2

我正在关注 [这篇文章 ( http://adpgtech.blogspot.com.br/2013/03/loading-useful-modules-in-plv8.html ) 将 Node 模块加载到 Postgres PLV8 中。它可以工作，除了plv8_startup()在 Postgres 启动时运行该函数。我在 Docker 容器中运行 Postgres，所以在我的 Docker 文件中，我调用以下命令让它运行上述函数：

sed -e "\$aplv8.start_proc = 'plv8_startup'" /var/lib/postgresql/data/postgresql.conf

不幸的是，当我调用使用 PLV8 的函数时，我正在加载的外部模块是未定义的。但是，如果我在数据库启动并运行后进入 PSQL ，节点模块会为该连接select plv8_startup()正确加载。可悲的是，如果我打开到数据库的新连接并尝试运行我的 PLV8 函数，外部模块再次未定义，我不得不再次运行。select plv8_startup()

作为参考，这是我的文件：

// Dockerfile
FROM postgres:9.4

# install PLV8
RUN apt-get update && apt-get install -y postgresql-9.4-plv8

# copy any functions to be loaded
COPY sql/*.sql /sql/

# setup database and schema
COPY setup-schema.sh /docker-entrypoint-initdb.d/

块引用

// setup-schema.sh
#!/bin/bash

# setup PLV8 to load on startup
sed -e "\$aplv8.start_proc = 'plv8_startup'" /var/lib/postgresql/data/postgresql.conf

psql -U postgres <<EOSQL
   CREATE DATABASE scout;
   CREATE USER scout;
   GRANT ALL PRIVILEGES ON DATABASE scout to scout;
EOSQL

# setup PLV8 module loading
psql -U postgres --dbname test -c 'CREATE EXTENSION plv8'
psql -U scout --dbname test < /sql/plv8_startup.sql

块引用

// plv8_startup.sql (loaded by Dockerfile)
-- create a table to store external javascript modules we'd like to use in our functions
CREATE TABLE plv8_modules(modname text primary key, load_on_start boolean, code text);

-- function makes our external javascript modules available to our functions
CREATE OR REPLACE FUNCTION plv8_startup()
returns void
language plv8
as
$$
  load_module = function(modname)
  {
      var rows = plv8.execute("SELECT code from plv8_modules " +
                              " where modname = $1", [modname]);
      for (var r = 0; r < rows.length; r++)
      {
          var code = rows[r].code;
          eval("(function() { " + code + "})")();
      }

  };

  // now load all the modules marked for loading on start
  var rows = plv8.execute("SELECT modname, code from plv8_modules where load_on_start");
  for (var r = 0; r < rows.length; r++)
  {
   var code = rows[r].code;
   eval("(function() { " + code + "})")();
  }
$$;

