diff options
author | 2016-06-07 08:59:30 -0700 | |
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committer | 2016-06-07 08:59:30 -0700 | |
commit | 0cf4defa42dfd0e1f09ea3e1fae7c111a673244f (patch) | |
tree | 94bdb15572e0fab7f810cb529dd69ea095bdfabb /src/core/ext/census/resource.c | |
parent | 4eb67b47a0918f5633585cfc3335476139d37685 (diff) |
simplify base resource definition; misc comment updates
Diffstat (limited to 'src/core/ext/census/resource.c')
-rw-r--r-- | src/core/ext/census/resource.c | 142 |
1 files changed, 100 insertions, 42 deletions
diff --git a/src/core/ext/census/resource.c b/src/core/ext/census/resource.c index 632b899e41..0ca0db94ba 100644 --- a/src/core/ext/census/resource.c +++ b/src/core/ext/census/resource.c @@ -32,7 +32,6 @@ */ #include "resource.h" -#include "gen/census.pb.h" #include "third_party/nanopb/pb_decode.h" #include <grpc/census.h> @@ -43,13 +42,6 @@ #include <stdbool.h> #include <string.h> -// Internal representation of a resource. -typedef struct { - char *name; - // Pointer to raw protobuf used in resource definition. - uint8_t *raw_pb; -} resource; - // Protect local resource data structures. static gpr_mu resource_lock; @@ -65,7 +57,7 @@ static size_t n_resources = 0; // Number of defined resources static size_t n_defined_resources = 0; -void initialize_resources() { +void initialize_resources(void) { gpr_mu_init(&resource_lock); gpr_mu_lock(&resource_lock); GPR_ASSERT(resources == NULL && n_resources == 0 && n_defined_resources == 0); @@ -78,16 +70,17 @@ void initialize_resources() { // Delete a resource given it's ID. Must be called with resource_lock held. static void delete_resource_locked(size_t rid) { - GPR_ASSERT(resources[rid] != NULL && resources[rid]->raw_pb != NULL && - resources[rid]->name != NULL && n_defined_resources > 0); + GPR_ASSERT(resources[rid] != NULL); gpr_free(resources[rid]->name); - gpr_free(resources[rid]->raw_pb); + gpr_free(resources[rid]->description); + gpr_free(resources[rid]->numerators); + gpr_free(resources[rid]->denominators); gpr_free(resources[rid]); resources[rid] = NULL; n_defined_resources--; } -void shutdown_resources() { +void shutdown_resources(void) { gpr_mu_lock(&resource_lock); for (size_t i = 0; i < n_resources; i++) { if (resources[i] != NULL) { @@ -128,8 +121,13 @@ static bool validate_string(pb_istream_t *stream, const pb_field_t *field, } break; case google_census_Resource_description_tag: - // Description is optional, does not need validating, just skip. - if (!pb_read(stream, NULL, stream->bytes_left)) { + if (stream->bytes_left == 0) { + return true; + } + vresource->description = gpr_malloc(stream->bytes_left + 1); + vresource->description[stream->bytes_left] = '\0'; + if (!pb_read(stream, (uint8_t *)vresource->description, + stream->bytes_left)) { return false; } break; @@ -144,17 +142,47 @@ static bool validate_string(pb_istream_t *stream, const pb_field_t *field, return true; } +// Decode numerators/denominators in a stream. The `count` and `bup` +// (BasicUnit pointer) are pointers to the approriate fields in a resource +// struct. +static bool validate_units_helper(pb_istream_t *stream, int *count, + google_census_Resource_BasicUnit **bup) { + while (stream->bytes_left) { + (*count)++; + // Have to allocate a new array of values. Normal case is 0 or 1, so + // this should normally not be an issue. + google_census_Resource_BasicUnit *new_bup = + gpr_malloc((size_t)*count * sizeof(google_census_Resource_BasicUnit)); + if (*count != 1) { + memcpy(new_bup, *bup, + (size_t)(*count - 1) * sizeof(google_census_Resource_BasicUnit)); + gpr_free(*bup); + } + *bup = new_bup; + if (!pb_decode_varint(stream, (uint64_t *)(*bup + *count - 1))) { + return false; + } + } + return true; +} + // Validate units field of a Resource proto. static bool validate_units(pb_istream_t *stream, const pb_field_t *field, void **arg) { - if (field->tag == google_census_Resource_MeasurementUnit_numerator_tag) { - *(bool *)*arg = true; // has_numerator = true. - } - while (stream->bytes_left) { - uint64_t value; - if (!pb_decode_varint(stream, &value)) { + resource *vresource = (resource *)(*arg); + switch (field->tag) { + case google_census_Resource_MeasurementUnit_numerator_tag: + return