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http.c
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/***********************************************************************
*
* Project: PgSQL HTTP
* Purpose: Main file.
*
***********************************************************************
* Copyright 2015 Paul Ramsey <[email protected]>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
***********************************************************************/
/* Constants */
#define HTTP_VERSION "1.5.0"
#define HTTP_ENCODING "gzip"
#define CURL_MIN_VERSION 0x071400 /* 7.20.0 */
/* System */
#include <regex.h>
#include <string.h>
#include <stdlib.h>
#include <limits.h> /* INT_MAX */
#include <signal.h> /* SIGINT */
/* PostgreSQL */
#include <postgres.h>
#include <fmgr.h>
#include <funcapi.h>
#include <access/genam.h>
#include <access/htup.h>
#include <access/sysattr.h>
#include <catalog/namespace.h>
#include <catalog/pg_type.h>
#include <catalog/pg_extension.h>
#include <catalog/dependency.h>
#include <catalog/indexing.h>
#include <commands/extension.h>
#include <lib/stringinfo.h>
#include <mb/pg_wchar.h>
#include <nodes/pg_list.h>
#include <utils/array.h>
#include <utils/builtins.h>
#include <utils/catcache.h>
#include <utils/jsonb.h>
#include <utils/lsyscache.h>
#include <utils/syscache.h>
#include <utils/typcache.h>
#include <utils/fmgroids.h>
#include <utils/guc.h>
#if PG_VERSION_NUM >= 90300
# include <access/htup_details.h>
#endif
#if PG_VERSION_NUM >= 100000
# include <utils/varlena.h>
#endif
#if PG_VERSION_NUM >= 120000
# include <access/table.h>
#else
# define table_open(rel, lock) heap_open((rel), (lock))
# define table_close(rel, lock) heap_close((rel), (lock))
#endif
#if PG_VERSION_NUM < 110000
#define PG_GETARG_JSONB_P(x) DatumGetJsonb(PG_GETARG_DATUM(x))
#endif
/* CURL */
#include <curl/curl.h>
/* Set up PgSQL */
PG_MODULE_MAGIC;
/* HTTP request methods we support */
typedef enum {
HTTP_GET,
HTTP_POST,
HTTP_DELETE,
HTTP_PUT,
HTTP_HEAD,
HTTP_PATCH
} http_method;
/* Components (and postitions) of the http_request tuple type */
enum {
REQ_METHOD = 0,
REQ_URI = 1,
REQ_HEADERS = 2,
REQ_CONTENT_TYPE = 3,
REQ_CONTENT = 4
} http_request_type;
/* Components (and postitions) of the http_response tuple type */
enum {
RESP_STATUS = 0,
RESP_CONTENT_TYPE = 1,
RESP_HEADERS = 2,
RESP_CONTENT = 3
} http_response_type;
/* Components (and postitions) of the http_header tuple type */
enum {
HEADER_FIELD = 0,
HEADER_VALUE = 1
} http_header_type;
typedef enum {
CURLOPT_STRING,
CURLOPT_LONG
} http_curlopt_type;
/* CURLOPT string/enum value mapping */
typedef struct {
char *curlopt_str;
char *curlopt_val;
CURLoption curlopt;
http_curlopt_type curlopt_type;
bool superuser_only;
} http_curlopt;
/* CURLOPT values we allow user to set at run-time */
/* Be careful adding these, as they can be a security risk */
static http_curlopt settable_curlopts[] = {
{ "CURLOPT_CAINFO", NULL, CURLOPT_CAINFO, CURLOPT_STRING, false },
{ "CURLOPT_TIMEOUT", NULL, CURLOPT_TIMEOUT, CURLOPT_LONG, false },