-- load the rrule.js module
INSERT INTO plv8_modules VALUES ('code', true, '(function(u){var l=typeof module!=="undefined"&&module.exports;var k=function(){if(!k._nlp){if(l){k._nlp=require("./nlp")}else{if(!(k._nlp=u._RRuleNLP)){throw new Error("You need to include rrule/nlp.js for fromText/toText to work.")}}}return k._nlp};var w={MONTH_DAYS:[31,28,31,30,31,30,31,31,30,31,30,31],ONE_DAY:1000*60*60*24,MAXYEAR:9999,ORDINAL_BASE:new Date(1970,0,1),PY_WEEKDAYS:[6,0,1,2,3,4,5],getYearDay:function(C){var D=new Date(C.getFullYear(),C.getMonth(),C.getDate());return Math.ceil((D-new Date(C.getFullYear(),0,1))/w.ONE_DAY)+1},isLeapYear:function(C){if(C instanceof Date){C=C.getFullYear()}return((C%4===0)&&(C%100!==0))||(C%400===0)},tzOffset:function(C){return C.getTimezoneOffset()*60*1000},daysBetween:function(G,F){var E=G.getTime()-w.tzOffset(G);var D=F.getTime()-w.tzOffset(F);var C=Math.abs(E-D);return Math.round(C/w.ONE_DAY)},toOrdinal:function(C){return w.daysBetween(C,w.ORDINAL_BASE)},fromOrdinal:function(C){var 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X=w.monthRange(G,C-1)[1];if(ab>X){while(ab>X){ab-=X;++C;if(C==13){C=1;++G;if(G>w.MAXYEAR){this._len=ai;return P.getValue()}}X=w.monthRange(G,C-1)[1]}am.rebuild(G,C)}}}}};c.parseString=function(D){D=D.replace(/^\s+|\s+$/,"");if(!D.length){return null}var F,E,K,J,G,L=D.split(";"),N={};for(F=0;F<L.length;F++){G=L[F].split("=");K=G[0];J=G[1];switch(K){case"FREQ":N.freq=c[J];break;case"WKST":N.wkst=c[J];break;case"COUNT":case"INTERVAL":case"BYSETPOS":case"BYMONTH":case"BYMONTHDAY":case"BYYEARDAY":case"BYWEEKNO":case"BYHOUR":case"BYMINUTE":case"BYSECOND":if(J.indexOf(",")!=-1){J=J.split(",");for(E=0;E<J.length;E++){if(/^[+-]?\d+$/.test(J[E])){J[E]=Number(J[E])}}}else{if(/^[+-]?\d+$/.test(J)){J=Number(J)}}K=K.toLowerCase();N[K]=J;break;case"BYDAY":var C,H,I,M=J.split(",");N.byweekday=[];for(E=0;E<M.length;E++){I=M[E];if(I.length==2){H=c[I];N.byweekday.push(H)}else{I=I.match(/^([+-]?\d)([A-Z]{2})$/);C=Number(I[1]);H=I[2];H=c[H].weekday;N.byweekday.push(new v(H,C))}}break;case"DTSTART":N.dtstart=w.untilStringToDate(J);break;case"UNTIL":N.until=w.untilStringToDate(J);break;case"BYEASTER":N.byeaster=Number(J);break;default:throw new Error("Unknown RRULE property ''"+K+"''")}}return N};c.fromString=function(C){return new c(c.parseString(C))};var n=function(C){this.rrule=C;this.lastyear=null;this.lastmonth=null;this.yearlen=null;this.nextyearlen=null;this.yearordinal=null;this.yearweekday=null;this.mmask=null;this.mrange=null;this.mdaymask=null;this.nmdaymask=null;this.wdaymask=null;this.wnomask=null;this.nwdaymask=null;this.eastermask=null};n.prototype.easter=function(D,C){C=C||0;var T=D%19,R=Math.floor(D/100),P=D%100,O=Math.floor(R/4),M=R%4,L=Math.floor((R+8)/25),K=Math.floor((R-L+1)/3),J=Math.floor(19*T+R-O-K+15)%30,I=Math.floor(P/4),G=P%4,F=Math.floor(32+2*M+2*I-J-G)%7,E=Math.floor((T+11*J+22*F)/451),S=Math.floor((J+F-7*E+114)/31),H=(J+F-7*E+114)%31+1,Q=Date.UTC(D,S-1,H+C),N=Date.UTC(D,0,1);return[Math.ceil((Q-N)/(1000*60*60*24))]};n.prototype.rebuild=function(L,X){var H=this.rrule;if(L!=this.lastyear){this.yearlen=w.isLeapYear(L)?366:365;this.nextyearlen=w.isLeapYear(L+1)?366:365;var O=new Date(L,0,1);this.yearordinal=w.toOrdinal(O);this.yearweekday=w.getWeekday(O);var M=w.getWeekday(new Date(L,0,1));if(this.yearlen==365){this.mmask=[].concat(d);this.mdaymask=[].concat(m);this.nmdaymask=[].concat(B);this.wdaymask=e.slice(M);this.mrange=[].concat(g)}else{this.mmask=[].concat(z);this.mdaymask=[].concat(b);this.nmdaymask=[].concat(r);this.wdaymask=e.slice(M);this.mrange=[].concat(o)}if(!s(H.options.byweekno)){this.wnomask=null}else{this.wnomask=j(0,this.yearlen+7);var V,I,E;V=I=a(7-this.yearweekday+H.options.wkst,7);if(V>=4){V=0;E=this.yearlen+a(this.yearweekday-H.options.wkst,7)}else{E=this.yearlen-V}var N=Math.floor(E/7);var Y=a(E,7);var C=Math.floor(N+(Y/4));for(var P,T,S=0;S<H.options.byweekno.length;S++){P=H.options.byweekno[S];if(P<0){P+=C+1}if(!(0<P&&P<=C)){continue}if(P>1){T=V+(P-1)*7;if(V!=I){T-=7-I}}else{T=V}for(var Q=0;Q<7;Q++){this.wnomask[T]=1;T++;if(this.wdaymask[T]==H.options.wkst){break}}}if(f(H.options.byweekno,1)){var T=V+C*7;if(V!