DESAMIS Go Training Season 1 Day 5

(Pݚमୈظ %": :VUBLB,BUP   3% %&4".*4 %&4".*4ࣾ಺ݚम

˞ લճͷ13ͷ   ղઆλΠϜ

ݚमܭը ճ ೔࣍ ༧ఆ λΠτϧ ୈճ Ր (Pͷجຊ
ୈճ Ր ؀ڥߏஙͱ(JU (JU)VCͷجຊ ୈճ Ր جຊߏจ ୈճ Ր ߏ଄ମɺεϥΠεɺϚοϓ ୈճ Ր ඪ४ϥΠϒϥϦ͸΍Ί͙Γ ୈճ Ր ϞδϡʔϧγεςϜͱ֎෦ϥΠϒϥϦ ୈճ Ր )FSPLV(Pೖ໳ ୈճ Ր "84-BNCEB(Pೖ໳ ୈճ Ր ฒߦॲཧϓϩάϥϛϯά ୈճ Ր ୯ମςετٕ๏ ୈճ Ր σʔλϕʔεΞΫηε ୈճ Ր 'ZOFʹΑΔ(6*ΞϓϦέʔγϣϯ։ൃ ୈճ Ր ࣾ಺(PϓϩδΣΫτͷίʔυղઆ

ຊ೔ͷΰʔϧ w 🚩ΰʔϧ w (Pͷ๛෋ͳඪ४ϥΠϒϥϦΛ၆ᛌ͢Δ w Α͘࢖͏ϥΠϒϥϦΛ࣮ࡍʹ࢖ͬͯΈΔ w ❌ΰʔϧͰ͸ͳ͍ w
શͯͷඪ४ϥΠϒϥϦΛ࢖͑ΔΑ͏ʹͳΔ

ඪ४ϥΠϒϥϦͷ   า͖ํ

τοϓϨϕϧͷҰཡ BSDIJWF DSZQUP fl BH JP QMVHJO TZOD CV
fi P EBUBCBTF GNU MPH SF fl FDU TZTDBMM CVJMUJO EFCVH HP NBUI SFHFYQ UFTUJOH CZUFT FNCFE IBTI NJNF SVOUJNF UFYU DPNQSFTT FODPEJOH IUNM OFU TPSU UJNF DPOUBJOFS FSSPST JNBHF PT TUSDPOW VOJDPEF DPOUFYU FYQWBS JOEFY QBUI TUSJOHT VOTBGF (PͰ௥Ճ (PͰ௥Ճ (PͰ௥Ճ

ࣾ಺ίʔυͷར༻࣮੷ BSDIJWF DSZQUP fl BH JP QMVHJO TZOD CV
fi P EBUBCBTF GNU MPH SF fl FDU TZTDBMM CVJMUJO EFCVH HP NBUI SFHFYQ UFTUJOH CZUFT FNCFE IBTI NJNF SVOUJNF UFYU DPNQSFTT FODPEJOH IUNM OFU TPSU UJNF DPOUBJOFS FSSPST JNBHF PT TUSDPOW VOJDPEF DPOUFYU FYQWBS JOEFY QBUI TUSJOHT VOTBGF (JU)VCͷίʔυݕࡧͰௐ΂·ͨ͠

ଟ਺ͷαϒσΟϨΫτϦ w BSDIJWFUBSBSDIJWF[JQ w DPNQSFTTC[JQDPNQSFTT fl BUFDPNQSFTTH[JQ DPNQSFTTM[XDPNQSFTT[MJC w DPOUBJOFSIFBQDPOUBJOFSMJTUDPOUBJOFSSJOH
w DSZQUPBFTDSZQUPDJQIFSDSZQUPEFTDSZQUPETBDSZQUP FDETBDSZQUPFEDSZQUPFMJQUJD   ʜ εϥογϡͰ۠੾ΒΕͨΑΓࡉ͔͍෼ྨ͕͋Δ΋ͷ͕ଟ͍

