Revamp send/receive and test it.

Follow ltree's example by prepending a version and using the pg_msg functions. Add tests. A little hinky to use `\copy` to write to a file and then read it back in, but it is the only way I could figure out to test the receive function, which binary COPY FROM uses. Increment to v0.32.0, update the copyright date, and test on Postgres 15.
theory · Oct 18, 2022 · e30b8b0 · e30b8b0
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diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
@@ -9,7 +9,7 @@ jobs:
   build:
     strategy:
       matrix:
-        pg: [14, 13, 12, 11, 10, 9.6, 9.5, 9.4, 9.3, 9.2]
+        pg: [15, 14, 13, 12, 11, 10, 9.6, 9.5, 9.4, 9.3, 9.2]
     name: 🐘 PostgreSQL ${{ matrix.pg }}
     runs-on: ubuntu-latest
     container: pgxn/pgxn-tools

diff --git a/.gitignore b/.gitignore
@@ -8,3 +8,5 @@ regression.out
 /semver-*
 /latest-changes.md
 /src/*.bc
+/semver_binary_copy.bin
+/.vscode
diff --git a/Changes b/Changes
@@ -1,6 +1,8 @@
 Revision history for PostgreSQL extension semver.
 
-0.31.3
+0.32.0
+      - Add support for binary input (receive) and output (send) functions.
+        Thanks to Anna Clemens for the pull request (#61)!
 
 0.31.2  2021-09-28T02:03:35Z
       - Add an overflow check and properly compare the max size of INT32

diff --git a/LICENSE b/LICENSE
@@ -1,4 +1,4 @@
-Copyright (c) 2010-2021 The pg-semver Maintainers: David E. Wheeler, Sam
+Copyright (c) 2010-2022 The pg-semver Maintainers: David E. Wheeler, Sam
 Vilain, Tom Davis, and Xavier Caron.
 
 This module is free software; you can redistribute it and/or modify it under

diff --git a/META.json b/META.json
@@ -2,7 +2,7 @@
    "name": "semver",
    "abstract": "A semantic version data type",
    "description": "A Postgres data type for the Semantic Version format with support for btree and hash indexing.",
-   "version": "0.31.2",
+   "version": "0.32.0",
    "maintainer": [
       "David E. Wheeler <[email protected]>",
       "Sam Vilain <[email protected]>",
@@ -15,7 +15,7 @@
          "abstract": "A semantic version data type",
          "file": "sql/semver.sql",
          "docfile": "doc/semver.mmd",
-         "version": "0.31.2"
+         "version": "0.32.0"
       }
    },
    "prereqs": {

diff --git a/README.md b/README.md
@@ -1,4 +1,4 @@
-semver 0.31.2
+semver 0.32.0
 =============
 
 [![PGXN version](https://badge.fury.io/pg/semver.svg)](https://badge.fury.io/pg/semver)
@@ -78,7 +78,7 @@ for testing, PL/pgSQL.
 Copyright and License
 ---------------------
 
-Copyright (c) 2010-2021 The pg-semver Maintainers: David E. Wheeler, Sam
+Copyright (c) 2010-2022 The pg-semver Maintainers: David E. Wheeler, Sam
 Vilain, Tom Davis, and Xavier Caron.
 
 This module is free software; you can redistribute it and/or modify it under

diff --git a/doc/semver.mmd b/doc/semver.mmd
@@ -1,4 +1,4 @@
-semver 0.31.2
+semver 0.32.0
 =============
 
 Synopsis
@@ -342,7 +342,7 @@ Authors
 Copyright and License
 ---------------------
 
-Copyright (c) 2010-2021 The pg-semver Maintainers: David E. Wheeler, Sam
+Copyright (c) 2010-2022 The pg-semver Maintainers: David E. Wheeler, Sam
 Vilain, Tom Davis, and Xavier Caron.
 
