pgspider http fdw试用

pgsql-http 是一个很不错的 处理http 请求的扩展，我们可以用来方便的处理http 请求
以下是一个简单的试用（包括docker 镜像构建）

pgsql-http 镜像

使用pgspider 的base 镜像

• dockerfile

 

FROM dalongrong/pgspider:base as build

WORKDIR /app

RUN apt-get update && apt-get install -y libssl-dev libcurl4-openssl-dev

RUN git clone https://github.com/pramsey/pgsql-http.git /app/postgresql-11.6/contrib/pgsql-http

RUN cd /app/postgresql-11.6/contrib/pgsql-http && make && make install

​

FROM debian:stretch-slim

ENV GOSU_VERSION 1.11

RUN apt-get update && apt-get install -y wget libssl-dev libcurl4-openssl-dev libreadline-dev

# explicitly set user/group IDs

RUN set -eux; 

 groupadd -r postgres --gid=999; 

# https://salsa.debian.org/postgresql/postgresql-common/blob/997d842ee744687d99a2b2d95c1083a2615c79e8/debian/postgresql-common.postinst#L32-35

 useradd -r -g postgres --uid=999 --home-dir=/var/lib/postgresql --shell=/bin/bash postgres; 

# also create the postgres user's home directory with appropriate permissions

# see https://github.com/docker-library/postgres/issues/274

 mkdir -p /var/lib/postgresql; 

 chown -R postgres:postgres /var/lib/postgresql

​

RUN wget -O /usr/local/bin/gosu "https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-$(dpkg --print-architecture)" 

   && chmod +x /usr/local/bin/gosu 

   && gosu nobody true

# make the "en_US.UTF-8" locale so postgres will be utf-8 enabled by default

RUN set -eux; 

   if [ -f /etc/dpkg/dpkg.cfg.d/docker ]; then 

   # if this file exists, we're likely in "debian:xxx-slim", and locales are thus being excluded so we need to remove that exclusion (since we need locales)

   grep -q '/usr/share/locale' /etc/dpkg/dpkg.cfg.d/docker; 

   sed -ri '//usr/share/locale/d' /etc/dpkg/dpkg.cfg.d/docker; 

   ! grep -q '/usr/share/locale' /etc/dpkg/dpkg.cfg.d/docker; 

   fi; 

   apt-get update; apt-get install -y locales; rm -rf /var/lib/apt/lists/*; 

   localedef -i en_US -c -f UTF-8 -A /usr/share/locale/locale.alias en_US.UTF-8

ENV LANG en_US.utf8

​

# install "nss_wrapper" in case we need to fake "/etc/passwd" and "/etc/group" (especially for OpenShift)

# https://github.com/docker-library/postgres/issues/359

# https://cwrap.org/nss_wrapper.html

RUN set -eux; 

   apt-get update; 

   apt-get install -y --no-install-recommends libnss-wrapper; 

   rm -rf /var/lib/apt/lists/*

​

RUN mkdir /docker-entrypoint-initdb.d

COPY --from=build /usr/local/pgspider /usr/local/pgspider

RUN sed -ri "s!^#?(listen_addresses)s*=s*S+.*!1 = '*'!" /usr/local/pgspider/share/postgresql/postgresql.conf.sample; 

   grep -F "listen_addresses = '*'" /usr/local/pgspider/share/postgresql/postgresql.conf.sample

RUN mkdir -p /var/run/postgresql && chown -R postgres:postgres /var/run/postgresql && chmod 2777 /var/run/postgresql

ENV PATH $PATH:/usr/local/pgspider/bin

ENV PGDATA /var/lib/postgresql/data

RUN mkdir -p "$PGDATA" && chown -R postgres:postgres "$PGDATA" && chmod 777 "$PGDATA"

VOLUME /var/lib/postgresql/data

COPY docker-entrypoint.sh /usr/local/bin/

RUN ln -s usr/local/bin/docker-entrypoint.sh / # backwards compat

ENTRYPOINT ["docker-entrypoint.sh"]

​

EXPOSE 5432

CMD ["postgres"]

使用

• docker-compose 文件

version: "3"

services: 

    pg-http:

     image: dalongrong/pgspider:http

     ports: 

     - "5432:5432"

     environment: 

     - "POSTGRES_PASSWORD=dalong"

• 启动

docker-compose up -d

• 使用

CREATE EXTENSION http;

SELECT content FROM http_get('http://httpbin.org/ip');

• 效果

说明

http fdw 提供的功能还是比较强大，支持多种http verb 操作，以及url 编码

参考资料

https://github.com/pramsey/pgsql-http
https://github.com/rongfengliang/pgspider-docker