views.c

/*
  +----------------------------------------------------------------------+
  | PHP Version 5                                                        |
  +----------------------------------------------------------------------+
  | Copyright 2012 Couchbase, Inc.                                       |
  +----------------------------------------------------------------------+
  | Licensed under the Apache License, Version 2.0 (the "License");      |
  | you may not use this file except in compliance with the License.     |
  | You may obtain a copy of the License at                              |
  |     http://www.apache.org/licenses/LICENSE-2.0                       |
  | Unless required by applicable law or agreed to in writing, software  |
  | distributed under the License is distributed on an "AS IS" BASIS,    |
  | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or      |
  | implied. See the License for the specific language governing         |
  | permissions and limitations under the License.                       |
  +----------------------------------------------------------------------+
*/

#include "internal.h"
#include "views.h"

/* {{{ static void php_couchbase_complete_callback(...)
*/

/* append a string literal to a smart_str */
#define APPEND_URI_s(u, s) \
	smart_str_appendl(u, s, sizeof(s)-1)

typedef struct _php_couchbase_htinfo {
	int htstatus;
	size_t ndata;
	char data[1];
} php_couchbase_htinfo;


static void php_couchbase_complete_callback(lcb_http_request_t request,
											lcb_t instance,
											const void *cookie,
											lcb_error_t error,
											const lcb_http_resp_t *resp)
{
	php_couchbase_ctx *ctx = (php_couchbase_ctx *)cookie;
	php_couchbase_htinfo *hti;

	pcbc_stop_loop(ctx->res);

	if (resp->version != 0) {
		ctx->extended_value = NULL;
		ctx->res->rc = LCB_ERROR;
		return;
	}

	/** We have one extra byte in 'data' */
	hti = emalloc(sizeof(*hti) + resp->v.v0.nbytes);
	hti->ndata = resp->v.v0.nbytes;

	if (hti->ndata) {
		memcpy(hti->data, resp->v.v0.bytes, hti->ndata);
	}

	hti->data[hti->ndata] = '\0';

	ctx->res->rc = error;
	ctx->extended_value = hti;

	hti->htstatus = resp->v.v0.status;
}

static int append_view_option(php_couchbase_res *res,
							  smart_str *uri,
							  const char *vopt, int nvopt, zval *input TSRMLS_DC)
{
	view_param *curvp = NULL;
	pcbc_sso_buf sso = { 0 };
	int status;
	char *error;

	if (res->viewopts_passthrough == 0) {
		curvp = pcbc_find_view_param(vopt, nvopt);
		if (!curvp) {
			php_error_docref(NULL TSRMLS_CC, E_WARNING,
							 "Unrecognized view option '%*s'", nvopt, vopt);
			return -1;
		}

		status = curvp->handler(curvp, input, &sso, &error TSRMLS_CC);
		if (status == -1) {
			php_error_docref(NULL TSRMLS_CC, E_WARNING,
							 "Problem with value for parameter '%*s': %s",
							 nvopt, vopt, error);
			return -1;
		}

	} else {
		pcbc_vopt_generic_param_handler(NULL,
										input, &sso, &error TSRMLS_CC);
	}

	/**
	 * Otherwise, we have a string we can append..
	 */
	smart_str_appendl(uri, vopt, nvopt);
	smart_str_appendc(uri, '=');
	smart_str_appendl(uri, sso.str, sso.len);
	smart_str_appendc(uri, '&');

	pcbc_sso_buf_cleanup(&sso);

	return 0;
}

/* }}} */


static void extract_view_options(php_couchbase_res *couchbase_res,
								 zval *options,
								 smart_str *uri TSRMLS_DC)
{
	smart_str_appendc(uri, '?');

	for (
		zend_hash_internal_pointer_reset(Z_ARRVAL_P(options));
		zend_hash_has_more_elements(Z_ARRVAL_P(options)) == SUCCESS;
		zend_hash_move_forward(Z_ARRVAL_P(options))) {

		char *key;
		uint klen;
		ulong idx;
		int type;
		zval **ppzval;

		type = zend_hash_get_current_key_ex(Z_ARRVAL_P(options),
											&key, &klen, &idx, 0, NULL);

		if (type != HASH_KEY_IS_STRING || klen == 0) {
			php_error_docref(NULL TSRMLS_CC, E_ERROR,
							 "Got non- (or empty) string value "
							 "for view parameters (%d)",
							 type);
			continue;
		}

		if (FAILURE ==
				zend_hash_get_current_data(
					Z_ARRVAL_P(options), (void **)&ppzval)) {

			php_error_docref(NULL TSRMLS_CC, E_ERROR,
							 "Couldn't get value for %*s", klen, key);
			continue;
		}

