mirror of
https://github.com/troydhanson/tpl.git
synced 2024-12-26 23:57:25 +08:00
1104 lines
28 KiB
HTML
1104 lines
28 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
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"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
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<head>
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<meta http-equiv="Content-Type" content="application/xhtml+xml; charset=UTF-8" />
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<meta name="generator" content="AsciiDoc 8.6.8" />
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<title>tpl Perl API</title>
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<style type="text/css">
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/* Shared CSS for AsciiDoc xhtml11 and html5 backends */
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/* Default font. */
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body {
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font-family: Georgia,serif;
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}
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/* Title font. */
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h1, h2, h3, h4, h5, h6,
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div.title, caption.title,
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thead, p.table.header,
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#toctitle,
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#author, #revnumber, #revdate, #revremark,
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#footer {
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font-family: Arial,Helvetica,sans-serif;
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}
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body {
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margin: 1em 5% 1em 5%;
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}
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a {
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color: blue;
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text-decoration: underline;
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}
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a:visited {
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color: fuchsia;
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}
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em {
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font-style: italic;
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color: navy;
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}
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strong {
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font-weight: bold;
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color: #083194;
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}
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h1, h2, h3, h4, h5, h6 {
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color: #527bbd;
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margin-top: 1.2em;
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margin-bottom: 0.5em;
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line-height: 1.3;
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}
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h1, h2, h3 {
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border-bottom: 2px solid silver;
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}
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h2 {
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padding-top: 0.5em;
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}
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h3 {
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float: left;
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}
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h3 + * {
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clear: left;
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}
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h5 {
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font-size: 1.0em;
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}
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div.sectionbody {
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margin-left: 0;
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}
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hr {
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border: 1px solid silver;
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}
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p {
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margin-top: 0.5em;
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margin-bottom: 0.5em;
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}
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ul, ol, li > p {
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margin-top: 0;
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}
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ul > li { color: #aaa; }
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ul > li > * { color: black; }
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.monospaced, code, pre {
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font-family: "Courier New", Courier, monospace;
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font-size: inherit;
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color: navy;
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padding: 0;
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margin: 0;
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}
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#author {
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color: #527bbd;
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font-weight: bold;
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font-size: 1.1em;
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}
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#email {
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}
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#revnumber, #revdate, #revremark {
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}
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#footer {
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font-size: small;
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border-top: 2px solid silver;
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padding-top: 0.5em;
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margin-top: 4.0em;
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}
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#footer-text {
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float: left;
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padding-bottom: 0.5em;
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}
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#footer-badges {
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float: right;
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padding-bottom: 0.5em;
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}
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#preamble {
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margin-top: 1.5em;
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margin-bottom: 1.5em;
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}
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div.imageblock, div.exampleblock, div.verseblock,
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div.quoteblock, div.literalblock, div.listingblock, div.sidebarblock,
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div.admonitionblock {
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margin-top: 1.0em;
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margin-bottom: 1.5em;
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}
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div.admonitionblock {
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margin-top: 2.0em;
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margin-bottom: 2.0em;
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margin-right: 10%;
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color: #606060;
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}
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div.content { /* Block element content. */
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padding: 0;
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}
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/* Block element titles. */
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div.title, caption.title {
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color: #527bbd;
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font-weight: bold;
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text-align: left;
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margin-top: 1.0em;
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margin-bottom: 0.5em;
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}
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div.title + * {
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margin-top: 0;
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}
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td div.title:first-child {
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margin-top: 0.0em;
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}
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div.content div.title:first-child {
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margin-top: 0.0em;
