add logfmt code

* our own "tail -f" implementation in tail.go
* filtering and formatting on per-line basis in handleline.go
* recognition of vespa-internal components in internal.go
* cobra-compatible flags for "level" in levelflags.go
* cobra-compatible flags for "show" in showflags.go
* cobra-compatible flag for regex handling in regexflag.go
* options designed for compatibility with perl version in options.go
* entrypoint in runlogfmt.go

15 files changed, 1756 insertions, 0 deletions

diff --git a/client/go/cmd/logfmt/handleline.go b/client/go/cmd/logfmt/handleline.go
new file mode 100644
index 00000000000..33a1a1b386b
--- /dev/null
+++ b/client/go/cmd/logfmt/handleline.go
@@ -0,0 +1,116 @@
+// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+// vespa logfmt command
+// Author: arnej
+
+package logfmt
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+	"time"
+)
+
+// handle a line in "vespa.log" format; do filtering and formatting as specified in opts
+
+func handleLine(opts *Options, line string) (output string, err error) {
+	fields := strings.SplitN(line, "\t", 7)
+	if len(fields) < 7 {
+		return "", fmt.Errorf("not enough fields: '%s'", line)
+	}
+	timestampfield := fields[0] // seconds, optional fractional seconds
+	hostfield := fields[1]
+	pidfield := fields[2] // pid, optional tid
+	servicefield := fields[3]
+	componentfield := fields[4]
+	levelfield := fields[5]
+	messagefields := fields[6:]
+
+	if !opts.showLevel(levelfield) {
+		return "", nil
+	}
+	if opts.OnlyHostname != "" && opts.OnlyHostname != hostfield {
+		return "", nil
+	}
+	if opts.OnlyPid != "" && opts.OnlyPid != pidfield {
+		return "", nil
+	}
+	if opts.OnlyService != "" && opts.OnlyService != servicefield {
+		return "", nil
+	}
+	if opts.OnlyInternal && !isInternal(componentfield) {
+		return "", nil
+	}
+	if opts.ComponentFilter.unmatched(componentfield) {
+		return "", nil
+	}
+	if opts.MessageFilter.unmatched(strings.Join(messagefields, "\t")) {
+		return "", nil
+	}
+
+	var buf strings.Builder
+
+	if opts.showField("fmttime") {
+		secs, err := strconv.ParseFloat(timestampfield, 64)
+		if err != nil {
+			return "", err
+		}
+		nsecs := int64(secs * 1e9)
+		timestamp := time.Unix(0, nsecs)
+		if opts.showField("usecs") {
+			buf.WriteString(timestamp.Format("[2006-01-02 15:04:05.000000] "))
+		} else if opts.showField("msecs") {
+			buf.WriteString(timestamp.Format("[2006-01-02 15:04:05.000] "))
+		} else {
+			buf.WriteString(timestamp.Format("[2006-01-02 15:04:05] "))
+		}
+	} else if opts.showField("time") {
+		buf.WriteString(timestampfield)
+		buf.WriteString(" ")
+	}
+	if opts.showField("host") {
+		buf.WriteString(fmt.Sprintf("%-8s ", hostfield))
+	}
+	if opts.showField("level") {
+		buf.WriteString(fmt.Sprintf("%-7s ", strings.ToUpper(levelfield)))
+	}
+	if opts.showField("pid") {
+		// OnlyPid, _, _ := strings.Cut(pidfield, "/")
+		buf.WriteString(fmt.Sprintf("%6s ", pidfield))
+	}
+	if opts.showField("service") {
+		if opts.TruncateService {
+			buf.WriteString(fmt.Sprintf("%-9.9s ", servicefield))
+		} else {
+			buf.WriteString(fmt.Sprintf("%-16s ", servicefield))
+		}
+	}
+	if opts.showField("component") {
+		if opts.TruncateComponent {
+			buf.WriteString(fmt.Sprintf("%-15.15s ", componentfield))
+		} else {
+			buf.WriteString(fmt.Sprintf("%s\t", componentfield))
+		}
+	}
+	if opts.showField("message") {
+		var msgBuf strings.Builder
+		for idx, message := range messagefields {
+			if idx > 0 {
+				msgBuf.WriteString("\n\t")
+			}
+			if opts.DequoteNewlines {
+				message = strings.ReplaceAll(message, "\\n\\t", "\n\t")
+				message = strings.ReplaceAll(message, "\\n", "\n\t")
+			}
+			msgBuf.WriteString(message)
+		}
+		message := msgBuf.String()
+		if strings.Contains(message, "\n") {
+			buf.WriteString("\n\t")
+		}
+		buf.WriteString(message)
+	}
+	buf.WriteString("\n")
+	output = buf.String()
+	return
+}
diff --git a/client/go/cmd/logfmt/internal.go b/client/go/cmd/logfmt/internal.go
new file mode 100644
index 00000000000..992c537f939
--- /dev/null
+++ b/client/go/cmd/logfmt/internal.go
@@ -0,0 +1,106 @@
+// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+// vespa logfmt command
+// Author: arnej
+
+package logfmt
+
+import (
+	"strings"
+)
+
+// is componentName a vespa-internal name?
+
+func isInternal(componentName string) bool {
+	cs := strings.Split(componentName, ".")
+	if len(cs) == 0 || cs[0] != "Container" {
+		return true
+	}
+	if len(cs) < 3 {
+		return false
+	}
+	if cs[1] == "ai" && cs[2] == "vespa" {
+		return true
+	}
+	if cs[1] == "com" && cs[2] == "yahoo" && len(cs) > 3 {
+		return internalComYahooNames[cs[3]]
+	}
+	return false
+}
+
+// a constant:
+var internalComYahooNames = map[string]bool{
+	"abicheck":              true,
+	"api":                   true,
+	"application":           true,
+	"binaryprefix":          true,
+	"clientmetrics":         true,
+	"cloud":                 true,
+	"collections":           true,
+	"component":             true,
+	"compress":              true,
+	"concurrent":            true,
+	"configtest":            true,
+	"config":                true,
+	"container":             true,
+	"data":                  true,
+	"docprocs":              true,
+	"docproc":               true,
+	"documentapi":           true,
+	"documentmodel":         true,
+	"document":              true,
+	"dummyreceiver":         true,
+	"embedding":             true,
+	"errorhandling":         true,
+	"exception":             true,
+	"feedapi":               true,
+	"feedhandler":           true,
+	"filedistribution":      true,
+	"fs4":                   true,
+	"fsa":                   true,
+	"geo":                   true,
+	"io":                    true,
+	"javacc":                true,
+	"jdisc":                 true,
+	"jrt":                   true,
+	"lang":                  true,
+	"language":              true,
+	"logserver":             true,
+	"log":                   true,
+	"messagebus":            true,
+	"metrics":               true,
+	"nativec":               true,
+	"net":                   true,
+	"osgi":                  true,
+	"path":                  true,
+	"plugin":                true,
+	"prelude":               true,
+	"processing":            true,
+	"protect":               true,
+	"reflection":            true,
+	"restapi":               true,
+	"schema":                true,
+	"searchdefinition":      true,
+	"searchlib":             true,
+	"search":                true,
+	"security":              true,
+	"slime":                 true,
+	"socket":                true,
+	"statistics":            true,