{ "CURLOPT_TIMEOUT_MS", NULL, CURLOPT_TIMEOUT_MS, CURLOPT_LONG, false },
{ "CURLOPT_CONNECTTIMEOUT", NULL, CURLOPT_CONNECTTIMEOUT, CURLOPT_LONG, false },
{ "CURLOPT_USERAGENT", NULL, CURLOPT_USERAGENT, CURLOPT_STRING, false },
{ "CURLOPT_USERPWD", NULL, CURLOPT_USERPWD, CURLOPT_STRING, false },
{ "CURLOPT_IPRESOLVE", NULL, CURLOPT_IPRESOLVE, CURLOPT_LONG, false },
#if LIBCURL_VERSION_NUM >= 0x070903 /* 7.9.3 */
{ "CURLOPT_SSLCERTTYPE", NULL, CURLOPT_SSLCERTTYPE, CURLOPT_STRING, false },
#endif
#if LIBCURL_VERSION_NUM >= 0x070e01 /* 7.14.1 */
{ "CURLOPT_PROXY", NULL, CURLOPT_PROXY, CURLOPT_STRING, false },
{ "CURLOPT_PROXYPORT", NULL, CURLOPT_PROXYPORT, CURLOPT_LONG, false },
#endif
#if LIBCURL_VERSION_NUM >= 0x071301 /* 7.19.1 */
{ "CURLOPT_PROXYUSERNAME", NULL, CURLOPT_PROXYUSERNAME, CURLOPT_STRING, false },
{ "CURLOPT_PROXYPASSWORD", NULL, CURLOPT_PROXYPASSWORD, CURLOPT_STRING, false },
#endif
#if LIBCURL_VERSION_NUM >= 0x071504 /* 7.21.4 */
{ "CURLOPT_TLSAUTH_USERNAME", NULL, CURLOPT_TLSAUTH_USERNAME, CURLOPT_STRING, false },
{ "CURLOPT_TLSAUTH_PASSWORD", NULL, CURLOPT_TLSAUTH_PASSWORD, CURLOPT_STRING, false },
{ "CURLOPT_TLSAUTH_TYPE", NULL, CURLOPT_TLSAUTH_TYPE, CURLOPT_STRING, false },
#endif
#if LIBCURL_VERSION_NUM >= 0x071800 /* 7.24.0 */
{ "CURLOPT_DNS_SERVERS", NULL, CURLOPT_DNS_SERVERS, CURLOPT_STRING, false },
#endif
#if LIBCURL_VERSION_NUM >= 0x071900 /* 7.25.0 */
{ "CURLOPT_TCP_KEEPALIVE", NULL, CURLOPT_TCP_KEEPALIVE, CURLOPT_LONG, false },
{ "CURLOPT_TCP_KEEPIDLE", NULL, CURLOPT_TCP_KEEPIDLE, CURLOPT_LONG, false },
#endif
#if LIBCURL_VERSION_NUM >= 0x072500 /* 7.37.0 */
{ "CURLOPT_SSL_VERIFYHOST", NULL, CURLOPT_SSL_VERIFYHOST, CURLOPT_LONG, false },
{ "CURLOPT_SSL_VERIFYPEER", NULL, CURLOPT_SSL_VERIFYPEER, CURLOPT_LONG, false },
#endif
{ "CURLOPT_SSLCERT", NULL, CURLOPT_SSLCERT, CURLOPT_STRING, false },
{ "CURLOPT_SSLKEY", NULL, CURLOPT_SSLKEY, CURLOPT_STRING, false },
#if LIBCURL_VERSION_NUM >= 0x073400 /* 7.52.0 */
{ "CURLOPT_PRE_PROXY", NULL, CURLOPT_PRE_PROXY, CURLOPT_STRING, false },
{ "CURLOPT_PROXY_CAINFO", NULL, CURLOPT_PROXY_TLSAUTH_USERNAME, CURLOPT_STRING, false },
{ "CURLOPT_PROXY_TLSAUTH_USERNAME", NULL, CURLOPT_PROXY_TLSAUTH_USERNAME, CURLOPT_STRING, false },
{ "CURLOPT_PROXY_TLSAUTH_PASSWORD", NULL, CURLOPT_PROXY_TLSAUTH_PASSWORD, CURLOPT_STRING, false },
{ "CURLOPT_PROXY_TLSAUTH_TYPE", NULL, CURLOPT_PROXY_TLSAUTH_TYPE, CURLOPT_STRING, false },
#endif
{ NULL, NULL, 0, 0, false } /* Array null terminator */
};
/* Function signatures */
void _PG_init(void);
void _PG_fini(void);
static size_t http_writeback(void *contents, size_t size, size_t nmemb, void *userp);
static size_t http_readback(void *buffer, size_t size, size_t nitems, void *instream);
/* Global variables */
bool g_use_keepalive;
int g_timeout_msec;
CURL * g_http_handle = NULL;
List * g_curl_opts = NIL;
/*
* Interrupt support is dependent on CURLOPT_XFERINFOFUNCTION which is
* only available from 7.32.0 and up
*/
#if LIBCURL_VERSION_NUM >= 0x072700 /* 7.39.0 */
