Automate getting the list of examples to build (and switch to go 1.13…

… to avoid module problems) (#246)

* automate building all the examples

the EXAMPLES variable was out of date - the stackdriver example wasn't
even built

let's automate it, so we don't need to remember about updating the
variable after adding a new example to the examples directory

* move jaeger example to example directory

this should be in the examples directory, so it can be built by the
make test during CI.

* switch to go 1.13

circle ci uses go 1.12 (which is the oldest 1.12 release) that
contains some bugs with module handling

let's switch to go 1.13.3, the latest go currently

* use a single valid revision of the project in go.mod files

this probably shouldn't be a problem since the switch to go 1.13 in
circle ci, but cleans up the mess and the use of bogus releases

.circleci/config.yml

@@ -2,7 +2,7 @@ version: 2
 jobs:
   build:
     docker:
-      - image: circleci/golang:1.12 #
+      - image: circleci/golang:1.13.3
 
     environment:
       TEST_RESULTS: /tmp/test-results # path to where test results will be saved

.gitignore

@@ -7,4 +7,7 @@ coverage.*
 /example/basic/basic
 /example/http/client/client
 /example/http/server/server
+/example/http-stackdriver/client/client
+/example/http-stackdriver/server/server
+/example/jaeger/jaeger
 /example/namedtracer/namedtracer

Makefile

@@ -2,10 +2,7 @@ ALL_PKGS := $(shell GO111MODULE=on go list ./...)
 
 export GO111MODULE=on
 
-EXAMPLES := \
-	./example/basic \
-	./example/http/client \
-	./example/http/server
+EXAMPLES := $(shell ./get_main_pkgs.sh ./example)
 
 # All source code and documents. Used in spell check.
 ALL_DOCS := $(shell find . -name '*.md' -type f | sort)

example/README.md

@@ -21,7 +21,7 @@ Example uses
 
 #### Prequisites
 
-- go 1.12 installed
+- go 1.13 installed
 - GOPATH is configured.
 
 #### 1 Download git repo

example/basic/go.mod

@@ -1,7 +1,7 @@
 module github.com/open-telemetry/opentelemetry-go/example/basic
 
-go 1.12
+go 1.13
 
 replace go.opentelemetry.io => ../..
 
-require go.opentelemetry.io v0.0.0-00010101000000-000000000000
+require go.opentelemetry.io v0.0.0-20191025183852-68310ab97435

example/http-stackdriver/go.mod

@@ -8,7 +8,7 @@ replace (
 )
 
 require (
-	go.opentelemetry.io v0.0.0
-	go.opentelemetry.io/exporter/trace/stackdriver v0.0.0-00010101000000-000000000000
+	go.opentelemetry.io v0.0.0-20191025183852-68310ab97435
+	go.opentelemetry.io/exporter/trace/stackdriver v0.0.0-20191025183852-68310ab97435
 	google.golang.org/grpc v1.24.0
 )

example/http/go.mod

@@ -1,10 +1,10 @@
 module github.com/open-telemetry/opentelemetry-go/example/http
 
-go 1.12
+go 1.13
 
 replace go.opentelemetry.io => ../..
 
 require (
-	go.opentelemetry.io v0.0.0-00010101000000-000000000000
+	go.opentelemetry.io v0.0.0-20191025183852-68310ab97435
 	google.golang.org/grpc v1.24.0
 )

example/jaeger/go.mod

@@ -0,0 +1,13 @@
+module go.opentelemetry.io/example/jaeger
+
+go 1.13
+
+replace (
+	go.opentelemetry.io => ../..
+	go.opentelemetry.io/exporter/trace/jaeger => ../../exporter/trace/jaeger
+)
+
+require (
+	go.opentelemetry.io v0.0.0-20191025183852-68310ab97435
+	go.opentelemetry.io/exporter/trace/jaeger v0.0.0-20191025183852-68310ab97435
+)

example/namedtracer/go.mod

@@ -1,7 +1,7 @@
 module go.opentelemetry.io/example/namedtracer
 
-go 1.12
+go 1.13
 
 replace go.opentelemetry.io => ../..
 
-require go.opentelemetry.io v0.0.0-00010101000000-000000000000
+require go.opentelemetry.io v0.0.0-20191025183852-68310ab97435

exporter/trace/stackdriver/go.mod

@@ -1,13 +1,13 @@
 module go.opentelemetry.io/exporter/trace/stackdriver
 
-go 1.12
+go 1.13
 
 replace go.opentelemetry.io => ../../..
 
 require (
 	cloud.google.com/go v0.47.0
 	github.com/golang/protobuf v1.3.2
-	go.opentelemetry.io v0.0.0-20191021171549-9b5f5dd13acd
+	go.opentelemetry.io v0.0.0-20191025183852-68310ab97435
 	golang.org/x/oauth2 v0.0.0-20190604053449-0f29369cfe45
 	google.golang.org/api v0.11.0
 	google.golang.org/genproto v0.0.0-20191009194640-548a555dbc03

get_main_pkgs.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+
+set -euo pipefail
+
+top_dir='.'
+if [[ $# -gt 0 ]]; then
+    top_dir="${1}"
+fi
+
+p=$(pwd)
+mod_dirs=()
+mapfile -t mod_dirs < <(find "${top_dir}" -type f -name 'go.mod' -exec dirname {} \; | sort)
+
+for mod_dir in "${mod_dirs[@]}"; do
+    cd "${mod_dir}"
+    main_dirs=()
+    mapfile -t main_dirs < <(go list --find -f '{{.Name}}|{{.Dir}}' ./... | grep '^main|' | cut -f 2- -d '|')
+    for main_dir in "${main_dirs[@]}"; do
+        echo ".${main_dir#${p}}"
+    done
+    cd "${p}"
+done