TLA Line data Source code
1 : #include "postgres.h"
2 :
3 : #include "fmgr.h"
4 : #include "hstore/hstore.h"
5 : #include "plpy_typeio.h"
6 : #include "plpython.h"
7 :
8 CBC 1 : PG_MODULE_MAGIC;
9 :
10 : /* Linkage to functions in plpython module */
11 : typedef char *(*PLyObject_AsString_t) (PyObject *plrv);
12 : static PLyObject_AsString_t PLyObject_AsString_p;
13 : typedef PyObject *(*PLyUnicode_FromStringAndSize_t) (const char *s, Py_ssize_t size);
14 : static PLyUnicode_FromStringAndSize_t PLyUnicode_FromStringAndSize_p;
15 :
16 : /* Linkage to functions in hstore module */
17 : typedef HStore *(*hstoreUpgrade_t) (Datum orig);
18 : static hstoreUpgrade_t hstoreUpgrade_p;
19 : typedef int (*hstoreUniquePairs_t) (Pairs *a, int32 l, int32 *buflen);
20 : static hstoreUniquePairs_t hstoreUniquePairs_p;
21 : typedef HStore *(*hstorePairs_t) (Pairs *pairs, int32 pcount, int32 buflen);
22 : static hstorePairs_t hstorePairs_p;
23 : typedef size_t (*hstoreCheckKeyLen_t) (size_t len);
24 : static hstoreCheckKeyLen_t hstoreCheckKeyLen_p;
25 : typedef size_t (*hstoreCheckValLen_t) (size_t len);
26 : static hstoreCheckValLen_t hstoreCheckValLen_p;
27 :
28 :
29 : /*
30 : * Module initialize function: fetch function pointers for cross-module calls.
31 ECB : */
32 : void
33 GIC 1 : _PG_init(void)
34 : {
35 ECB : /* Asserts verify that typedefs above match original declarations */
36 : AssertVariableIsOfType(&PLyObject_AsString, PLyObject_AsString_t);
37 GIC 1 : PLyObject_AsString_p = (PLyObject_AsString_t)
38 1 : load_external_function("$libdir/" PLPYTHON_LIBNAME, "PLyObject_AsString",
39 ECB : true, NULL);
40 : AssertVariableIsOfType(&PLyUnicode_FromStringAndSize, PLyUnicode_FromStringAndSize_t);
41 GIC 1 : PLyUnicode_FromStringAndSize_p = (PLyUnicode_FromStringAndSize_t)
42 1 : load_external_function("$libdir/" PLPYTHON_LIBNAME, "PLyUnicode_FromStringAndSize",
43 ECB : true, NULL);
44 : AssertVariableIsOfType(&hstoreUpgrade, hstoreUpgrade_t);
45 GIC 1 : hstoreUpgrade_p = (hstoreUpgrade_t)
46 1 : load_external_function("$libdir/hstore", "hstoreUpgrade",
47 ECB : true, NULL);
48 : AssertVariableIsOfType(&hstoreUniquePairs, hstoreUniquePairs_t);
49 GIC 1 : hstoreUniquePairs_p = (hstoreUniquePairs_t)
50 1 : load_external_function("$libdir/hstore", "hstoreUniquePairs",
51 ECB : true, NULL);
52 : AssertVariableIsOfType(&hstorePairs, hstorePairs_t);
53 GIC 1 : hstorePairs_p = (hstorePairs_t)
54 1 : load_external_function("$libdir/hstore", "hstorePairs",
55 ECB : true, NULL);
56 : AssertVariableIsOfType(&hstoreCheckKeyLen, hstoreCheckKeyLen_t);
57 GIC 1 : hstoreCheckKeyLen_p = (hstoreCheckKeyLen_t)
58 1 : load_external_function("$libdir/hstore", "hstoreCheckKeyLen",
59 ECB : true, NULL);
60 : AssertVariableIsOfType(&hstoreCheckValLen, hstoreCheckValLen_t);
61 GIC 1 : hstoreCheckValLen_p = (hstoreCheckValLen_t)
62 CBC 1 : load_external_function("$libdir/hstore", "hstoreCheckValLen",
63 : true, NULL);
64 GIC 1 : }
65 :
66 :
67 : /* These defines must be after the module init function */
68 : #define PLyObject_AsString PLyObject_AsString_p
69 : #define PLyUnicode_FromStringAndSize PLyUnicode_FromStringAndSize_p
70 : #define hstoreUpgrade hstoreUpgrade_p