=I){T-=7-I}if(T<this.yearlen){for(var S=0;S<7;S++){this.wnomask[T]=1;T+=1;if(this.wdaymask[T]==H.options.wkst){break}}}}if(V){var K;if(!f(H.options.byweekno,-1)){var R=w.getWeekday(new Date(L-1,0,1));var U=a(7-R+H.options.wkst,7);var D=w.isLeapYear(L-1)?366:365;if(U>=4){U=0;K=Math.floor(52+a(D+a(R-H.options.wkst,7),7)/4)}else{K=Math.floor(52+a(this.yearlen-V,7)/4)}}else{K=-1}if(f(H.options.byweekno,K)){for(var T=0;T<V;T++){this.wnomask[T]=1}}}}}if(s(H.options.bynweekday)&&(X!=this.lastmonth||L!=this.lastyear)){var F=[];if(H.options.freq==c.YEARLY){if(s(H.options.bymonth)){for(S=0;S<H.options.bymonth.length;S++){X=H.options.bymonth[S];F.push(this.mrange.slice(X-1,X+1))}}else{F=[[0,this.yearlen]]}}else{if(H.options.freq==c.MONTHLY){F=[this.mrange.slice(X-1,X+1)]}}if(s(F)){this.nwdaymask=j(0,this.yearlen);for(var S=0;S<F.length;S++){var W=F[S];var G=W[0],J=W[1];J-=1;for(var Q=0;Q<H.options.bynweekday.length;Q++){var M=H.options.bynweekday[Q][0],P=H.options.bynweekday[Q][1];if(P<0){T=J+(P+1)*7;T-=a(this.wdaymask[T]-M,7)}else{T=G+(P-1)*7;T+=a(7-this.wdaymask[T]+M,7)}if(G<=T&&T<=J){this.nwdaymask[T]=1}}}}this.lastyear=L;this.lastmonth=X}if(H.options.byeaster!==null){this.eastermask=this.easter(L,H.options.byeaster)}};n.prototype.ydayset=function(D,E,C){return[q(this.yearlen),0,this.yearlen]};n.prototype.mdayset=function(F,G,D){var I=j(null,this.yearlen);var H=this.mrange[G-1];var C=this.mrange[G];for(var E=H;E<C;E++){I[E]=E}return[I,H,C]};n.prototype.wdayset=function(F,G,C){var I=j(null,this.yearlen+7);var E=w.toOrdinal(new Date(F,G-1,C))-this.yearordinal;var H=E;for(var D=0;D<7;D++){I[E]=E;++E;if(this.wdaymask[E]==this.rrule.options.wkst){break}}return[I,H,E]};n.prototype.ddayset=function(E,F,C){var G=j(null,this.yearlen);var D=w.toOrdinal(new Date(E,F-1,C))-this.yearordinal;G[D]=D;return[G,D,D+1]};n.prototype.htimeset=function(C,I,F,H){var J=[],E=this.rrule;for(var G=0;G<E.options.byminute.length;G++){I=E.options.byminute[G];for(var D=0;D<E.options.bysecond.length;D++){F=E.options.bysecond[D];J.push(new w.Time(C,I,F,H))}}w.sort(J);return J};n.prototype.mtimeset=function(C,H,F,G){var I=[],E=this.rrule;for(var D=0;D<E.options.bysecond.length;D++){F=E.options.bysecond[D];I.push(new w.Time(C,H,F,G))}w.sort(I);return I};n.prototype.stimeset=function(C,F,D,E){return[new w.Time(C,F,D,E)]};var t=function(D,C){this.init(D,C)};t.prototype={init:function(D,C){this.method=D;this.args=C;this._result=[];this.minDate=null;this.maxDate=null;if(D=="between"){this.maxDate=C.inc?C.before:new Date(C.before.getTime()-1);this.minDate=C.inc?C.after:new Date(C.after.getTime()+1)}else{if(D=="before"){this.maxDate=C.inc?C.dt:new Date(C.dt.getTime()-1)}else{if(D=="after"){this.minDate=C.inc?C.dt:new Date(C.dt.getTime()+1)}}}},accept:function(D){var E=this.minDate&&D<this.minDate,C=this.maxDate&&D>this.maxDate;if(this.method=="between"){if(E){return true}if(C){return false}}else{if(this.method=="before"){if(C){return false}}else{if(this.method=="after"){if(E){return true}this.add(D);return false}}}return this.add(D)},add:function(C){this._result.push(C);return true},getValue:function(){switch(this.method){case"all":case"between":return this._result;case"before":case"after":return this._result.length?this._result[this._result.length-1]:null}}};var A=function(F,D,E){var C=["all","between"];if(!f(C,F)){throw new Error(''Invalid method "''+F+''". Only all and between works with iterator.'')}this.add=function(G){if(E(G,this._result.length)){this._result.push(G);return true}return false};this.init(F,D)};A.prototype=t.prototype;if(l){module.exports={RRule:c}}if(typeof ender==="undefined"){u.RRule=c}if(typeof define==="function"&&define.amd){define("rrule",[],function(){return c})}}(this));');

块引用

// this is the function I am attempting to call when the external node module is said to be undefined
CREATE OR REPLACE FUNCTION public.generate_recurrences(recurrence_pattern CHARACTER VARYING, start_date date, end_date date)
 RETURNS SETOF TEXT
 LANGUAGE plv8
 IMMUTABLE STRICT
AS $function$

      // parse the RRULE string
      var rule = RRule.fromString(recurrence_pattern);

      // return all occurrences between start date and end date
      var recurrences = rule.between(start_date, end_date);

      for(var i = 0; i < recurrences.length; i++) {
        plv8.return_next(new Date(recurrences[i]).toISOString());
      }

    $function$

任何建议将不胜感激！

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