+	"stream":                true,
+	"system":                true,
+	"tensor":                true,
+	"test":                  true,
+	"text":                  true,
+	"time":                  true,
+	"transaction":           true,
+	"vdslib":                true,
+	"vespaclient":           true,
+	"vespafeeder":           true,
+	"vespaget":              true,
+	"vespastat":             true,
+	"vespasummarybenchmark": true,
+	"vespa":                 true,
+	"vespavisit":            true,
+	"vespaxmlparser":        true,
+	"yolean":                true,
+}
diff --git a/client/go/cmd/logfmt/internal_names.txt b/client/go/cmd/logfmt/internal_names.txt
new file mode 100644
index 00000000000..cc554546fcc
--- /dev/null
+++ b/client/go/cmd/logfmt/internal_names.txt
@@ -0,0 +1,782 @@
+sentinel.sentinel.config
+searchnode.eval.Test
+Container.ai.vespa.client.dsl.Test
+Container.ai.vespa.cloud.Test
+Container.ai.vespa.embedding.Test
+Container.ai.vespa.explicitversion.Test
+Container.ai.vespa.explicitversion_dep.Test
+Container.ai.vespa.feed.client.Test
+Container.ai.vespa.feed.client.impl.Test
+Container.ai.vespa.hosted.api.Test
+Container.ai.vespa.hosted.cd.Test
+Container.ai.vespa.hosted.cd.cloud.impl.Test
+Container.ai.vespa.hosted.cd.commons.Test
+Container.ai.vespa.hosted.cd.internal.Test
+Container.ai.vespa.hosted.client.Test
+Container.ai.vespa.hosted.plugin.Test
+Container.ai.vespa.http.Test
+Container.ai.vespa.intellij.schema.Test
+Container.ai.vespa.intellij.schema.findUsages.Test
+Container.ai.vespa.intellij.schema.hierarchy.Test
+Container.ai.vespa.intellij.schema.lexer.Test
+Container.ai.vespa.intellij.schema.model.Test
+Container.ai.vespa.intellij.schema.parser.Test
+Container.ai.vespa.intellij.schema.psi.Test
+Container.ai.vespa.intellij.schema.psi.impl.Test
+Container.ai.vespa.intellij.schema.structure.Test
+Container.ai.vespa.intellij.schema.utils.Test
+Container.ai.vespa.logserver.protocol.Test
+Container.ai.vespa.metricsproxy.core.Test
+Container.ai.vespa.metricsproxy.http.Test
+Container.ai.vespa.metricsproxy.http.application.Test
+Container.ai.vespa.metricsproxy.http.metrics.Test
+Container.ai.vespa.metricsproxy.http.prometheus.Test
+Container.ai.vespa.metricsproxy.http.yamas.Test
+Container.ai.vespa.metricsproxy.metric.Test
+Container.ai.vespa.metricsproxy.metric.dimensions.Test
+Container.ai.vespa.metricsproxy.metric.model.Test
+Container.ai.vespa.metricsproxy.metric.model.json.Test
+Container.ai.vespa.metricsproxy.metric.model.processing.Test
+Container.ai.vespa.metricsproxy.metric.model.prometheus.Test
+Container.ai.vespa.metricsproxy.node.Test
+Container.ai.vespa.metricsproxy.rpc.Test
+Container.ai.vespa.metricsproxy.service.Test
+Container.ai.vespa.metricsproxy.telegraf.Test
+Container.ai.vespa.modelintegration.evaluator.Test
+Container.ai.vespa.models.evaluation.Test
+Container.ai.vespa.models.handler.Test
+Container.ai.vespa.noversion.Test
+Container.ai.vespa.noversion_dep.Test
+Container.ai.vespa.rankingexpression.importer.Test
+Container.ai.vespa.rankingexpression.importer.configmodelview.Test
+Container.ai.vespa.rankingexpression.importer.lightgbm.Test
+Container.ai.vespa.rankingexpression.importer.onnx.Test
+Container.ai.vespa.rankingexpression.importer.operations.Test
+Container.ai.vespa.rankingexpression.importer.tensorflow.Test
+Container.ai.vespa.rankingexpression.importer.vespa.Test
+Container.ai.vespa.rankingexpression.importer.vespa.parser.Test
+Container.ai.vespa.rankingexpression.importer.xgboost.Test
+Container.ai.vespa.reindexing.Test
+Container.ai.vespa.reindexing.http.Test
+Container.ai.vespa.searchlib.searchprotocol.protobuf.Test
+Container.ai.vespa.util.http.hc4.Test
+Container.ai.vespa.util.http.hc4.retry.Test
+Container.ai.vespa.util.http.hc5.Test
+Container.ai.vespa.validation.Test
+Container.com.yahoo.abicheck.classtree.Test
+Container.com.yahoo.abicheck.collector.Test
+Container.com.yahoo.abicheck.mojo.Test
+Container.com.yahoo.abicheck.setmatcher.Test
+Container.com.yahoo.abicheck.signature.Test
+Container.com.yahoo.api.annotations.Test
+Container.com.yahoo.application.Test
+Container.com.yahoo.application.container.Test
+Container.com.yahoo.application.container.handler.Test
+Container.com.yahoo.application.container.impl.Test
+Container.com.yahoo.application.content.Test
+Container.com.yahoo.application.preprocessor.Test
+Container.com.yahoo.binaryprefix.Test
+Container.com.yahoo.clientmetrics.Test
+Container.com.yahoo.cloud.config.Test
+Container.com.yahoo.collections.Test
+Container.com.yahoo.component.Test
+Container.com.yahoo.component.annotation.Test
+Container.com.yahoo.component.chain.Test
+Container.com.yahoo.component.chain.dependencies.Test
+Container.com.yahoo.component.chain.dependencies.ordering.Test
+Container.com.yahoo.component.chain.model.Test
+Container.com.yahoo.component.provider.Test
+Container.com.yahoo.compress.Test
+Container.com.yahoo.concurrent.Test
+Container.com.yahoo.concurrent.classlock.Test
+Container.com.yahoo.concurrent.maintenance.Test
+Container.com.yahoo.config.Test
+Container.com.yahoo.config.application.Test
+Container.com.yahoo.config.application.api.Test
+Container.com.yahoo.config.application.api.xml.Test
+Container.com.yahoo.config.codegen.Test
+Container.com.yahoo.config.docproc.Test
+Container.com.yahoo.config.ini.Test
+Container.com.yahoo.config.model.Test
+Container.com.yahoo.config.model.admin.Test
+Container.com.yahoo.config.model.api.Test
+Container.com.yahoo.config.model.api.container.Test
+Container.com.yahoo.config.model.application.Test
+Container.com.yahoo.config.model.application.provider.Test
+Container.com.yahoo.config.model.builder.xml.Test
+Container.com.yahoo.config.model.deploy.Test
+Container.com.yahoo.config.model.graph.Test
+Container.com.yahoo.config.model.producer.Test
+Container.com.yahoo.config.model.provision.Test
+Container.com.yahoo.config.model.test.Test
+Container.com.yahoo.config.provision.Test
+Container.com.yahoo.config.provision.exception.Test
+Container.com.yahoo.config.provision.host.Test
+Container.com.yahoo.config.provisioning.Test
+Container.com.yahoo.config.provision.security.Test
+Container.com.yahoo.config.provision.serialization.Test
+Container.com.yahoo.config.provision.zone.Test
+Container.com.yahoo.config.subscription.Test
+Container.com.yahoo.config.subscription.impl.Test
+Container.com.yahoo.configtest.Test
+Container.com.yahoo.config.text.Test
+Container.com.yahoo.container.Test
+Container.com.yahoo.container.bundle.Test
+Container.com.yahoo.container.core.Test
+Container.com.yahoo.container.core.config.Test