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}
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div.content + div.title {
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margin-top: 0.0em;
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}
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div.sidebarblock > div.content {
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background: #ffffee;
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border: 1px solid #dddddd;
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border-left: 4px solid #f0f0f0;
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padding: 0.5em;
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}
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div.listingblock > div.content {
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border: 1px solid #dddddd;
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border-left: 5px solid #f0f0f0;
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background: #f8f8f8;
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padding: 0.5em;
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}
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div.quoteblock, div.verseblock {
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padding-left: 1.0em;
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margin-left: 1.0em;
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margin-right: 10%;
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border-left: 5px solid #f0f0f0;
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color: #888;
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}
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div.quoteblock > div.attribution {
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padding-top: 0.5em;
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text-align: right;
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}
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div.verseblock > pre.content {
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font-family: inherit;
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font-size: inherit;
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}
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div.verseblock > div.attribution {
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padding-top: 0.75em;
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text-align: left;
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}
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/* DEPRECATED: Pre version 8.2.7 verse style literal block. */
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div.verseblock + div.attribution {
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text-align: left;
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}
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div.admonitionblock .icon {
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vertical-align: top;
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font-size: 1.1em;
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font-weight: bold;
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text-decoration: underline;
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color: #527bbd;
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padding-right: 0.5em;
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}
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div.admonitionblock td.content {
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padding-left: 0.5em;
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border-left: 3px solid #dddddd;
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}
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div.exampleblock > div.content {
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border-left: 3px solid #dddddd;
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padding-left: 0.5em;
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}
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div.imageblock div.content { padding-left: 0; }
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span.image img { border-style: none; vertical-align: text-bottom; }
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a.image:visited { color: white; }
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dl {
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margin-top: 0.8em;
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margin-bottom: 0.8em;
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}
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dt {
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margin-top: 0.5em;
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margin-bottom: 0;
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font-style: normal;
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color: navy;
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}
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dd > *:first-child {
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margin-top: 0.1em;
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}
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ul, ol {
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list-style-position: outside;
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}
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ol.arabic {
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list-style-type: decimal;
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}
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ol.loweralpha {
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list-style-type: lower-alpha;
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}
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ol.upperalpha {
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list-style-type: upper-alpha;
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}
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ol.lowerroman {
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list-style-type: lower-roman;
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}
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ol.upperroman {
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list-style-type: upper-roman;
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}
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div.compact ul, div.compact ol,
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div.compact p, div.compact p,
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div.compact div, div.compact div {
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margin-top: 0.1em;
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margin-bottom: 0.1em;
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}
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tfoot {
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font-weight: bold;
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}
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td > div.verse {
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white-space: pre;
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}
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div.hdlist {
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margin-top: 0.8em;
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margin-bottom: 0.8em;
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}
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div.hdlist tr {
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padding-bottom: 15px;
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}
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dt.hdlist1.strong, td.hdlist1.strong {
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font-weight: bold;
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}
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td.hdlist1 {
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vertical-align: top;
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font-style: normal;
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padding-right: 0.8em;
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color: navy;
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}
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td.hdlist2 {
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vertical-align: top;
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}
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div.hdlist.compact tr {
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margin: 0;
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padding-bottom: 0;
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}
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.comment {
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background: yellow;
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}
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.footnote, .footnoteref {
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font-size: 0.8em;
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}
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span.footnote, span.footnoteref {
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vertical-align: super;
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}
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#footnotes {
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margin: 20px 0 20px 0;
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padding: 7px 0 0 0;
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}
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#footnotes div.footnote {
