add docker log source (enhanced pull request #125)

Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.20
+FROM golang:1.23
 
 COPY . /work
 WORKDIR /work

README.adoc

@@ -16,6 +16,9 @@ image:https://img.shields.io/badge/donate-PayPal-yellow[link="https://www.paypal
 
 Helper tool that continuously reads an NGINX log file (or any kind of similar log file) and exports metrics to https://prometheus.io/[Prometheus].
 
+*Added the ability to export logs from Docker (enhanced pull request https://github.com/martin-helmich/prometheus-nginxlog-exporter/pull/125[#125] from the original repository).*
+
+
 [discrete]
 == Contents
 
@@ -358,6 +361,48 @@ namespaces:
 
 Advanced features
 -----------------
+
+### Reading from Docker logs
+If Nginx is running in a docker container and is configured to log to `/dev/stdout` and `/dev/stderr` (this is the
+default configuration of the official `nginx` image), then you can export logs using Docker's default logging driver.
+To do this use a source configuration as follows:
+[source,hcl]
+----
+namespace "test" {
+  source {
+    docker {
+      container = "nginx_container_name"
+    }
+
+    // ...
+  }
+}
+----
+[source,yaml]
+----
+#...
+
+namespaces:
+  - name: nginx
+    format: "format"
+    source:
+      docker:
+        container: nginx_container_name
+
+#...
+----
+The host's docker socket needs to be mounted to the container. For example, if using the docker run command as follows:
+[source]
+----
+$ docker run \
+    --name nginx-exporter \
+    -v /var/run/docker.sock:/var/run/docker.sock \
+    -v /path/to/config.hcl:/etc/prometheus-nginxlog-exporter.hcl \
+    -p 4040:4040 \
+    quay.io/martinhelmich/prometheus-nginxlog-exporter \
+    -config-file /etc/prometheus-nginxlog-exporter.hcl \
+----
+
 ### Namespace as labels
 
 For historic reasons, this exporter exports separate metrics for different

go.mod

@@ -1,50 +1,73 @@
 module github.com/martin-helmich/prometheus-nginxlog-exporter
 
-go 1.20
+go 1.23
 
 require (
-	github.com/hashicorp/consul/api v1.26.1
+	github.com/docker/docker v27.3.1+incompatible
+	github.com/hashicorp/consul/api v1.30.0
 	github.com/hashicorp/hcl v1.0.0
-	github.com/nxadm/tail v1.4.8
+	github.com/nxadm/tail v1.4.11
 	github.com/pkg/errors v0.9.1
-	github.com/prometheus/client_golang v1.17.0
-	github.com/prometheus/common v0.44.0
+	github.com/prometheus/client_golang v1.20.5
 	github.com/satyrius/gonx v1.4.0
-	github.com/stretchr/testify v1.8.4
-	go.uber.org/zap v1.24.0
+	github.com/stretchr/testify v1.9.0
+	go.uber.org/zap v1.27.0
+	golang.org/x/net v0.30.0
 	gopkg.in/mcuadros/go-syslog.v2 v2.3.0
 	gopkg.in/yaml.v3 v3.0.1
 )
 
 require (
+	github.com/Microsoft/go-winio v0.6.2 // indirect
 	github.com/armon/go-metrics v0.4.1 // indirect
 	github.com/beorn7/perks v1.0.1 // indirect
-	github.com/cespare/xxhash/v2 v2.2.0 // indirect
+	github.com/cespare/xxhash/v2 v2.3.0 // indirect
+	github.com/containerd/log v0.1.0 // indirect
 	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
-	github.com/fatih/color v1.14.1 // indirect
-	github.com/fsnotify/fsnotify v1.4.9 // indirect
-	github.com/golang/protobuf v1.5.3 // indirect
+	github.com/distribution/reference v0.6.0 // indirect
+	github.com/docker/go-connections v0.5.0 // indirect
+	github.com/docker/go-units v0.5.0 // indirect
+	github.com/fatih/color v1.18.0 // indirect
+	github.com/felixge/httpsnoop v1.0.4 // indirect
+	github.com/fsnotify/fsnotify v1.8.0 // indirect
+	github.com/go-logr/logr v1.4.2 // indirect
+	github.com/go-logr/stdr v1.2.2 // indirect
+	github.com/gogo/protobuf v1.3.2 // indirect
 	github.com/hashicorp/errwrap v1.1.0 // indirect
 	github.com/hashicorp/go-cleanhttp v0.5.2 // indirect
-	github.com/hashicorp/go-hclog v1.5.0 // indirect
+	github.com/hashicorp/go-hclog v1.6.3 // indirect
 	github.com/hashicorp/go-immutable-radix v1.3.1 // indirect
 	github.com/hashicorp/go-multierror v1.1.1 // indirect
 	github.com/hashicorp/go-rootcerts v1.0.2 // indirect
-	github.com/hashicorp/golang-lru v0.5.4 // indirect
+	github.com/hashicorp/golang-lru v1.0.2 // indirect
 	github.com/hashicorp/serf v0.10.1 // indirect
+	github.com/klauspost/compress v1.17.11 // indirect
 	github.com/mattn/go-colorable v0.1.13 // indirect
-	github.com/mattn/go-isatty v0.0.17 // indirect
-	github.com/matttproud/golang_protobuf_extensions v1.0.4 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
 	github.com/mitchellh/go-homedir v1.1.0 // indirect
 	github.com/mitchellh/mapstructure v1.5.0 // indirect
+	github.com/moby/docker-image-spec v1.3.1 // indirect
+	github.com/moby/term v0.5.0 // indirect
+	github.com/morikuni/aec v1.0.0 // indirect
+	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
+	github.com/opencontainers/go-digest v1.0.0 // indirect
+	github.com/opencontainers/image-spec v1.1.0 // indirect
 	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
-	github.com/prometheus/client_model v0.4.1-0.20230718164431-9a2bf3000d16 // indirect
-	github.com/prometheus/procfs v0.11.1 // indirect
+	github.com/prometheus/client_model v0.6.1 // indirect
+	github.com/prometheus/common v0.60.1 // indirect
+	github.com/prometheus/procfs v0.15.1 // indirect
 	github.com/smartystreets/goconvey v1.8.1 // indirect
-	go.uber.org/atomic v1.7.0 // indirect
-	go.uber.org/multierr v1.6.0 // indirect
-	golang.org/x/exp v0.0.0-20230817173708-d852ddb80c63 // indirect
-	golang.org/x/sys v0.13.0 // indirect
-	google.golang.org/protobuf v1.31.0 // indirect
+	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.56.0 // indirect
+	go.opentelemetry.io/otel v1.31.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.31.0 // indirect
+	go.opentelemetry.io/otel/metric v1.31.0 // indirect
+	go.opentelemetry.io/otel/sdk v1.31.0 // indirect
+	go.opentelemetry.io/otel/trace v1.31.0 // indirect
+	go.uber.org/multierr v1.11.0 // indirect
+	golang.org/x/exp v0.0.0-20241009180824-f66d83c29e7c // indirect
+	golang.org/x/sys v0.26.0 // indirect
+	golang.org/x/time v0.7.0 // indirect
+	google.golang.org/protobuf v1.35.1 // indirect
 	gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 // indirect
+	gotest.tools/v3 v3.5.1 // indirect
 )