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staticconvert.go
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staticconvert.go
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package staticconvert
import (
"bytes"
"fmt"
"github.com/grafana/agent/converter/diag"
"github.com/grafana/agent/converter/internal/common"
"github.com/grafana/agent/converter/internal/prometheusconvert"
"github.com/grafana/agent/pkg/config"
"github.com/grafana/agent/pkg/metrics"
"github.com/grafana/agent/pkg/river/token/builder"
prom_config "github.com/prometheus/prometheus/config"
)
// Convert implements a Static config converter.
func Convert(in []byte) ([]byte, diag.Diagnostics) {
var diags diag.Diagnostics
var staticConfig config.Config
err := config.LoadBytes(in, false, &staticConfig)
if err != nil {
diags.Add(diag.SeverityLevelCritical, fmt.Sprintf("failed to parse Static config: %s", err))
return nil, diags
}
if err = staticConfig.Validate(nil); err != nil {
diags.Add(diag.SeverityLevelCritical, fmt.Sprintf("failed to validate Static config: %s", err))
return nil, diags
}
f := builder.NewFile()
diags = AppendAll(f, &staticConfig)
var buf bytes.Buffer
if _, err := f.WriteTo(&buf); err != nil {
diags.Add(diag.SeverityLevelCritical, fmt.Sprintf("failed to render Flow config: %s", err.Error()))
return nil, diags
}
if len(buf.Bytes()) == 0 {
return nil, diags
}
prettyByte, newDiags := common.PrettyPrint(buf.Bytes())
diags = append(diags, newDiags...)
return prettyByte, diags
}
// AppendAll analyzes the entire static config in memory and transforms it
// into Flow Arguments. It then appends each argument to the file builder.
// Exports from other components are correctly referenced to build the Flow
// pipeline.
func AppendAll(f *builder.File, staticConfig *config.Config) diag.Diagnostics {
var diags diag.Diagnostics
newDiags := AppendStaticPrometheus(f, staticConfig)
diags = append(diags, newDiags...)
// TODO promtail
// TODO otel
// TODO other
return diags
}
func AppendStaticPrometheus(f *builder.File, staticConfig *config.Config) diag.Diagnostics {
var diags diag.Diagnostics
for _, instance := range staticConfig.Metrics.Configs {
promConfig := &prom_config.Config{
GlobalConfig: staticConfig.Metrics.Global.Prometheus,
ScrapeConfigs: instance.ScrapeConfigs,
RemoteWriteConfigs: instance.RemoteWrite,
}
// There is an edge case unhandled here with label collisions.
// For example,
// metrics config name = "agent_test"
// scrape config job_name = "prometheus"
//
// metrics config name = "agent"
// scrape config job_name = "test_prometheus"
//
// results in two prometheus.scrape components with the label "agent_test_prometheus"
newDiags := prometheusconvert.AppendAll(f, promConfig, instance.Name)
diags = append(diags, newDiags...)
}
newDiags := validateMetrics(staticConfig)
diags = append(diags, newDiags...)
return diags
}
func validateMetrics(staticConfig *config.Config) diag.Diagnostics {
var diags diag.Diagnostics
if staticConfig.Metrics.WALDir != metrics.DefaultConfig.WALDir {
diags.Add(diag.SeverityLevelError, "unsupported config for wal_directory was provided. use the run command flag --storage.path for Flow mode instead.")
}
// TODO Static to Flow unsupported features
return diags
}