pqsigfunc pgsql_interrupt_handler = NULL;
int http_interrupt_requested = 0;
/*
* To support request interruption, we have libcurl run the progress meter
* callback frequently, and here we watch to see if PgSQL has flipped our
* global 'http_interrupt_requested' flag. If it has been flipped,
* the non-zero return value will cue libcurl to abort the transfer,
* leading to a CURLE_ABORTED_BY_CALLBACK return on the curl_easy_perform()
*/
static int
http_progress_callback(void *clientp, curl_off_t dltotal, curl_off_t dlnow, curl_off_t ultotal, curl_off_t ulnow)
{
#ifdef WIN32
if (UNBLOCKED_SIGNAL_QUEUE())
{
pgwin32_dispatch_queued_signals();
}
#endif
/* elog(DEBUG3, "http_interrupt_requested = %d", http_interrupt_requested); */
return http_interrupt_requested;
}
/*
* We register this callback with the PgSQL signal handler to
* capture SIGINT and set our local interupt flag so that
* libcurl will eventually notice that a cancel is requested
*/
static void
http_interrupt_handler(int sig)
{
/* Handle the signal here */
elog(DEBUG2, "http_interrupt_handler: sig=%d", sig);
http_interrupt_requested = sig;
pgsql_interrupt_handler(sig);
return;
}
#endif /* 7.39.0 */
#undef HTTP_MEM_CALLBACKS
#ifdef HTTP_MEM_CALLBACKS
static void *
http_calloc(size_t a, size_t b)
{
if (a>0 && b>0)
return palloc0(a*b);
else
return NULL;
}
static void
http_free(void *a)
{
if (a)
pfree(a);
}
static void *
http_realloc(void *a, size_t sz)
{
if (a && sz)
return repalloc(a, sz);
else if (sz)
return palloc(sz);
else
return a;
}
static void *
http_malloc(size_t sz)
{
return sz ? palloc(sz) : NULL;
}
#endif
/* Startup */
void _PG_init(void)
{
DefineCustomBoolVariable("http.keepalive",
"reuse existing connections with keepalive",
NULL,
&g_use_keepalive,
false,
PGC_USERSET,
GUC_NOT_IN_SAMPLE,
NULL,
NULL,
NULL);
DefineCustomIntVariable("http.timeout_msec",
"request completion timeout in milliseconds",
NULL,
&g_timeout_msec,
0,
0,
INT_MAX,
PGC_USERSET,
GUC_NOT_IN_SAMPLE | GUC_UNIT_MS,
NULL,
NULL,
NULL);
#ifdef HTTP_MEM_CALLBACKS
/* Use PgSQL memory management in Curl */
curl_global_init_mem(CURL_GLOBAL_ALL, http_malloc, http_free, http_realloc, pstrdup, http_calloc);
#else
/* Set up Curl! */
curl_global_init(CURL_GLOBAL_ALL);
#endif
#if LIBCURL_VERSION_NUM >= 0x072700 /* 7.39.0 */
/* Register our interrupt handler (http_handle_interrupt) */
/* and store the existing one so we can call it when we're */
/* through with our work */
pgsql_interrupt_handler = pqsignal(SIGINT, http_interrupt_handler);
http_interrupt_requested = 0;
#endif
}
/* Tear-down */
void _PG_fini(void)
{
#if LIBCURL_VERSION_NUM >= 0x072700
/* Re-register the original signal handler */
pqsignal(SIGINT, pgsql_interrupt_handler);
#endif
if (g_http_handle)
{
curl_easy_cleanup(g_http_handle);
g_http_handle = NULL;
}
curl_global_cleanup();
elog(NOTICE, "Goodbye from HTTP %s", HTTP_VERSION);
}
/**
* This function is passed into CURL as the CURLOPT_WRITEFUNCTION,
* this allows the return values to be held in memory, in our case in a string.