า͖ํ w QLHHPEFW΢ΣϒαΠτ w ϒϥ΢βͰશମΛ၆ᛌ͠ͳ͕Β୳͍ͨ͠ͱ͖ w HPEPDίϚϯυ w ࢖͏ύοέʔδ͸ܾ·͍ͬͯΔͱ͖ w
(JU)VCͷίʔυ w ୯ʹϥΠϒϥϦΛ࢖͏Ҏ্ͷ৘ใΛಘ͍ͨͱ͖

QLHHPEFW΢ΣϒαΠτ 👉IUUQTQLHHPEFWTUE

HPEPDίϚϯυ FODPEJOHDTWΛௐ΂͍ͨͳˠgo doc csv ·ͣ͸/FX8SJUFSؔ਺͔ͳʜˠgo doc csv.NewWriter
ͭ͗ʹ8SJUFSߏ଄ମΛৄ͘͠ʜˠgo doc csv.Writer 'MVTIϝιουͷ࢓༷͸ʜˠgo doc csv.Writer.Flush go doc <pkg > go doc <sym>[.<methodOrField> ] go doc [<pkg>.]<sym>[.<methodOrField> ] go doc [<pkg>.][<sym>.]<methodOrField>

(JU)VCͷίʔυ w (Pͷίʔυ͸(JU)VCͰ ΋ ެ։͞Ε͍ͯΔ   IUUQTHJUIVCDPNHPMBOHHP w ඪ४ϥΠϒϥϦ͕͋Δͷ͸TSDҎԼ  
IUUQTHJUIVCDPNHPMBOHHPUSFFNBTUFS TSD w ඪ४ϥΠϒϥϦͷઃܭ΍࣮૷͸ྑ͍͓खຊɺؔ਺ͷ ໋໊ύλʔϯ͔ΒυΩϡϝϯτͷॻ͖ํ·Ͱɺਅࣅ Ͱ͖ΔϙΠϯτ͸ͨ͘͞Μ͋Δ

ඪ४ϥΠϒϥϦ   ࣮ફϋϯζΦϯ

45&1 fl BH package mai n import ( "flag "
"fmt " ) func main() { areaCode := flag.String("c", "130000", "ΤϦΞίʔυ" ) flag.Parse( ) fmt.Printf("ΤϦΞίʔυ͸ %s Ͱ͢\n", *areaCode ) } fl BHίϚϯυϥΠϯҾ਺Λศརʹѻ͏ϥΠϒϥϦ 👇ࣸܦͯ͠ΈΑ͏ EBZIBOETPONBJOHP ʮgo run .ʯʮgo run . -c 016000ʯʮgo run . -hʯͷ࣮ߦ݁Ռ͸ʁ

45&1OFUIUUQ resp, err := http.Get("https://www.jma.go.jp" + "/bosai/forecast/data/overview_forecast/" + *areaCode +
".json" ) if err != nil { fmt.Println(err ) os.Exit(1 ) } defer resp.Body.Close( ) fmt.Printf("εςʔλείʔυ͸ %d Ͱ͢\n", resp.StatusCode) OFUIUUQଟ࠼ͳ)551௨৴͕ՄೳͳϥΠϒϥϦ   ·ͣ͸࠷΋؆୯ʹ࢖͑Δ(FU Λ࢖ͬͯΈΔ 👇NBJOؔ਺ͷ຤ඌʹॻ͖଍ͯ͠ΈΑ͏ ʮgo run .ʯ͸ɺʮgo run . -c 123ʯ͸ʹͳΕ͹0,

45&1JP body, err := io.ReadAll(resp.Body ) if err
!= nil { fmt.Println(err ) os.Exit(1 ) } fmt.Println(string(body)) JPศརͳ൚༻ೖग़ྗॲཧϥΠϒϥϦ 👇NBJOؔ਺ͷ຤ඌʹॻ͖଍ͯ͠ΈΑ͏ ʮgo run .ʯͷ࣮ߦ݁Ռ͸ʁ