71 : #define hstoreUniquePairs hstoreUniquePairs_p
72 : #define hstorePairs hstorePairs_p
73 : #define hstoreCheckKeyLen hstoreCheckKeyLen_p
74 : #define hstoreCheckValLen hstoreCheckValLen_p
75 ECB :
76 :
77 GIC 2 : PG_FUNCTION_INFO_V1(hstore_to_plpython);
78 ECB :
79 : Datum
80 CBC 7 : hstore_to_plpython(PG_FUNCTION_ARGS)
81 : {
82 7 : HStore *in = PG_GETARG_HSTORE_P(0);
83 ECB : int i;
84 CBC 7 : int count = HS_COUNT(in);
85 GIC 7 : char *base = STRPTR(in);
86 7 : HEntry *entries = ARRPTR(in);
87 ECB : PyObject *dict;
88 :
89 GBC 7 : dict = PyDict_New();
90 GIC 7 : if (!dict)
91 UIC 0 : ereport(ERROR,
92 : (errcode(ERRCODE_OUT_OF_MEMORY),
93 ECB : errmsg("out of memory")));
94 :
95 GIC 20 : for (i = 0; i < count; i++)
96 : {
97 ECB : PyObject *key;
98 :
99 CBC 13 : key = PLyUnicode_FromStringAndSize(HSTORE_KEY(entries, base, i),
100 13 : HSTORE_KEYLEN(entries, i));
101 GIC 13 : if (HSTORE_VALISNULL(entries, i))
102 6 : PyDict_SetItem(dict, key, Py_None);
103 : else
104 : {
105 ECB : PyObject *value;
106 :
107 CBC 7 : value = PLyUnicode_FromStringAndSize(HSTORE_VAL(entries, base, i),
108 7 : HSTORE_VALLEN(entries, i));
109 GIC 7 : PyDict_SetItem(dict, key, value);
110 CBC 7 : Py_XDECREF(value);
111 : }
112 GIC 13 : Py_XDECREF(key);
113 ECB : }
114 :
115 GIC 7 : return PointerGetDatum(dict);
116 : }
117 ECB :
118 :
119 GIC 2 : PG_FUNCTION_INFO_V1(plpython_to_hstore);
120 ECB :
121 : Datum
122 GIC 7 : plpython_to_hstore(PG_FUNCTION_ARGS)
123 : {
124 : PyObject *dict;
125 : PyObject *volatile items;
126 : Py_ssize_t pcount;
127 ECB : HStore *volatile out;
128 :
129 GBC 7 : dict = (PyObject *) PG_GETARG_POINTER(0);
130 GIC 7 : if (!PyMapping_Check(dict))
131 UIC 0 : ereport(ERROR,
132 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
133 ECB : errmsg("not a Python mapping")));
134 :
135 GIC 7 : pcount = PyMapping_Size(dict);
136 CBC 7 : items = PyMapping_Items(dict);
137 :
138 GIC 7 : PG_TRY();
139 : {
140 : int32 buflen;
141 : Py_ssize_t i;
142 ECB : Pairs *pairs;
143 :
144 CBC 7 : pairs = palloc(pcount * sizeof(*pairs));
145 :
146 GIC 26 : for (i = 0; i < pcount; i++)
147 : {
148 : PyObject *tuple;
149 : PyObject *key;
150 ECB : PyObject *value;
151 :
152 CBC 19 : tuple = PyList_GetItem(items, i);
153 GIC 19 : key = PyTuple_GetItem(tuple, 0);
154 CBC 19 : value = PyTuple_GetItem(tuple, 1);
155 ECB :
156 CBC 19 : pairs[i].key = PLyObject_AsString(key);
157 GIC 19 : pairs[i].keylen = hstoreCheckKeyLen(strlen(pairs[i].key));
158 CBC 19 : pairs[i].needfree = true;
159 :
160 19 : if (value == Py_None)
161 ECB : {
162 CBC 6 : pairs[i].val = NULL;
163 GIC 6 : pairs[i].vallen = 0;
164 6 : pairs[i].isnull = true;
165 : }
166 ECB : else
167 : {
168 CBC 13 : pairs[i].val = PLyObject_AsString(value);
169 GIC 13 : pairs[i].vallen = hstoreCheckValLen(strlen(pairs[i].val));
170 13 : pairs[i].isnull = false;
171 : }
172 ECB : }
173 :
174 GIC 7 : pcount = hstoreUniquePairs(pairs, pcount, &buflen);
175 GBC 7 : out = hstorePairs(pairs, pcount, buflen);
176 : }
177 LBC 0 : PG_FINALLY();
178 : {
179 CBC 7 : Py_DECREF(items);
180 : }
181 7 : PG_END_TRY();
182 :
183 GIC 7 : PG_RETURN_POINTER(out);
184 : }
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