*/
static size_t
http_writeback(void *contents, size_t size, size_t nmemb, void *userp)
{
size_t realsize = size * nmemb;
StringInfo si = (StringInfo)userp;
appendBinaryStringInfo(si, (const char*)contents, (int)realsize);
return realsize;
}
/**
* This function is passed into CURL as the CURLOPT_READFUNCTION,
* this allows the PUT operation to read the data it needs. We
* pass a StringInfo as our input, and per the callback contract
* return the number of bytes read at each call.
*/
static size_t
http_readback(void *buffer, size_t size, size_t nitems, void *instream)
{
size_t reqsize = size * nitems;
StringInfo si = (StringInfo)instream;
size_t remaining = si->len - si->cursor;
size_t readsize = Min(reqsize, remaining);
memcpy(buffer, si->data + si->cursor, readsize);
si->cursor += readsize;
return readsize;
}
static void
http_error(CURLcode err, const char *error_buffer)
{
if ( strlen(error_buffer) > 0 )
ereport(ERROR, (errmsg("%s", error_buffer)));
else
ereport(ERROR, (errmsg("%s", curl_easy_strerror(err))));
}
/* Utility macro to try a setopt and catch an error */
#define CURL_SETOPT(handle, opt, value) do { \
err = curl_easy_setopt((handle), (opt), (value)); \
if ( err != CURLE_OK ) \
{ \
http_error(err, http_error_buffer); \
PG_RETURN_NULL(); \
} \
} while (0);
/**
* Convert a request type string into the appropriate enumeration value.
*/
static http_method
request_type(const char *method)
{
if ( strcasecmp(method, "GET") == 0 )
return HTTP_GET;
else if ( strcasecmp(method, "POST") == 0 )
return HTTP_POST;
else if ( strcasecmp(method, "PUT") == 0 )
return HTTP_PUT;
else if ( strcasecmp(method, "DELETE") == 0 )
return HTTP_DELETE;
else if ( strcasecmp(method, "HEAD") == 0 )
return HTTP_HEAD;
else if ( strcasecmp(method, "PATCH") == 0 )
return HTTP_PATCH;
else
return HTTP_GET;
}
/**
* Given a field name and value, output a http_header tuple.
*/
static Datum
header_tuple(TupleDesc header_tuple_desc, const char *field, const char *value)
{
HeapTuple header_tuple;
int ncolumns;
Datum *header_values;
bool *header_nulls;
/* Prepare our return object */
ncolumns = header_tuple_desc->natts;
header_values = palloc0(sizeof(Datum)*ncolumns);
header_nulls = palloc0(sizeof(bool)*ncolumns);
header_values[HEADER_FIELD] = CStringGetTextDatum(field);
header_nulls[HEADER_FIELD] = false;
header_values[HEADER_VALUE] = CStringGetTextDatum(value);
header_nulls[HEADER_VALUE] = false;
/* Build up a tuple from values/nulls lists */
header_tuple = heap_form_tuple(header_tuple_desc, header_values, header_nulls);
return HeapTupleGetDatum(header_tuple);
}
/**
* Our own implementation of strcasestr.
*/
static char *
http_strcasestr(const char *s, const char *find)
{
char c, sc;
size_t len;
if ((c = *find++) != 0)
{
c = tolower((unsigned char)c);
len = strlen(find);
do
{
do
{
if ((sc = *s++) == 0)
return (NULL);
}
while ((char)tolower((unsigned char)sc) != c);
}
while (strncasecmp(s, find, len) != 0);
s--;
}
return ((char *)s);
}
/**
* Quick and dirty, remove all \r from a StringInfo.