+Container.com.yahoo.container.core.config.testutil.Test
+Container.com.yahoo.container.core.document.Test
+Container.com.yahoo.container.core.documentapi.Test
+Container.com.yahoo.container.core.http.Test
+Container.com.yahoo.container.core.identity.Test
+Container.com.yahoo.container.di.Test
+Container.com.yahoo.container.di.componentgraph.Test
+Container.com.yahoo.container.di.componentgraph.core.Test
+Container.com.yahoo.container.di.componentgraph.cycle.Test
+Container.com.yahoo.container.di.config.Test
+Container.com.yahoo.container.handler.Test
+Container.com.yahoo.container.handler.metrics.Test
+Container.com.yahoo.container.handler.observability.Test
+Container.com.yahoo.container.handler.test.Test
+Container.com.yahoo.container.handler.threadpool.Test
+Container.com.yahoo.container.http.Test
+Container.com.yahoo.container.http.filter.Test
+Container.com.yahoo.container.jdisc.Test
+Container.com.yahoo.container.jdisc.athenz.Test
+Container.com.yahoo.container.jdisc.component.Test
+Container.com.yahoo.container.jdisc.config.Test
+Container.com.yahoo.container.jdisc.messagebus.Test
+Container.com.yahoo.container.jdisc.metric.Test
+Container.com.yahoo.container.jdisc.metric.state.Test
+Container.com.yahoo.container.jdisc.secretstore.Test
+Container.com.yahoo.container.jdisc.state.Test
+Container.com.yahoo.container.jdisc.utils.Test
+Container.com.yahoo.container.logging.Test
+Container.com.yahoo.container.plugin.bundle.Test
+Container.com.yahoo.container.plugin.classanalysis.Test
+Container.com.yahoo.container.plugin.mojo.Test
+Container.com.yahoo.container.plugin.osgi.Test
+Container.com.yahoo.container.plugin.util.Test
+Container.com.yahoo.container.protect.Test
+Container.com.yahoo.container.standalone.Test
+Container.com.yahoo.container.usability.Test
+Container.com.yahoo.data.Test
+Container.com.yahoo.data.access.Test
+Container.com.yahoo.data.access.simple.Test
+Container.com.yahoo.data.access.slime.Test
+Container.com.yahoo.docproc.Test
+Container.com.yahoo.docproc.impl.Test
+Container.com.yahoo.docproc.jdisc.Test
+Container.com.yahoo.docproc.jdisc.messagebus.Test
+Container.com.yahoo.docproc.jdisc.metric.Test
+Container.com.yahoo.docproc.jdisc.observability.Test
+Container.com.yahoo.docproc.proxy.Test
+Container.com.yahoo.docprocs.indexing.Test
+Container.com.yahoo.document.Test
+Container.com.yahoo.document.annotation.Test
+Container.com.yahoo.documentapi.Test
+Container.com.yahoo.documentapi.local.Test
+Container.com.yahoo.documentapi.messagebus.Test
+Container.com.yahoo.documentapi.messagebus.protocol.Test
+Container.com.yahoo.documentapi.messagebus.systemstate.rule.Test
+Container.com.yahoo.documentapi.metrics.Test
+Container.com.yahoo.document.config.Test
+Container.com.yahoo.document.datatypes.Test
+Container.com.yahoo.document.fieldpathupdate.Test
+Container.com.yahoo.document.fieldset.Test
+Container.com.yahoo.document.idstring.Test
+Container.com.yahoo.document.internal.Test
+Container.com.yahoo.document.json.Test
+Container.com.yahoo.document.json.document.Test
+Container.com.yahoo.document.json.readers.Test
+Container.com.yahoo.documentmodel.Test
+Container.com.yahoo.document.predicate.Test
+Container.com.yahoo.document.restapi.resource.Test
+Container.com.yahoo.document.select.Test
+Container.com.yahoo.document.select.convert.Test
+Container.com.yahoo.document.select.parser.Test
+Container.com.yahoo.document.select.rule.Test
+Container.com.yahoo.document.select.simple.Test
+Container.com.yahoo.document.serialization.Test
+Container.com.yahoo.document.update.Test
+Container.com.yahoo.dummyreceiver.Test
+Container.com.yahoo.embedding.Test
+Container.com.yahoo.errorhandling.Test
+Container.com.yahoo.exception.Test
+Container.com.yahoo.feedapi.Test
+Container.com.yahoo.feedhandler.Test
+Container.com.yahoo.filedistribution.fileacquirer.Test
+Container.com.yahoo.fs4.Test
+Container.com.yahoo.fsa.Test
+Container.com.yahoo.fsa.conceptnet.Test
+Container.com.yahoo.fsa.segmenter.Test
+Container.com.yahoo.fsa.topicpredictor.Test
+Container.com.yahoo.geo.Test
+Container.com.yahoo.io.Test
+Container.com.yahoo.io.reader.Test
+Container.com.yahoo.javacc.Test
+Container.com.yahoo.jdisc.Test
+Container.com.yahoo.jdisc.application.Test
+Container.com.yahoo.jdisc.bundle.Test
+Container.com.yahoo.jdisc.bundle.a.Test
+Container.com.yahoo.jdisc.bundle.b.Test
+Container.com.yahoo.jdisc.bundle.c.Test
+Container.com.yahoo.jdisc.bundle.d.Test
+Container.com.yahoo.jdisc.bundle.e.Test
+Container.com.yahoo.jdisc.bundle.f.Test
+Container.com.yahoo.jdisc.bundle.g.Test
+Container.com.yahoo.jdisc.bundle.g_act.Test
+Container.com.yahoo.jdisc.bundle.h.Test
+Container.com.yahoo.jdisc.bundle.i.Test
+Container.com.yahoo.jdisc.bundle.j.Test
+Container.com.yahoo.jdisc.bundle.k.Test
+Container.com.yahoo.jdisc.bundle.l.Test
+Container.com.yahoo.jdisc.bundle.m.Test
+Container.com.yahoo.jdisc.bundle.my_act.Test
+Container.com.yahoo.jdisc.bundle.n.Test
+Container.com.yahoo.jdisc.bundle.o.Test
+Container.com.yahoo.jdisc.bundle.p.Test
+Container.com.yahoo.jdisc.bundle.q.Test
+Container.com.yahoo.jdisc.bundle.r.Test
+Container.com.yahoo.jdisc.bundle.s.Test
+Container.com.yahoo.jdisc.bundle.t.Test
+Container.com.yahoo.jdisc.bundle.u.Test
+Container.com.yahoo.jdisc.client.Test
+Container.com.yahoo.jdisc.cloud.aws.Test
+Container.com.yahoo.jdisc.core.Test
+Container.com.yahoo.jdisc.handler.Test
+Container.com.yahoo.jdisc.http.Test
+Container.com.yahoo.jdisc.http.cloud.Test
+Container.com.yahoo.jdisc.http.filter.Test
+Container.com.yahoo.jdisc.http.filter.chain.Test
+Container.com.yahoo.jdisc.http.filter.security.athenz.Test
+Container.com.yahoo.jdisc.http.filter.security.base.Test
+Container.com.yahoo.jdisc.http.filter.security.cors.Test
+Container.com.yahoo.jdisc.http.filter.security.csp.Test
+Container.com.yahoo.jdisc.http.filter.security.misc.Test
+Container.com.yahoo.jdisc.http.filter.security.rule.Test
+Container.com.yahoo.jdisc.http.filter.util.Test
+Container.com.yahoo.jdisc.http.server.jetty.Test
+Container.com.yahoo.jdisc.http.server.jetty.testutils.Test
+Container.com.yahoo.jdisc.http.ssl.impl.Test
+Container.com.yahoo.jdisc.metrics.yamasconsumer.cloud.Test
+Container.com.yahoo.jdisc.refcount.Test
+Container.com.yahoo.jdisc.service.Test
+Container.com.yahoo.jdisc.statistics.Test
+Container.com.yahoo.jdisc.test.Test
+Container.com.yahoo.jrt.Test
+Container.com.yahoo.jrt.slobrok.Test
+Container.com.yahoo.jrt.slobrok.api.Test
+Container.com.yahoo.jrt.slobrok.server.Test
+Container.com.yahoo.jrt.tool.Test
+Container.com.yahoo.lang.Test
+Container.com.yahoo.language.Test
