeDescription = `The method [%s] used for determining the sampling rates served
to clients configured with remote sampling enabled. "file" uses a periodically reloaded file and
"adaptive" dynamically adjusts sampling rates based on current traffic.
`
samplingStorageTypeDescription = `The type of backend [%s] used for adaptive sampling storage
when adaptive sampling is enabled via %s.
`
metricsStorageTypeDescription = `The type of backend [%s] used as a metrics store with
Service Performance Monitoring (https://www.jaegertracing.io/docs/latest/spm/).
`
)
// Command creates `env` command
func Command() *cobra.Command {
fs := new(pflag.FlagSet)
fs.String(
storage.SpanStorageTypeEnvVar,
"cassandra",
fmt.Sprintf(
strings.ReplaceAll(storageTypeDescription, "\n", " "),
strings.Join(storage.AllStorageTypes, ", "),
),
)
fs.String(
storage.DependencyStorageTypeEnvVar,
"${SPAN_STORAGE_TYPE}",
"The type of backend used for service dependencies storage.",
)
fs.String(
strategystore.SamplingTypeEnvVar,
"file",
fmt.Sprintf(
strings.ReplaceAll(samplingTypeDescription, "\n", " "),
strings.Join(strategystore.AllSamplingTypes, ", "),
),
)
fs.String(
storage.SamplingStorageTypeEnvVar,
"",
fmt.Sprintf(
strings.ReplaceAll(samplingStorageTypeDescription, "\n", " "),
strings.Join(storage.AllSamplingStorageTypes(), ", "),
strategystore.SamplingTypeEnvVar,
),
)
fs.String(
metrics.StorageTypeEnvVar,
"",
fmt.Sprintf(
strings.ReplaceAll(metricsStorageTypeDescription, "\n", " "),
strings.Join(metrics.AllStorageTypes, ", "),
),
)
long := fmt.Sprintf(longTemplate, strings.ReplaceAll(fs.FlagUsagesWrapped(0), " --", "\n"))
return &cobra.Command{
Use: "env",
Short: "Help about environment variables.",
Long: long,
Run: func(cmd *cobra.Command, args []string) {
fmt.Fprint(cmd.OutOrStdout(), long)
},
}
}