validate_units_helper(stream, &vresource->n_numerators, + &vresource->numerators); + break; + case google_census_Resource_MeasurementUnit_denominator_tag: + return validate_units_helper(stream, &vresource->n_denominators, + &vresource->denominators); + break; + default: + gpr_log(GPR_ERROR, "Unknown field type."); return false; - } + break; } return true; } @@ -170,10 +198,11 @@ static bool validate_resource_pb(const uint8_t *resource_pb, vresource.name.funcs.decode = &validate_string; vresource.name.arg = resources[id]; vresource.description.funcs.decode = &validate_string; + vresource.description.arg = resources[id]; vresource.unit.numerator.funcs.decode = &validate_units; - bool has_numerator = false; - vresource.unit.numerator.arg = &has_numerator; + vresource.unit.numerator.arg = resources[id]; vresource.unit.denominator.funcs.decode = &validate_units; + vresource.unit.denominator.arg = resources[id]; pb_istream_t stream = pb_istream_from_buffer((uint8_t *)resource_pb, resource_pb_size); @@ -181,17 +210,15 @@ static bool validate_resource_pb(const uint8_t *resource_pb, return false; } // A Resource must have a name, a unit, with at least one numerator. - return (resources[id]->name != NULL && vresource.has_unit && has_numerator); + return (resources[id]->name != NULL && vresource.has_unit && + resources[id]->n_numerators > 0); } -int32_t census_define_resource(const uint8_t *resource_pb, - size_t resource_pb_size) { +// Allocate a blank resource, and return associated ID. Must be called with +// resource_lock held. +size_t allocate_resource(void) { // use next_id to optimize expected placement of next new resource. static size_t next_id = 0; - if (resource_pb == NULL) { - return -1; - } - gpr_mu_lock(&resource_lock); size_t id = n_resources; // resource ID - initialize to invalid value. // Expand resources if needed. if (n_resources == n_defined_resources) { @@ -212,22 +239,25 @@ int32_t census_define_resource(const uint8_t *resource_pb, } GPR_ASSERT(id < n_resources && resources[id] == NULL); resources[id] = gpr_malloc(sizeof(resource)); - resources[id]->name = NULL; + memset(resources[id], 0, sizeof(resource)); + n_defined_resources++; + next_id = (id + 1) % n_resources; + return id; +} + +int32_t census_define_resource(const uint8_t *resource_pb, + size_t resource_pb_size) { + if (resource_pb == NULL) { + return -1; + } + gpr_mu_lock(&resource_lock); + size_t id = allocate_resource(); // Validate pb, extract name. if (!validate_resource_pb(resource_pb, resource_pb_size, id)) { - if (resources[id]->name != NULL) { - gpr_free(resources[id]->name); - } - gpr_free(resources[id]); - resources[id] = NULL; + delete_resource_locked(id); gpr_mu_unlock(&resource_lock); return -1; } - next_id = (id + 1) % n_resources; - // Make copy of raw proto, and return. - resources[id]->raw_pb = gpr_malloc(resource_pb_size); - memcpy(resources[id]->raw_pb, resource_pb, resource_pb_size); - n_defined_resources++; gpr_mu_unlock(&resource_lock); return (int32_t)id; } @@ -253,3 +283,31 @@ int32_t census_resource_id(const char *name) { gpr_mu_unlock(&resource_lock); return -1; } + +int32_t define_resource(const resource *base) { + GPR_ASSERT(base != NULL && base->name != NULL && base->n_numerators > 0 && + base->numerators != NULL); + gpr_mu_lock(&resource_lock); + size_t id = allocate_resource(); + size_t len = strlen(base->name) + 1; + resources[id]->name = gpr_malloc(len); + memcpy(resources[id]->name, base->name, len); + if (base->description) { + len = strlen(base->description); + resources[id]->description = gpr_malloc(len); + memcpy(resources[id]->description, base->description, len); + } + resources[id]->prefix = base->prefix; + resources[id]->n_numerators = base->n_numerators; + len = (size_t)base->n_numerators * sizeof(*base->numerators); + resources[id]->numerators = gpr_malloc(len); + memcpy(resources[id]->numerators, base->numerators, len); + resources[id]->n_denominators = base->n_denominators; + if (base->n_denominators != 0) { + len = (size_t)base->n_denominators * sizeof(*base->denominators); + resources[id]->denominators = gpr_malloc(len); + memcpy(resources[id]->denominators, base->denominators, len); + } + gpr_mu_unlock(&resource_lock); + return (int32_t)id; +} |