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margin: 0 0 5px 0;
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}
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#footnotes hr {
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border: none;
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border-top: 1px solid silver;
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height: 1px;
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text-align: left;
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margin-left: 0;
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width: 20%;
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min-width: 100px;
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}
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div.colist td {
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padding-right: 0.5em;
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padding-bottom: 0.3em;
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vertical-align: top;
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}
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div.colist td img {
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margin-top: 0.3em;
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}
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@media print {
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#footer-badges { display: none; }
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}
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#toc {
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margin-bottom: 2.5em;
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}
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#toctitle {
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color: #527bbd;
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font-size: 1.1em;
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font-weight: bold;
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margin-top: 1.0em;
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margin-bottom: 0.1em;
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}
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div.toclevel0, div.toclevel1, div.toclevel2, div.toclevel3, div.toclevel4 {
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margin-top: 0;
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margin-bottom: 0;
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}
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div.toclevel2 {
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margin-left: 2em;
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font-size: 0.9em;
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}
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div.toclevel3 {
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margin-left: 4em;
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font-size: 0.9em;
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}
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div.toclevel4 {
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margin-left: 6em;
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font-size: 0.9em;
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}
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span.aqua { color: aqua; }
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span.black { color: black; }
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span.blue { color: blue; }
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span.fuchsia { color: fuchsia; }
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span.gray { color: gray; }
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span.green { color: green; }
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span.lime { color: lime; }
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span.maroon { color: maroon; }
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span.navy { color: navy; }
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span.olive { color: olive; }
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span.purple { color: purple; }
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span.red { color: red; }
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span.silver { color: silver; }
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span.teal { color: teal; }
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span.white { color: white; }
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span.yellow { color: yellow; }
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span.aqua-background { background: aqua; }
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span.black-background { background: black; }
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span.blue-background { background: blue; }
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span.fuchsia-background { background: fuchsia; }
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span.gray-background { background: gray; }
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span.green-background { background: green; }
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span.lime-background { background: lime; }
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span.maroon-background { background: maroon; }
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span.navy-background { background: navy; }
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span.olive-background { background: olive; }
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span.purple-background { background: purple; }
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span.red-background { background: red; }
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span.silver-background { background: silver; }
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span.teal-background { background: teal; }
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span.white-background { background: white; }
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span.yellow-background { background: yellow; }
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span.big { font-size: 2em; }
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span.small { font-size: 0.6em; }
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span.underline { text-decoration: underline; }
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span.overline { text-decoration: overline; }
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span.line-through { text-decoration: line-through; }
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div.unbreakable { page-break-inside: avoid; }
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/*
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* xhtml11 specific
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*
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* */
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div.tableblock {
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margin-top: 1.0em;
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margin-bottom: 1.5em;
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}
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div.tableblock > table {
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border: 3px solid #527bbd;
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}
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thead, p.table.header {
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font-weight: bold;
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color: #527bbd;
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}
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p.table {
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margin-top: 0;
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}
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/* Because the table frame attribute is overriden by CSS in most browsers. */
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div.tableblock > table[frame="void"] {
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border-style: none;
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}
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div.tableblock > table[frame="hsides"] {
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border-left-style: none;
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border-right-style: none;
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}
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div.tableblock > table[frame="vsides"] {
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border-top-style: none;
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border-bottom-style: none;
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}
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/*
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* html5 specific
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*
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* */
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table.tableblock {
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margin-top: 1.0em;
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margin-bottom: 1.5em;
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}
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thead, p.tableblock.header {
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font-weight: bold;
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color: #527bbd;
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}
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p.tableblock {
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margin-top: 0;
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}