*/
static void
string_info_remove_cr(StringInfo si)
{
int i = 0, j = 0;
while ( si->data[i] )
{
if ( si->data[i] != '\r' )
si->data[j++] = si->data[i++];
else
i++;
}
si->data[j] = '\0';
si->len -= i-j;
return;
}
/**
* Add an array of http_header tuples into a Curl string list.
*/
static struct curl_slist *
header_array_to_slist(ArrayType *array, struct curl_slist *headers)
{
ArrayIterator iterator;
Datum value;
bool isnull;
#if PG_VERSION_NUM >= 90500
iterator = array_create_iterator(array, 0, NULL);
#else
iterator = array_create_iterator(array, 0);
#endif
while (array_iterate(iterator, &value, &isnull))
{
HeapTupleHeader rec;
HeapTupleData tuple;
Oid tup_type;
int32 tup_typmod, ncolumns;
TupleDesc tup_desc;
size_t tup_len;
Datum *values;
bool *nulls;
/* Skip null array items */
if ( isnull )
continue;
rec = DatumGetHeapTupleHeader(value);
tup_type = HeapTupleHeaderGetTypeId(rec);
tup_typmod = HeapTupleHeaderGetTypMod(rec);
tup_len = HeapTupleHeaderGetDatumLength(rec);
tup_desc = lookup_rowtype_tupdesc(tup_type, tup_typmod);
ncolumns = tup_desc->natts;
/* Prepare for values / nulls to hold the data */
values = (Datum *) palloc0(ncolumns * sizeof(Datum));
nulls = (bool *) palloc0(ncolumns * sizeof(bool));
/* Build a temporary HeapTuple control structure */
tuple.t_len = tup_len;
ItemPointerSetInvalid(&(tuple.t_self));
tuple.t_tableOid = InvalidOid;
tuple.t_data = rec;
/* Break down the tuple into values/nulls lists */
heap_deform_tuple(&tuple, tup_desc, values, nulls);
/* Convert the data into a header */
/* TODO: Ensure the header list is unique? Or leave that to the */
/* server to deal with. */
if ( ! nulls[HEADER_FIELD] )
{
size_t total_len = 0;
char *buffer = NULL;
char *header_val;
char *header_fld = TextDatumGetCString(values[HEADER_FIELD]);
/* Don't process "content-type" in the optional headers */
if ( strlen(header_fld) <= 0 || strncasecmp(header_fld, "Content-Type", 12) == 0 )
{
elog(NOTICE, "'Content-Type' is not supported as an optional header");
continue;
}
if ( nulls[HEADER_VALUE] )
header_val = pstrdup("");
else
header_val = TextDatumGetCString(values[HEADER_VALUE]);
total_len = strlen(header_val) + strlen(header_fld) + sizeof(char) + sizeof(": ");
buffer = palloc(total_len);
if (buffer)
{
snprintf(buffer, total_len, "%s: %s", header_fld, header_val);
elog(DEBUG2, "pgsql-http: optional request header '%s'", buffer);
headers = curl_slist_append(headers, buffer);
pfree(buffer);
}
else
{
elog(ERROR, "pgsql-http: palloc(%zu) failure", total_len);
}
pfree(header_fld);
pfree(header_val);
}
/* Free all the temporary structures */
ReleaseTupleDesc(tup_desc);
pfree(values);
pfree(nulls);
}
array_free_iterator(iterator);
return headers;
}
/**
* Look up the namespace the extension is installed in
*/
static Oid
get_extension_schema(Oid ext_oid)
{
Oid result;
SysScanDesc scandesc;
HeapTuple tuple;
ScanKeyData entry[1];
#if PG_VERSION_NUM >= 120000
Oid pg_extension_oid = Anum_pg_extension_oid;
#else
Oid pg_extension_oid = ObjectIdAttributeNumber;
#endif
Relation rel = table_open(ExtensionRelationId, AccessShareLock);
ScanKeyInit(&entry[0],
pg_extension_oid,
BTEqualStrategyNumber, F_OIDEQ,
ObjectIdGetDatum(ext_oid));
scandesc = systable_beginscan(rel, ExtensionOidIndexId, true,
NULL, 1, entry);
tuple = systable_getnext(scandesc);
/* We assume that there can be at most one matching tuple */
if (HeapTupleIsValid(tuple))
result = ((Form_pg_extension) GETSTRUCT(tuple))->extnamespace;
else
result = InvalidOid;
systable_endscan(scandesc);
table_close(rel, AccessShareLock);
return result;
}
/**
* Look up the tuple description for a extension-defined type,
* avoiding the pitfalls of using relations that are not part
* of the extension, but share the same name as the relation
* of interest.
