move prometheus from go.opencensus.io repo.

.gitignore

@@ -0,0 +1 @@
+/.idea/

.travis.yml

@@ -0,0 +1,17 @@
+language: go
+
+go_import_path: contrib.go.opencensus.io
+
+go:
+  - 1.11.x
+
+env:
+  global:
+    GO111MODULE=on
+
+before_script:
+  - make install-tools
+
+script:
+  - make travis-ci
+

Makefile

@@ -0,0 +1,95 @@
+# TODO: Fix this on windows.
+ALL_SRC := $(shell find . -name '*.go' \
+								-not -path './vendor/*' \
+								-not -path '*/gen-go/*' \
+								-type f | sort)
+ALL_PKGS := $(shell go list $(sort $(dir $(ALL_SRC))))
+
+GOTEST_OPT?=-v -race -timeout 30s
+GOTEST_OPT_WITH_COVERAGE = $(GOTEST_OPT) -coverprofile=coverage.txt -covermode=atomic
+GOTEST=go test
+GOFMT=gofmt
+GOLINT=golint
+GOVET=go vet
+EMBEDMD=embedmd
+# TODO decide if we need to change these names.
+README_FILES := $(shell find . -name '*README.md' | sort | tr '\n' ' ')
+
+
+.DEFAULT_GOAL := fmt-lint-vet-embedmd-test
+
+.PHONY: fmt-lint-vet-embedmd-test
+fmt-lint-vet-embedmd-test: fmt lint vet embedmd test
+
+# TODO enable test-with-coverage in tavis
+.PHONY: travis-ci
+travis-ci: fmt lint vet embedmd test test-386
+
+all-pkgs:
+	@echo $(ALL_PKGS) | tr ' ' '\n' | sort
+
+all-srcs:
+	@echo $(ALL_SRC) | tr ' ' '\n' | sort
+
+.PHONY: test
+test:
+	$(GOTEST) $(GOTEST_OPT) $(ALL_PKGS)
+
+.PHONY: test-386
+test-386:
+	GOARCH=386 $(GOTEST) -v -timeout 30s $(ALL_PKGS)
+
+.PHONY: test-with-coverage
+test-with-coverage:
+	$(GOTEST) $(GOTEST_OPT_WITH_COVERAGE) $(ALL_PKGS)
+
+.PHONY: fmt
+fmt:
+	@FMTOUT=`$(GOFMT) -s -l $(ALL_SRC) 2>&1`; \
+	if [ "$$FMTOUT" ]; then \
+		echo "$(GOFMT) FAILED => gofmt the following files:\n"; \
+		echo "$$FMTOUT\n"; \
+		exit 1; \
+	else \
+	    echo "Fmt finished successfully"; \
+	fi
+
+.PHONY: lint
+lint:
+	@LINTOUT=`$(GOLINT) $(ALL_PKGS) 2>&1`; \
+	if [ "$$LINTOUT" ]; then \
+		echo "$(GOLINT) FAILED => clean the following lint errors:\n"; \
+		echo "$$LINTOUT\n"; \
+		exit 1; \
+	else \
+	    echo "Lint finished successfully"; \
+	fi
+
+.PHONY: vet
+vet:
+    # TODO: Understand why go vet downloads "github.com/google/go-cmp v0.2.0"
+	@VETOUT=`$(GOVET) ./... | grep -v "go: downloading" 2>&1`; \
+	if [ "$$VETOUT" ]; then \
+		echo "$(GOVET) FAILED => go vet the following files:\n"; \
+		echo "$$VETOUT\n"; \
+		exit 1; \
+	else \
+	    echo "Vet finished successfully"; \
+	fi
+
+.PHONY: embedmd
+embedmd:
+	@EMBEDMDOUT=`$(EMBEDMD) -d $(README_FILES) 2>&1`; \
+	if [ "$$EMBEDMDOUT" ]; then \
+		echo "$(EMBEDMD) FAILED => embedmd the following files:\n"; \
+		echo "$$EMBEDMDOUT\n"; \
+		exit 1; \
+	else \
+	    echo "Embedmd finished successfully"; \
+	fi
+
+.PHONY: install-tools
+install-tools:
+	go get -u golang.org/x/tools/cmd/cover
+	go get -u golang.org/x/lint/golint
+	go get -u github.com/rakyll/embedmd