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table.tableblock {
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border-width: 3px;
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border-spacing: 0px;
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border-style: solid;
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border-color: #527bbd;
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border-collapse: collapse;
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}
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th.tableblock, td.tableblock {
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border-width: 1px;
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padding: 4px;
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border-style: solid;
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border-color: #527bbd;
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}
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table.tableblock.frame-topbot {
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border-left-style: hidden;
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border-right-style: hidden;
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}
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table.tableblock.frame-sides {
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border-top-style: hidden;
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border-bottom-style: hidden;
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}
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table.tableblock.frame-none {
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border-style: hidden;
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}
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th.tableblock.halign-left, td.tableblock.halign-left {
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text-align: left;
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}
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th.tableblock.halign-center, td.tableblock.halign-center {
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text-align: center;
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}
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th.tableblock.halign-right, td.tableblock.halign-right {
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text-align: right;
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}
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th.tableblock.valign-top, td.tableblock.valign-top {
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vertical-align: top;
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}
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th.tableblock.valign-middle, td.tableblock.valign-middle {
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vertical-align: middle;
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}
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th.tableblock.valign-bottom, td.tableblock.valign-bottom {
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vertical-align: bottom;
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}
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|
|
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|
/*
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* manpage specific
|
|
*
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* */
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|
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body.manpage h1 {
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padding-top: 0.5em;
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padding-bottom: 0.5em;
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border-top: 2px solid silver;
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border-bottom: 2px solid silver;
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}
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body.manpage h2 {
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border-style: none;
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}
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body.manpage div.sectionbody {
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margin-left: 3em;
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}
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|
|
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@media print {
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|
body.manpage div#toc { display: none; }
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}
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|
|
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@media screen {
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body {
|
|
max-width: 50em; /* approximately 80 characters wide */
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|
margin-left: 16em;
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}
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|
|
#toc {
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|
position: fixed;
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top: 0;
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left: 0;
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bottom: 0;
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|
width: 13em;
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padding: 0.5em;
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|
padding-bottom: 1.5em;
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|
margin: 0;
|
|
overflow: auto;
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|
border-right: 3px solid #f8f8f8;
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background-color: white;
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}
|
|
|
|
#toc .toclevel1 {
|
|
margin-top: 0.5em;
|
|
}
|
|
|
|
#toc .toclevel2 {
|
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margin-top: 0.25em;
|
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display: list-item;
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color: #aaaaaa;
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}
|
|
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#toctitle {
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margin-top: 0.5em;
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}
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}
|
|
</style>
|
|
<script type="text/javascript">
|
|
/*<+'])');
|
|
// Function that scans the DOM tree for header elements (the DOM2
|
|
// nodeIterator API would be a better technique but not supported by all
|
|
// browsers).
|
|
var iterate = function (el) {
|
|
for (var i = el.firstChild; i != null; i = i.nextSibling) {
|
|
if (i.nodeType == 1 /* Node.ELEMENT_NODE */) {
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|
var mo = re.exec(i.tagName);
|
|
if (mo && (i.getAttribute("class") || i.getAttribute("className")) != "float") {
|
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result[result.length] = new TocEntry(i, getText(i), mo[1]-1);
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}
|
|
iterate(i);
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|
}
|
|
}
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|
}
|
|
iterate(el);
|
|
return result;
|
|
}
|
|
|
|
var toc = document.getElementById("toc");
|
|
if (!toc) {
|
|
return;
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|
/*]]>*/
|
|
</script>
|
|
</head>
|
|
<body class="article">
|
|
<div id="header">
|
|
<h1>tpl Perl API</h1>
|
|
<span id="author">Troy D. Hanson</span><br />
|
|
<span id="email"><code><<a href="mailto:tdh@tkhanson.net">tdh@tkhanson.net</a>></code></span><br />
|
|
<span id="revnumber">version 1.1,</span>
|
|
<span id="revdate">April 2007</span>
|
|
<div id="toc">
|
|
<div id="toctitle">Table of Contents</div>
|
|
<noscript><p><b>JavaScript must be enabled in your browser to display the table of contents.</b></p></noscript>
|
|
</div>
|
|
</div>
|
|
<div id="content">
|
|
<div class="sect1">
|
|
<h2 id="_perl_api">Perl API</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph"><p>The Perl API for reading and writing tpl is nearly identical to the C API. This
|
|
document will briefly explain the Perl API and provide examples. The chief
|
|
motivation for having a Perl API is to communicate with C programs that use tpl.</p></div>
|
|
<div class="admonitionblock">
|
|
<table><tr>
|
|
<td class="icon">
|
|
<div class="title">Tip</div>
|
|
</td>
|
|
<td class="content">
|
|
<div class="title">Start with the C API</div>This document assumes familiarity with the C API. The concepts of using tpl
|
|
are not explained here. For an introduction to tpl and its C API, see the
|
|
<a href="userguide.html">User Guide</a>.</td>
|
|
</tr></table>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="_tpl_pm">Tpl.pm</h3>
|
|
<div class="paragraph"><p>The <code>Tpl.pm</code> file (in the <code>lang/perl</code>) directory contains the Perl module. You
|
|
can copy it to another directory if you wish. Your Perl program may need to
|
|
include a <code>use lib</code> statement to find the module.</p></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>#!/usr/bin/perl
|
|
use lib "/some/directory";
|
|
use Tpl;</code></pre>
|
|
</div></div>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="_tpl_map">tpl_map</h3>
|
|
<div class="paragraph"><p>This function resembles the C version, except that it’s invoked via the <code>Tpl</code>
|
|
module, and it takes references to Perl variables after the format string.</p></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>my $i;
|
|
my $tpl = Tpl->tpl_map("A(i)",\$i);</code></pre>
|
|
</div></div>
|
|
<div class="paragraph"><p>The return value is a tpl object; all other API calls are object methods.