+Container.com.yahoo.language.detect.Test
+Container.com.yahoo.language.opennlp.Test
+Container.com.yahoo.language.process.Test
+Container.com.yahoo.language.provider.Test
+Container.com.yahoo.language.sentencepiece.Test
+Container.com.yahoo.language.simple.Test
+Container.com.yahoo.language.simple.kstem.Test
+Container.com.yahoo.language.tools.Test
+Container.com.yahoo.language.wordpiece.Test
+Container.com.yahoo.log.Test
+Container.com.yahoo.log.event.Test
+Container.com.yahoo.log.impl.Test
+Container.com.yahoo.logserver.Test
+Container.com.yahoo.logserver.filter.Test
+Container.com.yahoo.logserver.handlers.Test
+Container.com.yahoo.logserver.handlers.archive.Test
+Container.com.yahoo.logserver.handlers.logmetrics.Test
+Container.com.yahoo.logserver.testutils.Test
+Container.com.yahoo.messagebus.Test
+Container.com.yahoo.messagebus.jdisc.Test
+Container.com.yahoo.messagebus.jdisc.test.Test
+Container.com.yahoo.messagebus.network.Test
+Container.com.yahoo.messagebus.network.local.Test
+Container.com.yahoo.messagebus.network.rpc.Test
+Container.com.yahoo.messagebus.network.rpc.test.Test
+Container.com.yahoo.messagebus.routing.Test
+Container.com.yahoo.messagebus.routing.test.Test
+Container.com.yahoo.messagebus.shared.Test
+Container.com.yahoo.messagebus.test.Test
+Container.com.yahoo.metrics.Test
+Container.com.yahoo.metrics.simple.Test
+Container.com.yahoo.metrics.simple.jdisc.Test
+Container.com.yahoo.metrics.simple.runtime.Test
+Container.com.yahoo.nativec.Test
+Container.com.yahoo.net.Test
+Container.com.yahoo.osgi.Test
+Container.com.yahoo.osgi.annotation.Test
+Container.com.yahoo.osgi.provider.model.Test
+Container.com.yahoo.path.Test
+Container.com.yahoo.plugin.Test
+Container.com.yahoo.prelude.Test
+Container.com.yahoo.prelude.cluster.Test
+Container.com.yahoo.prelude.fastsearch.Test
+Container.com.yahoo.prelude.hitfield.Test
+Container.com.yahoo.prelude.query.Test
+Container.com.yahoo.prelude.query.parser.Test
+Container.com.yahoo.prelude.query.textualrepresentation.Test
+Container.com.yahoo.prelude.querytransform.Test
+Container.com.yahoo.prelude.searcher.Test
+Container.com.yahoo.prelude.semantics.Test
+Container.com.yahoo.prelude.semantics.benchmark.Test
+Container.com.yahoo.prelude.semantics.config.Test
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+Container.com.yahoo.processing.Test
+Container.com.yahoo.processing.execution.Test
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+Container.com.yahoo.processing.handler.Test
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+Container.com.yahoo.processing.rendering.Test
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+Container.com.yahoo.processing.request.properties.Test
+Container.com.yahoo.processing.response.Test
+Container.com.yahoo.processing.test.Test
+Container.com.yahoo.protect.Test
+Container.com.yahoo.reflection.Test
+Container.com.yahoo.restapi.Test
+Container.com.yahoo.schema.Test
+Container.com.yahoo.schema.derived.Test
+Container.com.yahoo.schema.derived.validation.Test
+Container.com.yahoo.schema.document.Test
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+Container.com.yahoo.schema.fieldoperation.Test
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+Container.com.yahoo.search.cluster.Test
+Container.com.yahoo.search.config.Test
+Container.com.yahoo.search.dispatch.Test
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+Container.com.yahoo.search.dispatch.searchcluster.Test
+Container.com.yahoo.search.federation.Test
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+Container.com.yahoo.search.federation.sourceref.Test
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+Container.com.yahoo.searchlib.rankingexpression.evaluation.Test
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+Container.com.yahoo.searchlib.rankingexpression.parser.Test
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+Container.com.yahoo.searchlib.ranking.features.Test
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+Container.com.yahoo.search.query.profile.compiled.Test
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+Container.com.yahoo.test.json.Test
+Container.com.yahoo.text.Test
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+Container.com.yahoo.vespa.athenz.api.Test
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+Container.com.yahoo.vespa.hosted.controller.restapi.billing.Test
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+Container.com.yahoo.vespa.hosted.controller.tls.Test
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+Container.com.yahoo.vespa.hosted.node.admin.configserver.state.bindings.Test
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+Container.com.yahoo.vespa.hosted.node.admin.maintenance.acl.Test
+Container.com.yahoo.vespa.hosted.node.admin.maintenance.coredump.Test
+Container.com.yahoo.vespa.hosted.node.admin.maintenance.disk.Test
+Container.com.yahoo.vespa.hosted.node.admin.maintenance.identity.Test
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+Container.com.yahoo.vespa.hosted.node.admin.maintenance.sync.Test
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+Container.com.yahoo.vespa.hosted.node.admin.nodeagent.Test
+Container.com.yahoo.vespa.hosted.node.admin.provider.Test
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+Container.com.yahoo.vespa.hosted.node.admin.task.util.editor.Test
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+Container.com.yahoo.vespa.hosted.node.admin.task.util.systemd.Test
+Container.com.yahoo.vespa.hosted.node.admin.task.util.template.Test
+Container.com.yahoo.vespa.hosted.node.admin.task.util.text.Test
+Container.com.yahoo.vespa.hosted.node.admin.task.util.yum.Test
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+Container.com.yahoo.vespa.hosted.provision.autoscale.Test
+Container.com.yahoo.vespa.hosted.provision.lb.Test
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+Container.com.yahoo.vespa.hosted.provision.node.Test
+Container.com.yahoo.vespa.hosted.provision.node.filter.Test
+Container.com.yahoo.vespa.hosted.provision.os.Test
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+Container.com.yahoo.vespa.hosted.provision.provisioning.Test
+Container.com.yahoo.vespa.hosted.provision.restapi.Test
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+Container.com.yahoo.vespa.hosted.routing.Test
+Container.com.yahoo.vespa.hosted.routing.nginx.Test
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+Container.com.yahoo.vespa.hosted.routing.status.Test
+Container.com.yahoo.vespa.hosted.testrunner.Test
+Container.com.yahoo.vespa.http.server.Test