README.md

@@ -1 +1,2 @@
-# opencensus-go-exporter-prometheus
+# opencensus-go-exporter-prometheus
+

example/main.go

@@ -0,0 +1,83 @@
+// Copyright 2017, OpenCensus 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.
+
+// Command prometheus is an example program that collects data for
+// video size. Collected data is exported to Prometheus.
+package main
+
+import (
+	"context"
+	"log"
+	"math/rand"
+	"net/http"
+	"time"
+
+	"go.opencensus.io/exporter/prometheus"
+	"go.opencensus.io/stats"
+	"go.opencensus.io/stats/view"
+)
+
+// Create measures. The program will record measures for the size of
+// processed videos and the number of videos marked as spam.
+var (
+	videoCount = stats.Int64("example.com/measures/video_count", "number of processed videos", stats.UnitDimensionless)
+	videoSize  = stats.Int64("example.com/measures/video_size", "size of processed video", stats.UnitBytes)
+)
+
+func main() {
+	ctx := context.Background()
+
+	exporter, err := prometheus.NewExporter(prometheus.Options{})
+	if err != nil {
+		log.Fatal(err)
+	}
+	view.RegisterExporter(exporter)
+
+	// Create view to see the number of processed videos cumulatively.
+	// Create view to see the amount of video processed
+	// Subscribe will allow view data to be exported.
+	// Once no longer needed, you can unsubscribe from the view.
+	if err = view.Register(
+		&view.View{
+			Name:        "video_count",
+			Description: "number of videos processed over time",
+			Measure:     videoCount,
+			Aggregation: view.Count(),
+		},
+		&view.View{
+			Name:        "video_size",
+			Description: "processed video size over time",
+			Measure:     videoSize,
+			Aggregation: view.Distribution(0, 1<<16, 1<<32),
+		},
+	); err != nil {
+		log.Fatalf("Cannot register the view: %v", err)
+	}
+
+	// Set reporting period to report data at every second.
+	view.SetReportingPeriod(1 * time.Second)
+
+	// Record some data points...
+	go func() {
+		for {
+			stats.Record(ctx, videoCount.M(1), videoSize.M(rand.Int63()))
+			<-time.After(time.Millisecond * time.Duration(1+rand.Intn(400)))
+		}
+	}()
+
+	addr := ":9999"
+	log.Printf("Serving at %s", addr)
+	http.Handle("/metrics", exporter)
+	log.Fatal(http.ListenAndServe(addr, nil))
+}

example_test.go

@@ -0,0 +1,33 @@
+// Copyright 2018, OpenCensus 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 prometheus_test
+
+import (
+	"log"
+	"net/http"
+
+	"contrib.go.opencensus.io/exporter/prometheus"
+)
+
+func Example() {
+	exporter, err := prometheus.NewExporter(prometheus.Options{})
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	// Serve the scrape endpoint on port 9999.
+	http.Handle("/metrics", exporter)
+	log.Fatal(http.ListenAndServe(":9999", nil))
+}

go.mod

@@ -0,0 +1,9 @@
+module contrib.go.opencensus.io/exporter/prometheus
+
+require (
+	github.com/golang/mock v1.2.0 // indirect
+	github.com/prometheus/client_golang v0.9.3-0.20190127221311-3c4408c8b829
+	go.opencensus.io v0.21.0-alpha // TODO [rghetia] remove after v0.21.0 is released.
+	gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 // indirect
+	gopkg.in/yaml.v2 v2.2.2 // indirect
+)

go.sum

@@ -0,0 +1,131 @@
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+github.com/Shopify/toxiproxy v2.1.4+incompatible/go.mod h1:OXgGpZ6Cli1/URJOF1DMxUHB2q5Ap20/P/eIdh4G0pI=
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