AWS Lambda + Go

AWS LambdaでGoを使うに当たっての基本的なことの紹介

Transcript

1. AWS Lambda + Go 2017/06/16 γφδʔϚʔέςΟϯά(ג) Տ໺݈ଠ࿕
2. ࣗݾ঺հ • Տ໺ ݈ଠ࿕ • γφδʔϚʔέςΟϯά(ג) ϓϩμΫτ։ൃ෦ ॴଐ • Synergy! ͷϚϧννϟωϧରԠ͕ओۀ຿ • ΞϓϦϓογϡج൫ߏங • GoͰߏங → ܰྔԽ͍ͨ͠ • LINE ϝοηʔδϯάج൫ߏங • callback෦෼ΛGoͰ
3. AWS Lambda ͓͞Β͍
4. AWS Lambda ͱ͸ • Function as a Service • AWSͷαʔϏε্ͷΠϕϯτʹରԠ • ྫ) S3ʹը૾͕Ξοϓϩʔυ͞Εͨͱ͖ɺϦαΠ ζ͢Δ • Node.jsɺJavaɺC#ɺPython͕αϙʔτ͞Ε͍ͯΔ • Lambda Function ͱ͍͏୯ҐͰ؅ཧ
5. Lambda FunctionͷྫʢNode.jsʣ exports.handler = (event, context, callback) => { // Do Something callback(null, 'Hello from Lambda'); }; // event: Πϕϯτ৘ใ
 // context: ϥϯλΠϜ৘ใ
 // callback: ݺͼग़͠ݩʹ৘ใΛฦͨ͢Ίͷؔ਺
6. αϙʔτ͞Ε͍ͯͳ͍ͷʹ
 ͳΜͰGoͰ΍Δͷʁ
7. ͳΜͰGo? • ඪ४ͷݴޠͱൺֱͯ͠ɺḮ৭ͳ͍ύϑΥʔϚϯε • ࣾ಺ͷϥΠϒϥϦ͕࢖༻Ͱ͖Δ • ׳Ε • ίετ
8. GoͰͰ͖Δ͜ͱ͸GoͰ΍Γ͍ͨʂʂʂ
9. Ͳ͏΍ͬͯGoΛ࢖͏͔
10. ApexΛ࢖༻͢Δ
11. Apex ͱ͸ • Lambda FunctionΛ؅ཧ͢Δπʔϧ • ެࣜҎ֎ͷݴޠ΋αϙʔτ • Functionͷ࣮૷ʹ࢖͑ΔϥΠϒϥϦ΋ఏڙ • ࣮૷ɺϏϧυɺσϓϩΠΛҰ؏ͯ͠ߦ͑Δ • Node.jsͷhandler + GoͷόΠφϦΛಉࠝͯ͠σϓϩ Π
12. AWS Lambda ࣮ߦͷ࢓૊ΈʢApex+Goʣ 1. Πϕϯτൃੜ 2. Lambda FunctionΛίϯςφ্Ͱىಈ 3. نఆͷhandlerΛݺͼग़͢(Node.js) 4. Node.js͔ΒspawnͰmainΛ࣮ߦ • apexͷhandlerΛ࣮ߦ
13. Apex جຊίϚϯυ # ϓϩδΣΫτॳظԽ(IAM role, policyͷ࡞੒) $ apex init # ϏϧυͷΈ $ apex build > hello.zip # ϏϧυɺσϓϩΠΛ࣮ߦ $ apex deploy # functionͷϦετʢAWS্ͷ৘ใ΋֬ೝͰ͖Δʣ $ apex list
14. Apex ϑΝΠϧߏ੒ . ├ ─ ─ functions │ ├ ─ ─ bot # σΟϨΫτϦ୯ҐͰ؅ཧ │ ├ ─ ─ function.json # function͝ͱͷઃఆ │ └ ─ ─ main.go ├ ─ ─ .apexignore # ແࢹ͢ΔϑΝΠϧͷઃఆ └ ─ ─ project.json # ϓϩδΣΫτશମͷઃఆ
15. project.json { "name": "line-kensho", "description": "lineͷݕূ༻", "memory": 128, "timeout": 5, "role": "arn:aws:iam::...", "environment": {}, "runtime": "golang" }
16. function.json { "environment": { "CHANNEL_SECRET": ”...", "CHANNEL_TOKEN": ”..." } } function.jsonͷํ͕༏ઌ͞ΕΔ
17. .apexignore • gitignoreͱಉ͡ॻࣜ • Ϗϧυͷࡍʹzipͷର৅ʹ͠ͳ͍ • *.go ͰιʔείʔυΛআ֎