 This module is free software; you can redistribute it and/or modify it under

diff --git a/semver.control b/semver.control
@@ -1,5 +1,5 @@
 # semver extension
 comment = 'Semantic version data type'
-default_version = '0.31.2'
+default_version = '0.32.0'
 module_pathname = '$libdir/semver'
 relocatable = true
diff --git a/sql/semver--0.31.2--0.32.0.sql b/sql/semver--0.31.2--0.32.0.sql
@@ -0,0 +1,13 @@
+CREATE OR REPLACE FUNCTION semver_recv(internal)
+    RETURNS semver
+    AS 'semver'
+    LANGUAGE C STRICT IMMUTABLE;
+
+CREATE OR REPLACE FUNCTION semver_send(semver)
+    RETURNS bytea
+    AS 'semver'
+    LANGUAGE C STRICT IMMUTABLE;
+
+ALTER TYPE semver SET
+	RECEIVE = semver_recv,
+	SEND = semver_send;
diff --git a/src/semver.c b/src/semver.c
@@ -6,7 +6,7 @@
  * + Tom Davis <[email protected]>
  * + Xavier Caron <[email protected]>
  *
- * Copyright 2010-2021 The pg-semver Maintainers. This program is Free
+ * Copyright 2010-2022 The pg-semver Maintainers. This program is Free
  * Software; see the LICENSE file for the license conditions.
  */
 
@@ -343,42 +343,58 @@ semver_out(PG_FUNCTION_ARGS) {
     PG_RETURN_CSTRING(result);
 }
 
-PG_FUNCTION_INFO_V1(semver_recv);
+/*
+ * semver type send function
+ *
+ * The type is sent as text in binary mode, so this is almost the same as the
+ * output function, but it's prefixed with a version number so we can change the
+ * binary format sent in future if necessary. For now, only version 1 is
+ * supported.
+ */
+PG_FUNCTION_INFO_V1(semver_send);
 Datum
-semver_recv(PG_FUNCTION_ARGS) {
-    StringInfo buf = (StringInfo) PG_GETARG_POINTER(0);
-    const int len = buf->len - buf->cursor;
-    char* str = palloc(len + 1);
-    bool bad = false;
-    semver* result;
-
-    pq_copymsgbytes(buf, str, len);
-    str[len] = 0;
-
-    result = parse_semver(str, false, true, &bad);
+semver_send(PG_FUNCTION_ARGS) {
+    semver *result = PG_GETARG_SEMVER_P(0);
+    char   *str = emit_semver(result);
+    char    version = 1;
+
+    StringInfoData buf;
+    pq_begintypsend(&buf);
+    pq_sendbyte(&buf, version);
+    pq_sendtext(&buf, str, strlen(str));
     pfree(str);
-    if (!result) PG_RETURN_NULL();
 
-    PG_RETURN_POINTER(result);
+    PG_RETURN_BYTEA_P(pq_endtypsend(&buf));
 }
 
-PG_FUNCTION_INFO_V1(semver_send);
+/*
+ * semver type recv function
+ *
+ * The type is sent as text in binary mode, so this is almost the same as the
+ * input function, but it's prefixed with a version number so we can change the
+ * binary format sent in future if necessary. For now, only version 1 is
+ * supported.
+ */
+PG_FUNCTION_INFO_V1(semver_recv);
 Datum
-semver_send(PG_FUNCTION_ARGS) {
-    bytea* output;
-
-    semver* version = PG_GETARG_SEMVER_P(0);
-    char* str = emit_semver(version);
-    int len = strlen(str);
-
-    output = palloc(VARHDRSZ + len);
-
-    memcpy(VARDATA(output), str, len);
-    SET_VARSIZE(output, VARHDRSZ + len);
+semver_recv(PG_FUNCTION_ARGS) {
+    StringInfo  buf = (StringInfo) PG_GETARG_POINTER(0);
+    char        version = pq_getmsgbyte(buf);
+    char       *str;
+    int         nbytes;
+    bool        bad = false;
+    semver     *result;
+
+    if (version != 1) {
+        elog(ERROR, "unsupported semver type version number %d", version);
+    }
 
+    str = pq_getmsgtext(buf, buf->len - buf->cursor, &nbytes);
+    result = parse_semver(str, false, true, &bad);
     pfree(str);
 