|
|
Incidentally, there is no <code>tpl_free()</code> method corresponding to the C API.</p></div>
|
|
<div class="sect3">
|
|
<h4 id="_fixed_length_arrays">Fixed-length arrays</h4>
|
|
<div class="paragraph"><p>Format strings such as <code>i#</code> denote a fixed-length array. In the Perl API,
|
|
fixed-length arrays require two arguments: a list reference, and the fixed
|
|
length. For example:</p></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>my @x;
|
|
my $tpl = Tpl->tpl_map("i#", \@x, 10);</code></pre>
|
|
</div></div>
|
|
<div class="paragraph"><p>When fixed-length arrays are packed or unpacked, the specified number of
|
|
elements will be copied from (or placed into) the designated list.</p></div>
|
|
</div>
|
|
<div class="sect3">
|
|
<h4 id="_structures">Structures</h4>
|
|
<div class="paragraph"><p>Format strings containing <code>S(...)</code> are handled in the Perl API as if only the
|
|
interior, parenthesized part was present. (It does not work like the C API). So
|
|
simply ignore the <code>S(...)</code> and consider only its interior format characters when
|
|
constructing the argument list:</p></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>my ($str, $int);
|
|
my $tpl = Tpl->tpl_map("S(si)", \$str, \$int);</code></pre>
|
|
</div></div>
|
|
<div class="paragraph"><p>It really only makes sense to use <code>S(...)</code> in a format string in the Perl API if
|
|
you are communicating with a C program that uses structures.</p></div>
|
|
</div>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="_tpl_pack">tpl_pack</h3>
|
|
<div class="paragraph"><p>This is nearly identical to the C version. The only argument is the index
|
|
number to pack.</p></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>$tpl->tpl_pack(1);</code></pre>
|
|
</div></div>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="_tpl_dump">tpl_dump</h3>
|
|
<div class="paragraph"><p>This method is a little different than the C version. Given no arguments, it
|
|
returns the tpl image; given one argument it writes a file with that name.</p></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>$tpl->tpl_dump("demo.tpl"); # writes demo.tpl</code></pre>
|
|
</div></div>
|
|
<div class="paragraph"><p>Or,</p></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>my $img = $tpl->tpl_dump();</code></pre>
|
|
</div></div>
|
|
<div class="paragraph"><p>The tpl image is a binary buffer. You can do whatever you want with it, such as
|
|
write it to a socket or pipe (probably to C program listening on the other end),
|
|
or save it somewhere and later re-load it using <code>tpl_load()</code>.</p></div>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="_tpl_load">tpl_load</h3>
|
|
<div class="paragraph"><p>This method loads a tpl image from a file or from a Perl variable. It takes
|
|
one argument. If it’s not a reference, it’s assumed to be a filename to load.</p></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>$tpl->tpl_load("demo.tpl");</code></pre>
|
|
</div></div>
|
|
<div class="paragraph"><p>Otherwise, if the argument is a Perl reference, it’s construed as a variable
|
|
containing the tpl image:</p></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>$tpl->tpl_load(\$img);</code></pre>
|
|
</div></div>
|
|
<div class="paragraph"><p>The method will <code>die</code> if the image is invalid or the file doesn’t exist. You
|
|
