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GolangでDockerベースのCIを作る
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Shunsuke Maeda
May 18, 2019
Technology
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3.5k
GolangでDockerベースのCIを作る
Golang を使って Dockerベース のCIを作るお話です。
Shunsuke Maeda
May 18, 2019
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Transcript
Golang Ͱ Docker ϕʔεͷ CI Λ࡞Δ ɹ GoConference 2019 Spring
2019.05.18 [SAT] Shunsuke Maeda (@duck8823)
ࣗݾհ ✓ Shunsuke Maeda ✓ @duck8823 ✓ ॴଐ ✓גࣜձࣾΤεɾΤϜɾΤε ✓EarthCampusגࣜձࣾʢ෭ʣ
2/43
CI͠ΜͲ͍ 3/43
CI͠ΜͲ͍ ! ✓CIΛߏங͍ͨ͠ ci := ci.New() for ci.IsBroken { //
CI͕յΕͯͨΒ fix(ci) // ϩʔΧϧͰ͚͢Ͳಈ࡞֬ೝͰ͖ͳ͍ͷͰ git.Commit() // ίϛοτ ͯ͠ git.Push() // ϓογϡ ͯ͠ ci.Run() // CI ಈ͔ͯ͠ΈΔ } 4/43
Golang Ͱ Docker ϕʔεͷ CI Λ࡞Δ duck8823/duci 5/43
duci ͷಛ ✓DockerfileͰఆٛ ✓ ֶशίετ͕͍ ✓ ϩʔΧϧͰ࣮ߦ ✓GitHub ʹରԠ ✓
Push / PR্ͷίϝϯτ Ͱ࣮ߦ ✓ ίϛοτεςʔλεΛ࡞ 6/43
ֶशίετ ✓Dockerfile ͷΈ FROM golang:1.12.4-alpine # ϕʔεΠϝʔδ RUN apk --update
add --no-cache ... # ඞཁͳύοέʔδͷΠϯετʔϧ WORKDIR /workdir COPY . . ENTRYPOINT ["make"] # λεΫϥϯφʔͷར༻Λਪ CMD ["test"] # σϑΥϧτͷλεΫ 7/43
ֶशίετ ✓DockerͷࣝͰΩϟογϡԽ FROM golang:1.12.4-alpine RUN apk --update add --no-cache ...
WORKDIR /workdir COPY go.mod . COPY go.sum . RUN go mod download COPY . . ENTRYPOINT ["make"] CMD ["test"] 8/43
ϩʔΧϧͰ࠶ݱ ✓ίϚϯυΛ༻ҙ ✓ϩʔΧϧͰࢼ͔ͯ͠Β commit & push Ͱ͖Δ duci run INFO[14/May/2019
09:25:57.353] Step 1/9 : FROM openjdk:11 as Build INFO[14/May/2019 09:25:57.353] INFO[14/May/2019 09:25:57.353] ---> 0aa10063a184 INFO[14/May/2019 09:25:57.353] Step 2/9 : WORKDIR /workdir INFO[14/May/2019 09:25:57.353] INFO[14/May/2019 09:25:57.353] ---> Using cache INFO[14/May/2019 09:25:57.353] ---> 2dcc968d8994 ... 9/43
CIΛ࡞Δ 10/43
Continuous Integration 11/43
Continuous Integration ✓ఆظతʹ ✓ϏϧυςετΛ࣮ߦ ͢Δ͜ͱͰ ✓ૣظʹ ϑΟʔυόοΫ Λಘͯ όά͕ຊ൪ڥʹࠞೖ͢ΔͷΛ͙ 12/43
CIͰߟ͑Δඞཁ͕͋Δ͜ͱ ✓ఆظతʹ ✓ ࣮ߦλΠϛϯά ✓ϏϧυςετΛ࣮ߦ ✓ ࣮ߦڥ ✓ϑΟʔυόοΫ ✓ ࣮ߦ݁Ռ
13/43
duci ʹ͓͚Δߏ ✓࣮ߦλΠϛϯά ✓ GitHub Webhooks ✓࣮ߦڥ ✓ Dockerίϯςφ ✓࣮ߦ݁Ռ
✓ ϩάग़ྗ / GitHub ίϛοτεςʔλε 14/43
CIͰߟ͑Δඞཁ͕͋Δ͜ͱ ✓ఆظతʹ ✓ ࣮ߦλΠϛϯά ✓ϏϧυςετΛ࣮ߦ ✓ ࣮ߦڥ ✓ϑΟʔυόοΫ ✓ ࣮ߦ݁Ռ
15/43
࣮ߦλΠϛϯά ✓GitHub Webhooks https://github.com/<owner>/<repo>/settings/hooks ✓ ҙͷλΠϛϯάͰ Payload Λඈ͢ 16/43
PayloadΛड͚औΔ ✓GitHub ͔ΒඈΜͰ͘Δ Payload JSON Λड͚औΔඞཁ͕͋Δ import "net/http" func JobHandler(w
http.ResponseWriter, r *http.Request) { // ֤ΠϕϯτʹରԠͨ͠PayloadͷύʔεॲཧͱCIδϣϒͷ࣮ߦ } func main() { http.HandleFunc("/", JobHandler) http.ListenAndServe(":8080", nil) } 17/43