*/
static TupleDesc
typname_get_tupledesc(const char *extname, const char *typname)
{
Oid extoid = get_extension_oid(extname, true);
Oid extschemaoid;
Oid typoid;
if ( ! OidIsValid(extoid) )
elog(ERROR, "could not lookup '%s' extension oid", extname);
extschemaoid = get_extension_schema(extoid);
#if PG_VERSION_NUM >= 120000
typoid = GetSysCacheOid2(TYPENAMENSP, Anum_pg_type_oid,
PointerGetDatum(typname),
ObjectIdGetDatum(extschemaoid));
#else
typoid = GetSysCacheOid2(TYPENAMENSP,
PointerGetDatum(typname),
ObjectIdGetDatum(extschemaoid));
#endif
if ( OidIsValid(typoid) )
{
// Oid typ_oid = get_typ_typrelid(rel_oid);
Oid relextoid = getExtensionOfObject(TypeRelationId, typoid);
if ( relextoid == extoid )
{
return TypeGetTupleDesc(typoid, NIL);
}
}
elog(ERROR, "could not lookup '%s' tuple desc", typname);
}
#define RVSZ 8192 /* Max length of header element */
/**
* Convert a string of headers separated by newlines/CRs into an
* array of http_header tuples.
*/
static ArrayType *
header_string_to_array(StringInfo si)
{
/* Array building */
size_t arr_nelems = 0;
size_t arr_elems_size = 8;
Datum *arr_elems = palloc0(arr_elems_size*sizeof(Datum));
Oid elem_type;
int16 elem_len;
bool elem_byval;
char elem_align;
/* Header handling */
TupleDesc header_tuple_desc = NULL;
/* Regex support */
const char *regex_pattern = "^([^ \t\r\n\v\f]+): ?([^ \t\r\n\v\f]+.*)$";
regex_t regex;
regmatch_t pmatch[3];
int reti;
char rv1[RVSZ];
char rv2[RVSZ];
/* Compile the regular expression */
reti = regcomp(®ex, regex_pattern, REG_ICASE | REG_EXTENDED | REG_NEWLINE );
if ( reti )
elog(ERROR, "Unable to compile regex pattern '%s'", regex_pattern);
/* Lookup the tuple defn */
header_tuple_desc = typname_get_tupledesc("http", "http_header");
/* Prepare array building metadata */
elem_type = header_tuple_desc->tdtypeid;
get_typlenbyvalalign(elem_type, &elem_len, &elem_byval, &elem_align);
/* Loop through string, matching regex pattern */
si->cursor = 0;
while ( ! regexec(®ex, si->data+si->cursor, 3, pmatch, 0) )
{
/* Read the regex match results */
int eo0 = pmatch[0].rm_eo;
int so1 = pmatch[1].rm_so;
int eo1 = pmatch[1].rm_eo;
int so2 = pmatch[2].rm_so;
int eo2 = pmatch[2].rm_eo;
/* Copy the matched portions out of the string */
memcpy(rv1, si->data+si->cursor+so1, Min(eo1-so1, RVSZ));
rv1[eo1-so1] = '\0';
memcpy(rv2, si->data+si->cursor+so2, Min(eo2-so2, RVSZ));
rv2[eo2-so2] = '\0';
/* Move forward for next match */
si->cursor += eo0;
/* Increase elements array size if necessary */
if ( arr_nelems >= arr_elems_size )
{
arr_elems_size *= 2;
arr_elems = repalloc(arr_elems, arr_elems_size*sizeof(Datum));
}