		/* Yes! The length *includes* the NUL byte */
		append_view_option(couchbase_res, uri, key, klen - 1, *ppzval TSRMLS_CC);
	}

	/* trim the last '&' from the uri */
	if (uri->c[uri->len - 1] == '&') {
		uri->len--;
	}
}

static void php_couchbase_sanitize_path(smart_str *uri,
										char *doc_name, long doc_name_len,
										char *view_name, long view_name_len)
{
	if (strcmp(doc_name, "_all_docs") == 0) {
		/* special case of _all_docs, which does not have its own design doc */
		APPEND_URI_s(uri, "_all_docs");

	} else if (view_name_len == 0) {
		/* i.e. we only have a single argument */
		smart_str_appendl(uri, doc_name, doc_name_len);

	} else {
		/* both design and doc. this is 'proper' usage */
		APPEND_URI_s(uri, "_design/");
		smart_str_appendl(uri, doc_name, doc_name_len);

		APPEND_URI_s(uri, "/_view/");
		smart_str_appendl(uri, view_name, view_name_len);
	}
}

/**
 * Extract errors from the view response and make it into a nice message.
 * If we have an error and reason field, return those. Otherwise return the
 * HTTP content string
 */
static char *php_couchbase_view_convert_to_error(zval *decoded,
												 php_couchbase_htinfo *hti)
{
	char *err = NULL, *reason = NULL;
	char *ret = NULL;

	zval **zverr = NULL, **zvreason = NULL;
	int nerr = 0, nreason = 0;

	if (IS_ARRAY == Z_TYPE_P(decoded)) {

		zend_hash_find(Z_ARRVAL_P(decoded),
					   "error", sizeof("error"),
					   (void **)&zverr);

		zend_hash_find(Z_ARRVAL_P(decoded),
					   "reason", sizeof("reason"),
					   (void **)&zvreason);
	}

	if (zverr == NULL && zvreason == NULL) {
		spprintf(&ret, 2048, "[%d, %*s]",
				 hti->htstatus, (int)hti->ndata, hti->data);

		return ret;
	}

	if (!zverr) {
		err = "Unknown Error";
		nerr = strlen(err);

	} else {
		err = Z_STRVAL_PP(zverr);
		nerr = Z_STRLEN_PP(zverr);
	}

	if (!zvreason) {
		reason = "Unknown reason";
		nreason = strlen(reason);

	} else {
		reason = Z_STRVAL_PP(zvreason);
		nreason = Z_STRLEN_PP(zvreason);
	}

	spprintf(&ret, 2048, "[%d, %*s, %*s]",
			 hti->htstatus,
			 (int)nerr, err, (int)nreason, reason);
	return ret;
}

struct tc_cookie {
	lcb_t instance;
	lcb_http_request_t request;
};

void timer_callback(lcb_timer_t timer, lcb_t instance, const void *cookie)
{
	struct tc_cookie *tc = (struct tc_cookie *)cookie;
	lcb_cancel_http_request(tc->instance, tc->request);
}

PHP_COUCHBASE_LOCAL
void php_couchbase_view_impl(INTERNAL_FUNCTION_PARAMETERS, int oo, int uri_only) /* {{{ */
{
	zval *options = NULL;
	char *doc_name = NULL, *view_name = NULL;
	long doc_name_len = 0, view_name_len = 0;
	zend_bool return_errors = 0;
	lcb_error_t retval;
	smart_str uri = {0};
	php_couchbase_res *couchbase_res;
	php_couchbase_ctx ctx = {0};
	lcb_http_cmd_t cmd = {0};
	lcb_timer_t timer;
	struct tc_cookie tcc;
	long view_timeout = INI_INT(PCBC_INIENT_VIEW_TIMEOUT);

	int argflags = oo ? PHP_COUCHBASE_ARG_F_OO : PHP_COUCHBASE_ARG_F_FUNCTIONAL;