can wrap it with <code>eval</code> to catch such errors:</p></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>eval { $tpl->tpl_load(\$img); };
|
|
print "failed to load\n" if $@;</code></pre>
|
|
</div></div>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="_tpl_unpack">tpl_unpack</h3>
|
|
<div class="paragraph"><p>This is nearly identical to the C version. The only argument is the index
|
|
number to unpack.</p></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>$tpl->tpl_unpack(1);</code></pre>
|
|
</div></div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_examples">Examples</h2>
|
|
<div class="sectionbody">
|
|
<div class="sect2">
|
|
<h3 id="_integer_array">Integer array</h3>
|
|
<div class="listingblock">
|
|
<div class="title">Packing A(i) to file</div>
|
|
<div class="content">
|
|
<pre><code>#!/usr/bin/perl
|
|
|
|
use strict;
|
|
use warnings;
|
|
|
|
use Tpl;
|
|
|
|
my $i;
|
|
my $tpl = Tpl->tpl_map("A(i)",\$i);
|
|
for($i=0; $i<10; $i++) {
|
|
$tpl->tpl_pack(1);
|
|
}
|
|
$tpl->tpl_dump("demo.tpl");</code></pre>
|
|
</div></div>
|
|
<div class="listingblock">
|
|
<div class="title">Unpacking A(i) from file</div>
|
|
<div class="content">
|
|
<pre><code>#!/usr/bin/perl
|
|
|
|
use strict;
|
|
use warnings;
|
|
|
|
use Tpl;
|
|
|
|
my $j;
|
|
my $tpl2 = Tpl->tpl_map("A(i)",\$j);
|
|
$tpl2->tpl_load("demo.tpl");
|
|
while($tpl2->tpl_unpack(1) > 0) {
|
|
print "$j\n";
|
|
}</code></pre>
|
|
</div></div>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="_message_passing">Message-passing</h3>
|
|
<div class="paragraph"><p>While the bulk of this example is socket handling, it demonstrates how you can
|
|
use tpl as a message-passing format. In the real-world, you might have a C
|
|
server and a Perl client, for example. In this example, we’ll code both a client
|
|
and a server in Perl.</p></div>
|
|
<div class="sidebarblock">
|
|
<div class="content">
|
|
<div class="title">A server that sums integers</div>
|
|
<div class="paragraph"><p>Programming literature is rife with contrived examples so we will follow in that
|
|
tradition. Our server will do no more than sum a list of integers. But in doing
|
|
so it will demonstrate message passing adequately. Both its input (the integer
|
|
array) and its output (an integer) are tpl images, passed over a TCP/IP socket.</p></div>
|
|
</div></div>
|
|
<div class="sect3">
|
|
<h4 id="_server">Server</h4>
|
|
<div class="paragraph"><p>The server waits for a connection from a client. When it gets one, it accepts
|
|
the connection and immediately forks a child process to handle it. Then it goes
|
|
back to waiting for another new connection.</p></div>
|
|
<div class="paragraph"><p>The server child process handles the client by loading and unpacking the tpl
|
|
image sent by the client (containing an array of integers). It calculates their
|
|
sum and constructs a new tpl image containing the sum, which it sends back to
|
|
the client.</p></div>
|
|
<div class="listingblock">
|
|
<div class="title">Server</div>
|
|
<div class="content">
|
|
<pre><code>#!/usr/bin/perl
|
|
|
|
use strict;
|
|
use warnings;
|
|
|
|
use IO::Socket::INET;
|
|
use Tpl;
|
|
|
|
$SIG{CHLD} = "IGNORE"; # don't create zombies
|
|
|
|
our $port = 2000;
|
|
|
|
sub handle_client {
|
|
my $client = shift;
|
|
|
|
undef $/;
|
|
my $request = <$client>; # get request (slurp)
|
|
|
|
# read input array, and calculate total
|
|
my ($i,$total);
|
|
my $tpl = Tpl->tpl_map("A(i)", \$i);
|
|