+Container.com.yahoo.vespa.http.server.util.Test
+Container.com.yahoo.vespa.indexinglanguage.Test
+Container.com.yahoo.vespa.indexinglanguage.expressions.Test
+Container.com.yahoo.vespa.indexinglanguage.linguistics.Test
+Container.com.yahoo.vespa.indexinglanguage.parser.Test
+Container.com.yahoo.vespa.indexinglanguage.predicate.Test
+Container.com.yahoo.vespa.jaxrs.annotation.Test
+Container.com.yahoo.vespa.maven.plugin.enforcer.Test
+Container.com.yahoo.vespa.model.Test
+Container.com.yahoo.vespa.model.admin.Test
+Container.com.yahoo.vespa.model.admin.clustercontroller.Test
+Container.com.yahoo.vespa.model.admin.metricsproxy.Test
+Container.com.yahoo.vespa.model.admin.monitoring.Test
+Container.com.yahoo.vespa.model.admin.monitoring.builder.Test
+Container.com.yahoo.vespa.model.admin.monitoring.builder.xml.Test
+Container.com.yahoo.vespa.model.application.validation.Test
+Container.com.yahoo.vespa.model.application.validation.change.Test
+Container.com.yahoo.vespa.model.application.validation.change.search.Test
+Container.com.yahoo.vespa.model.application.validation.first.Test
+Container.com.yahoo.vespa.model.builder.Test
+Container.com.yahoo.vespa.model.builder.xml.dom.Test
+Container.com.yahoo.vespa.model.builder.xml.dom.chains.Test
+Container.com.yahoo.vespa.model.builder.xml.dom.chains.docproc.Test
+Container.com.yahoo.vespa.model.builder.xml.dom.chains.processing.Test
+Container.com.yahoo.vespa.model.builder.xml.dom.chains.search.Test
+Container.com.yahoo.vespa.model.clients.Test
+Container.com.yahoo.vespa.model.container.Test
+Container.com.yahoo.vespa.model.container.component.Test
+Container.com.yahoo.vespa.model.container.component.chain.Test
+Container.com.yahoo.vespa.model.container.configserver.Test
+Container.com.yahoo.vespa.model.container.configserver.option.Test
+Container.com.yahoo.vespa.model.container.docproc.Test
+Container.com.yahoo.vespa.model.container.docproc.model.Test
+Container.com.yahoo.vespa.model.container.http.Test
+Container.com.yahoo.vespa.model.container.http.ssl.Test
+Container.com.yahoo.vespa.model.container.http.xml.Test
+Container.com.yahoo.vespa.model.container.ml.Test
+Container.com.yahoo.vespa.model.container.processing.Test
+Container.com.yahoo.vespa.model.container.search.Test
+Container.com.yahoo.vespa.model.container.search.searchchain.Test
+Container.com.yahoo.vespa.model.container.search.searchchain.defaultsearchchains.Test
+Container.com.yahoo.vespa.model.container.xml.Test
+Container.com.yahoo.vespa.model.container.xml.document.Test
+Container.com.yahoo.vespa.model.container.xml.embedder.Test
+Container.com.yahoo.vespa.model.content.Test
+Container.com.yahoo.vespa.model.content.cluster.Test
+Container.com.yahoo.vespa.model.content.engines.Test
+Container.com.yahoo.vespa.model.content.storagecluster.Test
+Container.com.yahoo.vespa.model.filedistribution.Test
+Container.com.yahoo.vespa.model.ml.Test
+Container.com.yahoo.vespa.model.routing.Test
+Container.com.yahoo.vespa.model.search.Test
+Container.com.yahoo.vespa.model.utils.Test
+Container.com.yahoo.vespa.model.utils.internal.Test
+Container.com.yahoo.vespa.objects.Test
+Container.com.yahoo.vespa.orchestrator.Test
+Container.com.yahoo.vespa.orchestrator.config.Test
+Container.com.yahoo.vespa.orchestrator.controller.Test
+Container.com.yahoo.vespa.orchestrator.model.Test
+Container.com.yahoo.vespa.orchestrator.policy.Test
+Container.com.yahoo.vespa.orchestrator.resources.Test
+Container.com.yahoo.vespa.orchestrator.restapi.wire.Test
+Container.com.yahoo.vespa.orchestrator.status.Test
+Container.com.yahoo.vespa.orchestrator.status.json.Test
+Container.com.yahoo.vespa.security.tool.securityenv.Test
+Container.com.yahoo.vespa.service.duper.Test
+Container.com.yahoo.vespa.service.executor.Test
+Container.com.yahoo.vespa.service.health.Test
+Container.com.yahoo.vespa.service.manager.Test
+Container.com.yahoo.vespa.service.model.Test
+Container.com.yahoo.vespa.service.monitor.Test
+Container.com.yahoo.vespa.service.slobrok.Test
+Container.com.yahoo.vespastat.Test
+Container.com.yahoo.vespa.streamingvisitors.Test
+Container.com.yahoo.vespa.streamingvisitors.tracing.Test
+Container.com.yahoo.vespasummarybenchmark.Test
+Container.com.yahoo.vespa.test.file.Test
+Container.com.yahoo.vespa.testrunner.Test
+Container.com.yahoo.vespavisit.Test
+Container.com.yahoo.vespaxmlparser.Test
+Container.com.yahoo.vespa.zookeeper.Test
+Container.com.yahoo.vespa.zookeeper.cli.Test
+Container.com.yahoo.vespa.zookeeper.client.Test
+Container.com.yahoo.yolean.Test
+Container.com.yahoo.yolean.chain.Test
+Container.com.yahoo.yolean.concurrent.Test
+Container.com.yahoo.yolean.function.Test
+Container.com.yahoo.yolean.system.Test
+Container.com.yahoo.yolean.trace.Test
diff --git a/client/go/cmd/logfmt/internal_notnames.txt b/client/go/cmd/logfmt/internal_notnames.txt
new file mode 100644
index 00000000000..49543758ac3
--- /dev/null
+++ b/client/go/cmd/logfmt/internal_notnames.txt
@@ -0,0 +1,8 @@
+Container.ai.onnx.Test
+Container.com.fasterxml.jackson.jaxrs.json.Test
+Container.com.google.Test
+Container.com.yahooapis.foo.Test
+Container.com.yahoo.newssearch.Test
+Container.com.yahoo.Test
+Container.com.yahoo.testing.Test
+Container.org.apache.http.Test
diff --git a/client/go/cmd/logfmt/internal_test.go b/client/go/cmd/logfmt/internal_test.go
new file mode 100644
index 00000000000..9b6b0f8404c
--- /dev/null
+++ b/client/go/cmd/logfmt/internal_test.go
@@ -0,0 +1,34 @@
+package logfmt
+
+import (
+	"bufio"
+	"os"
+	"testing"
+)
+
+// tests: func isInternal(componentName string) bool
+
+func TestIsInternal(t *testing.T) {
+	f, err := os.Open("internal_names.txt")
+	if err != nil {
+		t.Fatal("could not read test data")
+	}
+	defer f.Close()
+	for input := bufio.NewScanner(f); input.Scan(); {
+		if name := input.Text(); !isInternal(name) {
+			t.Logf("name '%s' should be internal but was not recognized", name)
+			t.Fail()
+		}
+	}
+	f, err = os.Open("internal_notnames.txt")
+	if err != nil {
+		t.Fatal("could not read test data")
+	}
+	defer f.Close()
+	for input := bufio.NewScanner(f); input.Scan(); {
+		if name := input.Text(); isInternal(name) {
+			t.Logf("name '%s' should not be internal but was recognized", name)
+			t.Fail()
+		}
+	}
+}
diff --git a/client/go/cmd/logfmt/levelflags.go b/client/go/cmd/logfmt/levelflags.go
new file mode 100644
index 00000000000..4e6c1284753
--- /dev/null
+++ b/client/go/cmd/logfmt/levelflags.go
@@ -0,0 +1,72 @@
+// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+// vespa logfmt command
+// Author: arnej
+
+package logfmt
+
+import (
+	"strings"
+)
+
+// handle CLI flags for log level filtering