-    PG_RETURN_BYTEA_P(output);
+    if (!result) PG_RETURN_NULL();
+    PG_RETURN_POINTER(result);
 }
 
 PG_FUNCTION_INFO_V1(text_to_semver);

diff --git a/test/expected/base.out b/test/expected/base.out
@@ -1,5 +1,5 @@
 \set ECHO none
-1..312
+1..334
 ok 1 - Type semver should exist
 ok 2 - semvers should be NULLable
 ok 3 - "1.2.2" is a valid semver
@@ -312,3 +312,25 @@ ok 309 - Should properly format a 32 character semver
 ok 310 - Should properly format a 33 character semver
 ok 311 - Should propery format a prerelease with a hyphen
 ok 312 - Should get distinct values via hash aggregation
+ok 313 - Function semver_send() should exist
+ok 314 - Function semver_send(semver) should exist
+ok 315 - Function semver_send() should return bytea
+ok 316 - Function semver_recv() should exist
+ok 317 - Function semver_recv(internal) should exist
+ok 318 - Function semver_recv() should return semver
+ok 319 - semver_send('0.9.9-a1.1+1234')
+ok 320 - semver_send('0.9.9-a1.2.3')
+ok 321 - semver_send('0.9.9-a1.2')
+ok 322 - semver_send('0.9.9')
+ok 323 - semver_send('1.0.0+99')
+ok 324 - semver_send('1.0.0-1')
+ok 325 - semver_send('1.2.2')
+ok 326 - semver_send('9999.9999999.823823')
+ok 327 - semver_send('1.0.0-beta1')
+ok 328 - semver_send('1.0.0-1')
+ok 329 - semver_send('1.0.0-alpha+d34dm34t')
+ok 330 - semver_send('1.0.0+d34dm34t')
+ok 331 - semver_send('20110204.0.0')
+ok 332 - semver_send('1.0.0-0AEF')
+ok 333 - semver_send(NULL)
+ok 334 - Should have binary copied all of the semvers
diff --git a/test/sql/base.sql b/test/sql/base.sql
@@ -4,7 +4,7 @@ BEGIN;
 \i test/pgtap-core.sql
 \i sql/semver.sql
 
-SELECT plan(312);
+SELECT plan(334);
 --SELECT * FROM no_plan();
 
 SELECT has_type('semver');
@@ -514,5 +514,43 @@ SELECT bag_eq(
     'Should get distinct values via hash aggregation'
 );
 
+-- Test send and receive.
+SELECT has_function('semver_send');
+SELECT has_function('semver_send', ARRAY['semver']);
+SELECT function_returns('semver_send', 'bytea');
+SELECT has_function('semver_recv');
+SELECT has_function('semver_recv', ARRAY['internal']);
+SELECT function_returns('semver_recv', 'semver');
+
+-- Set up some values to copy.
+INSERT INTO vs VALUES
+    ('1.2.2'::semver),
+    ('9999.9999999.823823'),
+    ('1.0.0-beta1'),
+    ('1.0.0-1'),
+    ('1.0.0-alpha+d34dm34t'),
+    ('1.0.0+d34dm34t'),
+    ('20110204.0.0'),
+    ('1.0.0-0AEF'),
+    (NULL)
+;
+
+-- Test semver_send().
+SELECT is(
+    semver_send(version), '\x01' || version::bytea,
+    'semver_send(' || COALESCE(quote_literal(version::text), 'NULL') || ')'
+) FROM vs;
+
+-- Cannot test semver_recv() directly, so instead copy to a file and back into
+-- another table.
+CREATE TABLE vs_recv(version semver);
+\copy vs TO semver_binary_copy.bin WITH BINARY;
+\copy vs_recv from semver_binary_copy.bin with binary;
+SELECT bag_eq(
+    'SELECT * FROM vs',
+    'SELECT * FROM vs_recv',
+    'Should have binary copied all of the semvers'
+);
+
 SELECT * FROM finish();
 ROLLBACK;