eval { $tpl->tpl_load(\$request); };
|
|
die "received invalid tpl" if $@;
|
|
$total += $i while $tpl->tpl_unpack(1) > 0;
|
|
|
|
# formulate response and send
|
|
my $tpl2 = Tpl->tpl_map("i", \$total);
|
|
$tpl2->tpl_pack(0);
|
|
my $response = $tpl2->tpl_dump();
|
|
print $client $response;
|
|
close $client;
|
|
}
|
|
|
|
my $server = IO::Socket::INET->new(LocalPort => $port,
|
|
Type => SOCK_STREAM,
|
|
Reuse => 1,
|
|
Listen => 10 )
|
|
or die "Can't listen on port $port: $!\n";
|
|
|
|
while (1) {
|
|
my $client = $server->accept();
|
|
next unless $client;
|
|
# new connection
|
|
my $pid = fork;
|
|
die "can't fork: $!\n" unless defined $pid;
|
|
if ($pid > 0) {
|
|
# parent
|
|
close $client;
|
|
} elsif ($pid == 0) {
|
|
# child
|
|
handle_client($client);
|
|
exit(0);
|
|
}
|
|
}
|
|
close ($server);</code></pre>
|
|
</div></div>
|
|
</div>
|
|
<div class="sect3">
|
|
<h4 id="_client">Client</h4>
|
|
<div class="paragraph"><p>The client is a simpler program. It constructs the tpl image containing the
|
|
integer array (taken from its command-line arguments), connects to the server
|
|
and sends the tpl image to it, and then awaits the response tpl. The response
|
|
containing the sum is loaded, unpacked and printed.</p></div>
|
|
<div class="listingblock">
|
|
<div class="title">Client</div>
|
|
<div class="content">
|
|
<pre><code>#!/usr/bin/perl
|
|
|
|
use strict;
|
|
use warnings;
|
|
|
|
use IO::Socket::INET;
|
|
use Tpl;
|
|
|
|
our $port = 2000;
|
|
|
|
# construct tpl
|
|
my $i;
|
|
my $tpl = Tpl->tpl_map("A(i)",\$i);
|
|
$tpl->tpl_pack(1) while ($i=shift @ARGV);
|
|
my $request = $tpl->tpl_dump();
|
|
|
|
# send to server, get response
|
|
my $socket = IO::Socket::INET->new("localhost:$port") or die "can't connect";
|
|
print $socket $request;
|
|
shutdown($socket,1); # done writing (half-close)
|
|
undef $/;
|
|
my $response = <$socket>; # get reply (slurp)
|
|
|
|
# decode response (or print error)
|
|
my $total;
|
|
my $tpl2 = Tpl->tpl_map("i", \$total);
|
|
eval { $tpl2->tpl_load(\$response); };
|
|
die "invalid response\n" if $@;
|
|
$tpl2->tpl_unpack(0);
|
|
print "total is $total\n";</code></pre>
|
|
</div></div>
|
|
</div>
|
|
<div class="sect3">
|
|
<h4 id="_running_thise_example">Running thise example</h4>
|
|
<div class="paragraph"><p>If the client and server programs are in <code>client.pl</code> and <code>server.pl</code>, then
|
|
you can run the example by starting the server in one window:</p></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>./server.pl</code></pre>
|
|
</div></div>
|
|
<div class="paragraph"><p>Then run the client in another window. E.g.,</p></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>./client.pl 1 2 3 4 5</code></pre>
|
|
</div></div>
|
|
<div class="paragraph"><p>The client runs and then exits, printing:</p></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>total is 15</code></pre>
|
|
</div></div>
|
|
<div class="paragraph"><p>You can re-run the client with different arguments. When done, type <code>Ctrl-C</code> in
|
|
the server window to terminate it.</p></div>
|
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</div>
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<div id="footnotes"><hr /></div>
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Version 1.1<br />
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Last updated 2013-03-12 17:20:17 EDT
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