+
+type flagValueForLevel struct {
+	levels  map[string]bool
+	changed bool
+}
+
+func defaultLevelFlags() map[string]bool {
+	return map[string]bool{
+		"fatal":   true,
+		"error":   true,
+		"warning": true,
+		"info":    true,
+		"config":  false,
+		"event":   false,
+		"debug":   false,
+		"spam":    false,
+	}
+}
+
+func (v *flagValueForLevel) Type() string {
+	return "level flags"
+}
+
+func (v *flagValueForLevel) String() string {
+	var buf strings.Builder
+	flagNames := []string{
+		"fatal",
+		"error",
+		"warning",
+		"info",
+		"config",
+		"event",
+		"debug",
+		"spam",
+	}
+	for _, flag := range flagNames {
+		if v.levels[flag] {
+			buf.WriteString(" +")
+		} else {
+			buf.WriteString(" -")
+		}
+		buf.WriteString(flag)
+	}
+	return buf.String()
+}
+
+func (v *flagValueForLevel) flags() map[string]bool {
+	return v.levels
+}
+
+func (v *flagValueForLevel) name() string {
+	return "level"
+}
+
+func (v *flagValueForLevel) unchanged() bool {
+	return !v.changed
+}
+
+func (v *flagValueForLevel) Set(val string) error {
+	return applyPlusMinus(val, v)
+}
diff --git a/client/go/cmd/logfmt/levelflags_test.go b/client/go/cmd/logfmt/levelflags_test.go
new file mode 100644
index 00000000000..186ea2d96b0
--- /dev/null
+++ b/client/go/cmd/logfmt/levelflags_test.go
@@ -0,0 +1,74 @@
+// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+// vespa logfmt command
+// Author: arnej
+
+package logfmt
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestLevelFlags(t *testing.T) {
+	none := " -fatal -error -warning -info -config -event -debug -spam"
+
+	var flag flagValueForLevel
+	if flag.String() != none {
+		t.Logf("unset flag displays as '%s', expected '%s'", flag.String(), none)
+		t.Fail()
+	}
+	if flag.Type() != "level flags" {
+		t.Logf("flag type was '%s'", flag.Type())
+		t.Fail()
+	}
+	check := func(expected string, texts ...string) {
+		var target flagValueForLevel
+		// target.levels = defaultLevelFlags()
+		target.levels = defaultLevelFlags()
+		for _, text := range texts {
+			err := target.Set(text)
+			if err != nil {
+				t.Fatalf("unexpected error with level flags Set('%s'): %v", text, err)
+			}
+		}
+		got := target.String()
+		if got != expected {
+			t.Logf("expected flags [%s] but got: [%s]", expected, got)
+			t.Fail()
+		}
+	}
+	check(" +fatal +error +warning +info -config -event -debug -spam")
+	check(" -fatal -error -warning -info -config -event -debug -spam", "-all")
+	check(" +fatal +error +warning +info +config +event +debug +spam", "all")
+	check(" +fatal +error +warning +info +config +event +debug +spam", "+all")
+	check(" -fatal -error -warning -info -config -event +debug -spam", "debug")
+	check(" +fatal +error +warning +info +config +event +debug -spam", "all-spam")
+	check(" +fatal +error +warning +info +config +event +debug -spam", "all", "-spam")
+	check(" +fatal +error +warning -info -config +event -debug -spam", "+event", "-info")
+	check(" +fatal +error -warning -info -config +event -debug -spam", "+event,-info,-warning,config")
+	check(" +fatal +error -warning -info +config +event -debug -spam", "+event,-info,-warning,+config")
+	check(" +fatal +error -warning -info +config +event -debug -spam", "+event,-info", "-warning,+config")
+	check(" -fatal -error -warning -info +config -event -debug -spam", "+event", "-info", "-warning", "config")
+	check = func(expectErr string, texts ...string) {
+		var target flagValueForLevel
+		target.levels = defaultLevelFlags()
+		for _, text := range texts {
+			err := target.Set(text)
+			if err != nil {
+				if err.Error() == expectErr {
+					return
+				}
+				t.Fatalf("expected error [%s] with level flags Set('%s'), but got [%v]", expectErr, text, err)
+			}
+		}
+		t.Logf("Did not get expected error '%s' from %s", expectErr, strings.Join(texts, ","))
+		t.Fail()
+	}
+	check("not a valid level flag: 'foo'", "foo")
+	check("not a valid level flag: 'foo'", "event,foo,config")
+	check("not a valid level flag: 'foo'", "-event,-foo,-config")
+	check("not a valid level flag: 'foo'", "+event,+foo,+config")
+	check("not a valid level flag: 'foo'", "event", "foo", "config")
+	check("not a valid level flag: 'foo'", "-event", "-foo", "-config")
+	check("not a valid level flag: 'foo'", "+event", "+foo", "+config")
+}
diff --git a/client/go/cmd/logfmt/options.go b/client/go/cmd/logfmt/options.go
new file mode 100644
index 00000000000..f564ffd4df0
--- /dev/null
+++ b/client/go/cmd/logfmt/options.go
@@ -0,0 +1,47 @@
+// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+// vespa logfmt command
+// Author: arnej
+
+package logfmt
+
+import (
+	"fmt"
+	"os"
+)
+
+// options designed for compatibility with perl version of vespa-logfmt
+
+type Options struct {
+	ShowFields        flagValueForShow
+	ShowLevels        flagValueForLevel
+	OnlyHostname      string
+	OnlyPid           string
+	OnlyService       string
+	OnlyInternal      bool
+	FollowTail        bool
+	DequoteNewlines   bool
+	TruncateService   bool
+	TruncateComponent bool
+	ComponentFilter   regexFlag
+	MessageFilter     regexFlag
+}
+
+func NewOptions() (ret Options) {
+	ret.ShowLevels.levels = defaultLevelFlags()
+	ret.ShowFields.shown = defaultShowFlags()
+	return
+}
+
+func (o *Options) showField(field string) bool {
+	return o.ShowFields.shown[field]
+}
+
+func (o *Options) showLevel(level string) bool {
+	rv, ok := o.ShowLevels.levels[level]
+	if !ok {
+		o.ShowLevels.levels[level] = true
+		fmt.Fprintf(os.Stderr, "Warnings: unknown level '%s' in input\n", level)
+		return true
+	}
+	return rv
+}
diff --git a/client/go/cmd/logfmt/plusminusflag.go b/client/go/cmd/logfmt/plusminusflag.go
new file mode 100644
index 00000000000..1768cf0e7be
--- /dev/null
+++ b/client/go/cmd/logfmt/plusminusflag.go
@@ -0,0 +1,67 @@
+// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+// vespa logfmt command
+// Author: arnej
+
+package logfmt
+
+import (
+	"fmt"
+	"strings"
+)
+
+// common code for showFlags and levelFlags
+
+type plusMinusFlag interface {
+	flags() map[string]bool
+	name() string
+	unchanged() bool
+}
+
+func trimPrefix(value, prefix string) (newValue string, hadPrefix bool) {
+	hadPrefix = strings.HasPrefix(value, prefix)
+	if hadPrefix {
+		newValue = strings.TrimPrefix(value, prefix)
+	} else {
+		newValue = value
+	}
+	return
+}
+
+func applyPlusMinus(val string, target plusMinusFlag) error {
+	minus := strings.HasPrefix(val, "-")
+	plus := strings.HasPrefix(val, "+")
+	val = strings.ReplaceAll(val, "-", ",-")
+	val = strings.ReplaceAll(val, "+", ",+")
+	if target.unchanged() {
+		// user wants to reset flags?