GitHub ͷ Webhooks ✓Event ͱ Action ͷΈ߹ΘͤͰλΠϛϯά੍ޚ ✓Event ✓ Webhooksͷछྨ
(Header: X-GitHub-Event) ྫ. push, issue_comment, pull_request ✓ GitHubͰઃఆՄೳ ✓Action ✓ Eventຖͷࡉ͔͍छྨ (JSON payload) ྫ. created, opened, synchronize 18/43
Eventͷऔಘ ✓ϦΫΤετͷϔομʔ X-GitHub-Event ͔ΒΠϕϯτΛऔಘ ✓Πϕϯτຖʹ Payload ͕ҟͳΔ func JobHandler(w http.ResponseWriter,
r *http.Request) { event := r.Header.Get("X-GitHub-Event") switch event { case "push": // https://developer.github.com/v3/activity/events/types/#pushevent case "issue_comment": // https://developer.github.com/v3/activity/events/types/#issuecommentevent case "pull_request": // https://developer.github.com/v3/activity/events/types/#pullrequestevent default: http.Error(w, fmt.Sprintf("Bad event type: %s", event), http.StatusBadRequest) } } 19/43
Payload JSON ͷऔΓѻ͍ ✓encoding/json ͰσίʔυͰ͖Δ ✓Payloadͷܕ github.com/google/go-github import ( "encoding/json"
"github.com/google/go-github/github" ) func JobHandler(w http.ResponseWriter, r *http.Request) { switch r.Header.Get("X-GitHub-Event") { case "push": event := &github.PushEvent{} err := json.NewDecoder(r.Body).Decode(event) ... } } 20/43
Forkͨ͠ϦϙδτϦ͔Βͷ Pull Request ✓push ΠϕϯτඈΜͰ͜ͳ͍ ✓ pull_request Πϕϯτͷ synchronize ΞΫγϣϯ
func JobHandler(w http.ResponseWriter, r *http.Request) { switch r.Header.Get("X-GitHub-Event") { case "pull_request": event := &github.PullRequestEvent{} json.NewDecoder(r.Body).Decode(event) switch event.GetAction() { case "synchronize", "open": ... } } } 21/43
Pull Request ͷίϝϯτ import ( "github.com/google/go-github/github" "golang.org/x/oauth2" ) func JobHandler(w
http.ResponseWriter, r *http.Request) { switch r.Header.Get("X-GitHub-Event") { case "issue_comment": event := &github.IssueComment{} json.NewDecoder(r.Body).Decode(event) ts := oauth2.StaticTokenSource(&oauth2.Token{AccessToken: "access token"}) tc := oauth2.NewClient(context.Background(), ts) cli := github.NewClient(tc) pr := cli.PullRequests.Get( context.Background(), ownerName, repoName, event.GetIssue().GetNumber(), ) ... } } 22/43
ඇಉظͰϨεϙϯεΛฦ͢ ✓δϣϒ͕͔͔࣌ؒΔ => ඇಉظʹ࣮ߦͯ͠ϨεϙϯεΛฦ͢ func JobHandler(w http.ResponseWriter, r *http.Request) {
if (invalidRequest(r)) { http.Error(w, r.Error(), http.StatusBadRequest) return } go func() { // CIδϣϒͷ࣮ߦ }() w.WriteHeader(http.StatusOK) } 23/43
࣮ߦλΠϛϯά (·ͱΊ) ✓ϦΫΤετड => net/http ✓Payload ͷܕ => ϥΠϒϥϦͷར༻ ྫ.