arr_elems[arr_nelems] = header_tuple(header_tuple_desc, rv1, rv2);
arr_nelems++;
}
regfree(®ex);
ReleaseTupleDesc(header_tuple_desc);
return construct_array(arr_elems, arr_nelems, elem_type, elem_len, elem_byval, elem_align);
}
/* Check/log version info */
static void
http_check_curl_version(const curl_version_info_data *version_info)
{
elog(DEBUG2, "pgsql-http: curl version %s", version_info->version);
elog(DEBUG2, "pgsql-http: curl version number 0x%x", version_info->version_num);
elog(DEBUG2, "pgsql-http: ssl version %s", version_info->ssl_version);
if ( version_info->version_num < CURL_MIN_VERSION )
{
elog(ERROR, "pgsql-http requires Curl version 0.7.20 or higher");
}
}
static bool
set_curlopt(CURL* handle, const http_curlopt *opt)
{
CURLcode err = CURLE_OK;
char http_error_buffer[CURL_ERROR_SIZE];
/* Argument is a string */
if (opt->curlopt_type == CURLOPT_STRING)
{
err = curl_easy_setopt(handle, opt->curlopt, opt->curlopt_val);
elog(DEBUG2, "pgsql-http: set '%s' to value '%s', return value = %d", opt->curlopt_str, opt->curlopt_val, err);
}
/* Argument is a long */
else if (opt->curlopt_type == CURLOPT_LONG)
{
long value_long = strtol(opt->curlopt_val, NULL, 10);
if ( errno == EINVAL || errno == ERANGE )
elog(ERROR, "invalid integer provided for '%s'", opt->curlopt_str);
err = curl_easy_setopt(handle, opt->curlopt, value_long);
elog(DEBUG2, "pgsql-http: set '%s' to value '%ld', return value = %d", opt->curlopt_str, value_long, err);
}
else
{
elog(ERROR, "invalid curlopt_type");
}
if ( err != CURLE_OK )
{
http_error(err, http_error_buffer);
return false;
}
return true;
}
/* Check/create the global CURL* handle */
static CURL *
http_get_handle()
{
http_curlopt opt;
CURL *handle = g_http_handle;
size_t i = 0;
/* Initialize the global handle if needed */
if (!handle)
{
handle = curl_easy_init();
}
/* Always reset because we're going to infull the user */
/* set options down below */
else
{
curl_easy_reset(handle);
}
/* Always want a default fast (1 second) connection timeout */
/* User can over-ride with http_set_curlopt() if they wish */
curl_easy_setopt(handle, CURLOPT_CONNECTTIMEOUT, 1);
curl_easy_setopt(handle, CURLOPT_TIMEOUT_MS, 5000);
/* Set the user agent. If not set, use PG_VERSION as default */
curl_easy_setopt(handle, CURLOPT_USERAGENT, PG_VERSION_STR);
if (!handle)
ereport(ERROR, (errmsg("Unable to initialize CURL")));
/* Bring in any options the user has set this session */
while (1)
{
opt = settable_curlopts[i++];
if (!opt.curlopt_str) break;
/* Option value is already set */
if (opt.curlopt_val)
set_curlopt(handle, &opt);
}
g_http_handle = handle;
return handle;
}
/**
* User-defined Curl option reset.