+		if minus == false && plus == false {
+			for k, _ := range target.flags() {
+				target.flags()[k] = false
+			}
+		}
+	}
+	changeTo := !minus
+	for _, k := range strings.Split(val, ",") {
+		if suppress, minus := trimPrefix(k, "-"); minus {
+			k = suppress
+			changeTo = false
+		}
+		if surface, plus := trimPrefix(k, "+"); plus {
+			k = surface
+			changeTo = true
+		}
+		if k == "" {
+			continue
+		}
+		if k == "all" {
+			for k, _ := range target.flags() {
+				target.flags()[k] = changeTo
+			}
+		} else if _, ok := target.flags()[k]; !ok {
+			return fmt.Errorf("not a valid %s flag: '%s'", target.name(), k)
+		} else {
+			target.flags()[k] = changeTo
+		}
+	}
+	return nil
+}
diff --git a/client/go/cmd/logfmt/regexflag.go b/client/go/cmd/logfmt/regexflag.go
new file mode 100644
index 00000000000..8f7d2a91373
--- /dev/null
+++ b/client/go/cmd/logfmt/regexflag.go
@@ -0,0 +1,38 @@
+// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+// vespa logfmt command
+// Author: arnej
+
+package logfmt
+
+import (
+	"regexp"
+)
+
+// optional regular expression filter, as a CLI flag
+
+type regexFlag struct {
+	regex *regexp.Regexp
+}
+
+func (re regexFlag) unmatched(s string) bool {
+	if re.regex == nil {
+		return false
+	}
+	return re.regex.FindStringIndex(s) == nil
+}
+
+func (v *regexFlag) Type() string {
+	return "regular expression"
+}
+
+func (v *regexFlag) String() string {
+	if v.regex == nil {
+		return "<none>"
+	}
+	return v.regex.String()
+}
+
+func (v *regexFlag) Set(val string) (r error) {
+	v.regex, r = regexp.Compile(val)
+	return
+}
diff --git a/client/go/cmd/logfmt/regexflag_test.go b/client/go/cmd/logfmt/regexflag_test.go
new file mode 100644
index 00000000000..489439863a2
--- /dev/null
+++ b/client/go/cmd/logfmt/regexflag_test.go
@@ -0,0 +1,41 @@
+// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+// vespa logfmt command
+// Author: arnej
+
+package logfmt
+
+import (
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"testing"
+)
+
+func assertMatch(t *testing.T, re string, flag *regexFlag, texts ...string) {
+	t.Helper()
+	err := flag.Set(re)
+	require.Nil(t, err, "unexpected error with flag.Set('%s'): %v", re, err)
+	assert.Equal(t, re, flag.String(), "set flag displays as '%s', expected '%s'", flag.String(), re)
+	for _, text := range texts {
+		assert.False(t, flag.unmatched(text), "flag '%s' claims a non-match for '%s'", flag.String(), text)
+	}
+}
+
+func assertUnmatch(t *testing.T, re string, flag *regexFlag, texts ...string) {
+	t.Helper()
+	err := flag.Set(re)
+	require.Nil(t, err, "unexpected error with flag.Set('%s'): %v", re, err)
+	assert.Equal(t, re, flag.String())
+	for _, text := range texts {
+		assert.True(t, flag.unmatched(text), "flag '%s' should claim a non-match for '%s'", flag.String(), text)
+	}
+}
+
+func TestRegexFlag(t *testing.T) {
+	var flag regexFlag
+	assert.Equal(t, "<none>", flag.String())
+	assert.Equal(t, "regular expression", flag.Type())
+	assert.False(t, flag.unmatched("foobar"), "unset flag claims a non-match")
+	assert.EqualError(t, flag.Set("*"), "error parsing regexp: missing argument to repetition operator: `*`")
+	assertMatch(t, "foo.*bar", new(regexFlag), "foobar", "foo bar", "x foobar y", "xfoobary", "xfooybarz")
+	assertUnmatch(t, "foo.*bar", new(regexFlag), "Foobar", "foo Bar", "fxoobar", "whatever")
+}
diff --git a/client/go/cmd/logfmt/runlogfmt.go b/client/go/cmd/logfmt/runlogfmt.go
new file mode 100644
index 00000000000..9d782692f50
--- /dev/null
+++ b/client/go/cmd/logfmt/runlogfmt.go
@@ -0,0 +1,78 @@
+// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+// vespa logfmt command
+// Author: arnej
+
+package logfmt
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+
+	"github.com/mattn/go-isatty"
+)
+
+func inputIsTty() bool {
+	return isatty.IsTerminal(os.Stdin.Fd())
+}
+
+func vespaHome() string {
+	ev := os.Getenv("VESPA_HOME")
+	if ev == "" {
+		return "/opt/vespa"
+	}
+	return ev
+}
+
+// main entry point for vespa-logfmt
+
+func RunLogfmt(opts *Options, args []string) {
+	if len(args) == 0 {
+		if inputIsTty() {
+			args = append(args, vespaHome()+"/logs/vespa/vespa.log")
+		} else {
+			formatFile(opts, os.Stdin)
+		}
+	}
+	if opts.FollowTail {
+		if len(args) != 1 {
+			fmt.Fprintf(os.Stderr, "Must have exact 1 file for 'follow' option, got %d\n", len(args))
+			return
+		}
+		tailFile(opts, args[0])
+		return
+	}
+	for _, arg := range args {
+		file, err := os.Open(arg)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "Cannot open '%s': %v\n", arg, err)
+		} else {
+			formatFile(opts, file)
+			file.Close()
+		}
+	}
+}
+
+func formatLine(opts *Options, line string) {
+	output, err := handleLine(opts, line)
+	if err != nil {
+		fmt.Fprintln(os.Stderr, "bad log line:", err)
+	} else {
+		os.Stdout.WriteString(output)
+	}
+}
+
+func tailFile(opts *Options, fn string) {
+	tailed := FollowFile(fn)
+	for line := range tailed.Lines {
+		formatLine(opts, line.Text)
+	}
+}
+
+func formatFile(opts *Options, arg *os.File) {
+	input := bufio.NewScanner(arg)
+	input.Buffer(make([]byte, 64*1024), 4*1024*1024)
+	for input.Scan() {
+		formatLine(opts, input.Text())
+	}
+}
diff --git a/client/go/cmd/logfmt/showflags.go b/client/go/cmd/logfmt/showflags.go
new file mode 100644
index 00000000000..b69860e0312
--- /dev/null
+++ b/client/go/cmd/logfmt/showflags.go
@@ -0,0 +1,76 @@
+// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+// vespa logfmt command
+// Author: arnej
+
+package logfmt
+
+import (
+	"strings"
+)
+
+// handle CLI flags for which fields to show when formatting a line
+
+type flagValueForShow struct {
+	shown   map[string]bool
+	changed bool
+}
+
+func defaultShowFlags() map[string]bool {
+	return map[string]bool{
+		"time":      true,
+		"fmttime":   true,
+		"msecs":     true,
+		"usecs":     false,
+		"host":      false,
+		"level":     true,
+		"pid":       false,
+		"service":   true,
+		"component": true,
+		"message":   true,
+	}
+}
+
+func (v *flagValueForShow) Type() string {
+	return "show flags"
+}
+
+func (v *flagValueForShow) String() string {
+	var buf strings.Builder
+	flagNames := []string{
+		"time",
+		"fmttime",
+		"msecs",
+		"usecs",
+		"host",
+		"level",
+		"pid",
+		"service",
+		"component",
+		"message",
+	}
+	for _, flag := range flagNames {
+		if v.shown[flag] {
+			buf.WriteString(" +")
+		} else {
+			buf.WriteString(" -")
+		}
+		buf.WriteString(flag)
+	}
+	return buf.String()
+}
+
+func (v *flagValueForShow) flags() map[string]bool {
+	return v.shown
+}
+
+func (v *flagValueForShow) name() string {
+	return "show"
+}
+
+func (v *flagValueForShow) unchanged() bool {