GitHub Webhooks: github.com/google/go-github ✓ GitHub Event ͱ Action ͰλΠϛϯάΛ੍ޚ ✓ඇಉظͰϨεϙϯεΛฦ͢ => goroutine 24/43
CIͰߟ͑Δඞཁ͕͋Δ͜ͱ ✓ఆظతʹ ✓ ࣮ߦλΠϛϯά ✓ϏϧυςετΛ࣮ߦ ✓ ࣮ߦڥ ✓ϑΟʔυόοΫ ✓ ࣮ߦ݁Ռ
25/43
࣮ߦڥ ✓Dockerίϯςφ ✓ ϗετΛԚ͞ͳ͍ ✓ ϩʔΧϧ / CI Ͱͷಈ࡞ʹ࠶ݱੑΛͱΓ͍͢ ✓github.com/docker/docker
Λར༻ 26/43
github.com/docker/docker ✓ϦϙδτϦ moby/moby ✓Docker Daemon ͷରԠAPIόʔδϣϯ ɹ- Docker for Mac
1.39 ✓ Moby ͷ master 1.41 docker version Server: Docker Engine - Community Engine: Version: 18.09.2 API version: 1.39 (minimum version 1.12) ... 27/43
DockerΠϝʔδ/ίϯςφΛѻ͏ import "github.com/docker/docker/client" cli, _ := client.NewClientWithOpts(client.FromEnv) ✓ײతͳAPI ✓ cli#ImageBuild
= docker build ✓ cli#ContainerCreate = docker create ✓ cli#ContainerStart = docker start 28/43
DockerΠϝʔδͷϏϧυ ✓ίϯςΩετʢσΟϨΫτϦʣΛ tarball ͷܗࣜʹ͢Δඞཁ͕͋Δ ✓cli#ImageBuild ✓ ඇಉظʹ࣮ߦ͞ΕΔ ✓ resp.Body Λ
EOF ·ͰಡΜͰऴྃͪ opts := types.ImageBuildOptions{ Tags: []string{"tag"} } resp, _ := cli.ImageBuild(ctx, tarball("/workdir"), opts) ioutil.ReadAll(resp.Body) 29/43
ίϯςφͷ࣮ߦ ✓ίϯςφͷ࡞ cli#ContainerCreate ✓cli#ContainerStart ඇಉظ ✓ cli#ContainerWait cli#ContainerLogs ͰδϣϒͷใΛऔಘ
sopts := types.ContainerStartOptions{} cli.ContainerStart(context.Background(), "containerId", sopts) code, _ := cli.ContainerWait(context.Background(), "containerId") if code != 0 { // exit code ͕ 0Ҏ֎ => δϣϒͷࣦഊ } lopts := types.ContainerLogsOptions{ ShowStdout: true, ShowStderr: true } log _ := cli.ContainerLogs(context.Background(), "containerId", lopts) 30/43
δϣϒͷฒྻͱλΠϜΞτ ✓ϦΫΤετຖʹ goroutine Ͱ࣮ߦ ✓ δϣϒΛ͍࣮ͭ͘ߦͯ͠͠·͏ ✓ϗετͷϦιʔε༗ݶ => ฒྻͷ੍ޚ ✓
͕͔͔࣌ؒΔॲཧ͕͋Δͱ࣍ͷδϣϒ͕࣮ߦ͞Εͳ͍ => λΠϜΞτͷઃఆ 31/43
ฒྻͷ੍ޚ ✓channel Λར༻ var sem = make(chan struct{}, 2) //
2ͭΛ༻ҙ func execute() { sem <- struct{}{} // ΛҰͭ֬อ͢Δ(ۭ͖͕ͳ͚Ε͜͜ͰॲཧΛͭ worker.execute() // CIδϣϒͷ࣮ߦ <-sem // ΛҰͭղ์͢Δ } func main() { go execute() go execute() go execute() } 32/43