18. Lambda Function ͷྫʢApex+Goʣ import "github.com/apex/go-apex" func main() { apex.HandleFunc( func(e json.RawMessage, c *apex.Context) (interface{}, error) { return "Hello from Lambda", nil }) } // json.RawMessage: Πϕϯτ৘ใ // apex.Context: ϥϯλΠϜ৘ใ // return஋: ݺͼग़͠ݩʹฦ͢৘ใ
19. ஫ҙ఺
20. ஫ҙ఺ • ඪ४ग़ྗͷ಺༰͸Functionͷ݁Ռͱͯ͠ѻ͏ • ϩά͸ඪ४Τϥʔग़ྗʹ • ࢒ΓͷՔಇՄೳ͕࣌ؒऔಘͰ͖ͳ͍ • environment ͸ϚωδϝϯτίϯιʔϧͰؙݟ͑ • ೝূ৘ใ͸͖ͪΜͱ؅ཧ͠ͳ͍ͱ…ʢݕ౼தʣ
21. AWS API Gatewayͱͷ࿈ܞ
22. API Gatewayͱͷ࿈ܞ • API GatewayͰAPIΛ࡞੒ • ϦιʔεɺϝιουΛఆٛ • integrationʹLambda FunctionΛࢦఆ • ProxyϦιʔεͱͯ͠࿈ܞ͢Δ • ϦΫΤετͷ৘ใ͕JSONͰ౉ͬͯ͘Δ
23. API Gatewayͱ࿈ܞޙͷ࣮૷ type Request struct { Body string `json:"body"` Headers map[string]string `json:"headers"` HTTPMethod string `json:"httpMethod"` Path string `json:"path"` PathParameters map[string]string `json:"pathParameters"` QueryStringParameters map[string]string `json:"queryStringParameters”` // ...ଞ͍Ζ͍Ζ... } func main() { apex.HandleFunc( func(e json.RawMessage, c *apex.Context) (interface{}, error) { // ͜͜ͰϦΫΤετͷ৘ใΛ json.UnmarshalͳͲ͢Δඞཁ͕͋Δ => πϥΠ }) }
24. github.com/fujiwara/ridge
25. ridge ͱ͸ • ApexΛϥοϓ • net/http.Request, net/http.ResponsWriter͕࢖͑ Δ • logύοέʔδ͕࢖͑Δ
26. ridgeͰͷ࣮૷ import "github.com/fujiwara/ridge" func main() { var mux = http.NewServeMux() mux.HandleFunc("/", handleRoot) ridge.Run(":8080", "/api", mux) } func handleHello(w http.ResponseWriter, r *http.Request) { w.Header().Set("Content-Type", "text/plain") fmt.Fprintf(w, "Hello %s\n", r.FormValue("name")) } // ͍ͭ΋Ͳ͓Γͷ࣮૷ͰΒͪ͘Μ
27. ridgeͰͷ஫ҙ఺ • ridge.Run ͷprefix͸AWS্Ͱ͸ແޮ • handlerΛ౉͢ͱ͖ʹStrip͢Δ // ridge.Run(":8080", ”/callback", handler) stripped := http.StripPrefix("/callback", handler) ridge.Run(":8080", "", stripped)
28. ·ͱΊ
29. ·ͱΊ • AWS LambdaͰ΋Go͸࢖͑Δ • ApexΛ࢖͏ • API Gatewayͱ࿈ܞ͢ΔͳΒridgeΛ࢖͏