/
main.go
171 lines (157 loc) · 6.08 KB
/
main.go
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// span-crossref-members fetches crossref members api. It will merely paginate
// through the api responses and will output one response per line. Create
// mapping from DOI to name: span-crossref-members | jq -rc '.message.items[].prefix[] |
// {(.value|tostring): .name}' | jq -s add > assets/crossref/members.json
package main
import (
"bytes"
"github.com/segmentio/encoding/json"
"flag"
"fmt"
"io"
"io/ioutil"
"log"
"net/http"
"net/url"
"os"
"time"
"github.com/miku/span"
)
// MembersResponse from api.crossref.org/member, generated by JSONGen, use offset to paginate.
type MembersResponse struct {
Message struct {
Items []struct {
Breakdowns interface{} `json:"breakdowns"`
Counts struct {
BackfileDois int64 `json:"backfile-dois"`
CurrentDois int64 `json:"current-dois"`
TotalDois int64 `json:"total-dois"`
} `json:"counts"`
CountsType interface{} `json:"counts-type"`
Coverage interface{} `json:"coverage"`
CoverageType interface{} `json:"coverage-type"`
Flags struct {
Deposits bool `json:"deposits"`
DepositsAbstractsBackfile bool `json:"deposits-abstracts-backfile"`
DepositsAbstractsCurrent bool `json:"deposits-abstracts-current"`
DepositsAffiliationsBackfile bool `json:"deposits-affiliations-backfile"`
DepositsAffiliationsCurrent bool `json:"deposits-affiliations-current"`
DepositsArticles bool `json:"deposits-articles"`
DepositsAwardNumbersBackfile bool `json:"deposits-award-numbers-backfile"`
DepositsAwardNumbersCurrent bool `json:"deposits-award-numbers-current"`
DepositsFundersBackfile bool `json:"deposits-funders-backfile"`
DepositsFundersCurrent bool `json:"deposits-funders-current"`
DepositsLicensesBackfile bool `json:"deposits-licenses-backfile"`
DepositsLicensesCurrent bool `json:"deposits-licenses-current"`
DepositsOpenReferencesBackfile bool `json:"deposits-open-references-backfile"`
DepositsOpenReferencesCurrent bool `json:"deposits-open-references-current"`
DepositsOrcidsBackfile bool `json:"deposits-orcids-backfile"`
DepositsOrcidsCurrent bool `json:"deposits-orcids-current"`
DepositsReferencesBackfile bool `json:"deposits-references-backfile"`
DepositsReferencesCurrent bool `json:"deposits-references-current"`
DepositsResourceLinksBackfile bool `json:"deposits-resource-links-backfile"`
DepositsResourceLinksCurrent bool `json:"deposits-resource-links-current"`
DepositsSimilarityCheckingBackfile bool `json:"deposits-similarity-checking-backfile"`
DepositsSimilarityCheckingCurrent bool `json:"deposits-similarity-checking-current"`
DepositsUpdatePoliciesBackfile bool `json:"deposits-update-policies-backfile"`
DepositsUpdatePoliciesCurrent bool `json:"deposits-update-policies-current"`
} `json:"flags"`
Id int64 `json:"id"`
LastStatusCheckTime int64 `json:"last-status-check-time"`
Location string `json:"location"`
Names []string `json:"names"`
Prefix []struct {
Name string `json:"name"`
PublicReferences bool `json:"public-references"`
ReferenceVisibility string `json:"reference-visibility"`
Value string `json:"value"`
} `json:"prefix"`
Prefixes []string `json:"prefixes"`
PrimaryName string `json:"primary-name"`
Tokens []string `json:"tokens"`
} `json:"items"`
ItemsPerPage int64 `json:"items-per-page"`
Query struct {
SearchTerms interface{} `json:"search-terms"`
StartIndex int64 `json:"start-index"`
} `json:"query"`
TotalResults int64 `json:"total-results"`
} `json:"message"`
MessageType string `json:"message-type"`
MessageVersion string `json:"message-version"`
Status string `json:"status"`
}
var (
offset = flag.Int("offset", 0, "offset")
rows = flag.Int("rows", 20, "rows to fetch per request")
base = flag.String("base", "http://api.crossref.org/members", "base url")
sleep = flag.Duration("sleep", 1*time.Second, "time to sleep between requests")
silent = flag.Bool("q", false, "suppress logging output")
version = flag.Bool("version", false, "output version")
retryCount = flag.Int("retry", 3, "retry count on HTTP 500 and similar errors")
)
func main() {
flag.Parse()
if *silent {
log.SetOutput(ioutil.Discard)
}
if *version {
fmt.Println(span.AppVersion)
os.Exit(0)
}
var buf bytes.Buffer
for {
v := url.Values{}
v.Add("offset", fmt.Sprintf("%d", *offset))
v.Add("rows", fmt.Sprintf("%d", *rows))
link := fmt.Sprintf("%s?%s", *base, v.Encode())
// Why: Because an HTTP 500 appeared, which for some reason did not persist.
// ...
// 2019/07/12 16:39:27 http://api.crossref.org/members?offset=5280&rows=20
// 2019/07/12 16:39:28 request failed with HTTP 500
// 2019/07/12 16:39:30 http://api.crossref.org/members?offset=5280&rows=20
// 2019/07/12 16:39:31 done: 5280/13467
// ...
var (
retries int
resp *http.Response
err error
)
for {
if retries > *retryCount {
log.Fatal("retry count exceeded")
}
log.Println(link)
resp, err = http.Get(link)
if err != nil {
log.Fatal(err)
}
defer resp.Body.Close()
if resp.StatusCode < 400 {
break
}
log.Printf("request failed with HTTP %d", resp.StatusCode)
time.Sleep(2 * time.Second)
retries++
}
tee := io.TeeReader(resp.Body, &buf)
// Need to peek into offset and total results.
dec := json.NewDecoder(tee)
var mr MembersResponse
if err := dec.Decode(&mr); err != nil {
log.Printf("decode failed: %s", buf.String())
log.Fatal(err)
}
if mr.Status != "ok" {
log.Fatalf("status not ok: %s", mr.Status)
}
if mr.Message.Query.StartIndex >= mr.Message.TotalResults {
break
}
log.Printf("done: %d/%d", mr.Message.Query.StartIndex, mr.Message.TotalResults)
time.Sleep(*sleep)
*offset = *offset + *rows
fmt.Println(buf.String())
buf.Truncate(0)
}
}