λΠϜΞτͷઃఆ ✓context#WithTimeout ͰλΠϜΞτΛઃఆͰ͖Δ func execute() { err := make(chan error)
timeout, cancel := context.WithTimeout(context.Background(), 10 * time.Second) defer cancel() go func() { err <- worker.execute() // CIδϣϒͷ࣮ߦ }() select { case <-timeout.Done(): println("timeout") case e := <-err: println("done") } } 33/43
࣮ߦڥ (·ͱΊ) ✓DockerΫϥΠΞϯτ ✓ github.com/docker/docker ✓ ײతͳAPI ✓ ಉظॲཧ image
build ͱ container start ͰҟͳΔ ✓ฒྻͷ੍ޚ ✓ channel ✓λΠϜΞτͷઃఆ ✓ context#WithTimeout 34/43
CIͰߟ͑Δඞཁ͕͋Δ͜ͱ ✓ఆظతʹ ✓ ࣮ߦλΠϛϯά ✓ϏϧυςετΛ࣮ߦ ✓ ࣮ߦڥ ✓ϑΟʔυόοΫ ✓ ࣮ߦ݁Ռ
35/43
࣮ߦ݁Ռ ✓GitHub ͷίϛοτεςʔλε 36/43
ίϛοτεςʔλε ts := oauth2.StaticTokenSource(&oauth2.Token{AccessToken: "ΞΫηετʔΫϯ"}) tc := oauth2.NewClient(context.Background(), ts) cli
:= github.NewClient(tc) stat := &github.Status{ Context: github.String("ίϛοτεςʔλεͷ໊લ"), Description: github.String("ৄࡉઆ໌ͳͲ(จࣈ੍ݶ͋Γ)"), State: github.String("εςʔλεʢྫ. failureʣ"), TargetURL: github.String("֎෦ϖʔδͷϦϯΫ"), } cli.Repositories.CreateStatus( context.Background(), "ownerName", "repoName", "ref (commit hash)", stat, ) 37/43
ϩά / Ϩεϙϯεͷදࣔ ✓http.ResponseWriter#Write ͰϨεϙϯεʹॻ͖ࠐΈ func LogHandler(w http.ResponseWriter, r *http.Request)
{ w.WriteHeader(http.StatusOK) w.Write([]byte("log")) } 38/43
࣮ߦڥͱ࣮ߦ݁ՌΛૄʹ͢Δ ✓ૄͳઃܭʹ͓ͯ͘͠ͱࠩͰػೳΛ࣮͍͢͠ ✓݁ՌΛग़ྗ͍ͨ͠λΠϛϯάδϣϒ࣮ߦத(લޙ)ʹ ✓ δϣϒͷొ࣌ ✓ δϣϒͷ࣮ߦ։࢝࣌ ✓ ϩά ✓
δϣϒͷऴྃ࣌ʢޭ/ࣦഊ/Τϥʔ) 39/43
࣮ߦڥͱ࣮ߦ݁ՌΛૄʹ͢Δ ✓࣮ߦڥͰϑΟʔυόοΫ༻ؔΛઃఆͰ͖ΔΑ͏ʹ͢Δ type worker struct { startFun func() } func
(w *worker) run() { err := w.startFun() ... } func localRun() { w := &worker{ startFun: printLog } w.run() } func serverRun() { w := &worker{ startFun: printLogAndCommitStatus } w.run() } 40/43
࣮ߦ݁Ռ (·ͱΊ) ✓GitHubͷίϛοτεςʔλε ✓ github.com/google/go-github ✓Ϩεϙϯε ✓ net/http ͷ http.ResponseWriter#Write
✓࣮ߦڥͱ࣮ߦ݁ՌΛૄʹ͢Δ ✓ ϑΟʔυόοΫ༻ؔΛઃఆͰ͖ΔΑ͏ʹ͢Δ 41/43
·ͱΊ ✓ඪ४ػೳ/ඪ४ϥΠϒϥϦ ✓ ඇಉظλΠϜΞτ ✓ HTTPαʔόʔ ✓GitHub Docker ͳͲͷΫϥΠΞϯτϥΠϒϥϦΛར༻
✓ҰͭҰͭͷʢهड़ʣ؆ܿ ✓ Έ߹ΘͤͯCIΛ࡞Δ͜ͱ͕Ͱ͖Δ 42/43
Let's make CI server! 43/43