45&1MPH if err != nil { log.Fatalf("઀ଓͰ͖·ͤΜͰͨ͠: %v", err )
} MPHγϯϓϧͳϩάग़ྗϥΠϒϥϦ if err != nil { fmt.Println(err ) os.Exit(1 ) } 👇ҎԼͷΑ͏ʹॻ͍͍ͯͨͱ͜ΖΛʜ 👇ҎԼͷΑ͏ʹॻ͖׵͑ͯΈ·͠ΐ͏ if err != nil { log.Fatalf("Ϩεϙϯεͷड৴ʹࣦഊ͠·ͨ͠: %v", err ) }

45&1FODPEJOHKTPO if resp.StatusCode != http.StatusOK { log.Fatalf("HTTP %s: %v",
resp.Status, string(body) ) } forecast := struct { HeadlineText string `json:"headlineText" ` Text string `json:"text" ` }{ } if err := json.Unmarshal(body, &forecast); err != nil { log.Fatalf("JSON ͷղੳʹࣦഊ͠·ͨ͠: %v", err ) } log.Println("ʲϔουϥΠϯʳ" + forecast.HeadlineText ) log.Println("ʲຊจʳ" + forecast.Text) FODPEJOHKTPO+40/ύʔαʔˍσίʔμʔ 👇NBJOؔ਺ͷ຤ඌʹॻ͖଍ͯ͠ΈΑ͏ ʮgo run .ʯʮgo run . -c 016000ʯͷ࣮ߦ݁Ռ͸ʁ

45&1UJNF ReportDatetime time.Time `json:"reportDatetime"` UJNF೔෇΍࣌ࠁΛѻ͏ͱ͖ʹඞཁʹͳΔϥΠϒϥϦ   ॻࣜͷࢦఆ͕ಠಛʜ 👇GPSFDBTUͷߏ଄ମʹϑΟʔϧυΛ଍ͯ͠ΈΑ͏ log.Println("ʲใࠂ࣌ࠁʳ"
+ forecast.ReportDatetime.Format("2006೥01݄02೔ 15࣌04෼")) 👇NBJOؔ਺ͷ຤ඌʹॻ͖଍ͯ͠ΈΑ͏ ʮgo run .ʯʮgo run . -c 016000ʯͷ࣮ߦ݁Ռ͸ʁ

ίʔυྫͷඋߟ w ࠓճར༻ͨ͠ؾ৅ிͷ63-͸ެࣜͷ"1*Ͱ͸ͳ͘࢓༷ͷܧଓੑ͸อূ͞Ε ͍ͯ·ͤΜ͕ɺ੓෎ඪ४ར༻ن໿ͷԼͰར༻Ͱ͖·͢   ࢀߟIUUQTUXJUUFSDPNF@UPZPEBTUBUVT T w
ΤϦΞίʔυ͸ɺҎԼͷϖʔδΛ։͍ͯௐ΂͍ͨ஍఺Λબ୒ޙɺϒϥ΢βʹ දࣔ͞Εͨ63-ͷBSFB@DPEFͱ͍͏ΫΤϦύϥϝʔλ͔Β࠾औͰ͖·͢   👉IUUQTXXXKNBHPKQCPTBJGPSFDBTU w SFTQ#PEZ$MPTF ͸ࣦഊ࣌FSSPSܕ͕ฦ٫͞ΕΔͷͰɺ͜ΕΛर͏ʹ͸ ҎԼͷΑ͏ʹॻ͖·͢   defer func() {  if err := resp.Body.Close(); err != nil {  log.Printf(“ೖྗετϦʔϜͷΫϩʔζʹࣦഊ͠·ͨ͠: %v", err)  }  }()

ޙͷճͰ঺հ͢Δ΋ͷ w OFUIUUQͷαʔόʔػೳͱIUNMUFNQMBUF͸ ୈճͰઆ໌༧ఆ w TZODύοέʔδ͸ୈճͰઆ໌༧ఆ w UFTUJOHύοέʔδ͸ୈճͰઆ໌༧ఆ w EBUBCBTFύοέʔδ͸ୈճͰઆ໌༧ఆ