	PHP_COUCHBASE_GET_PARAMS(couchbase_res, argflags, "s|sab",
							 &doc_name, &doc_name_len,
							 &view_name, &view_name_len,
							 &options, &return_errors);

	APPEND_URI_s(&uri, "/");

	php_couchbase_sanitize_path(&uri, doc_name, doc_name_len,
								view_name, view_name_len);

	if (options && memchr(uri.c, '?', uri.len) == NULL) {
		extract_view_options(couchbase_res, options, &uri TSRMLS_CC);
	}

	if (uri_only) {
		/**
		 * Because PHP apparently has multiple personality disorder
		 * when it comes to the memory allocators it uses, we'll need
		 * to copy and free the buf
		 */
		ZVAL_STRINGL(return_value, uri.c, uri.len, 1);
		smart_str_free(&uri);
		return;
	}

	ctx.res = couchbase_res;

	memset(&cmd, 0, sizeof(cmd));
	cmd.v.v0.path = uri.c;
	cmd.v.v0.npath = uri.len;
	cmd.v.v0.method = LCB_HTTP_METHOD_GET;
	cmd.v.v0.content_type = "application/json";

	retval = lcb_make_http_request(couchbase_res->handle,
								   (const void *)&ctx,
								   LCB_HTTP_TYPE_VIEW,
								   &cmd, &tcc.request);
	smart_str_free(&uri);

	if (retval != LCB_SUCCESS) {
		couchbase_res->rc = retval;
		couchbase_report_error(INTERNAL_FUNCTION_PARAM_PASSTHRU, oo,
							   cb_lcb_exception,
							   "Failed to schedule couch request: %s",
							   lcb_strerror(couchbase_res->handle, retval));
		return ;
	}

	/* Setup a timer to monitor the progress of the view request */
	tcc.instance = couchbase_res->handle;

	/* @todo: When we allow the user to specify connection_timeout
	 *        as a parameter, we should ensure that the timer
	 *        is set higher than that.
	 */

	/*
	 * The view timeout is specified in secs, libcouchbase timers
	 * operate in the usec range
	 */
	view_timeout *= 1000000;
	timer = lcb_timer_create(couchbase_res->handle, &tcc,
							 view_timeout, 0, timer_callback,
							 &retval);

	if (retval != LCB_SUCCESS) {
		couchbase_res->rc = retval;
		lcb_cancel_http_request(tcc.instance, tcc.request);
		couchbase_report_error(INTERNAL_FUNCTION_PARAM_PASSTHRU, oo,
							   cb_lcb_exception,
							   "Failed to setup timer to monitor view request: %s",
							   lcb_strerror(couchbase_res->handle, retval));
		return;
	}

	/* Run the view */
	pcbc_start_loop(couchbase_res);


	lcb_timer_destroy(couchbase_res->handle, timer);

	if (ctx.extended_value) {
		php_couchbase_htinfo *hti = ctx.extended_value;
		pcbc_json_decode(return_value, hti->data, hti->ndata, 1 TSRMLS_CC);

		if ((ctx.res->rc != LCB_SUCCESS || (hti->htstatus) / 100 != 2) && return_errors == 0) {
			char *errstr = php_couchbase_view_convert_to_error(return_value,
															   hti);
			zval_dtor(return_value);
			ZVAL_FALSE(return_value);

			couchbase_report_error(INTERNAL_FUNCTION_PARAM_PASSTHRU, oo,
								   cb_server_exception, "%s", errstr);
			efree(errstr);
		}
		efree(hti);
		return;
	} else {
		ZVAL_FALSE(return_value);
		couchbase_report_error(INTERNAL_FUNCTION_PARAM_PASSTHRU, oo,
							   cb_lcb_exception, "Failed to execute view: %s",
							   lcb_strerror(couchbase_res->handle,
											ctx.res->rc));
	}
}

#undef APPEND_URI_s

PHP_COUCHBASE_LOCAL
void php_couchbase_callbacks_view_init(lcb_t handle)
{
	lcb_set_http_complete_callback(handle, php_couchbase_complete_callback);
}

/* }}} */
/*
 * Local variables:
 * tab-width: 4
 * c-basic-offset: 4
 * End:
 * vim600: noet expandtab sw=4 ts=4 fdm=marker
 * vim<600: noet sw=4 ts=4
 */