*/
Datum http_reset_curlopt(PG_FUNCTION_ARGS);
PG_FUNCTION_INFO_V1(http_reset_curlopt);
Datum http_reset_curlopt(PG_FUNCTION_ARGS)
{
size_t i = 0;
/* Set up global HTTP handle */
CURL * handle = http_get_handle();
curl_easy_reset(handle);
/* Clean out the settable_curlopts global cache */
while (1)
{
http_curlopt *opt = settable_curlopts + i++;
if (!opt->curlopt_str) break;
if (opt->curlopt_val) pfree(opt->curlopt_val);
opt->curlopt_val = NULL;
}
PG_RETURN_BOOL(true);
}
Datum http_list_curlopt(PG_FUNCTION_ARGS);
PG_FUNCTION_INFO_V1(http_list_curlopt);
Datum http_list_curlopt(PG_FUNCTION_ARGS)
{
struct list_state {
size_t i; /* read position */
};
MemoryContext oldcontext, newcontext;
FuncCallContext *funcctx;
struct list_state *state;
Datum vals[2];
bool nulls[2];
if (SRF_IS_FIRSTCALL())
{
funcctx = SRF_FIRSTCALL_INIT();
newcontext = funcctx->multi_call_memory_ctx;
oldcontext = MemoryContextSwitchTo(newcontext);
state = palloc0(sizeof(*state));
funcctx->user_fctx = state;
if(get_call_result_type(fcinfo, 0, &funcctx->tuple_desc) != TYPEFUNC_COMPOSITE)
ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("composite-returning function called in context that cannot accept a composite")));
BlessTupleDesc(funcctx->tuple_desc);
MemoryContextSwitchTo(oldcontext);
}
funcctx = SRF_PERCALL_SETUP();
state = funcctx->user_fctx;
while (1)
{
Datum result;
HeapTuple tuple;
text *option, *value;
http_curlopt *opt = settable_curlopts + state->i++;
if (!opt->curlopt_str)
break;
if (!opt->curlopt_val)
continue;
option = cstring_to_text(opt->curlopt_str);
value = cstring_to_text(opt->curlopt_val);
vals[0] = PointerGetDatum(option);
vals[1] = PointerGetDatum(value);
nulls[0] = nulls[1] = 0;
tuple = heap_form_tuple(funcctx->tuple_desc, vals, nulls);
result = HeapTupleGetDatum(tuple);
SRF_RETURN_NEXT(funcctx, result);
}
SRF_RETURN_DONE(funcctx);
}
/**
* User-defined Curl option handling.
*/
Datum http_set_curlopt(PG_FUNCTION_ARGS);
PG_FUNCTION_INFO_V1(http_set_curlopt);
Datum http_set_curlopt(PG_FUNCTION_ARGS)
{
size_t i = 0;
char *curlopt, *value;
text *curlopt_txt, *value_txt;
CURL *handle;
/* Version check */
http_check_curl_version(curl_version_info(CURLVERSION_NOW));
/* We cannot handle null arguments */
if ( PG_ARGISNULL(0) || PG_ARGISNULL(1) )
PG_RETURN_BOOL(false);
/* Set up global HTTP handle */
handle = http_get_handle();
/* Read arguments */
curlopt_txt = PG_GETARG_TEXT_P(0);
value_txt = PG_GETARG_TEXT_P(1);
curlopt = text_to_cstring(curlopt_txt);
value = text_to_cstring(value_txt);
while (1)
{
http_curlopt *opt = settable_curlopts + i++;
if (!opt->curlopt_str) break;
if (strcasecmp(opt->curlopt_str, curlopt) == 0)
{
if (opt->curlopt_val) pfree(opt->curlopt_val);
opt->curlopt_val = MemoryContextStrdup(CacheMemoryContext, value);
PG_RETURN_BOOL(set_curlopt(handle, opt));
}
}
elog(ERROR, "curl option '%s' is not available for run-time configuration", curlopt);
PG_RETURN_BOOL(false);
}
/**
* Master HTTP request function, takes in an http_request tuple and outputs
* an http_response tuple.
*/
Datum http_request(PG_FUNCTION_ARGS);
PG_FUNCTION_INFO_V1(http_request);
Datum http_request(PG_FUNCTION_ARGS)
{
/* Input */
HeapTupleHeader rec;
HeapTupleData tuple;
Oid tup_type;
int32 tup_typmod;
TupleDesc tup_desc;
int ncolumns;
Datum *values;
bool *nulls;
char *uri;
char *method_str;
http_method method;
/* Processing */
CURLcode err;
char http_error_buffer[CURL_ERROR_SIZE];
struct curl_slist *headers = NULL;
StringInfoData si_data;
StringInfoData si_headers;
StringInfoData si_read;