࠷ۙͷΞοϓσʔτ

DPOUFYUͷొ৔ (P͔ΒDPOUFYUϥΠϒϥϦ͕ొ৔   λΠϜΞ΢τॲཧͳͲͷѻ͍͕ΑΓ໌շʹ url := flag.String("u", "https://www.desamis.co.jp/", "URL"
) timeout := flag.Duration("t", 500 * time.Millisecond, "઀ଓλΠϜΞ΢τ" ) flag.Parse( ) ctx, _ := context.WithTimeout(context.Background(), *timeout ) req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil ) if err != nil { panic(err ) } resp, err := new(http.Client).Do(req) // ࢦఆͨ͠λΠϜΞ΢τظؒΛ௒͑Δͱࣦഊ͢Δ σϑΥϧτಈ࡞ʹ೚ͤΔͱ͖͸ context.Background() Λ࢖͏  ઃܭ్தͩͬͨΓͰఆ·Βͳ͍࣌༻ʹ context.TODO() ΋͋Δ 👇

FNCFEͷొ৔ (P͔ΒFNCFEϥΠϒϥϦ͕ొ৔   ࣮ߦόΠφϦ FYF ʹϑΝΠϧΛαΫοͱຒΊࠐΈʂ package mai n
import ( _ "embed " "fmt " ) //go:embed memo.jso n var memo []byt e func main() { fmt.Println(string(memo) ) } package mai n import ( "embed " "fmt " ) //go:embed publi c var public embed.F S func main() { memo, _ := public.ReadFile("public/memo.json" ) fmt.Println(string(memo) ) } ϑΝΠϧΛຒΊࠐΉ σΟϨΫτϦΛ·Δ͝ͱຒΊࠐΉ

JPJPVUJMͷ࣮࣭ഇࢭ (P͔ΒJPJPVUJMͷػೳ͕PTͱJPʹҠ২   ࠓޙ͸ޓ׵ੑͷͨΊʹ࢒͞ΕΔ͚ͩͱͳΔ #FGPSF "GUFS ioutil.Discard io.Discard ioutil.NopCloser
io.NopCloser ioutil.ReadAll io.ReadAll ioutil.ReadDir os.ReadDir ioutil.ReadFile os.ReadFile ioutil.TempDir os.MkdirTemp ioutil.TempFile os.CreateTemp ioutil.WriteFile os.WriteFile

࿅श

࿅श໰୊ w ࿅श໰୊ 1 <ϑΥϧμ໊EBZFY> w ·ͣ͸1ͷGFUDIͷࣸܦ͔Β w ࿅श໰୊ 1
<ϑΥϧμ໊EBZFY> w ͖͞΄ͲͷϋϯζΦϯͰطʹ௨ͬͨಓͳͷͰ ؆୯Ͱ͢Ͷ

ʙղઆλΠϜʙ

͕࣌ؒ༨ͬͨΒʜ w ࿅श໰୊ 1 <ϑΥϧμ໊EBZ FY> w ·ͣ͸11ͷHJUIVCΛEBZHJUIVC ϑΥϧμʹ࣮૷ɺ࣍ʹ11ͷJTTVFT ΛEBZFYϑΥϧμʹ࣮૷͔ͯ͠Βணख
w ࿅श໰୊ 1 <ϑΥϧμ໊EBZFY> w ·ͣ͸11ͷMJTTBKPVTͷࣸܦ͔Β

ίʔυΛॻ͖ऴ͑ͨΒ w ʮϢʔβʔ໊QSBDUJDFʯϒϥϯνͰ࡞ۀ͍ͯ͠Δ͜ͱΛ֬ೝ͍ͯͩ͘͠͞ w 74ίʔυͷҰ൪ࠨԼʹදࣔ͞Ε͍ͯ·͢ w มߋΛεςʔδ͠ɺίϛοτ͍ͯͩ͘͠͞ w 74ίʔυͷࠨϝχϡʔͷʮιʔε؅ཧʯ͔Βૢ࡞ w
ίʔυΛ(JU)VCʹϓογϡ͍ͯͩ͘͠͞ w 74ίʔυͷҰ൪ࠨԼͷϒϥϯν໊ͷ͙͢ӈʹ͋ΔΞΠίϯ͔Βૢ࡞ ্ਤ w ϓϧϦΫΤετΛ࡞੒͍ͯͩ͘͠͞ w ʮιʔε؅ཧʯͷ্෦ʹΞΠίϯ͕͋Γ·͢