+	return !v.changed
+}
+
+func (v *flagValueForShow) Set(val string) error {
+	return applyPlusMinus(val, v)
+}
diff --git a/client/go/cmd/logfmt/showflags_test.go b/client/go/cmd/logfmt/showflags_test.go
new file mode 100644
index 00000000000..d1b66118afd
--- /dev/null
+++ b/client/go/cmd/logfmt/showflags_test.go
@@ -0,0 +1,61 @@
+// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+// vespa logfmt command
+// Author: arnej
+
+package logfmt
+
+import (
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"strings"
+	"testing"
+)
+
+func TestShowFlags(t *testing.T) {
+	none := " -time -fmttime -msecs -usecs -host -level -pid -service -component -message"
+	var flag flagValueForShow
+	assert.Equal(t, none, flag.String(), "unset flag displays as '%s', expected '%s'", flag.String(), none)
+	assert.Equal(t, "show flags", flag.Type())
+	check := func(expected string, texts ...string) {
+		var target flagValueForShow
+		// target.levels = defaultLevelFlags()
+		target.shown = defaultShowFlags()
+		for _, text := range texts {
+			err := target.Set(text)
+			require.Nil(t, err, "unexpected error with show flags Set('%s'): %v", text, err)
+		}
+		assert.Equal(t, expected, target.String())
+	}
+	check(" +time +fmttime +msecs -usecs -host +level -pid +service +component +message")
+	check(" -time -fmttime -msecs -usecs -host -level -pid -service -component -message", "-all")
+	check(" +time +fmttime +msecs +usecs +host +level +pid +service +component +message", "all")
+	check(" +time +fmttime +msecs +usecs +host +level +pid +service +component +message", "+all")
+	check(" -time -fmttime -msecs -usecs -host -level +pid -service -component -message", "pid")
+	check(" +time +fmttime +msecs +usecs -host +level +pid +service +component +message", "all-host")
+	check(" +time +fmttime +msecs +usecs -host +level +pid +service +component +message", "all", "-host")
+	check(" +time +fmttime -msecs -usecs -host +level +pid +service +component +message", "+pid", "-msecs")
+	check(" +time -fmttime +msecs -usecs +host +level -pid -service +component +message", "+host,-fmttime,-service,pid")
+	check(" +time -fmttime +msecs -usecs +host +level +pid -service +component +message", "+host,-fmttime,-service,+pid")
+	check(" +time -fmttime +msecs -usecs +host +level +pid -service +component +message", "+host,-fmttime", "-service,+pid")
+	check(" -time -fmttime -msecs -usecs -host -level +pid -service -component -message", "+host", "-fmttime", "-service", "pid")
+	check = func(expectErr string, texts ...string) {
+		var target flagValueForShow
+		target.shown = defaultShowFlags()
+		for _, text := range texts {
+			err := target.Set(text)
+			if err != nil {
+				require.Equal(t, expectErr, err.Error())
+				return
+			}
+		}
+		t.Logf("Did not get expected error [%s] from %s", expectErr, strings.Join(texts, " "))
+		t.Fail()
+	}
+	check("not a valid show flag: 'foo'", "foo")
+	check("not a valid show flag: 'foo'", "level,foo,message")
+	check("not a valid show flag: 'foo'", "-level,-foo,-message")
+	check("not a valid show flag: 'foo'", "+level,+foo,+message")
+	check("not a valid show flag: 'foo'", "level", "foo", "message")
+	check("not a valid show flag: 'foo'", "-level", "-foo", "-message")
+	check("not a valid show flag: 'foo'", "+level", "+foo", "+message")
+}
diff --git a/client/go/cmd/logfmt/tail.go b/client/go/cmd/logfmt/tail.go
new file mode 100644
index 00000000000..443656436c1
--- /dev/null
+++ b/client/go/cmd/logfmt/tail.go
@@ -0,0 +1,156 @@
+// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+// vespa logfmt command
+// Author: arnej
+
+package logfmt
+
+import (
+	"bufio"
+	"fmt"
+	"io"
+	"os"
+	"time"
+)
+
+const lastLinesSize = 4 * 1024
+
+type Line struct {
+	Text string
+}
+
+// an active "tail -f" like object
+
+type Tail struct {
+	Lines   chan Line
+	lineBuf []byte
+	curFile *os.File
+	fn      string
+	reader  *bufio.Reader
+}
+
+// API for starting to follow a log file
+
+func FollowFile(fn string) (res Tail) {
+	res.fn = fn
+	res.lineBuf = make([]byte, lastLinesSize)
+	res.openTail()
+	res.Lines = make(chan Line, 20)
+	res.lineBuf = res.lineBuf[:0]
+	go runTailWith(&res)
+	return res
+}
+
+func (t *Tail) setFile(f *os.File) {
+	if t.curFile != nil {
+		t.curFile.Close()
+	}
+	t.curFile = f
+	if f != nil {
+		t.reader = bufio.NewReaderSize(f, 1024*1024)
+	} else {
+		t.reader = nil
+	}
+}
+
+// open log file and seek to the start of a line near the end, if possible.
+func (t *Tail) openTail() {
+	file, err := os.Open(t.fn)
+	if err != nil {
+		return
+	}
+	sz, err := file.Seek(0, os.SEEK_END)
+	if err != nil {
+		return
+	}
+	if sz < lastLinesSize {
+		sz, err = file.Seek(0, os.SEEK_SET)
+		if err == nil {
+			// just read from start of file, all OK
+			t.setFile(file)
+		}
+		return
+	}
+	sz, _ = file.Seek(-lastLinesSize, os.SEEK_END)
+	n, err := file.Read(t.lineBuf)
+	if err != nil {
+		return
+	}
+	for i := 0; i < n; i++ {
+		if t.lineBuf[i] == '\n' {
+			sz, err = file.Seek(sz+int64(i+1), os.SEEK_SET)
+			if err == nil {
+				t.setFile(file)
+			}
+			return
+		}
+	}
+}
+
+func (t *Tail) reopen(oldSize int64) {
+	for cnt := 0; cnt < 100; cnt++ {
+		file, r := os.Open(t.fn)
+		if r != nil {
+			t.setFile(nil)
+			if cnt == 0 {
+				fmt.Fprintf(os.Stderr, "%v (waiting for log file to appear)\n", r)
+			}
+			time.Sleep(1000 * time.Millisecond)
+			continue
+		}
+		sz, _ := file.Seek(0, os.SEEK_END)
+		if sz != oldSize {
+			file.Seek(0, os.SEEK_SET)
+			if t.curFile != nil {
+				t.curFile.Close()
+			}
+			t.setFile(file)
+		} else {
+			// same size, same file (probably), continue following it
+			file.Close()
+		}
+		return
+	}
+}
+
+// runs as a goroutine
+func runTailWith(t *Tail) {
+	defer t.setFile(nil)
+loop:
+	for {
+		for t.curFile == nil {
+			t.reopen(-1)
+		}
+		bytes, err := t.reader.ReadSlice('\n')
+		t.lineBuf = append(t.lineBuf, bytes...)
+		if err == bufio.ErrBufferFull {
+			continue
+		}
+		if err == nil {
+			ll := len(t.lineBuf) - 1
+			t.Lines <- Line{Text: string(t.lineBuf[:ll])}
+			t.lineBuf = t.lineBuf[:0]
+			continue
+		}
+		if err == io.EOF {
+			pos, _ := t.curFile.Seek(0, os.SEEK_CUR)
+			for cnt := 0; cnt < 100; cnt++ {
+				time.Sleep(10 * time.Millisecond)
+				sz, _ := t.curFile.Seek(0, os.SEEK_END)
+				if sz != pos {
+					if sz < pos {
+						// truncation case
+						pos = 0
+					}
+					t.curFile.Seek(pos, os.SEEK_SET)
+					continue loop
+				}
+			}
+			// no change in file size, try reopening
+			t.reopen(pos)
+		} else {
+			fmt.Fprintf(os.Stderr, "error tailing '%s': %v\n", t.fn, err)
+			close(t.Lines)
+			return
+		}
+	}
+}