࣍ճ༧ࠂ w ࣍ճ͸   ʮϞδϡʔϧγεςϜͱ֎෦ϥΠϒϥϦʯͰ͢ w ෼͔Βͳ͔ͬͨͱ͜Ζ΍࣭໰ͳͲ͸ɺࣾ಺ 4MBDLHPQIFSTνϟϯωϧʹ౤ߘ͍ͩ͘͞ w ຊ೔ͷ಺༰ΛΑΓਂ͘ཧղ͍ͨ͠ํ͸ɺεϥΠ
υ QLHHPEFW΢ΣϒαΠτ ΛಡΜͰΈͯ ͍ͩ͘͞

DESAMIS Go Training Season 1 Day 5

DESAMIS Go Training Season 1 Day 5

Yutaka Kato

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(Pݚमୈظ %": :VUBLB,BUP   3% %&4".4 %&4".4ࣾ಺ݚम

˞ લճͷ13ͷ   ղઆλΠϜ

ݚमܭը ճ ೔࣍ ༧ఆ λΠτϧ ୈճ Ր (Pͷجຊ

ຊ೔ͷΰʔϧ w 🚩ΰʔϧ w (Pͷ๛෋ͳඪ४ϥΠϒϥϦΛ၆ᛌ͢Δ w Α͘࢖͏ϥΠϒϥϦΛ࣮ࡍʹ࢖ͬͯΈΔ w ❌ΰʔϧͰ͸ͳ͍ w

ඪ४ϥΠϒϥϦͷ   า͖ํ

τοϓϨϕϧͷҰཡ BSDIJWF DSZQUP fl BH JP QMVHJO TZOD CV

ࣾ಺ίʔυͷར༻࣮੷ BSDIJWF DSZQUP fl BH JP QMVHJO TZOD CV

ଟ਺ͷαϒσΟϨΫτϦ w BSDIJWFUBSBSDIJWF[JQ w DPNQSFTTC[JQDPNQSFTT fl BUFDPNQSFTTH[JQ DPNQSFTTM[XDPNQSFTT[MJC w DPOUBJOFSIFBQDPOUBJOFSMJTUDPOUBJOFSSJOH

า͖ํ w QLHHPEFW΢ΣϒαΠτ w ϒϥ΢βͰશମΛ၆ᛌ͠ͳ͕Β୳͍ͨ͠ͱ͖ w HPEPDίϚϯυ w ࢖͏ύοέʔδ͸ܾ·͍ͬͯΔͱ͖ w

QLHHPEFW΢ΣϒαΠτ 👉IUUQTQLHHPEFWTUE

HPEPDίϚϯυ FODPEJOHDTWΛௐ΂͍ͨͳˠgo doc csv ·ͣ͸/FX8SJUFSؔ਺͔ͳʜˠgo doc csv.NewWriter

(JU)VCͷίʔυ w (Pͷίʔυ͸(JU)VCͰ ΋ ެ։͞Ε͍ͯΔ   IUUQTHJUIVCDPNHPMBOHHP w ඪ४ϥΠϒϥϦ͕͋Δͷ͸TSDҎԼ

ඪ४ϥΠϒϥϦ   ࣮ફϋϯζΦϯ

45&1 fl BH package mai n import ( "flag "

45&1OFUIUUQ resp, err := http.Get("https://www.jma.go.jp" + "/bosai/forecast/data/overview_forecast/" + *areaCode +

45&1JP body, err := io.ReadAll(resp.Body ) if err

45&1MPH if err != nil { log.Fatalf("઀ଓͰ͖·ͤΜͰͨ͠: %v", err )

45&1FODPEJOHKTPO if resp.StatusCode != http.StatusOK { log.Fatalf("HTTP %s: %v",

45&1UJNF ReportDatetime time.Time `json:"reportDatetime"` UJNF೔෇΍࣌ࠁΛѻ͏ͱ͖ʹඞཁʹͳΔϥΠϒϥϦ   ॻࣜͷࢦఆ͕ಠಛʜ 👇GPSFDBTUͷߏ଄ମʹϑΟʔϧυΛ଍ͯ͠ΈΑ͏ log.Println("ʲใࠂ࣌ࠁʳ"

ίʔυྫͷඋߟ w ࠓճར༻ͨ͠ؾ৅ிͷ63-͸ެࣜͷ"1*Ͱ͸ͳ͘࢓༷ͷܧଓੑ͸อূ͞Ε ͍ͯ·ͤΜ͕ɺ੓෎ඪ४ར༻ن໿ͷԼͰར༻Ͱ͖·͢   ࢀߟIUUQTUXJUUFSDPNF@UPZPEBTUBUVT T w

ޙͷճͰ঺հ͢Δ΋ͷ w OFUIUUQͷαʔόʔػೳͱIUNMUFNQMBUF͸ ୈճͰઆ໌༧ఆ w TZODύοέʔδ͸ୈճͰઆ໌༧ఆ w UFTUJOHύοέʔδ͸ୈճͰઆ໌༧ఆ w EBUBCBTFύοέʔδ͸ୈճͰઆ໌༧ఆ

࠷ۙͷΞοϓσʔτ

DPOUFYUͷొ৔ (P͔ΒDPOUFYUϥΠϒϥϦ͕ొ৔   λΠϜΞ΢τॲཧͳͲͷѻ͍͕ΑΓ໌շʹ url := flag.String("u", "https://www.desamis.co.jp/", "URL"

FNCFEͷొ৔ (P͔ΒFNCFEϥΠϒϥϦ͕ొ৔   ࣮ߦόΠφϦ FYF ʹϑΝΠϧΛαΫοͱຒΊࠐΈʂ package mai n

JPJPVUJMͷ࣮࣭ഇࢭ (P͔ΒJPJPVUJMͷػೳ͕PTͱJPʹҠ২   ࠓޙ͸ޓ׵ੑͷͨΊʹ࢒͞ΕΔ͚ͩͱͳΔ #FGPSF "GUFS ioutil.Discard io.Discard ioutil.NopCloser

࿅श

࿅श໰୊ w ࿅श໰୊ 1 <ϑΥϧμ໊EBZFY> w ·ͣ͸1ͷGFUDIͷࣸܦ͔Β w ࿅श໰୊ 1

ʙղઆλΠϜʙ

͕࣌ؒ༨ͬͨΒʜ w ࿅श໰୊ 1 <ϑΥϧμ໊EBZ FY> w ·ͣ͸11ͷHJUIVCΛEBZHJUIVC ϑΥϧμʹ࣮૷ɺ࣍ʹ11ͷJTTVFT ΛEBZFYϑΥϧμʹ࣮૷͔ͯ͠Βணख

ίʔυΛॻ͖ऴ͑ͨΒ w ʮϢʔβʔ໊QSBDUJDFʯϒϥϯνͰ࡞ۀ͍ͯ͠Δ͜ͱΛ֬ೝ͍ͯͩ͘͠͞ w 74ίʔυͷҰ൪ࠨԼʹදࣔ͞Ε͍ͯ·͢ w มߋΛεςʔδ͠ɺίϛοτ͍ͯͩ͘͠͞ w 74ίʔυͷࠨϝχϡʔͷʮιʔε؅ཧʯ͔Βૢ࡞ w

࣍ճ༧ࠂ w ࣍ճ͸   ʮϞδϡʔϧγεςϜͱ֎෦ϥΠϒϥϦʯͰ͢ w ෼͔Βͳ͔ͬͨͱ͜Ζ΍࣭໰ͳͲ͸ɺࣾ಺ 4MBDLHPQIFSTνϟϯωϧʹ౤ߘ͍ͩ͘͞ w ຊ೔ͷ಺༰ΛΑΓਂ͘ཧղ͍ͨ͠ํ͸ɺεϥΠ